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We can produce and supply Welded steel pipes. The steel grade: HR, CR, GI The shape is: Circular pipes, rectangle pipes, square tube. I’m Alice who come from jiangyin xinggang, the steel metal molds comparison table as follow, pls check: Circular pipe OD(mm) Thickness (mm) Rectangle pipe Thickness(mm) 15.8 0.6-1.8 13 x 25 0.6-1.8 16 0.6-1.8 19 x 35 0.7-1.8 19 0.6-1.8 20 x 30 0.8-1.8 21.3 0.8-2.0 20 x 40 0.8-1.8 22 0.6-2.0 20 x 50 0.85-2.0 25 0.8-2.0 30 x 40 0.85-2.0 25.4 0.8-2.0 30 x 40 0.85-2.0 26.9 0.8-2.0 30 x 60 1.0-2.5 28 0.8-2.0 40 x 60 1.0-2.5 32 0.6-2.0 40 x 80 1.0-3.0 33.7 0.8-2.0 50 x 70 1.2-3.0 35 0.8-2.0 38 0.8-2.0 Square pipe Thickness(mm) 41 0.7-2.0 12 x 12 0.6-1.8 42 0.85-2.5 15 x 15 0.8-1.8 44.5 0.85-2.5 20 x 20 0.8-1.8 45 0.9-2.5 22 x 22 0.8-1.8 48 0.9-2.5 25 x 25 0.8-1.8 48.3 0.9-2.5 30 x 30 0.8-1.8 50 0.85-3.0 38 x 38 1.0-2.5 50.8 0.85-3.0 40 x 40 1.0-3.0 60.3 0.85-3.0 45 x 45 1.0-3.0 63.5 1.0-3.0 50 x 50 1.2-3.0 73 1.0-3.0 60 x 60 1.2-3.0 76 1.2-3.0 65 x 65 1.2-3.0 88.9 / 57 1.2-3.0