What is food steel

Food grade stainless steel

Food grade stainless steel 02/15/2019 Steel, called food grade stainless steel, is a number of grades that have increased corrosion resistance. In state standards they are not identified as a separate category, therefore, when choosing a food metal, it is advisable to know its labeling. To buy a food-grade stainless steel sheet, you need to focus on the required anti-corrosion indicators.

Having such information, you can find out the metal markings using a special reference book.
There are other ways to “calculate” food grade steel:
Using vinegar. To do this, you will have to stock up on a metal sample in advance, place it in 2% vinegar and wait for the reaction. If the surface has not darkened within a few hours, most likely the steel is actually food grade.

By placing it in a work environment.
As in the previous description, a fragment of metal is placed in a liquid for storage or transportation of which steel or a product made from it is purchased. After a few hours, the results are assessed. Using a magnet. There is an opinion that a magnet does not stick to a sheet or pipe made of food-grade stainless steel.

Alas, this method does not always work, since certain grades of corrosion-resistant steel are magnetized.
Using sandpaper and copper sulfate. This method is suitable for those who are not sure about the metal from which steel cookware is made. You should rub the pan with sandpaper, and then drop a saturated solution of copper sulfate onto this place.

If a red film appears, the product can be safely thrown away: it is not made of food steel.
Using a spectrometer. This is the fastest, most reliable and inexpensive option. As a rule, metal dealers always have a portable device. If it is not possible to use the above methods, you should consult with the metal seller or a representative of the manufacturing company.

This will help you avoid making a mistake and buy the right grade of steel. And, by the way, the better the buyer’s understanding of the prospects for using stainless steel, the greater the chance of choosing a material with the desired characteristics.

What is the difference between food grade stainless steel and technical stainless steel?

The main difference is that food-grade stainless steel of any brand is an alloy, one-quarter consisting of chromium. Thanks to its presence, the metal plane in direct contact with the aggressive food composition is covered with an oxide film that prevents corrosion. In addition to chromium, metals such as nickel and others are added to stainless steel intended for food production, which further increase the anti-corrosion ability of the material.

Where is food grade steel used?

Food grade stainless steel serves as a valuable material for the manufacture of:
all kinds of containers;
special pipes and their systems;
equipment; pots, forks, spoons and other products that you cannot do without in everyday life, cafes and restaurants. The use of special food-grade steel is advisable where the metal will be exposed for a long time or constantly to the usual food liquids, high temperatures and chemically aggressive mixtures.

The special quality of steel makes such products resistant to rust, and also prevents chemical interaction between the metal container and its contents. Technical stainless steel is not in all cases capable of resisting corrosion under the conditions created during storage, processing, and transportation of certain food compounds. This is despite the fact that it is considered resistant to corrosion.

Reflecting on the problem, technologists have developed special food-grade stainless steel grades, which are in great demand today.

Advantages of food grade stainless steel

The advantages of such alloys include such qualities as:
strict compliance with hygienic and toxicological safety standards;
external beauty of products;
ease of maintenance;
environmental friendliness;
high resistance to wear and damage;
immunity to the influence of aggressive environments;
compliance with the permissible parameters for the dissolution of metals in the composition representing the working environment. You don’t have to be an expert to appreciate the many benefits of food-grade stainless steel.

Each housewife will confirm that:

Dishes made from this alloy are convenient, beautiful and last a long time.
There is no shame in buying a set made of food-grade stainless steel, even as a gift; Stainless steel baking sheets and body elements of electric and gas stoves are easy to clean.
For decades now, corrosion-resistant steel has been widely used in the decoration of residential and office premises and the design of household appliances.
Each grade of food steel has its own set of properties that determine its scope of application. Thus, for equipment that will come into contact with aggressive liquids, alloys with the maximum degree of oxidation resistance are used, and for dinnerware, “lighter” options are used.

