36NiCrMo16
1.6773Ultra-high-strength nickel-chromium-molybdenum QT steel. 4% Ni gives exceptional deep hardenability — air-hardening up to 90mm, through-hardening up to 300mm. UTS 1100-1300 MPa QT with good toughness. White-spot sensitive — dehydrogenation after forging mandatory. French designation 35NCD16. Used for landing gear, aerospace structural parts, heavy-duty shafts, racing components, and mining/construction equipment.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇪🇺 | EN | Europe | 36NiCrMo16 / 1.6773 | 1.6773 | 100% |
| 🇫🇷 | AFNOR | France | 35NCD16 | — | 100% |
Sources: EN 10083-3, AIR 9160/C
Chemical composition comparison (wt%)
Side-by-side: 36NiCrMo16 (EN) (EN 10083-3) vs 36NiCrMo16 / 1.6773 (EN) (EN 10083-3)
| Element | 36NiCrMo16 (EN) | 36NiCrMo16 / 1.6773 (EN) | Overlap |
|---|---|---|---|
| C | 0.32–0.39% | 0.32–0.39% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.5–0.8% | 0.5–0.8% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0–0.025% | 0–0.025% | OK |
| Cr | 1.6–2% | 1.6–2% | OK |
| Mo | 0.25–0.45% | 0.25–0.45% | OK |
| Ni | 3.6–4.1% | 3.6–4.1% | OK |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1100–1300 | MPa |
| Yield Strength | 900–1050 | MPa |
| Elongation | 9–12 | % |
| Hardness HB | 320–390 | HB |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| quenching | 830–860 °C | oil or polymer | — | Air-hardening possible up to 90mm diameter |
| tempering | 550–650 °C | air | — | Temper to target strength class |
Compatibility verdict
36NiCrMo16 and 36NiCrMo16 / 1.6773: 100% composition match
Close equivalents but NOT identical.
Related materials
50CrV4
1.8160Chromium-vanadium spring/tool steel — identical alloy system to 51CrV4 (1.8159) but recognized as a separate grade in some standards. Dual use: heavy-duty springs (EN 10089) AND cold work tools (knives, shear blades). V improves temper resistance and grain refinement. UTS 1200-1500 QT. Used for heavy leaf springs, stabilizer bars, torsion bars, and cold work cutting tools.
51CrMoV4
1.7701CrMoV alloyed spring steel — THE European automotive suspension spring material. CrMo gives deep hardenability for large coil springs, V adds grain refinement and secondary hardening for fatigue resistance. UTS 1350-1600 MPa QT. Used for hot-formed coil springs (cars, trucks), leaf springs, torsion bars, and stabilizer bars. Excellent sag resistance to 200°C.
20MnCr5
1.7147Manganese-chromium case-hardening steel with higher core strength than 16MnCr5. Used for heavily loaded gears, shafts, camshafts, and transmission components requiring high surface hardness with tough core. Popular in automotive and heavy machinery.
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