A203 Grade A material is a kind of Nickel-alloy steel material used to fabric high-temperature pressure vessels.
A204 Grade A material is a molybdenum-alloy steel plate intended for welded boilers and other pressure vessels.
ASTM A203 and ASTM A204 Grade A Steel Comparison in Composition(%)
Grade |
C max |
Mn |
Si |
P max |
S max |
Mo |
Ni |
|
A203 Grade A |
0.17 |
0.78-0.88 |
0.13-0.45 |
0.035 |
0.035 |
- |
2.10-2.50 |
|
A204 Grade A |
0.18 (T≤ 25) |
≤ 0.90 |
0.15-0.40 |
0.025 |
0.025 |
0.45-0.60 |
- |
A203 Grade A and A204 Grade A Steel Comparison in Mechanical properties
Grade |
Tensile Strength(MPa) |
Yield Strength(MPa) min. |
% Elongation in 2 in.(50mm) min |
% Elongation in 8 in.(200mm) min |
|
A203 Grade A |
450 to 585 |
255 |
23 |
19 |
|
A204 Grade A |
450 to 585 |
255 |
23 |
19 |
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