Detailed Product Description Square tubeMaterial: Q235, Q195Dimension: from 10*10 to 500*500Rectangular Steel PipeMaterial: Q235 Q195Dimension: from 10*20 to 300*500 Place of OriginTianjin, China (Mainland)StandardBS, JIS, GB, ASME, ANSI, DINGrade20G, A106B, A179B, A234B, A53B, API J55, API K55, API L80, API N80, API P110, Din2391 17 Cr3, Q195, Q235, ST37Thickness0.5~ ...