Standard API | ASTM | BS | DIN | DNV | GB | ISO | JIS | KS | LR | NF | Others
NF
Standard Number
A49-643 (Steel Tubes Round Square and Rectangular Steel Tubes for Ordinary Longitudinally Pressure Welded and Cold Formed From Flat Froducts)
Grade TS30-1 TS30-2 TS34-2 TS37-2 TS42-2 TS47-2 TS335D TS390D TS445D [ All grade ]