GB/T 5310-2017 20g、20mng、25mng, etc
ASME SA 106 Gr. B, Gr. C
ASME SA 210 Gr. A1, Gr. C
ASME SA 213 T11, T12, T22, etc
ASME SA 335 P11, P12, P22, etc
Seamless ferro tube pro summus pressura boilers
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