30CrMo4
1.7218Low-to-medium carbon Cr-Mo QT steel — lower C than 34CrMo4/42CrMo4 giving better weldability and toughness. THE gas cylinder and pressure vessel grade in Europe (EN ISO 9809). Good hardenability for medium sections. Also used for automotive crankshafts, gears, and high-pressure hydraulic components. AISI 4130 equivalent.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 4130 | — | REF |
| 🇪🇺 | EN | Europe | 30CrMo4 / 1.7218 | 1.7218 | 100% |
Sources: ASTM A29, EN 10083-3
Chemical composition comparison (wt%)
Side-by-side: 30CrMo4 (EN) (EN 10083-3) vs 30CrMo4 / 1.7218 (EN) (EN 10083-3)
| Element | 30CrMo4 (EN) | 30CrMo4 / 1.7218 (EN) | Overlap |
|---|---|---|---|
| C | 0.26–0.33% | 0.26–0.33% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.6–0.9% | 0.6–0.9% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0–0.035% | 0–0.035% | OK |
| Cr | 0.9–1.2% | 0.9–1.2% | OK |
| Mo | 0.15–0.3% | 0.15–0.3% | OK |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 800–950 | MPa |
| Yield Strength | 600–700 | MPa |
| Elongation | 14–18 | % |
| Hardness HB | 230–280 | HB |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Compatibility verdict
30CrMo4 and 30CrMo4 / 1.7218: 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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