Standard API | ASTM | BS | DIN | DNV | GB | ISO | JIS | KS | LR | NF | Others
GB
Standard Number
YB T5052 (Geological Drilling Pipe Seamless Pipe For Diamond Core Boring)
Grade DZ40-45Mnb DZ40-50Mn DZ50-40Mn2 DZ50-40Mn2Si DZ55-40Mn2Mo DZ55-40MnVB DZ60-45MnMoB DZ65-27MnMoVB [ All grade ]