Socket welding cross is a common pipe fitting, mainly used to achieve branch connections in pipeline systems. It has two types: equal-diameter and reducing-diameter. The size of the nozzle end of the equal-diameter cross is the same, while the size of the main pipe nozzle and the branch nozzle of the different-diameter cross are different. Stainless steel spools are usually manufactured using hydraulic bulging or hot press forming processes and have excellent corrosion resistance and wear resistance. Stainless steel four-way is widely used in many industrial fields, including petroleum, chemical industry, shipbuilding, food, pharmaceutical, electric power and water treatment, etc. Its corrosion resistance and wear resistance make it excellent in these fields, and it is suitable for transporting media such as liquids, gases and hot water.