ASTM A516 Grade 55 vs ASTM A516 Grade 70
Property comparison of ASTM A516 Grade 55 and ASTM A516 Grade 70, both carbon steel.
| Property | ASTM A516 Grade 55 | ASTM A516 Grade 70 | Difference |
|---|---|---|---|
| Yield strength | 205 MPa | 260 MPa | +27% |
| Tensile strength | 380 MPa | 485 MPa | +28% |
| Elongation | 23 % | 17 % | -26% |
| Elastic modulus | 200,000 MPa | 200,000 MPa | 0% |
| Shear modulus | 77,000 MPa | 77,000 MPa | 0% |
| Poisson ratio | 0.3 | 0.3 | 0% |
| Density | 7,850 kg/m³ | 7,850 kg/m³ | 0% |
| Thermal conductivity | 65.4 W/m·K | 62.7 W/m·K | -4% |
| Specific heat | 457 J/kg·K | 459 J/kg·K | 0% |
| Coefficient of thermal expansion | 0.000012 1/K | 0.000012 1/K | 0% |
Difference is ASTM A516 Grade 70 relative to ASTM A516 Grade 55. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- Grade 55
- standard
- ASTM A516/A516M
- heat treatment
- Normalized
- grade
- Grade 70
- standard
- ASTM A516/A516M
- heat treatment
- Normalized
About ASTM A516 pressure vessel plate
A516 is the standard carbon steel plate for moderate-temperature pressure vessels. Grades 55, 60, 65, and 70 differ in tensile strength (in ksi). Grade 70 is the most common for shells and heads in ASME boilers and pressure vessels.
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