precision cold rolled 4130 4135 4140 seamless steel pipe Standard ASTM A106, ASTM A53, API 5L Gr.B, DIN17175,DIN1629 Material ST37,ST44,ST45, ST52, S45C,ASTM A106B, ASTM A53B,API 5L Gr.B Outer diameter 13.7mm-219.1mm Wall thickness 1.5mm-20mm Length 3-12m, random or fixed, as the clients' requests Technology Cold Rolled Tolerance Control within the standard, OD:+/- 0.05mm, ID:+/-0.05mm,WT:+/-0.05mm Advantages 1.Short delivery time 2.Quality assurance 3.Competitive price 4.Superior Service
