What are the stainless steel materials? What are the model names of stainless steel materials?

Stainless steel is short for stainless steel, this kind of steel is resistant to air, steam, water and other weak corrosive media, some also resistant to chemical corrosion medium corrosion. The term "stainless steel" does not simply refer to a kind of stainless steel, each stainless steel has good performance in its specific field of application. Common stainless steel categories are martensitic steel, ferritic steel, austenitic steel, duplex stainless steel, etc., each category has a variety of different stainless steel models. This issue lists all kinds of stainless steel material model name.

Food grade stainless steel

Food grade stainless steel refers to the stainless steel material in accordance with the provisions of the National Standard of the People's Republic of China/Sanitary Standard for Stainless Steel Tableware Containers GB 9684-88. Unqualified stainless steel for food, may precipitate toxic elements, choose carefully. What kinds of food grade stainless steel are there? Food grade stainless steel mainly has 304 stainless steel and 316 stainless steel.

304 stainless steel is widely used in industry, furniture decoration industry and food and medical industry. ordinary 304 stainless steel and food grade 304 stainless steel is not the same, only the logo "food grade -GB9684" for food is safer. Similarly, 316 stainless steel and food grade 316 stainless steel is not the same. At the time of purchase, the regular goods will be on the surface and the inner wall of the product will be marked with the "food grade 304 stainless steel" logo, and the logo is "food grade - GB9684" products, higher safety.

304, 316 stainless steel which good?

Compared with 304 stainless steel, 316 stainless steel has stronger corrosion resistance. 304 stainless steel is suitable for general water, control gas, wine, milk, CIP cleaning liquid and other corrosive small or do not contact the material occasions. 316 stainless steel can be used for pure water, distilled water, medicine, sauce, vinegar and other health requirements, medium corrosion performance of the occasion. 316 stainless steel material is more expensive, used in high-end equipment, such as aerospace, food machinery and other fields. Food grade stainless steel for daily use, most common is food grade 304 stainless steel.

Chromium-nickel austenitic stainless steel type

304 stainless steel

The Chinese grade of 304 stainless steel is 06Cr19Ni10, the American grade is ASTM 304 and the Japanese grade is SUS 304. 304 steel must contain at least 18% chromium and at least 8% nickel. It is a common kind of steel, corrosion resistance, heat resistance, low temperature strength, good mechanical properties, deep stamping, bending and other normal temperature processing performance is better, after heat treatment will not harden.

Application: Household goods, automobile parts, medical equipment, building materials, chemical, food industry, agriculture, Marine parts.

309 Stainless Steel

Steel mills produced more is 309S stainless steel, corrosion resistance, high temperature resistance performance is better. 309 stainless steel corresponding to the Chinese brand is 0Cr23Ni13, the American brand is ASTM 309S, the Japanese brand is SUS 309.

Application: boiler, chemical industry and so on.

316 stainless steel

The Chinese version of the 316L is 022Cr17Ni12Mo2, the American version is AISI 316L, and the Japanese version is SUS 316L. It contains 2 ~ 3% Mo element, and the American standard stipulates that the nickel content of 316L is 10 ~ 14%. This stainless steel has excellent corrosion resistance, high temperature strength is particularly good, suitable for use in harsh conditions, work hardening performance is good.

Use:

Seawater equipment, chemical, paper, fuel, oxalic acid, fertilizer production equipment, photography, food industry, coastal facilities.

More types

301 stainless steel, 302 stainless steel, 303 stainless steel, 305 stainless steel, 308 stainless steel, 310 stainless steel, 314 stainless steel, 317 stainless steel, 321 stainless steel, 330 stainless steel, 332 stainless steel.

Chrome-nickel-manganese Austenitic Stainless Steel (200 series)

200 Series stainless steel introduction

The biggest advantage of 200 series stainless steel is relative to 300 series stainless steel price is cheap. This kind of steel is widely used in building decoration, kitchen utensils, health equipment and appliances, household appliances, transportation and industrial equipment and parts are widely used. But compared with 304, 200 stainless steel corrosion resistance is worse, processing is far less than 304 stainless steel. Whether 200 series stainless steel can be used for food is controversial, it is necessary to be careful when choosing.

What are 200 stainless steel

201 Stainless Steel

201 stainless steel in China is 1Cr17Mn6Ni5N, which belongs to high manganese and low nickel stainless steel with low nickel content and poor corrosion resistance.

Uses: All kinds of tabletop, countertop, kitchenware, as well as outdoor decoration engineering and urban decoration industry and high-end household products.

202 Stainless Steel

202 Stainless steel in China is 1Cr18Mn8Ni5N, in low nickel high manganese stainless steel, nickel content, manganese content about 8%, is nickel stainless steel.

Uses: Architectural decoration, municipal engineering, highway guardrail, hotel facilities, shopping malls, glass handrails, public facilities.

