21CrMoV5-7
1.7709Cr-Mo-V high-temperature alloy steel for bolting at elevated temperatures up to ~550°C. Higher Cr and Mo than 15CrMoV5-9 for improved creep resistance. Used for turbine casing bolts, main flange bolts in steam power plants, and high-pressure/high-temperature petrochemical fasteners.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM A193 B16 (approx) | — | REF |
| 🇪🇺 | EN | Europe | 21CrMoV5-7 | 1.7709 | 100% |
Sources: ASTM A193, EN 10269:2013
Mechanical properties — Pro
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Elastic Modulus | ||
| Density |
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