20MnCrS5
1.7149Free-cutting variant of 20MnCr5 with controlled sulfur (0.020-0.040%). Improved machinability for high-volume gear production without significant loss of mechanical properties. The standard free-cutting case-hardening steel in European automotive gear manufacturing.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇪🇺 | EN | Europe | 20MnCrS5 | 1.7149 | 100% |
| 🇪🇺 | EN | Europe | 20MnCr5 (base) | 1.7147 | 95% |
Sources: EN 10084:2008, EN 10084
Chemical composition comparison (wt%)
Side-by-side: 20MnCrS5 (EN) (EN 10084:2008) vs 20MnCr5 (base) (EN) (EN 10084:2008)
| Element | 20MnCrS5 (EN) | 20MnCr5 (base) (EN) | Overlap |
|---|---|---|---|
| C | 0.17–0.22% | 0.17–0.22% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 1.1–1.4% | 1.1–1.4% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0.02–0.04% | 0.02–0.04% | OK |
| Cr | 1–1.3% | 1–1.3% | OK |
Mechanical properties
Carburized QT
| Property | Value | Unit |
|---|---|---|
| Hardness HRC | 58–62 | HRC |
As Received
| Property | Value | Unit |
|---|---|---|
| Hardness HB | ≤ 217 | HB |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| carburizing | 880–930 °C | — | Depends on case depth | Typical case depth 0.5-1.5mm |
| quenching | 810–840 °C | oil | min 30 min | Direct quench or reheat |
| tempering | 150–200 °C | air | 60-120 min | Low-temp temper for case-hardened parts |
Compatibility verdict
20MnCrS5 and 20MnCr5 (base): 95% 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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