... : 1: API certificate. 2: 3,000,000 Mt per year. 3: ASTM A106 Gr.B 4: ASME B36.10 Standard: JIS, GB, DIN, ASTM ... , APIStandard: JIS G3454-2007, JIS G3455-2005, GB/T ...Grade: 10#-45#, 16Mn, ST35-ST52, Q195-Q345Grade: 20#, 45#, 16Mn, St52 ... , ST 52 (5) Tolerate: OD :+1% / -1% WT: +12.5% / -10% (6) Technics : hot rolled .or cold rolled (7) Packing : paint ...