... *5mm 3)Round section shap 4)Seamless steel oil pipeline API seamless steel oil pipeline1)material:10#&20#carbon ... GB 3087, GB/T 8162 ,GB/T8163 10# 20#, ,3.Outer Diameter2-20 mm4.Wall Thickness21.3-810 mm5.Length6m,12m ... X46,X52,X56,X60,X65, etc11.Usagefor petroleum/ natural gas pipeline , for conveying water,drainage,coal gas, mineral slurry and ... 0655; ISO9001:2000,IBR or BV seamless steel oil pipeline