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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SUJ3 is a high carbon chromium bearing steel with exceptional hardenability and wear resistance characteristics. The steel's microstructure consists of fine pearlite in the annealed condition, transforming to martensite with retained austenite and carbide particles after proper heat treatment. The chromium content enhances hardenability and provides superior wear resistance, while the high carbon content ensures maximum hardness potential for bearing applications.
Heat Treatment Process
MetalZenith's proprietary heat treatment process involves controlled austenitizing at 820-860°C followed by oil quenching to achieve optimal hardness distribution. Tempering is performed at 150-200°C to relieve internal stresses while maintaining maximum hardness. Our precision-controlled atmosphere furnaces ensure uniform heating and prevent decarburization, critical for bearing steel performance.
Manufacturing Process Excellence
Our manufacturing process begins with carefully selected raw materials melted in electric arc furnaces followed by ladle refining and vacuum degassing. The steel undergoes continuous casting and subsequent hot rolling or forging to achieve desired dimensions. MetalZenith employs advanced non-destructive testing methods including ultrasonic inspection and magnetic particle testing to ensure internal soundness and surface integrity.
Quality Standards & Certifications
All JIS SUJ3 products manufactured by MetalZenith comply with JIS G4805 specifications and international equivalents including AISI 52100 and DIN 100Cr6. Our quality management system maintains ISO 9001:2015 certification with comprehensive traceability from raw material to finished product. Each batch undergoes rigorous chemical analysis, mechanical testing, and microstructural examination to ensure consistent quality and performance.
Technical Support & Engineering Services
MetalZenith provides comprehensive technical support including material selection guidance, heat treatment recommendations, and application-specific customization. