Hot (hot extrusion) 54 ~ 480mm total of 45 kinds of steel pipe diameter; wall thickness of 4.5 ~ 45mm total of 36 species. Cold drawn (rolled) steel pipe diameter 6 ~ 200mm total of 65 species; wall thickness of 0.5 ~ 21mm total of 39 species. C, inside and outside surfaces of steel pipes shall not have cracks, folding, crack, crack, rolled off, there is separation and scarring defects, these defects should be completely removed (except for tube machining) stainless steel pipe wall thickness shall be cleared after and diameter than the negative deviation. Whoever does not exceed the allowable negative deviation of the other minor surface defects do not cleared. Stainless steel exports are an important part of China's export economy, China's economic growth it has an important role, however, the situation in China's foreign trade of stainless steel, China's steel exports encounter greater resistance. For external export difficulties, China's steel industry on the one hand you want to safeguard their rights, but the most important thing is China's steel industry to continue to improve their level of quality, and a comprehensive upgrade of all imports of stainless steel pipes are stainless steel sheet material level manufacturing features are: no blisters, no sand holes 316l stainless steel pipe, stainless steel decorative tube no black spots, no cracks, weld formation. Bending, cutting, welding processing performance advantages, stable nickel content, products comply 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. 304 stainless steel pipe, stainless steel tube, Billion-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!