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B seamless steel precision tube Out Diameter 18mm-121mm(1/2'' - 16'') Thickness 2mm-25mm(Sch40-XXS) Thickness tolerance <0.05mm Length 5-12m Standard GB/T3639, GB8162,GB8163, ASTM A519,A106 ,A179 A53,, EN10305-1,EN10305-4,DIN2391,DIN17175 Grade 10#,20#,35#,45#,20cr,40Cr,20CrMo,16mn,ST35, ST37,ST37.4,ST45,ST52 and etc. Technical Cold Rolled
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