... grade:Q215A Q215B Q235A Q235B7)Standard weight class:STD8)Class A test pressure(Mpa):4.83MPa-13.10Mpa9)Test pressure ... .27kg/m-16.07kg/m11)Production:Has the following production steps:a. Round preparation, b. Heating, c. Hot perforation, d. Cutting ... Degreasing, j. Solution heat treatment, k. Straightening, l. Cutting, m. Pickling, n. Inspection.12)Application:Widely used in fire fighting, gas pipes ...