What Are The Stainless Steel Specification Types?

Stainless steel, does not simply refer to one type of stainless steel, but to more than one hundred types of industrial stainless steel, each of which performs in its specific area of application.

Specific specifications and models, according to the state of organization can be divided into the following types:

1, ferritic stainless steel

Including 409, 410L, 430, 430Ti, 433, 434, 436, 439, 441, 444, 446 and so on.

Chromium content between 15% and 30%, the higher the chromium content, corrosion resistance, oxidation resistance, toughness will be the stronger, at the same time, it can also be very good resistance to the environment, salt water and other solutions of erosion, but relatively speaking, its mechanical properties and process performance is a little weak.

Because of such characteristics, ferritic stainless steel is often used for oxidation-resistant steel, acid-resistant food factory equipment.

2、Austenitic stainless steel

Including 200, 300 series.

Chromium content greater than 18%, nickel content of 8%, while containing a small amount of molybdenum, titanium, nitrogen and other elements. This stainless steel weldability, plasticity, toughness are good, can resist a variety of media corrosion, so it can be used to make acid-resistant chemical piping, equipment, etc., the overall performance is relatively good.

3, austenitic - ferritic duplex stainless steel

Including S31200, S32304, S32750 and so on.

As the name suggests, this type of stainless steel austenitic and ferritic organizations account for half, so it abandoned some of the shortcomings of the two, both the advantages of the two stainless steel. Compared with the simple ferritic stainless steel, plasticity, weldability, toughness are higher, compared with the simple austenitic stainless steel, strength, corrosion resistance is stronger.

4, martensitic stainless steel

Including 403, 410, 416, 416 (Se), 420, 431, 440A, 440B, 440C and so on.

This stainless steel has a high carbon content, so the strength, hardness, wear resistance is very strong, but plasticity, weldability, corrosion resistance is relatively poor.

It can be used for parts with high mechanical requirements, such as turbine blades, hydraulic valves and so on.

5、Stainless steel plate and strip for pressurized equipment

Including S30408, S31603 and so on.

This is a kind of stainless steel specially used for pressure vessels, size, technology, quality and so on have clear requirements, mainly used for some sanitary equipment.