ASTM A203 Grade B and Grade E are nickel-alloy steel plates for welded pressure vessels, differing mainly in nickel content and suitability for different temperatures, with Grade B typically having ~2.25% Ni (2% Nickel Steel) for general use, and Grade E around 3.25% Ni (3% Nickel Steel) for lower temperature service, both requiring normalization and meeting specific mechanical (tensile/impact) properties, used widely in oil, gas, and chemical industries.
Chemical Composition
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A203 Grade BChemical Composition |
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Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
|
|
A203 Grade B |
0.17 |
0.13-0.45 |
0.78-0.88 |
0.035 |
0.035 |
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A203 Grade EChemical Composition |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
|
|
A203 Grade E |
0.20 |
0.13-0.45 |
0.70-0.80 |
0.035 |
0.035 |
Mechanical Property
|
Mechanical Property of A203 Grade B steel plate |
A203 Grade B |
|
Tensile strength, kis [MPa] |
70-90[485-620] |
|
Yield strength, min, kis [MPa] |
40 [275] |
|
Elongation in 8 in. [200 mm], min, % |
17 |
|
Elongation in 2 in. [50 mm], min, % |
21 |
|
Mechanical Property of A203 Grade E steel plate |
A203 Grade E |
|
Tensile strength, kis [MPa] |
70-90 [485-620] |
|
Yield strength, min, kis [MPa] |
40 [275] |
|
Elongation in 8 in. [200 mm], min, % |
17 |
|
Elongation in 2 in. [50 mm], min, % |
21 |
Key Differences & Similarities:
Material Type: Both are ASTM A203 nickel-alloy steel plates designed for pressure vessels.
Nickel Content:
Grade B: Contains approximately 2.25% Nickel (2% Ni steel).
Grade E: Contains approximately 3.25% Nickel (3% Ni steel).
Application: Both serve the high-temperature pressure vessel industry, especially for oil, gas, and chemical applications, but Grade E's higher nickel content provides better low-temperature toughness.
Mechanical Properties: They share similar mechanical properties, but Grade E's composition is better suited for colder service conditions.
Heat Treatment: Both grades typically require a normalizing heat treatment.
