Seamless steel tubes for high-pressure boilers

GB/T 5310-2017

GB/T 5310-2017 20g、20mng、25mng, etc

ASME SA-106/SA-106M-2015

ASME SA 106 Gr. B,  Gr. C

ASTMA210(A210M)-2012

ASME SA 210 Gr. A1, Gr. C

ASME SA-213/SA-213M

ASME SA 213 T11, T12, T22, etc

ASTM A335/A335M-2018

ASME SA 335 P11, P12, P22, etc