φ17-φ630,criterion for Implementation GB/T3091-2001,GB/T9711.1-1997,API 5L,API 5CT,ASTM A106,ASTM A53,BS1387-1985,Material:Q195,Q215,Q235,Q345,A106,A36,we can also produce the following special specs according to customers requirement.70,102,108,121,127,133,152,159,168,180,194,203,245,299,351 etc.