With a process or a few processes may be completed complex forging finishing. Because there is no flash, forging the force area is reduced, the required load is reduced. However, care should be taken not to completely limit the billet, in order to strictly control the volume of billet to control the relative position of forging die and forging measurements, and strive to reduce the wear of forging die. Flat welding flange
at low temperature forging, the forging of the dimensional change is very small. Forging below 700 ℃, the formation of small oxide, and no decarburization on the surface.