Today, food grade stainless steel is among the most popular:

AISI 304 (grade 08Х18Н10).
This is a relatively inexpensive steel used for equipment in chemical and other industries. Food-grade 304 stainless steel is acid-resistant and can, albeit briefly, withstand temperatures of up to 900 degrees Celsius. AISI 409 (grade 08X13).
Dishes are made from it, as well as numerous cutlery, which, thanks to the material, retain their excellent appearance and integrity even after many years of use. AISI 420 (grade 20Х13–40Х13). It is this type of steel that sinks are often made from, both home and industrial.
They tolerate contact well with cold and hot water, as well as cleaning solutions. AISI 410 (grade 12X13).
This steel has ideal characteristics from the point of view of producing equipment for winemaking needs. Food grade stainless steel AISI 410 has excellent heat resistance, provided that the working environment has low levels of aggressiveness. In addition, she is not afraid of bumps and falls. AISI 430 (08X17). It is used in the manufacture of dishes intended for long-term heat treatment of food. Pans made of this steel perfectly retain their shape and strength, and also conduct heat well.

AISI 439 stainless steel (grade 08X17T) deserves special attention, from which various sanitary products, as well as washing machines and refrigerators, are made. A table for food production made of such stainless steel will serve for a long time, without the formation of rust or deformation. AISI 439 alloy has a reputation as a universal alloy, as it is suitable for use in different conditions.

You can buy food-grade stainless steel at retail or wholesale from companies that sell metal.
These can be either direct manufacturers or intermediaries. The price of a sheet of food grade stainless steel or a product made from it will depend on the characteristics of the metal and the presence of alloying elements in it.
In a word, from the brand; on the thickness of the food grade stainless steel sheet;
depending on the type of surface treatment.

As for the price of food grade stainless steel pipes, it will also depend on the length of the piece, since these products are sold by linear meters.

Food grade stainless steel is a valuable material for the manufacture of products and equipment in contact with aggressive environments, such as wine, milk, and alcohol. The value of each grade of such metal is determined by its properties, application options, as well as the presence of expensive components in the alloy.

Source: http://spb.mvsteel.ru/articles/pishevaya-nerjaweika/

Food grade stainless steel: grade and application features

Food grade stainless steel, as stainless steel is abbreviated to be used for the production of products that come into contact with food and liquids during their operation, is a material with a special chemical composition. The properties of this metal, represented by various grades, determine a fairly wide scope of its application.

Stainless steel sheet grade 08Х18Н10 (AISI 304) polished in film

Areas of application

Particularly high demands are placed on the materials used in the manufacture of various products, containers, containers, pipelines and equipment used in the food industry. This is explained by the fact that such materials, during operation, not only constantly come into contact with liquid and moist environments, but are also exposed to high temperatures, as well as chemically aggressive substances.

Conventional stainless steel is not always able to withstand the conditions in which food products are stored, transported and processed, despite the fact that it is highly resistant to corrosion. That is why specialists have developed special stainless steels classified as food grade.

Food manufacturers use stainless steel pipes, which are connected with appropriate fittings that meet the requirements of the DIN 11850 standard.

Food grade stainless steel has a number of advantages, among which the following are worth highlighting:

• compliance with strict hygienic and toxicological requirements;
• aesthetically attractive appearance;
• ease of maintenance;
• environmental Safety;
• strength and wear resistance;
• exceptional resistance to various types of aggressive environments;
• compliance with the requirements for the dissolution of heavy metals in the working environment.

Not only a specialist, but also any housewife knows that the most convenient to care for and beautiful are those pots and cutlery that are made of stainless steel. In addition, sheets of this metal are used to make baking trays for ovens, stove bodies, refrigerators and other household appliances. Recently, the scope of application of food grade stainless steel has been constantly expanding.

In any kitchen, food-grade stainless steel is present in abundance: from cutlery to finishing furniture facades

Stainless steel is an almost irreplaceable material used for the production of various equipment and elements of equipment for enterprises dealing with the production, processing and storage of food products and liquids. In particular, this metal is used to produce containers of various volumes, pipes, trays, and elements of technical devices used to grind food products, mix them, sort them, and heat treat them.

Differences from conventional stainless steel

Stainless steels include alloys whose chemical composition contains a significant amount (up to 27%) of chromium. This element contributes to the formation of an oxide film, which provides stainless steel with high corrosion resistance.

