1.high-quality carbon steel; 2.refined cold drawing; 3.bright non-oxidation heat ... :Outside diameter:4-30mm, Wall thickness:0.8-6mmStandard and Steel Grade:DIN73000, DIN2391, DIN EN10305-1, DIN 17175,DIN2448/ ... Hydrulic System Steel Pipe,Automotive steel pipe,And other customers have high requirements in steel pipe precision,finish,cleanliness,mechanical properties. high precision seamless steel tube