Standard API | ASTM | BS | DIN | DNV | GB | ISO | JIS | KS | LR | NF | Others
NF
Standard Number
A49-214 (Steel Tubes Seamless Austenitic Steel Tubes for use at High Temperatures )
Grade Z6CN19-10 Z3CND17-12B Z6CNT18-12B Z6CNNb18-12B Z8CNDT17-13B Z10CNWT17-13B [ All grade ]