ASTM A204 Grade A pressure vessel steel
A204 this property is based on it's Mo composition. ASTM A-204/A-204M A204 has three grades or levels-- Grade A/B/C. A204 steel grade specification covers molybdenum alloy, intended particularly of welded boilers and others pressure vessels steel plate in A204 Gr. A,A204 Gr .B and A204 Gr .C.All these steel grades are normally used for pressure vessel steel plates,for A204 Grade A and SA204 Grade A pressure vessel steel plate,the minimum yield strength is 255 Mpa,tensile strength within 450-585 Mpa,for pressure vessel steel plate A204 Grade B and SA204 Grade B,the minimum yield strength is 275 Mpa,tensile strength within 485-620 Mpa,for boiler steel plate A204 Grade C and SA204 Grade C,yield strength shall be above 295 Mpa,tensile strength from 515 Mpa to 655 Mpa.
Mechanical properties for A204 Grade A pressure vessel steel
Yield strength (Mpa) |
Tensile strength (Mpa) |
Elongation≥,% |
|
255 |
450-585 |
19 |
Chemical composition of Heat analysis for A204 Grade A Nickel-alloy steel(Max %)
Thickness |
C |
Si |
Mn |
P |
S |
Mo |
|
T≤25 |
0.18 |
0.15/ |
0.90 |
0.035 |
0.035 |
0.45/ |
|
25＜T≤50 |
0.21 |
|||||
|
50＜T≤100 |
0.23 |
|||||
|
T＞100 |
0.25 |
ASTM A204 Gr.A pressure vessel steel is widely used to make the reactor, heat exchanger, separator, spherical tank, liquefied gas, nuclear reactor pressure vessel, boiler steam drum steam, liquefied petroleum, hydropower station, high pressure pipe.
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