40CrMoV4-6
1.7711Chromium-molybdenum-vanadium creep-resisting steel for high-temperature fasteners and bolts per EN 10269. Excellent creep resistance up to 540°C with tensile strength 850–1000 MPa after quenching and tempering. Widely used for steam turbine bolts, pressure vessel fasteners, and power generation components. Equivalent to ASTM A193 Grade B16.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | A193 B16 | K14072 | REF |
| 🇫🇷 | AFNOR | France | 40CDV4 | — | 95% |
Sources: ASTM A193, NF EN 10269
Chemical composition comparison (wt%)
Side-by-side: 40CrMoV4-6 (EN) (EN 10269:2013) vs 40CDV4 (AFNOR)
| Element | 40CrMoV4-6 (EN) | 40CDV4 (AFNOR) | Overlap |
|---|---|---|---|
| C | 0.36–0.44% | — | — |
| Si | ≤ 0.4% | — | — |
| Mn | 0.45–0.85% | — | — |
| P | ≤ 0.03% | — | — |
| S | ≤ 0.03% | — | — |
| Cr | 0.9–1.2% | — | — |
| Mo | 0.5–0.65% | — | — |
| V | 0.25–0.35% | — | — |
| Al | ≤ 0.015% | — | — |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 850–1000 | MPa |
| Yield Strength | ≥ 640 | MPa |
| Elongation | ≥ 14 | % |
| reduction_of_area | ≥ 45 | % |
| Hardness HB | 250–300 | HB |
| impact_kv | ≥ 25 | J |
| Density | ≥ 7.85 | g/cm3 |
| Elastic Modulus | ≥ 210 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| normalizing | 880–900 °C | air | — | — |
| quenching | 900–930 °C | oil | — | — |
| tempering | 600–700 °C | air | — | Target 250-300 HB |
| annealing | 680–730 °C | furnace | — | Soft annealing |
Compatibility verdict
40CrMoV4-6 and 40CDV4: 95% composition match
Close equivalents but NOT identical.
Related materials
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