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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SUP9 is a medium-carbon, low-alloy spring steel with chromium and vanadium additions that provide enhanced hardenability and grain refinement. The vanadium content forms fine carbides that improve wear resistance and fatigue strength, while chromium enhances hardenability and corrosion resistance. The steel exhibits excellent through-hardening properties and maintains consistent mechanical properties across varying section sizes.
Heat Treatment Process
MetalZenith's heat treatment process involves austenitizing at 850-880°C followed by oil quenching to achieve martensitic structure. Tempering is performed at 400-500°C depending on desired hardness levels. Our controlled atmosphere furnaces ensure uniform heating and prevent decarburization. Stress relieving at 200-250°C may be applied after forming operations to minimize residual stresses.
Manufacturing Process
Production begins with electric arc furnace melting followed by ladle refining and vacuum degassing to achieve optimal cleanliness. Continuous casting produces billets that undergo hot rolling to intermediate sizes. Cold drawing operations provide precise dimensional control and improved surface finish. MetalZenith's advanced process control systems monitor temperature, chemistry, and mechanical properties throughout production.
Quality Standards & Testing
All JIS SUP9 products undergo comprehensive testing including chemical analysis via optical emission spectroscopy, tensile testing, hardness verification, and fatigue testing. Ultrasonic inspection ensures internal soundness. MetalZenith maintains full traceability from raw materials through final inspection, providing certificates of compliance with JIS G4801 and customer specifications. Our quality management system ensures consistent product performance and reliability.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.52-0.60 |
| Silicon (Si) | 0.15-0.35 |
| Manganese (Mn) | 0.70-1.00 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.65-0.95 |
| Vanadium (V) | 0.15-0.25 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 1275-1570 MPa |
| Yield Strength (0.2% offset) | ≥ 1080 MPa |
| Elongation | ≥ 8% |
| Reduction of Area | ≥ 35% |
| Hardness (HRC) | 38-45 |
| Impact Energy (Charpy V-notch) | ≥ 25 J |
| Fatigue Limit (107 cycles) | 550-650 MPa |
| Young's Modulus | 206 GPa |
| Shear Modulus | 82 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1420-1460°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 (20°C) | 0.25 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Round bars, flat bars, wire, strips, plates |
| Round Bar Diameter | 6-200 mm |
| Flat Bar Dimensions | Thickness: 3-50 mm, Width: 20-300 mm |
| Wire Diameter | 0.5-12 mm |
| Standard Lengths | 3-12 meters (custom lengths available) |
| Surface Finish | Hot rolled, cold drawn, peeled, ground |
| Dimensional Tolerance | h9-h11 (cold drawn), ±0.5mm (hot rolled) |
| Standards Compliance | JIS G4801, ASTM A689, EN 10089 |
| Heat Treatment Condition | Annealed, normalized, quenched & tempered |
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Our Advantages in Processing JIS SUP9
Advanced Vacuum Degassing Technology
MetalZenith employs cutting-edge vacuum degassing and ladle refining processes to minimize sulfur and phosphorus content, ensuring superior fatigue life and enhanced spring performance in demanding applications.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities with precise temperature monitoring and atmosphere control guarantee consistent hardness distribution and optimal microstructure for maximum spring elasticity and durability.
Comprehensive Testing & Customization
MetalZenith provides extensive mechanical testing, fatigue analysis, and custom sizing capabilities, delivering JIS SUP9 products tailored to specific application requirements with full material traceability and certification.
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