The material of stainless steel pipe, stainless steel can be classified into several categories depending on matrix. Details are as below: 

1. Ferritic stainless steel
The chromium content of this kind stainless steel is 12%~30%, which makes corrosion resistance, toughness and weldability develop with the increasing of chromium. And its anti-chloride ability is superior to other stainless steel.

2. Austenitic stainless steel
Chromium content is more than18%, and also have nickle about 8% and a small amount of molybdenum, titanium and nitrogen and so on. The steel owns a excellent comprehensive property to resist various corrosion.

3. Austenitic-ferritic duplex stainless steel
Combine the features of ferritic stainless steel and austenitic stainless steel, and also possesses superplasticity.

4. Martensite Stainless Steel
It possesses high strength, but lacks plasticity and weldability.

5. PH Stainless Steel
It is provided with outstanding forming ability and weldability and can be applied as ultrahigh strength material in the fields of nuke industry, aviation and aerospace inductry.