标准
API 5L,EN10217,EN10219, API, API 5CT, API 5L, ASTM A53-2007, ANSI B36.10M-2004, ASTM A513-2007, ASME B36.19M-1985, BS 1387, BS 6363
等级
16mn, 16mn, A53-A369, A53(A,B), A106(B,C), A210, ST35-ST52, ST37, ST42, ST45, ST35.8, St37-2, ST35.4, St52.4, ST35, ST37.4