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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SUP7 is a medium-carbon, silicon-manganese spring steel with exceptional elastic properties and fatigue resistance. The high silicon content (1.5-2.0%) enhances elastic limit and resistance to tempering, while manganese improves hardenability and strength. The balanced composition provides optimal spring characteristics with excellent dimensional stability under cyclic loading.
Heat Treatment Process
MetalZenith employs controlled heat treatment processes including austenitizing at 850-900°C, followed by oil quenching and tempering at 400-500°C. This treatment achieves the desired hardness range of 38-45 HRC while maintaining excellent toughness and spring properties. Stress relieving at 200-250°C is recommended after forming operations.
Manufacturing Process
Our production process begins with electric arc furnace melting using high-purity raw materials, followed by ladle refining and continuous casting. Hot rolling is performed with controlled finishing temperatures to optimize microstructure. Cold drawing operations achieve precise dimensional tolerances and improved surface finish for critical applications.
Quality Standards & Testing
All JIS SUP7 products undergo comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical property testing per JIS Z2241, ultrasonic testing for internal soundness, and dimensional inspection. Fatigue testing and spring deflection analysis ensure performance reliability. Products are supplied with complete mill test certificates and traceability documentation.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.56-0.64 |
| Silicon (Si) | 1.50-2.00 |
| Manganese (Mn) | 0.70-1.00 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | ≤ 0.25 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 1275-1570 MPa |
| Yield Strength (0.2% offset) | ≥ 1080 MPa |
| Elongation | ≥ 8% |
| Reduction of Area | ≥ 25% |
| Hardness (HRC) | 38-45 |
| Impact Energy (Charpy V-notch) | ≥ 15 J |
| Fatigue Limit (10&sup7; cycles) | 550-650 MPa |
| Elastic Modulus | 206 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | 1480-1520°C |
| Thermal Conductivity (20°C) | 42 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 11.5×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity | 0.25 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 750°C |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Hot rolled bars, Cold drawn bars, Flat bars, Wire rod |
| Diameter Range (Round bars) | 6-300 mm |
| Thickness Range (Flat bars) | 3-80 mm |
| Width Range (Flat bars) | 20-300 mm |
| Length | 3-12 meters (or as required) |
| Standards | JIS G4801, ASTM A689, EN 10089 |
| Surface Finish | Hot rolled, Peeled, Ground, Polished |
| Dimensional Tolerance | h9, h10, h11 (as per ISO 286) |
| Heat Treatment Condition | Annealed, Normalized, Quenched & Tempered |
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Our Advantages in Processing JIS SUP7
Advanced Metallurgical Control
MetalZenith employs precision electric arc furnace technology with automated alloy addition systems, ensuring consistent silicon and manganese content within tight tolerances. Our controlled atmosphere processing prevents decarburization and optimizes grain structure for superior spring performance.
Comprehensive Quality Testing
Our ISO 17025 accredited laboratory conducts full chemical analysis, mechanical property testing, fatigue testing, and microstructural examination. Every batch undergoes spring deflection testing and stress relaxation analysis to guarantee performance reliability.
Flexible Supply Solutions
MetalZenith offers extensive customization capabilities including precision hot rolling, controlled cooling, and tailored heat treatment schedules. Our global logistics network ensures timely delivery with comprehensive technical support and engineering consultation services.
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