"cold drawn seamless steel tube"

1 Inci 2 Inci ASTM A53 Gr.a ST52 E355 Cold Rolled Hydraulic Cylinder Piping Antirust Annealing

1 Inch 2 Inch ASTM A53 Gr.a ST52 E355 Cold Rolled Hydraulic Cylinder Piping Antirust Annealing In the standard is DIN 2391-1 . The raw material of the hydraulic steel pipe is finely drawn, oxidation-free bright heat treatment (NBK state), non-destructive testing, the inner hole of the steel pipe is high-pressure flushed, pickled, the inner and outer walls of the steel pipe are treated with anti-rust oil to prevent rust, and the two ends are capped as dust-proof treatment.