Types of stainless steels regarding their chromium content

In order to provide stainless steel with the required performance characteristics, in addition to chromium, other chemical elements are introduced into its composition - nickel, molybdenum, titanium, etc.

Thus, if stainless steel products, which contain 13–17% chromium, can be successfully used only in slightly aggressive environments, then steel alloys with a high content of this element (over 17%), as well as with nickel and molybdenum, are already able to withstand the effects of solutions salts and even more aggressive environments.

Since there is no separate regulatory document (GOST) for food grade stainless steel, it is quite difficult to distinguish it from technical steel.

Theoretically, any grade of stainless steel can be used for the manufacture of products in contact with food or liquids. The corrosion resistance of such products, no matter what grade of stainless steel they are made from, depends not only on the chemical composition of the manufacturing material, but also on operating conditions.

Both the production and the process of storing and transporting food products are associated with conditions under which materials in contact with such products are constantly exposed to aggressive environments. Depending on the type and duration of exposure to the latter, various brands of stainless steel are classified as food grade.

So, if a container, pipeline or equipment elements are in contact with food products for a very short time, then technical stainless steel can be used for their manufacture. The situation is completely different with the choice of steel for the manufacture of products for various purposes that will be in constant contact with food products and liquids.

For such purposes, completely different brands of stainless steel should be used. Obviously, different brands of stainless steel alloys may fall into the food category.

Most popular brands

When choosing a brand of stainless steel for the manufacture of a particular product, experts first of all evaluate how long its surface will be in contact with food products or liquids.

Thus, for the production of products used in the food industry, which during their operation will be constantly in contact with solid products or liquids, it is necessary to select grades of steel alloys with maximum corrosion resistance.

At the same time, items that come into contact with food for a fairly short time (for example, cutlery) can be made from stainless steel, which is less resistant to aggressive environments.

International standards for food grade steels

One of the most common stainless steel alloys used in the modern food industry is steel 08Х18Н10 (AISI-304 encoding).

This material is low-cost and can be successfully used for the production of products that, during their operation, will not come into contact with solutions containing caustic soda and sulfamic acids.

The high popularity of this grade of steel alloy, which is actively used in the food industry, is ensured by such characteristics as:

• high strength, demonstrated at low heating temperatures;
• the ability to perform such a technological operation as electric polishing;
• good weldability;
• high resistance to phenomena such as intergranular corrosion.

Technical properties of steel 08Х18Н10

Another popular grade of stainless steel, which is actively used, in particular, for the production of cutlery and kitchenware, is steel 08Х13 (in the international classification - AISI 409). Products made from this steel, characterized by a high degree of adaptation to operating conditions, surround us in our kitchens.

For the production of both household and industrial sinks, as well as dishes and special containers for thermal and hygienic processing of food products, stainless steel grades 20Х13–40Х13 (AISI 420) are used. Along with high wear resistance and ductility, steels of these grades perfectly resist even high-temperature corrosion.

A branch of the food industry, which requires materials with special properties and especially high corrosion resistance, is winemaking, alcohol production, as well as areas related to the processing of waste from such industries. The grade of stainless steel, products from which perform well in such conditions, is 12X13 (AISI 410).

Technical parameters of steel 12Х13

From such steel, which is distinguished by exceptional corrosion resistance, high heat resistance in conditions of exposure to mildly aggressive environments, as well as increased impact strength, various fittings and communications elements for food production, tanks and other types of containers are made, where liquid aggressive media are stored for a long time.

For the manufacture of utensils and production containers in which food products and liquids must be subjected to heat treatment, stainless steel alloy grade 08Х17 (AISI 430) is used. The distinctive features of this alloy include:

• high corrosion resistance when interacting with environments containing sulfur in their chemical composition;
• optimal combination of high strength and ductility;
• high thermal conductivity;
• decent mechanical characteristics.

A variety of containers for storing and processing food liquids are made from stainless alloy 08Х17

Among the universal steel alloys of the stainless category, from which various plumbing fixtures, washing machines, refrigerators and other products are produced, is steel grade 08Х17Т (AISI 439). Due to its characteristics, stainless steel of this brand can be successfully used for the production of products for various purposes, operated in conditions of high humidity and constant exposure to aggressive environments.

