316 stainless steel is a kind of Austenitic stainless steel, the addition of Mo element makes its corrosion resistance and high temperature strength have been greatly improved, can withstand 1200-1300 degrees of high temperature, can be used under harsh conditions. The corrosion resistance is better than 304 stainless steel, and it has good corrosion resistance in the production process of pulp and paper. And 316 stainless steel is also resistant to the erosion of the ocean and aggressive industrial atmosphere. 316 stainless steel tensile strength (Mpa) 520MIN, yield strength (Mpa) 205MIN, elongation (%) 30MIN. Its main uses are pulp and paper equipment heat exchanger, dyeing equipment, pipelines, coastal area building external materials. Stainless steel bend pipe is a common pipe connection element, widely used in chemical industry, petroleum, natural gas, shipbuilding and other industries. It realizes the turn of the pipeline in the horizontal or vertical direction through the shape of the curve, making the pipeline layout more flexible and reasonable. The process of manufacturing stainless steel elbow is very important, which is directly related to its quality and reliability.