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21CrMoV5-7 Stress-Rupture Tables (Larson-Miller)
The 21CrMoV5-7 stress-rupture tables give the 10,000, 100,000 and 200,000 hour rupture stress at temperatures from 450 to 575 deg C, derived from the EN 10269 Annex A Larson-Miller envelope. Use as the design input for elevated-temperature bolted-joint stress analysis on steam turbine, gas turbine, pressure-vessel and refinery applications.
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Stress-Rupture Envelope (to EN 10269 Annex A)
| Temperature | 10,000 h rupture | 100,000 h rupture | 200,000 h rupture (extrapolated) |
|---|---|---|---|
| 450 deg C | ~580 MPa | ~470 MPa | ~440 MPa |
| 475 deg C | ~510 MPa | ~400 MPa | ~375 MPa |
| 500 deg C | ~430 MPa | ~340 MPa | ~315 MPa |
| 525 deg C | ~370 MPa | ~290 MPa | ~265 MPa |
| 540 deg C | ~330 MPa | ~260 MPa | ~235 MPa |
| 550 deg C | ~250 MPa | ~180 MPa | ~155 MPa |
| 575 deg C | ~180 MPa | ~120 MPa | extrapolation marginal |
1 Percent Creep Strain
| Temperature | 1 percent at 100,000 h (MPa) |
|---|---|
| 500 deg C | ~280 MPa (80 percent of rupture) |
| 525 deg C | ~235 MPa |
| 540 deg C | ~210 MPa |
| 550 deg C | ~150 MPa |
Larson-Miller Master Curve
Larson-Miller parameter (LMP = T(K) x (20 + log t(h)) x 10^-3) collapses the time-temperature creep envelope onto a single master curve. For 21CrMoV5-7:
| Rupture stress (MPa) | LMP (x 10^-3) |
|---|---|
| 400 | 19.5 |
| 350 | 19.8 |
| 300 | 20.3 |
| 250 | 20.9 |
| 200 | 21.4 |
| 150 | 22.0 |
Design Margin
For bolted-joint design, allowable stress is typically taken as the lesser of: (a) 67 percent of the 100,000-hour rupture stress at design temperature; (b) the 0.2 percent proof stress at design temperature. The design-life margin is conservative for cyclic-load bolted joints and aggressive for monotonic-load joints.
Related Reference Pages
More reference materials: Datasheet · Torque Chart · Bolt Dimensions · FAQ. Properties: Creep-Rupture · Elevated-Temp Properties. Back to the 21CrMoV5-7 Alloy Hub.
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