Stainless steel elbows do not cause corrosion, pitting, rust or wear. Stainless steel is still one of the most powerful building metal materials. Because stainless steel has good corrosion resistance, it can make structural parts permanent to maintain the integrity of Engineering design. Stamping elbow of stainless steel containing chromium is also a combination of mechanical strength and high extensibility. It is easy to process and manufacture parts and meets the needs of architects and structural designers. All metals react with oxygen in the atmosphere to form oxide films on the surface. Unfortunately, iron oxide formed on common carbon steel is oxidized successively, which enlarges the corrosion and eventually forms holes. Carbon steel can be electroplated with paint or oxidation-resistant metals (e.g., zinc, nickel and chromium), but as is known, this protection is only a thin film. In addition, the front end of the push head is usually large outside diameter, which needs to be shaped through the shaping die. The whole die is actually a press, with a set of dies, two semi-circular arcs, one upper and one lower. After shaping, the outer diameter of the finished product meets the size requirements. The wall thickness is controlled since then. The wall thickness tolerances of elbows and pipes are the same, both of which are (+12.5%). In addition to chromium, the commonly used alloying elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc. to meet the requirements of various uses for the structure and function of stainless steel stamping elbows.