42CrMo4
Data verified42CrMo4 is the EN quenched-and-tempered Cr-Mo steel (1.7225), the European counterpart of AISI 4140 and one of the highest-volume engineering steels traded globally.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.38–0.45 |
| Si | ≤0.40 |
| Mn | 0.60–0.90 |
| P | ≤0.025 |
| S | ≤0.035 |
| Cr | 0.90–1.20 |
| Mo | 0.15–0.30 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Hardness (Q&T) | 28–40 HRC typical |
| Tensile strength | 900–1200 MPa (Q&T, EN 10083 size bands) |
| Density | 7.85 g/cm³ |
| Elastic modulus | 210 GPa |
Heat treatment
Quench 840–870 °C oil; temper 540–680 °C per EN 10083-3 property bands.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.7225 (42CrMo4) |
| aisi | 4140 |
| jis | SCM440 |
| gb | 42CrMo |
Compare side by side: 42CrMo4 vs 4140 · 42CrMo4 vs SCM440
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Automotive and machine shafts, gears, connecting rods, wind-energy bolts, cylinder tubes.
Processing: As 4140. EN supply is normally ordered to +QT condition with guaranteed property bands by ruling section.
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Ask for a quotationVisit NasteelSource: EN 10083-3 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.