2205 duplex stainless steel elbow has excellent intergranular corrosion resistance and uniform corrosion resistance, both of which are better than 304L steel and 316L steel. The welding performance is good, the tendency of hot cracking is low, the brittleness tendency is small, can be cold, hot processing and forming. However, deep drawing, deep drawing, spinning and other cold forming is more difficult than austenitic stainless steel. Generally cold deformation of 10%, need to do solid solution annealing treatment. Cold bending deformation of more than 20% or the use of conditions to produce stress corrosion of the workpiece should be done with solid solution annealing treatment. Hot forming such as hot bending should be heated at 950 to 1150 degrees. Solid solution annealing treatment should be done after hot forming. Oil and gas production in acid with 2205 duplex stainless steel and stainless steel elbow, oil refining, pulp, chemical fertilizer, petrochemical and other fields, with the hand manufacturing heat exchanger, and condenser should be easy to produce pitting and stress corrosion of pressure equipment, can replace 304L and 316L austenitic stainless steel elbow.
2205 duplex stainless steel is used for oil and gas pipeline in Sweden, first developed SAF2205 steel. 00Cr22Ni5Mo3N steel was developed in China in 1980s. The American brand is UNS 31803 SAF2205. German brand is: W-Nr, 1.4462, DINX2CrNiMoN2253, France is 2205-03 Z2CND, Sweden is SS2377.
Source: Yaang Pipe Industry Co., Limited (www.yaang.com)