Standard API | ASTM | BS | DIN | DNV | GB | ISO | JIS | KS | LR | NF | Others
NF
Standard Number
A49-213 (Steel Tubes Seamless Unalloyed and Mo Crmo Alloy Steel Tubes for Use at High )
Grade TU37C TU42C TU42CR TU48C TU48CR RU52C TU15D3 TU15CD2-05 TU10CD5-05 TU10CD9-10 TUZ10CD5-05 TUZ10CD9 TUZ10CDNbV9.2 [ All grade ]