Stainless steel has resistance to air, steam, water and other weak corrosive medium and acid - base salinization corrosive medium.

Stainless steel in the industrial and household use of more, especially in the industrial field of important industries.

Stainless steel and stainless steel classification will be introduced below.

A.What stainless steel material

1. Common stainless steel materials are :201,202,301,303,304, 304L316, 316L, 321, 310S, 401,409, 410,420J1,420J2, 430, 439,443, 444, etc.

2.Other Stainless steel Materials :200(Austenitic stainless steel), 300(Austenitic stainless steel), 309.400,408,416,440,500 and 600, etc.

B.Classification of stainless steel materials

1, According to the main chemical composition can be divided into chromium stainless steel, chromium nickel stainless steel, chromium manganese nitrogen stainless steel, chromium nickel molybdenum stainless steel and ultra-low carbon stainless steel, high molybdenum stainless steel, high purity stainless steel;

2, According to the performance characteristics of steel classification, such as nitric acid resistant stainless steel (nitric acid class), sulfuric acid resistant stainless steel, pitting corrosion resistant stainless steel, stress resistant stainless steel, high strength stainless steel.

3. According to the functional characteristics of steels, such as low-temperature stainless steel, non-magnetic stainless steel, free-cutting stainless steel, superplastic stainless steel, etc.

 4. According to the metallography, it is classified as: ferritic (F) stainless steel, Martensitic (M) stainless steel, austenitic (A) stainless steel, austenitic - ferrite (A-F) duplex stainless steel, Austenitic - Martensitic (A-M) duplex stainless   steel and precipitation hardening (PH) stainless steel.In addition to the above three basic types of industrial stainless steel structure, there are martensitic ferrite, austenitic ferrite, austenitic martensitic transition type of composite     stainless steel, and precipitation hardening stainless steel with martensitic carbide structure.

5, according to the use of stainless steel pipe: there are stainless steel industrial pipe and stainless steel decorative pipe;

6, According to the production process of stainless steel seamless pipe and welded pipe, material is very much.

However, according to the commonly used materials, industrial pipes are mostly made of 304 or 304L, 321,310,316L and so on. Decorative pipes are mainly made of 201 and 304, and a small part of them are made of 202, 301 or 316L.