5150
Data verified5150 is a medium-high carbon chromium steel used for stronger springs, axles and gears. It is the chromium-step between plain 1050 and the full spring grade 5160.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.48–0.53 |
| Si | 0.15–0.35 |
| Mn | 0.70–0.90 |
| P | ≤0.035 |
| S | ≤0.040 |
| Cr | 0.70–0.90 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Hardness (Q&T) | 30–42 HRC typical |
| Tensile strength | 900–1150 MPa (Q&T, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Normalize 860 °C; quench 840–860 °C oil; temper 450–600 °C (spring duty at lower end).
Equivalent grades
| Standard | Designation |
|---|---|
| din | 50Cr4 type (near) |
| aisi | 5150 |
| jis | SCr445 (near) |
| gb | 50Cr |
Compare side by side: 5150 vs 5160 · 5150 vs 5140
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Leaf springs (light), axles, gears, torsion bars, bolts.
Processing: Machines annealed; induction hardening responds well; weld with high preheat only.
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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.