Tensile strength and yield strength retention from 20degC to 815degC for all six high-temperature fastener grades, based on our own melt data and published minimums.
One of the most common errors in high-temperature bolt specification is selecting a material based on its room-temperature strength rather than its strength at operating temperature. A-286 looks competitive with Inconel 718 at 20degC, but at 650degC the gap widens dramatically, and above 700degC, only Nimonic 80A and higher-end grades remain viable. This page provides tabulated strength-at-temperature data for informed decision-making.
| Temp (°C) | Inconel 718 (TS) | Inconel 718 (YS) | A-286 (TS) | A-286 (YS) | Nimonic 80A (TS) | Nimonic 80A (YS) | C-276 (TS) | C-276 (YS) | Monel K-500 (TS) | Monel K-500 (YS) | Inconel 625 (TS) | Inconel 625 (YS) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20°C | 1275 | 1030 | 1000 | 690 | 1100 | 620 | 790 | 355 | 1100 | 790 | 930 | 517 |
| 200°C | 1230 | 1000 | 960 | 665 | 1060 | 600 | 740 | 315 | 950 | 720 | 880 | 470 |
| 400°C | 1160 | 950 | 910 | 630 | 1000 | 570 | 660 | 270 | 900 | 710 | 810 | 420 |
| 600°C | 1080 | 900 | 700 | 550 | 930 | 540 | 600 | 250 | 750 | 640 | 700 | 380 |
| 700°C | 900 | 790 | 420 | 380 | 780 | 490 | 550 | 240 | 600 | 540 | 550 | 340 |
| 815°C | 550 | 500 | 250 | 220 | 400 | 320 | 450 | 220 | 350 | 320 | 420 | 280 |
Per-grade retention cards, giving the percentage of room-temperature tensile each grade still holds at 400, 600, 700 and 815°C, are in strength retention by grade.
Data source and limitations: Values are from our own VIM+VAR melted heats tested per ASTM E21 at temperature with 30-minute soak. These represent typical performance; minimum guaranteed values per ASTM/AMS specifications may be lower. For critical applications, request a heat-specific elevated-temperature tensile report with your order. Stress-rupture data (100h, 1000h, 10,000h Larson-Miller parameter curves) available on request.
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