Forging is a method of processing metal mechanical parts parts blank with the help of tools dies under impact pressure. Compared with other processing methods, the forging processing productivity is high; the shape size stability of stainless steel forgings are good, the comprehensive mechanical properties are good. The major advantages of stainless steel forgings are high toughness, reasonable fiber structure, small changes in properties between parts. The internal quality of stainless steel forgings is related to the processing history will be surpassed by any metal processing technology.

The advantage of stainless steel forging is that after plastic deformation, internal defects are eliminated, such as forging (welding) cavity, compaction loosening, breaking carbide non-metallic inclusions making them distribute along the deformation direction, improving eliminating the composition segregation, etc., so as to obtain uniform, fine macrostructure macrostructure. The casting obtained by casting process can obtain more accurate size more complex shape than forging, but it is difficult to eliminate the defects such as porosity, cavity, composition segregation non-metallic inclusions; although the casting has high compressive strength, it is difficult to use under the condition of large tensile stress. The parts obtained by mechanical processing have high dimensional accuracy smooth surface, but the internal flow line of metal is often cut off, which is easy to cause stress corrosion, the ability to bear tension compression alternating stress is poor.