Stainless steel elbow is a kind of pipe fitting used at the branch of pipeline. For the manufacture of elbows with seamless pipes, the commonly used processes include hydraulic bulging and hot pressing. The hydraulic bulging of the stainless steel elbow is a forming process in which the branch pipe is expanded by the axial compensation of the metal material. The process is to use a special hydraulic press to inject liquid into the tube blank with the same diameter as the elbow, and to squeeze the tube blank through the synchronous centering movement of the two horizontal side cylinders of the hydraulic press. The pressure of the liquid increases as the volume of the tube becomes smaller. When the pressure required for the expansion of the stainless steel elbow branch tube is reached, the metal material flows along the inner cavity of the mold under the dual action of the side cylinder and the liquid pressure in the tube blank to expand the branch tube. .

The hydraulic bulging process of the stainless steel elbow can be formed at one time, and the production efficiency is high; the wall thickness of the main pipe and the shoulder of the stainless steel elbow are increased.