35NiCr6
1.5815Nickel-chromium quenched and tempered steel with 1.2–1.6% Ni and 0.9–1.1% Cr for high strength and excellent impact toughness. Good hardenability for uniform properties in medium cross-sections. Used for heavy-duty engine parts, crankshafts, gears, shafts, piston rods, and bolts. Important grade in aerospace (AIR 9160/C as 35NC6) and heavy mechanical engineering.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 3140 | — | REF |
| 🇫🇷 | AFNOR | France | 35NC6 | — | 97% |
| 🇬🇧 | BS | United Kingdom | 640M40 / EN111 | — | 93% |
Sources: ASTM A29, NF EN 10083-3, BS 970
Chemical composition comparison (wt%)
Side-by-side: 35NiCr6 (EN) (EN 10083-3:2006) vs 35NC6 (AFNOR)
| Element | 35NiCr6 (EN) | 35NC6 (AFNOR) | Overlap |
|---|---|---|---|
| C | 0.3–0.37% | — | — |
| Si | ≤ 0.4% | — | — |
| Mn | 0.6–0.9% | — | — |
| P | ≤ 0.025% | — | — |
| S | ≤ 0.025% | — | — |
| Cr | 0.9–1.1% | — | — |
| Ni | 1.2–1.6% | — | — |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 880–1080 | MPa |
| Yield Strength | ≥ 740 | MPa |
| Elongation | ≥ 12 | % |
| reduction_of_area | ≥ 40 | % |
| Hardness HB | 260–320 | HB |
| Density | ≥ 7.85 | g/cm3 |
| Elastic Modulus | ≥ 210 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| quenching | 840–860 °C | oil | — | Water possible for small sections |
| tempering | 540–660 °C | air | — | — |
| annealing | 640–680 °C | furnace | — | Soft annealing max 223 HB |
Compatibility verdict
35NiCr6 and 35NC6: 97% composition match
Close equivalents but NOT identical.
Related materials
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