All stainless steel alloys mentioned above are actively used for the production of products intended for:

• food preservation performed at home;
• storage of food products, including dairy products;
• heat treatment of food products, preparation of first and second courses from them.

Products made from food-grade stainless steel have long taken their rightful place in our kitchens, which is explained by the truly unique characteristics of this material.

Source: http://met-all.org/stal/pishhevaya-nerzhavejka-marka-stali.html

Food grade stainless steels. Aspects of choice

The manufacture of containers or equipment that interacts with food products requires careful selection of materials. Storage, preparation, sanitary processing, and transportation of food are usually associated with conditions in which even stainless steel can corrode and negatively affect the quality of food. The so-called food grade stainless steel helps solve the problem.

Food grade stainless steel is a general name for grades of stainless steel that exhibit high corrosion resistance. There is no such concept in GOST standards, which is why food grade stainless steel often has to be chosen based on scattered information and reviews. What are food grade stainless steels and how to make the right choice?

Food grade stainless steel

Stainless steels are currently considered an almost indispensable material for creating food processing equipment.

The grades of stainless steel approved for contact with food products were determined mainly based on the experience of wine production, which is carried out using the most corrosive processes and technologies.

As a result, it turned out that when choosing a brand of food-grade stainless steel, one should take into account the duration of its contact with the food product. The longer the contact, the higher the corrosion resistance required.

Currently, stainless steel grades AISI 304, AISI 304L, AISI 430, AISI316, AISI 316L, AISI 316Ti, AISI 321 are widely used for the food industry. All of them are alloyed stainless steels.

If you need food grade stainless steel, the brand can be any from this list, but you should know that AISI 304, AISI 430, AISI 316 do not contain stabilizing titanium. This reduces their corrosion resistance and makes them sensitive to mechanical, thermal and chemical influences.

They can be used for short contact with food products under gentle operating conditions.

Features of stainless steel for the food industry

Food manufacturers most actively use stainless steel pipes. They must meet the requirements of the DIN 11850 standard, which determines the composition of the steel and the quality of the weld. Stainless steel pipes fully meet the increased requirements for hygiene and environmental friendliness of materials used in the production of equipment for the food industry and public catering. They are made from AISI 304 and AISI 316L steels, which exhibit the following properties:

• high corrosion resistance along the entire length of the pipe and in areas of welded joints;
• resistance to chemically aggressive environments;
• wear resistance;
• environmental safety and non-toxicity;
• compliance with migration (dissolution) standards of heavy metals in the working environment;
• maintaining smoothness parameters throughout the entire service life, which facilitates cleaning and maintenance of the equipment.

In food production, hot solutions of sulfamic acid or caustic soda are often used to clean equipment. In these conditions, it is better to choose AISI 316 stainless steel, which is more resistant to aggressive environments. For domestic conditions and public catering, where the metal does not interact with such solutions, you can use AISI 304 and cheaper AISI 430, AISI 410.

Below, for clarity, the types of stainless steels according to AISI used in food production, their compliance with other standards, including Russian, as well as the permissible applicability of stainless steel in various environments are presented.

Table 1. 1. Translations of international standards for designating the main steels used in food production.

Table 1. 2. (continued) Translations of international standards for designating the main steels used in food production

Table 2. Applicability of stainless steels according to AISI. Corrosion resistance of steels according to AISI in various applications

Price

If you need food-grade stainless steel, the price will be determined by the presence of expensive alloying components in the composition. The quality of surface treatment of the selected products is also important. Equipment for the food industry places higher demands on stainless steel, which is used in more aggressive conditions, and in case of corrosion can harm huge volumes of products. Cheap food grade stainless steel can be used in everyday life and public catering.

How to identify food grade stainless steel?

To determine the composition of food-grade stainless steel and its suitability for corrosion resistance parameters, you can use a guide to stainless steel grades. If you have a sample of stainless steel of an unknown brand, its suitability can be checked by placing it in a two percent vinegar solution or in a working environment for two to three days. Steel can be used if the sample does not darken.

