We manufacture forging ingots, billets, and blooms in alloy steel specifically for 51crv4, designed for high-strength, high-elasticity, and fatigue-resistant engineering applications. 51crv4 is a medium-high carbon chromium-vanadium alloy steel renowned for its excellent spring properties, high yield strength, and outstanding fatigue resistance. It is engineered to withstand repeated cyclic loading, shock, and vibration, making it an ideal choice for springs and highly stressed mechanical components. The addition of chromium improves hardenability and wear resistance, while vanadium refines grain structure, enhances strength, and improves fatigue life. 51crv4 offers excellent response to quenching and tempering and maintains good toughness and dimensional stability after heat treatment. This grade provides an optimal balance of strength, elasticity, and durability for demanding dynamic applications.
| Element | Content (%) | Function / effect |
| Carbon (c) | 0.47 – 0.55 | Provides high strength and hardness |
| Manganese (mn) | 0.70 – 1.10 | Improves hardenability and toughness |
| Silicon (si) | Max 0.40 | Increases elastic limit and strength |
| Chromium (cr) | 0.90 – 1.20 | Enhances hardenability and wear resistance |
| Vanadium (v) | 0.10 – 0.20 | Refines grain and improves fatigue resistance |
| Phosphorus (p) | Max 0.035 | Impurity; controlled to maintain toughness |
| Sulphur (s) | Max 0.035 | Impurity; controlled for machinability |
(Properties may vary depending on section size and heat treatment conditions)
Heat treatment parameters can be optimized to meet specific spring and dynamic load requirements.
51CrV4 has several international equivalents, including:
51crv4 is the preferred choice for springs and components subjected to continuous cyclic loading. Its high elastic limit, excellent fatigue resistance, and stable heat treatment response ensure long service life and reliable performance in demanding automotive and industrial applications.
| Grade | Carbon (%) | Key applications | Heat treatment | Comments |
| 51crv4 | 0.47 – 0.55 | Springs, suspension parts | Quenching & tempering | Excellent fatigue resistance |
| 50CrV4 | 0.47 – 0.55 | Spring steel applications | Quenching & tempering | Similar properties |
| En47 | 0.50 – 0.60 | Leaf and coil springs | Quenching & tempering | Common indian equivalent |
51crv4 is a high-performance chromium-vanadium alloy steel designed for springs and dynamic engineering applications. It delivers exceptional fatigue life, high strength, and consistent performance under repeated stress conditions.