Serve: kinds of steel pipe 1. Straight-seam pipe, spiral welded pipe: Welding method: electric arc weld, erw (high frequency, low frequency), gas-welding, continuous furnace welding. 1-1 longitudinal electric resistance welded steel tubes: Material:5, q235b. Specification: od.5-508, wt. 0.5-13.0. 1-2 welded stainless steel pipes for liquid delivery: Material:1cr18ni9, 0cr18ni9(304), 00 The ones in the brackets are that of american standard. Specification: od.8-630, wt. 0.3-16 1-3 stainless welded pipe for mechanical structure: Material: 1cr18ni9, 0cr18ni9 (304), 00cr18ni10 (304l), 0cr18ni10ti (321). The ones in the brackets are that of american standard. Specification: od.8-630, wt. 0.3-16. 1-4 welded pipe for low-pressure fluid delivery: Material q215a, q215b, q235a, q235b, q295a, q295b, q345a, q345b. Specification: od: 77.8-1626, wt.4-25. 2. Seamless pipe 2-1 stainless steel seamless pipe for fluid delivery: Material£º1cr18ni9, 0cr18ni9(304), 00 The ones in the brackets are that of american standard. Specification: od. 6-426, wt. 0.25-65 2-2 seamless pipe for low temperature pipeline: Material: 16mndg, 10mndg, 09dg, 09mn2vdg, 06nimodg. Specification: od.6-426, wt. 0.25-30. 2-3 cold draw seamless square tube, rectangular tube, shaped tube: material 10, 20, 35, 45, q195, q215, q235, q295, q345, q390, Specification: size: 10-400, wt. 0.8-2.5. Length: 5.8m, 6m, 12m Can serve cut length