The common belief that food grade stainless steel can be determined using a magnet is erroneous. Among the grades of food grade stainless steel, there are both magnetizable and non-magnetizable steels.

To make your choice, do not hesitate to consult with a specialist from the company where you are going to purchase stainless steel.

The better you understand the food production processes for which you need stainless steel, the better your chances of making the right choice.

Source: https://www.kp.ru/guide/pishchevaja-nerzhaveika.html

Food grade stainless steel: GOST. How to identify food grade stainless steel? What is the difference between food grade stainless steel and technical stainless steel?

Stainless steel is the most popular material from which containers and utensils that come into contact with food are made. Stainless steel has good anti-corrosion properties, durability and low weight. However, it is worth considering that this material is not always resistant to aggressive environments; in this case, special food-grade formulations are used.

Of course, it is best to store food in steel or glass containers, since the foam propylene that is popular today does not meet all the necessary requirements. In addition, its service life is much shorter than that of products made of steel.

Many people are interested in how to distinguish food-grade stainless steel from material that is unsuitable for storing food? To answer this question, it is worth considering the advantages, features and classification of this metal.

GOST and stainless steel grades

If we talk about state standards, they do not stipulate the rules related to stainless steel. This is why experts find it difficult to answer which material is recommended for use in the food industry. In turn, the manufacturers of this stainless metal respond that regardless of its brand, it is suitable for food products.

Do the standards really say nothing about food grade stainless steel? GOST 5632-72 is perhaps the closest regulatory document that can be used when choosing the best alloy for household use. This State Standard refers to grades of high-alloy steel and corrosion-resistant and heat-resistant alloys. Let's take a closer look at this classification.

Austenitic, corrosion-resistant stainless steel is produced under this brand. The European analogue is AISI 304. This material is not magnetic. It is used in all industrial and commercial sectors.

This material has a low price and good quality. It is often used in the food industry, but only on the condition that the metal does not come into contact with caustic soda or sulfamine solutions.

12Х18Н10Т

The European analogue of this brand is AISI 321. This heat-resistant steel is also not magnetic. Stainless steel of this brand is often used in the manufacture of elements of furnace fittings, heat exchangers and exhaust manifolds. The thing is that this steel is suitable for use at high temperatures from 600 to 800 degrees.

08Х13

The European analogue of this material is AISI 409. This steel is widely used in the production of kitchen utensils and cutlery. This food grade stainless steel is most often found in stores. The material gained such popularity due to its high degree of adhesion and ability to adapt to different operating conditions.

This dish can be safely heated or stored in the freezer.

20Х13-40Х13

Steel of this type belongs to the category of composite materials, so it is often used in the manufacture of household and industrial sinks, as well as for the production of utensils for hygienic or thermal processing of food.

The European analogue of this brand is AISI 420. If the cookware bears one of these markings, then you can safely buy it for household use.

This stainless steel does not rust, tolerates sudden changes in temperature, and is also a fairly plastic and wear-resistant material.

12Х13

In Europe, this material is produced with the AISI 410 marking. Steel of this type is more often used in the production of equipment for winemaking, food processing and alcohol production. In addition, this material is characterized by increased heat resistance in mildly aggressive environments.

08Х17

In Europe, this steel is produced under the brand name AISI 430. This stainless steel is indispensable if the food in the cookware is subjected to heat treatment. This type of steel has the highest strength. However, this material quickly deforms in a sulfur environment. At the same time, stainless steel does not rust and can withstand mechanical loads. It is recommended to buy frying pans from this material, since 08X17 is characterized by a high thermal conductivity coefficient.

All other materials are used in special conditions, their cost is much higher. However, not all stainless steel can be safely used for cooking and storing food. In order not to delve into how food-grade stainless steel differs from technical stainless steel, it is much easier to read a few useful recommendations. They will allow you to quickly determine whether a given material is suitable for food. This is useful to know for every consumer concerned about their health.

How to distinguish food grade stainless steel from technical grade?

To determine the composition of the anti-corrosion alloy, as well as the possibility of its use in everyday life, you can write down the brands that were listed above. If such markings are on the utensils, then they are suitable for preparing and storing food.

