Standard API | ASTM | BS | DIN | DNV | GB | ISO | JIS | KS | LR | NF | Others
NF
Standard Number
A49-245 (Steel Tubes Longitudinally Welded Tubes For Ferric Non Alloy and Alloy Steel Heat Exchangers )
Grade TS34C TS37C TS42C TS48C TS24W3 TSE36WB3 TS34BT TS42BT TS17N2 TS10N9 [ All grade ]