Standard API | ASTM | BS | DIN | DNV | GB | ISO | JIS | KS | LR | NF | Others
GB
Standard Number
GB T9948 (Seamlesss steel tube for petroleum cracking)
Grade 10 20 12CrMo 15CrMo 1Cr2Mo 1Cr2Mo 1Cr19Ni9 1Cr19Ni11Nb [ All grade ]