ASTM A517 Grade B and E are both high-strength, quenched and tempered alloy steel plates for pressure vessels, but they differ in their specified maximum thickness and some mechanical property nuances, with Grade E generally allowing for thicker plates (up to 6 in.) than Grade B (up to 1.25 in.), and Grade E having slightly varying yield strengths depending on thickness, while Grade B maintains a 100 ksi minimum yield strength across its range. Both offer excellent weldability and toughness, but specific grade selection depends on the vessel's design pressure, temperature, and thickness requirements.
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A517 grade B |
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C |
P |
S |
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A517 grade B |
0.13-0.23 |
0.13-0.37 |
0.64-1.10 |
0.035 |
0.035 |
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B |
V |
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0.36-0.69 |
0.12-0.28 |
0.0005-0.005 |
0.01-0.05 |
0.02-0.09 |
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A517 grade E |
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C |
P |
S |
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A517 grade E |
0.10-0.22 |
0.08-0.45 |
0.35-0.78 |
0.035 |
0.035 |
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B |
V |
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1.34-2.06 |
0.36-0.64 |
0.001-0.005 |
0.005-0.11 |
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A517 grade B |
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A517 grade B |
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6-65 |
690 |
795-930 |
16% |
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65-150 |
620 |
725-930 |
14% |
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A517 grade E |
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A517 grade E |
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6-65 |
690 |
795-930 |
16% |
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65-150 |
620 |
725-930 |
14% |
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Grade B: Limited to 1.25 inches (32 mm).
Grade E: Can be supplied in much thicker plates, up to 6 inches (150 mm).
Grade B: Minimum yield strength of 100 ksi (690 MPa).
Grade E: Minimum yield strength of 100 ksi (690 MPa) for thicknesses up to 2.5 inches, but drops to 90 ksi (620 MPa) for thicker plates (over 2.5 inches to 6 inches).
Applications: Both are for fusion-welded pressure vessels, but Grade E's higher thickness capability suits thicker-walled vessels.
Toughness: Both have excellent Charpy V-Notch impact requirements, but Grade B specifically requires a minimum lateral expansion of 0.015 inches.