But sometimes it happens that in front of your eyes is a material of an unknown brand, and the seller insists that this alloy is absolutely environmentally friendly and cannot harm humans. In this case, it is enough to place the metal in a 2% vinegar solution and wait for the reaction. If the shade of the material has changed, it has become dark, then it is better not to use it. The constancy of color indicates that the stainless steel is indeed food grade. It can be used.

There is another method that consumers often use after reading information on how to identify food-grade stainless steel. They use a magnet for this. But it is worth understanding that this method is completely ineffective, since stainless steel can be magnetic or non-magnetic. Accordingly, using a magnet will not help in any way determine whether the material can be used for food.

To choose the best metal, you should study the information about the product and ask the seller for accompanying documents. Any utensils must be manufactured in accordance with certain standards and requirements. If there is no marking on the product, then it is better to refuse such a product. Otherwise, you can purchase low-quality utensils that are dangerous to human health.

Source: https://FB.ru/article/321576/nerjaveyka-pischevaya-gost-kak-opredelit-pischevuyu-nerjaveyku-chem-otlichaetsya-pischevaya-nerjaveyka-ot-tehnicheskoy

How to distinguish food grade stainless steel from technical grade

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When creating products that may come into contact with food and liquids during operation, food grade stainless steel is often used. The properties of this material determine its wide distribution. The main property is related to corrosion resistance. A wide variety of blanks are supplied for sale, most often in the form of sheets.

General characteristics of food steel

The main characteristics of food grade stainless steel are higher than regular ones. This is due to the fact that not every metal can withstand the conditions under which food is transported and stored. That is why, over a long period, developments have been carried out to obtain a material with exceptional performance qualities.

Modern food grade stainless steel is characterized by the following features:

1. Aesthetically attractive appearance. However, it remains practically unchanged over a long period.
2. The differences between food-grade stainless steel and technical stainless steel are that the former is produced in compliance with strict hygienic and toxicological requirements.
3. Environmental Safety. The surface does not interact with the environment.
4. Ease of maintenance. Stainless steel can be cleaned quickly if necessary and does not require special chemicals.
5. The surface film can withstand aggressive influences.

Recently, food grade steel is often used in the manufacture of household products. In addition, sheet material is used for lining the interior of ovens or stoves. High performance characteristics determine that stainless steel can last for a long period.

Food grade stainless steel sheet

A fairly common question is how to distinguish food grade stainless steel from technical grade stainless steel. The category of metals under consideration includes alloys that contain about 27% chromium.

By increasing the concentration of this chemical, an oxide film is formed on the surface, which significantly increases the corrosion resistance of the metal.

How to identify food grade stainless steel? As a rule, the difference lies in the concentration of certain elements in the composition:

1. At a certain concentration of chromium and calcium, the resistance of the surface to water vapor can be increased. At the same time, anti-corrosion properties can be maintained at temperatures up to 1150 °C.
2. The composition may also include nickel, which increases the resistance of the surface to nitric or other acids.
3. Molybdenum increases the resistance of the metal to acetic and sulfuric acid.
4. In some cases, copper is added, due to which the metal becomes more resistant to corrosion and stretching.
5. Silicon protects the material from the action of sulfuric and hydrochloric acid.

It is worth considering that a high concentration of alloying elements can negatively affect the basic mechanical characteristics of the metal. Therefore, when choosing a more suitable stainless steel, the conditions under which it will be used are taken into account.

Popular brands

When choosing the most suitable alloy, attention is paid to how long the product will be in contact with an aggressive environment. Some products can be created from an alloy that is less resistant to corrosion, but still has good strength.

Food grade stainless steel steel grade AISI 304 is the most widely used. This is due to the fact that 08×18N10 is characterized by low cost and high resistance to various chemicals and substances. In addition, the following qualities are taken into account:

1. A good degree of weldability, which simplifies the process of producing various products.
2. High strength and increased machinability with low heat.
3. It is possible to carry out electric polishing to obtain the highest quality surface.
4. High resistance to intercrystalline corrosion. It can significantly reduce the strength of the material and its other qualities.

