... : Q235B, Q345B, 20#, STKR400,STKR490, ASTMA36,ASTM500 Standard: GB/T3094,JIS G3466,Normal SizeDiammT(mm)Dia (mm)T(mm)Dia (mm)T ... , 20#, ST37, ST44, ST52, ASTM A53, ASTM A106,STKR4903) Standards: JIS G 3466, DIN EN 10210, DIN EN10219, ASTM A500, GB ...