ASTM A250 Alloy Boiler Tube
ASTM A250 alloy boiler tube is a resistance welded carbon-molybdenum and chromium-molybdenum alloy steel tube used in boilers and superheaters.
Chemical Requirements for ASTM A334 Grade 1 Seamless Tubes
Grade | Mfg. Process | Chemical composition(%) | |||||||
C | Si | Mn | P | S | Ni | Cr | Mo | ||
Grade 1 | S, E, AT | 0.30Max | - | 0.40~1.06 | 0.05Max | 0.60Max | - | - | - |
Grade 3 | S, E, AT | 0.19Max | 0.18~0.37 | 0.31~0.64 | 0.05Max | 0.050Max | 3.18-3.82 | - | - |
Tensile Requirements for ASTM A334 Alloy thick wall seamless pipe
Grade | Tensile Test MPa or N/mm2 | Remaks (Similar to JIS) |
|
Min Yield point | Tensile Strength | ||
Gr. 1 | 205 | 380Min | Impact Test(J) 2V 18 |
Gr. 3 | 240 | 450Min | 2V 18 |