Seamless steel tubes are formed through cold drawing and hot rolling processes. Overview of the two steel tube production processes: 1. Cold Drawing (Hot Rolling) Seamless Steel Tubes: Round billet → Heating → Piercing → Heading → Annealing → Pickling → Oiling (Copper Plating) → Multi-pass Cold Drawing (Cold Rolling) → Billet → Heat Treatment → Straightening → Hydrostatic Test (Non-destructive Testing) → Marking → Storage. 2. Hot Rolling (Extrusion Seamless Steel Tubes): Round billet → Heating → Piercing → Three-roller oblique rolling, continuous rolling, or extrusion → Tube removal → sizing (or reducing diameter) → Cooling → Billet → Straightening → Hydrostatic Test (or Non-destructive Testing) → Marking → Storage.

Tianjin Seamless Steel Tube Factory is a large-scale seamless steel tube enterprise. *Manufactures and sells large-diameter seamless steel tubes, exporting various oil casing pipes, structural tubes, fluid tubes, high-pressure tubes, alloy tubes, and conforms to national standards; GB8162-2008; GB8163-2008; GB5310-2008.12CR1MOVG; 15CRMOG; P110. Quality guaranteed, wide variety, agents for oxygen吹管; sizes from small 8*1 to large 180; seamless steel tubes ranging from small diameter 6*1 mm to large diameter 820*10-180 mm, favored by both new and old customers.

Alloy Seamless Steel Pipe Materials: 12Cr1MoV, P22 (10CrMo910) T91, P91, P9, T9, WB36, Cr5Mo (P5, STFA25, T5,), 15CrMo (P11, P12, STFA22), 13CrMo44, Cr5Mo, 15CrMo, 25CrMo, 30CrMo, 40CrMo. National Standard for Alloy Seamless Steel Pipe: DIN17175-79, JISG3467-88, JISG3458-88, GB5310-2008, GB9948-2006, ASTM A335/A335m, ASTM A213/A213m. Alloy Pipe [(Outer Diameter - Wall Thickness) * Wall Thickness] * 0.02483 = kg/m (Weight per meter)