45NiCrMo16
1.6773Ultra-high-strength NiCrMo Q&T steel — Ni 3.5-4.5%, the highest-Ni standard QT grade. UTS 1250-1450 MPa. Maximum through-hardenability for the largest cross-sections (300mm+). Used for the heaviest crankshafts, large forged rotors, press columns, and critical structural forgings in energy and defense. Comparable to AISI 4340 but with higher Ni.
Chemical composition comparison (wt%)
Side-by-side: 45NiCrMo16 (EN) (EN 10083-3) vs ASTM
| Element | 45NiCrMo16 (EN) | ASTM | Overlap |
|---|---|---|---|
| C | 0.4–0.5% | — | — |
| Si | 0–0.4% | — | — |
| Mn | 0.5–0.8% | — | — |
| Cr | 1.2–1.5% | — | — |
| Mo | 0.2–0.35% | — | — |
| Ni | 3.5–4.5% | — | — |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1250–1450 | MPa |
| Yield Strength | 1050–1250 | MPa |
| Elongation | 7–10 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
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.
Not sure which material fits?
🤖 Ask AI Advisor →All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.