Q355B square steel tube, 20# seamless square tube, rectangular tube, special-shaped square tube, large-diameter square tube, Q355B seamless square tube, Q355C seamless square tube, large-diameter square tube, seamless square tube, thick-walled square tube, large-diameter thick-walled square tube, Q355D square tube, rectangular tube, stainless steel square tube, stainless steel rectangular tube, non-standard square tube. Custom sizes available upon customer request.

Seamless steel tube materials: 20#, 16Mn, Q235B, Q345B/C/D/E seamless square tubes, 45Mn2, 27SiMn, Cr5Mo, 12CrMo(T12), 12Cr1MoV, 10CrMo910, T91, 15CrMo20G, 40Cr, 35CrMo, 42CrMo, 20G, etc. alloy pipes.

Seamless square and rectangular tube production specifications: Square tubes ranging from 20*20 to 600*600, rectangular tubes from 20*30 to 600*800, thickness from 2.0mm to 35mm.

Seamless square steel tubes are made of materials such as Q235, Q355 (Q345B/C/D), 20#, 45#, S275, S355JR, S355J0, S355J2, SS400, STKR490, STKR400, Q450NQR1, SPA-H, Q420, Q460C, C350, etc.

Standard square steel pipes and other steel sections; capable of complying with multiple domestic and international standards including GB, SY, JG, API, ASTM, DIN, JIS, etc.

The product is widely used in various industries such as glass curtain walls, large-scale steel structure projects, mechanical manufacturing, shipbuilding, bridges, construction, metallurgy, automotive industry, railways, highways, aviation, containers, furniture, and decoration.