316 stainless steel, 18Cr-12Ni-2.5Mo Due to the addition of Mo, its corrosion resistance, atmospheric corrosion resistance and high temperature strength are particularly good, and it can be used under harsh conditions; excellent work hardening (non-magnetic). Equipment used in seawater, chemical, dye, papermaking, oxalic acid, fertilizer and other production equipment; photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts. Chemical composition of 316 stainless steel: C≤0.08, Si≤1.00, Mn≤2.00, P≤0.035, S≤0.03, Ni:10.0-14.0, Cr:16.0-18.5, Mo:2.0-3.0. Mechanical properties of 316 stainless steel: tensile strength (Mpa) 620 MIN, yield strength (Mpa) 310 MIN, elongation (%) 30 MIN, area reduction (%) 40 MIN, density of 316 stainless steel 8.03 g/cm3, this value is generally used for austenitic stainless steel.The branch seat is a reinforced pipe fitting used for branch pipe connection that has been widely used abroad in recent years. It replaces the traditional branch pipe connection types such as reducing tees, reinforcement plates, and reinforced pipe sections. It has outstanding advantages such as safety and reliability, reduced cost, simple construction, improved medium flow, series standardization, and convenient design and selection. It is increasingly widely used in high-pressure, high-temperature, large-diameter, and thick-walled pipelines, replacing the traditional branch pipe connection method. The main body of the branch seat is made of high-quality forgings, and the materials used are the same as the pipeline materials, including carbon steel, alloy steel, stainless steel, etc. The branch pipe and the main pipe are welded. The connection between the branch seat and the branch or other pipes (such as short pipes, threaded plugs, etc.), instruments, and valves includes butt welding, socket welding, and threaded. There are six types of branch seats: butt-welded branch seats, socket branch seats, threaded branch seats, short-tube branch seats, miter branch seats, and elbow branch seats.