Standard: BS 1387, BS 1139, BS 6363, JIS G3101, JIS G3466, GB/T8163, GB/T3901, ASTM A312-2001, ASTM A234-2007, API 5L Grade: 10#-45#, A53-A369, ST35-ST52, Q195-Q345Grade: 10#, 20#, 45#, A53(A,B), St52, St42, St45, St37-2, St45-4, ST35, ST54, Q235, Q345...
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