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Technical Specifications
Product Overview
Metallurgical Characteristics
EN 50CrV4 is a low-alloy spring steel with a carefully balanced composition of chromium and vanadium additions. The chromium content (0.90-1.20%) enhances hardenability and provides moderate corrosion resistance, while vanadium (0.10-0.25%) acts as a strong carbide former, refining grain structure and improving fatigue resistance. The carbon content of 0.47-0.55% provides optimal balance between strength and ductility for spring applications.
Heat Treatment Process
MetalZenith's heat treatment process involves austenitizing at 860-880°C followed by oil quenching to achieve martensitic structure. Tempering is performed at 420-480°C to achieve the desired hardness range of 38-44 HRC. Our controlled atmosphere furnaces ensure uniform heating and prevent decarburization. Stress relieving at 200-250°C may be applied after machining to minimize residual stresses.
Manufacturing Process Excellence
Our production begins with electric arc furnace melting using premium scrap and alloy additions. Secondary refining through ladle metallurgy and vacuum degassing ensures low inclusion content and precise chemistry control. Continuous casting produces high-quality billets which are hot-rolled to final dimensions using computer-controlled rolling mills. Surface conditioning and dimensional inspection ensure compliance with international standards.
Quality Standards & Certifications
MetalZenith maintains ISO 9001:2015, ISO 14001:2015, and OHSAS 18001 certifications. Our quality management system includes incoming material inspection, in-process monitoring, and final product testing. Chemical analysis by optical emission spectroscopy, mechanical testing per ASTM/EN standards, ultrasonic testing for internal soundness, and dimensional verification ensure consistent quality. Mill test certificates and third-party inspection services are available upon request.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.47 - 0.55 |
| Silicon (Si) | 0.15 - 0.40 |
| Manganese (Mn) | 0.70 - 1.10 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Chromium (Cr) | 0.90 - 1.20 |
| Vanadium (V) | 0.10 - 0.25 |
| Nickel (Ni) | ≤ 0.40 |
| Copper (Cu) | ≤ 0.30 |
| Aluminum (Al) | ≤ 0.050 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength (Rm) | 1200 - 1400 MPa | Quenched & Tempered |
| Yield Strength (Rp0.2) | ≥ 1080 MPa | Quenched & Tempered |
| Elongation (A5) | ≥ 8% | Quenched & Tempered |
| Reduction of Area (Z) | ≥ 35% | Quenched & Tempered |
| Hardness (HRC) | 38 - 44 | Quenched & Tempered |
| Impact Energy (KV) | ≥ 25 J | At 20°C |
| Fatigue Limit | 550 - 650 MPa | 107 cycles |
| Young's Modulus | 210 GPa | At 20°C |
| Poisson's Ratio | 0.27 - 0.30 | At 20°C |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1420 - 1460°C | - |
| Thermal Conductivity | 42 W/m·K | 20°C |
| Thermal Expansion Coefficient | 11.5×10-6/K | 20-100°C |
| Specific Heat Capacity | 460 J/kg·K | 20°C |
| Electrical Resistivity | 0.25 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
| Curie Temperature | 760°C | - |
| Thermal Diffusivity | 11.6 mm²/s | 20°C |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, Square bars, Flat bars, Wire rod, Forged rings | EN 10089, ASTM A689 |
| Round Bar Diameter | 6 - 300 mm | EN 10060, ASTM A29 |
| Square Bar Size | 10 - 150 mm | EN 10059 |
| Flat Bar Dimensions | 10-200 mm width, 3-80 mm thickness | EN 10058 |
| Wire Rod Diameter | 5.5 - 42 mm | EN 10025, ASTM A510 |
| Length | 3 - 12 meters (standard), Custom lengths available | Customer specification |
| Surface Finish | Black, Peeled, Ground, Polished | Ra ≤ 3.2 µm |
| Dimensional Tolerance | h9, h10, h11 (bars), ±0.1 mm (wire) | EN ISO 286-2 |
| Delivery Condition | Annealed, Normalized, Q&T, As-rolled | Customer requirement |
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Our Advantages in Processing EN 50CrV4
Advanced Vacuum Degassing Technology
MetalZenith employs cutting-edge vacuum degassing and ladle refining processes to achieve ultra-low inclusion content and superior cleanliness in EN 50CrV4 production, resulting in enhanced fatigue life and reliability in critical spring applications.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities with precise temperature monitoring and atmosphere control ensure optimal microstructure development and consistent mechanical properties throughout the entire product range, meeting the most stringent quality requirements.
Comprehensive Customization Capabilities
MetalZenith offers extensive customization options including special dimensions, surface treatments, and tailored chemical compositions to meet specific customer requirements, supported by our experienced metallurgical engineering team and flexible production systems.
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