Standard API | ASTM | BS | DIN | DNV | GB | ISO | JIS | KS | LR | NF | Others
ASTM
Standard Number
A 250 (Electric Resistance Welded Carbon Molybdenum Alloy Steel Boiler and Superheater Tubes)
Grade T1 T1a T1b T2 T11 T12 T22 [ All grade ]