Another popular brand of food grade stainless steel 08×13 is characterized by universal properties. It is used in the manufacture of various products, including those used in everyday life. A heat treatment container is often created using a 20×13 grade, which is characterized by ductility and increased wear resistance. In addition, when exposed to heat, the surface does not lose its corrosion resistance.

Industries that require metals with increased corrosion resistance include winemaking or alcohol production, and waste recycling. In this case, steel grade 12×13 is used. It is characterized by the following properties:

1. High heat resistance. During operation, stainless steel can heat up to temperatures above 100 °C, due to which the basic properties change.
2. Protection from exposure to mildly aggressive environments.
3. Good toughness

Stainless steel is often used in the manufacture of containers for industrial and household purposes, in which food is heated to high temperatures. The 08×17 brand is suitable for this. This alloy has the following properties:

1. Corrosion resistance at elevated temperatures. Some food-grade stainless steels cannot withstand high heat, resulting in corrosion on the surface.
2. High mechanical properties. The created products can last a long time under various operating conditions.
3. Thermal conductivity. As a rule, heating of the contents occurs from the outside. That is why thermal conductivity is considered the most important parameter.
4. With sufficient strength, high ductility is also maintained.

Chemical composition of food grade stainless steel 20X13

Universal ones are most common in the production of household appliances. This group includes alloy 08×17T, which is most often supplied to production in the form of rolled sheets.

Features of marking and GOSTs

Labeling of food grade stainless steel is carried out in accordance with the established rules in GOST. As a rule, when designating an alloy, the concentration of the main alloyed elements is indicated.

Download GOST 5632-2014

Among the marking features, we note the following points:

1. The first number indicates the concentration of carbon - the main element that determines the strength and hardness of the alloy.
2. Certain symbols are used to designate alloying elements. For each, the concentration is indicated as a percentage.
3. If a number is not placed in front of the symbol, then the concentration of the chemical element is less than one percent.

Food grade stainless steel in industry

In addition, food grade stainless steel (GOST defines sanitary and technical standards) may contain other impurities that are not indicated when labeling. An example is sulfur and phosphorus - both elements are included in the composition of almost all metals, they are harmful impurities, and with an increase in the amount of which the alloy loses its properties.

Source: https://moy-instrument.ru/masteru/kak-otlichit-pishhevuyu-nerzhavejku-ot-tehnicheskoj.html

Food grade stainless steel: steel grade, application, advantages

Food grade stainless steel, as stainless steel is abbreviated to be used for the production of products that come into contact with food and liquids during their operation, is a material with a special chemical composition. The properties of this metal, represented by various grades, determine a fairly wide scope of its application.

Stainless steel sheet grade 08Х18Н10 (AISI 304) polished in film

What is the difference between food grade stainless steel and technical stainless steel?

The difference between these two types is the coating on the surface of the industrial steel and how it is processed. For food grade steel, it is important what kind of surface the food will touch. The surface polished to a mirror shine is typical for the food version of stainless steel; the technical version has a matte surface.

Technical steel differs from food steel in the following ways:

1. Different surface coating.
2. Different levels of surface treatment.

Surface quality and roughness

For the food industry, the surface of the metal is important. AISI provides the following types of surface treatments:

• 1D - hot rolled, pickled and heat treated. The surface has a matte sheen and is slightly rough.
• 2B – cold rolled, pickled, heat treated and tempered. Characterized by a matte surface, high smoothness and gloss with gloss. One of the most common in modern industry.
• BA – cold rolled, using special rolls, followed by bright annealing. Has a mirror surface.
• 4N - polished stainless steel surface in various ways.
• PE - sheet metal has a protective film on one side.

Interesting information: How to identify the difference. If there is a need to test stainless steel, it is necessary to place the sample in a saline or 2% vinegar solution and leave for several days. If the steel has not darkened, it can be used for production. The second method is to sand an area of ​​metal with sandpaper and apply a solution of copper sulfate to this place. The absence of a red film indicates that the alloy belongs to stainless steel grades.

What is food grade stainless steel?

The name speaks for itself: you need steel that will not rust with prolonged or moderate contact with food. Therefore, the dishes must be made from appropriate material. Food grade steel is the best choice, combining availability, reliability and quality.

