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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS S65C is a eutectoid high-carbon steel with excellent hardenability and spring properties. The steel exhibits a pearlitic microstructure in the annealed condition, consisting of alternating layers of ferrite and cementite. Upon quenching from the austenitic temperature range (820-860°C), the steel transforms to martensite, providing maximum hardness and strength. Subsequent tempering at 400-500°C develops the optimal combination of strength, elasticity, and toughness required for spring applications.
Heat Treatment Process
MetalZenith employs controlled atmosphere furnaces for heat treatment operations. The recommended heat treatment cycle includes: austenitizing at 830-850°C, oil quenching to achieve 60-64 HRC, followed by tempering at 420-480°C to reach the desired hardness of 45-52 HRC. This process ensures optimal spring characteristics while maintaining adequate toughness and fatigue resistance. Stress relieving at 200-250°C may be performed after forming operations.
Manufacturing Process
Our production process begins with electric arc furnace melting using high-quality scrap and alloy additions. The molten steel undergoes ladle refining and vacuum degassing to minimize inclusions and achieve precise chemical composition. Continuous casting produces billets with excellent surface quality and internal soundness. Hot rolling and controlled cooling optimize the microstructure, while cold drawing operations provide superior dimensional accuracy and surface finish.
Quality Standards & Testing
MetalZenith maintains strict adherence to JIS G4801 specifications and international quality standards. Our comprehensive testing protocol includes chemical analysis by optical emission spectrometry, mechanical property verification through tensile and hardness testing, microstructural examination, and non-destructive testing for internal defects. Statistical process control ensures consistent quality, while traceability systems provide complete documentation from raw materials to finished products.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.62-0.68 |
| Silicon (Si) | 0.15-0.35 |
| Manganese (Mn) | 0.60-0.90 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | ≤ 0.25 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Annealed) | 735-834 MPa |
| Yield Strength (Annealed) | ≥ 441 MPa |
| Elongation (Annealed) | ≥ 12% |
| Reduction of Area | ≥ 35% |
| Hardness (Annealed) | 217-255 HB |
| Hardness (Quenched & Tempered) | 45-52 HRC |
| Impact Energy (Charpy V-notch) | ≥ 29 J |
| Fatigue Limit (10&sup7; cycles) | 350-400 MPa |
| Elastic Modulus | 206 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1460-1520°C |
| Thermal Conductivity (20°C) | 46 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 11.5×10-6/K |
| Specific Heat Capacity | 486 J/kg·K |
| Electrical Resistivity (20°C) | 0.18 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, flat bars, wire, strips, sheets |
| Round Bar Diameter | 6-200 mm |
| Flat Bar Dimensions | 10-100 mm thickness, up to 300 mm width |
| Wire Diameter | 0.5-12 mm |
| Sheet Thickness | 0.5-25 mm |
| Length | Up to 12 meters (cut to length available) |
| Surface Finish | Hot rolled, cold drawn, peeled, ground |
| Tolerance | h9, h10, h11 (ISO 286-2) |
| Standards | JIS G4801, ASTM A689, EN 10132-4 |
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Our Advantages in Processing JIS S65C
Advanced Heat Treatment Technology
MetalZenith employs computer-controlled induction heating and precision quenching systems to achieve optimal microstructure and mechanical properties in JIS S65C steel. Our multi-stage tempering process ensures consistent hardness distribution and superior spring characteristics throughout the material cross-section.
Comprehensive Quality Control Systems
Our integrated quality management includes real-time chemical composition monitoring, automated mechanical testing, and statistical process control. Every batch undergoes rigorous fatigue testing and dimensional verification to guarantee compliance with JIS G4801 standards and customer specifications.
Flexible Supply Chain Solutions
MetalZenith offers extensive customization capabilities including precision cutting, surface treatments, and packaging solutions. Our global distribution network and strategic inventory management ensure reliable delivery schedules while providing technical support for application-specific requirements and engineering consultation services.
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