14NiCrMo13-4
1.6657High-nickel case-hardening steel for heavily loaded large gears, shafts, and drivetrain components. Excellent core toughness with case hardness up to 62 HRC after carburizing. The high nickel content (3.0–3.5%) provides superior impact resistance even at low temperatures. Standard material for wind turbine gearboxes, heavy-duty industrial gears, and aerospace transmissions. Also known as EN36C (BS) and similar to SAE 9310.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 9310 | G93106 | REF |
| 🇬🇧 | BS | United Kingdom | EN36C / 832M13 | — | 95% |
| 🇺🇸 | AMS | USA | AMS 6263 | — | 93% |
Sources: ASTM cross-ref, BS 970, AMS spec
Chemical composition comparison (wt%)
Side-by-side: 14NiCrMo13-4 (EN) (EN 10084:2008) vs EN36C / 832M13 (BS)
| Element | 14NiCrMo13-4 (EN) | EN36C / 832M13 (BS) | Overlap |
|---|---|---|---|
| C | 0.11–0.17% | — | — |
| Si | ≤ 0.4% | — | — |
| Mn | 0.3–0.6% | — | — |
| P | ≤ 0.025% | — | — |
| S | ≤ 0.035% | — | — |
| Cr | 0.8–1.1% | — | — |
| Mo | 0.2–0.3% | — | — |
| Ni | 3–3.5% | — | — |
Mechanical properties
Case Hardened
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1100–1400 | MPa |
| Yield Strength | ≥ 850 | MPa |
| Elongation | ≥ 9 | % |
| Hardness HRC | 58–62 | HRC |
| Density | ≥ 7.85 | g/cm3 |
| Elastic Modulus | ≥ 210 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| carburizing | 880–930 °C | furnace | — | Case depth 0.8-2.0 mm typical |
| quenching | 820–850 °C | oil | — | After carburizing |
| tempering | 150–200 °C | air | — | Low-temperature temper to maintain case hardness |
| annealing | 640–680 °C | furnace | — | Soft annealing |
Compatibility verdict
14NiCrMo13-4 and EN36C / 832M13: 95% composition match
Close equivalents but NOT identical.
Related materials
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