It is necessary to pay attention to the fact that the concept of “food grade stainless steel” does not officially exist in the state standard and is used only in everyday life.

Food grade stainless steel

Stainless steel is a highly alloyed metal and is therefore resistant to corrosion. Chromium added to the metal allows it to not rust. The amount of alloying additives determines the corrosion resistance. Molybdenum, titanium, and nickel also significantly improve the protective properties of steel. The conditions in which stainless steel is used are decisive for it. In the food industry, equipment is affected by an aggressive environment, and therefore it is important what metal it is made of.

If there is a need to learn about food grade or technical stainless steel, you should conduct an experiment. The material to be tested must be placed in vinegar and kept there for some time. Darkening of the sample indicates that it is technical steel; preservation of the color indicates food grade stainless steel.

What is “technical stainless steel”?

Stainless steel is used in various areas of production. Its cost directly depends on the brand, sheet size, and ability to withstand various environmental influences. Currently, one of the developing areas is the sale of nickel-free steel. Cutting objects, in particular knives, are made from such steel. The steel was called “technical stainless steel”.

Technical stainless steel

12Х18Н10Т grade of steel sheets is in demand and is a product of a domestic manufacturer. Food grade stainless steel is also produced abroad, demonstrating decent quality. In order to determine how much a sheet costs, you need to know its parameters. Stainless steel sheets produced abroad have the following types of surfaces:

• Matte.
• Mirror.
• Sanded.

They are in demand, which is important for the development of production.

Operational Requirements

During the manufacture and use of equipment, steel is exposed to all kinds of influences. There is a danger of changes in the surface structure, which leads to a deterioration in the declared indicators and a decrease in performance characteristics.

Compliance with the following requirements for the production and operation of food grade stainless steel products will extend their life and be safe when preparing any food, in any quantity.

• During design and production, contact of dissimilar metals must be avoided. If such contact is unavoidable, insulating gaskets should be used.
• Products intended for designated industries must be designed and manufactured without narrow, difficult-to-reach cavities. Such defects lead to the retention of various substances and will allow the residues of cleaning and washing chemicals to concentrate. This fact explains why welds must be butt welds. Overlapping connections of elements are strictly prohibited.
• If there is no urgent need, minimize the time of interaction of steel with high-temperature concentrates that contain sodium chloride, solutions containing acids, even at low temperatures, disinfecting and cleaning chemicals based on chlorine.
• Avoid food drying on metal surfaces, regardless of the nature of the food. Even neutral food can turn sour and acids will appear that destroy the surface.

From the information presented on this page, we can conclude that before choosing a specific grade of stainless steel for the manufacture of food industry equipment, it is necessary to conduct research and examination of the sample under conditions close to those in which it will have to be used.

Selection of popular stainless steel grades

For use in everyday life and in production, choose stainless steel, which will be in close contact with food, and therefore must be of high quality. Special alloys are used to make equipment that is not susceptible to any external influences. The most popular and cheapest grade of stainless steel is 08Х18Н10 (AISI coding – 304). This alloy is excellent for use in the food industry and catering plants.

08Х18Н10

Food grade stainless steel

When creating products that may come into contact with food and liquids during operation, food grade stainless steel is often used. The properties of this material determine its wide distribution. The main property is related to corrosion resistance. A wide variety of blanks are supplied for sale, most often in the form of sheets.

Food grade stainless steel

What is the difference between food grade stainless steel and technical stainless steel?

Stainless steel or in common parlance “stainless steel” is used by people for various purposes, because it is a metal often used in everyday life. Reasonable price and good quality have made this type of product popular among the population.

Stainless steel products are the main attributes of everyday life and have entered the life of every person seriously and for a long time. Stainless steel is used not only in everyday life, but also in production.

It’s safe to say that food-grade and regular stainless steel is an important element of human life.

Food grade stainless steel: history and time of appearance, description and properties, popular brands and scope of application - Machine

When creating products that may come into contact with food and liquids during operation, food grade stainless steel is often used. The properties of this material determine its wide distribution. The main property is related to corrosion resistance. A wide variety of blanks are supplied for sale, most often in the form of sheets.

Food grade stainless steel