1 304L: Low-carbon products are more corrosion-resistant and easy to heat-treat, but their mechanical properties are poor, so they are suitable for welding and products that are not easy to heat-treat.

2.309S: contains a lot of chromium and nickel, so it has good heat resistance and oxidation resistance. It is used in heat exchangers, boiler parts and injection engines.

3.3 16: It has good chloride corrosion resistance and is mainly used in food industry, watch accessories, pharmaceutical industry and surgical instruments.

4.3 16L: Low carbon makes it more corrosion resistant and easy to heat treat. It is used for chemical treatment equipment, nuclear power generators and refrigerant storage.

5, 440: High-strength cutting tool steel, with slightly higher carbon content, can obtain higher yield strength after proper heat treatment, and the hardness can reach 58HRC, which is one of the hardest stainless steels. The most common application example is "shaving blade".

Extended data

Main types of stainless steel:

Stainless steel is usually divided into martensite steel, ferrite steel, austenite steel, austenite-ferrite (duplex) stainless steel and precipitation hardening stainless steel. In addition, it can also be divided into chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel.

1, ferritic stainless steel

Chromium 15% ~ 30%. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its chloride stress corrosion resistance is better than other types of stainless steel, including Crl7, Cr 17Mo2Ti, Cr25, Cr25Mo3Ti and Cr28.

2, austenitic stainless steel

It contains more than 18% chromium, about 8% nickel and a few elements such as molybdenum, titanium and nitrogen. This kind of steel contains a lot of nickel and chromium, which makes it austenitic at room temperature. This steel has good plasticity, toughness, weldability, corrosion resistance, and no magnetism or weak magnetism.

3. Austenite-ferrite duplex stainless steel

It has the advantages of austenitic and ferritic stainless steel and is superplastic. About half austenite and half ferrite stainless steel. This steel has the characteristics of both austenitic and ferritic stainless steel. Compared with ferrite, it has higher plasticity and toughness, no brittleness at room temperature, and significantly improved intergranular corrosion resistance and weldability.

4. Stainless steel plate and steel strip for pressure equipment

Stainless steel for pressure vessels, commonly used brands are 06cr19ni10,022cr17ni12mo2, and numerical codes are: S30408, S3 1603, etc. Mainly used in food machinery, pharmaceutical machinery and other sanitary equipment. ?

Baidu encyclopedia-stainless steel