6150
Data verified6150 is a Cr-V spring steel: the vanadium refines grain and lifts fatigue strength, making it the premium choice for highly stressed springs, torsion bars and gears. EN 51CrV4 (1.8159) and GB 50CrVA are the same grade family.
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 | 0.80–1.10 |
| V | ≥0.15 |
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 | 1100–1350 MPa (Q&T, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Anneal 830–860 °C; quench 850–880 °C oil; temper 420–550 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.8159 (51CrV4) |
| aisi | 6150 |
| jis | SUP10 |
| gb | 50CrVA |
Compare side by side: 6150 vs 5160
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Valve springs (smaller), torsion bars, coil and leaf springs, gears, high-strength bolts.
Processing: Good spring practice — controlled decarburization and shot peening; machines annealed.
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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.