4150
Data verified4150 is a 0.50% carbon Cr-Mo steel for parts needing high Q&T strength and wear resistance: gun barrels, heavy gears and high-load shafts. Its EN counterpart 50CrMo4 (1.7228) carries the same chemistry concept.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.48–0.53 |
| Si | 0.15–0.35 |
| Mn | 0.75–1.00 |
| P | ≤0.035 |
| S | ≤0.040 |
| Cr | 0.80–1.10 |
| Mo | 0.15–0.25 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Hardness (Q&T) | 34–46 HRC typical |
| Tensile strength | 1000–1250 MPa (Q&T, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Normalize 860 °C; quench 840 °C oil; temper 450–600 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.7228 (50CrMo4) |
| aisi | 4150 |
| jis | SCM445 (near) |
| gb | 50CrMo |
Compare side by side: 4150 vs 4145
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Gun barrels, heavy gears and pinions, shafts, high-strength fasteners.
Processing: Machine annealed or prehardened; grinding after hardening; welding not recommended for critical parts.
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Ask for a quotationVisit NasteelSource: SAE J404 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.