100CrMn6
1.3520Through-hardening bearing steel with higher Mn than 100Cr6 for improved hardenability in larger cross-sections. Used for bearing rings, rolling elements, and precision components where 100Cr6 cannot achieve sufficient core hardness due to section size.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 52100 (approx) | — | REF |
| 🇪🇺 | EN | Europe | 100CrMn6 | 1.3520 | 100% |
Sources: ASTM A295, EN ISO 683-17
Chemical composition comparison (wt%)
Side-by-side: 100CrMn6 (EN) (EN ISO 683-17) vs 100CrMn6 (EN) (EN ISO 683-17)
| Element | 100CrMn6 (EN) | 100CrMn6 (EN) | Overlap |
|---|---|---|---|
| C | 0.9–1.05% | 0.9–1.05% | OK |
| Si | 0.45–0.75% | 0.45–0.75% | OK |
| Mn | 1–1.2% | 1–1.2% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0–0.015% | 0–0.015% | OK |
| Cr | 1.35–1.65% | 1.35–1.65% | OK |
| Mo | 0–0.1% | 0–0.1% | OK |
Mechanical properties
Hardened Tempered
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 58–64 | HRC |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.81 | g/cm3 |
Annealed
| Property | Value | Unit |
|---|---|---|
| Hardness HB | ≤ 230 | HB |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| quenching | 830–860 °C | oil | 15-30 min | Higher Mn = better oil-quench hardenability than 100Cr6 |
| tempering | 150–200 °C | air | 1-2 hours | Low temper for bearing hardness 58-64 HRC |
| annealing | 770–810 °C | furnace | 2-4 hours | Slow furnace cool ≤20°C/hour to 650°C |
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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