All imported stainless steel tubes are manufactured of stainless steel sheet material level, features are: no blisters 316l stainless steel, no sand holes, no black spots, no cracks, weld formation. Bending, cutting, welding processing performance advantages, stable nickel content stainless steel pipe products in line with Chinese GB, American ASTM, JIS in Japan and other norms! Hot-rolled (extruded seamless pipe): round tube → heating → perforation → three-roll rolling, rolling or extrusion → → set off pipe diameter (or reducing) → cooling → → straightening → hydrostatic pipe billet test (or testing) → mark → storage. Cold drawn (rolled) seamless steel pipe: round tube → heating → perforation → Heading → annealing → pickling → oiled (copper) → multi-pass cold drawn (cold) → billet tube heat treatment → → straightening → hydrostatic testing (testing) → mark → storage. 1. The heat treatment process solution treatment temperature of 304 stainless steel tube is 1080-1100 ℃, cooling method for water or air cooling. Cold intermediate annealing temperature more in 850-970 ℃, holding a certain time after the water cooling. After solution treatment organization for austenite steel decorative stainless steel pipe, and sometimes there is a small amount of ferrite. Bao Jie Tianjin Shengda Trading Company specializes in the wholesale of various stainless steel plate, stainless steel pipe, stainless steel products, welcome to contact us stainless steel piping | stainless steel pipes | Shengda-commerce provided by Tianjin Bao Bao Jie Shengda Trading Company. Bao Jie Tianjin Shengda Trading Company (www.sdbjsm.com) strong, credible, in Tianjin's daily hardware industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Shengda treasure-commerce and you hand into the brilliant, for a better future!