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Technical Specifications
Product Overview
Metallurgical Characteristics
SUJ2 exhibits a martensitic microstructure after hardening with uniformly distributed chromium carbides that provide exceptional wear resistance. The high carbon content enables through-hardening to 60-65 HRC while maintaining adequate toughness for bearing applications. The controlled chromium content ensures optimal carbide formation without excessive brittleness.
Heat Treatment Process
MetalZenith employs controlled atmosphere hardening at 820-860°C followed by oil quenching and tempering at 150-200°C. Our vacuum furnaces ensure uniform heating and minimize decarburization. Specialized sub-zero treatment at -80°C transforms retained austenite for maximum dimensional stability in precision applications.
Advanced Manufacturing Process
Our production process includes vacuum induction melting, controlled forging with optimized reduction ratios, and stress-relief annealing. Advanced ESR (Electroslag Remelting) technology ensures exceptional cleanliness and homogeneity. Controlled cooling rates during spheroidizing annealing optimize carbide morphology for superior machinability.
Specialized Quality Testing
MetalZenith conducts comprehensive Rockwell hardness distribution mapping, X-ray diffraction analysis for residual austenite content (typically <3%), detailed carbide distribution evaluation using image analysis, and rotating bending fatigue testing per ASTM D7791. Ultrasonic inspection ensures internal soundness critical for bearing applications.
Application-Specific Technical Considerations
For bearing manufacturing, SUJ2 provides optimal contact fatigue resistance and dimensional stability under cyclic loading. In cutting tool applications, the uniform carbide distribution ensures consistent edge retention. Precision machinery components benefit from the excellent surface finish capability and minimal distortion during heat treatment. Automotive applications leverage the superior wear resistance and reliability under high-stress conditions.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95 - 1.10 |
| Chromium (Cr) | 1.30 - 1.60 |
| Manganese (Mn) | 0.50 - 0.80 |
| Silicon (Si) | 0.15 - 0.35 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Molybdenum (Mo) | ≤ 0.08 |
| Nickel (Ni) | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Hardness (HRC) | 60 - 65 |
| Compressive Strength (MPa) | ≥ 2500 |
| Impact Toughness (J) | 15 - 25 |
| Wear Resistance Index | Excellent (Grade A) |
| Hardenability (DI) | ≥ 80mm |
| Fatigue Strength (MPa) | 800 - 1000 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.81 |
| Melting Point (°C) | 1420 - 1460 |
| Thermal Conductivity (W/m·K) | 42.7 |
| Thermal Expansion (×10??/K) | 11.5 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Bars, Rods, Tubes, Forgings, Precision Ground Stock |
| Diameter Range | 10 - 300mm |
| Length Range | 1000 - 6000mm |
| Surface Finish | Hot Rolled, Cold Drawn, Precision Ground |
| Standards Compliance | JIS G4805, ASTM A295, ISO 683-17, DIN 100Cr6 |
| Heat Treatment Condition | Annealed, Spheroidized, Hardened & Tempered |
| Tolerance Class | h9, h11 (Cold Drawn), IT11 (Hot Rolled) |
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Our Advantages in Processing SUJ2
Advanced Vacuum Degassing Technology
MetalZenith utilizes advanced vacuum degassing and controlled atmosphere melting to minimize inclusions and achieve exceptional steel cleanliness. Our proprietary heat treatment process ensures uniform carbide distribution and optimal through-hardening characteristics essential for bearing steel performance.
Comprehensive Quality Testing Protocol
Our specialized testing includes Rockwell hardness mapping across sections, residual austenite content analysis, carbide distribution evaluation, and rotating bending fatigue testing. Advanced metallographic analysis ensures consistent microstructure and performance reliability in demanding applications.
Custom Processing & Technical Support
MetalZenith offers tailored heat treatment cycles, precision machining services, and comprehensive technical support. Our metallurgical experts provide application-specific recommendations for optimal performance in bearing manufacturing and precision tooling applications.
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