Fake 200 series

The fake and shoddy 200 series stainless steel products have serious defects in the design of chemical composition, corrosion resistance and other properties are not up to standard, Cr content is set at 16% ~ 18%, but the Cr content of these products is less than 15%; Nickel content in the national and international standards of 3.5 to 5.5 percent, such products are less than 1 percent nickel content. And sulfur, copper and other elements content is high, especially harmful to human health elements manganese, phosphorus content is higher. At the same time, once manganese enters the human body, it can cause different degrees of damage to the nervous, immune, endocrine, reproductive and other systems.

Ferritic Stainless Steel (400 series)

Introduction to ferritic stainless steel

Ferritic stainless steel contains 15%-30% chromium and has a body - centered cubic crystal structure. This kind of steel has the characteristics of large thermal conductivity, small expansion coefficient, good oxidation resistance, excellent stress corrosion resistance and so on. It is mostly used in the manufacture of parts resistant to atmospheric, water vapor, water and oxidizing acid corrosion.

Ferritic stainless steel type

409 stainless steel

409 stainless steel China brand 0Cr11Ti, 409L China brand 00Cr11Ti. 409 stainless steel is a ferritic stainless steel commonly used in machinery, construction and other engineering. Due to the existence of austenite grains, its mechanical properties are greatly improved. Moreover, due to the addition of a lot of alloy elements, the strength and hardness are also greatly improved.

Purpose: Automobile exhaust pipe.

430 stainless steel

430 stainless steel Chinese grade 10Cr17. 430 stainless steel is a general steel with good corrosion resistance, good thermal conductivity than austenite, thermal expansion coefficient is smaller than austenite, heat resistance fatigue, add stabilizing element titanium, good mechanical properties of weld parts.

Uses: building decoration, fuel burner parts, household appliances, household appliance parts.

More types

429 stainless steel 434 stainless steel 436 stainless steel 439 stainless steel 442 stainless steel 443 stainless steel 446 stainless steel

Martensitic Stainless Steel (400 series)

Introduction to martensitic stainless steel

Martensitic stainless steel is a kind of hardening stainless steel, high hardness after quenching, different tempering temperature has different combination of strength and toughness, mainly used in steam turbine blades, tableware, surgical instruments. According to the difference of chemical composition, martensitic stainless steel can be divided into martensitic chromium steel and martensitic chromium nickel steel two types.

Martensitic stainless steel type

410 stainless steel

410 stainless steel has good corrosion resistance, mechanical properties, carbon 0.15%, chromium 13%.

Uses: Blade type, valve type.

420 stainless steel

420 stainless steel has certain wear resistance and corrosion resistance, high hardness, its price is a lower class of stainless steel ball, suitable for the ordinary requirements of stainless steel in the working environment.

Uses: All kinds of precision machinery, bearings, electrical, equipment, instruments, meters, transportation vehicles, household appliances.

More types

414 stainless Steel, 416 stainless steel, 416(Se), 422 stainless steel, 440A stainless steel, 440B stainless steel, 440C stainless steel

Duplex stainless steel

Introduction to duplex stainless steel

Duplex stainless steel, DSS for short, refers to ferrite and austenite accounted for about 50%, refers to ferrite and austenite accounted for about 50%, generally less phase content also needs to reach at least 30% of stainless steel. This kind of steel has the characteristics of austenitic and ferritic stainless steel, compared with ferritic, plasticity, toughness is higher, no room temperature brittleness, intercrystalline corrosion resistance and welding performance are significantly improved, but also maintain the ferritic stainless steel 475℃ brittleness and high thermal conductivity, with the characteristics of superplasticity. Suitable for oil refining, chemical fertilizer, paper making, petroleum, chemical industry and other seawater resistant high temperature concentrated nitric acid heat exchanger and cold shower and devices.

Common classification of duplex stainless steel

Low alloy type

UNS S32304 (23Cr-4Ni-0.1N), free of molybdenum, with a PREN value of 24-25, can be used in place of AISI304 or 316 in stress corrosion resistance.

Medium alloy type

The representative brand is UNS S31803 (22Cr-5Ni-3Mo-0.15N), the PREN value is 32-33, and its corrosion resistance is between AISI 316L and 6%Mo+N austenitic stainless steel.

High alloy type

Generally containing 25%Cr, also contains molybdenum and nitrogen, some also contain copper and tungsten, the standard grade UNSS32550 (25Cr-6Ni-3Mo-2Cu-0.2N), PREN value 38-39, this kind of steel corrosion resistance is higher than 22%Cr duplex stainless steel.

Super duplex stainless steel type

Standard UNS S32750 (25Cr-7Ni-3.7Mo-0.3N) containing high molybdenum and nitrogen, some also containing tungsten and copper, PREN value is greater than 40, can be applied to harsh medium conditions, has good corrosion resistance and mechanical properties, comparable to super austenitic stainless steel.