202 stainless steel is 200 series stainless steel one. 200 series stainless steel is a low-Ni high-manganese steel, nickel content is generally below 4%, 8% manganese content, the Ni-based stainless steel.

Introduction
202 stainless steel is widely used in building decoration, municipal engineering, highway guardrail, hotel facilities, shopping malls, glass handrails, public facilities and other places. Tube by the high-precision automation equipment, erosion by melting their own welding, rolled and shaped, in the absence of any metal filler, the filled gas (inner and outer tubes) welded together, for the TIG welding process, and solid solution for online eddy current flaw detection.

Chemical composition:
  1Cr18Mn8Ni5N
      C: ≤ 0.15
  Si: ≤ 1
  Mn: 7.5-10
  P: ≤ 0.06
  S: ≤ 0.03
  Ni: 4-6
  Cr: 17-19
  Mo: No
  Cu: no
  N: ≤ 0.25
  Other: None

Stainless steel knowledge
Stainless Steel (Stainless Steel) refers to the resistance of air, steam, water and other weak corrosive medium and acid, alkali, salt and other chemical etching medium corrosion of steel, also known as acid-resistant stainless steel. Practical applications, often the weak corrosion medium corrosion resistance as stainless steel, while the chemical resistance of steel known as acid corrosion of steel. As the two differences in chemical composition, the former is not necessarily resistant to chemical corrosion, while the latter generally has a stainless nature. The corrosion resistance of stainless steel depends on the alloying element contained.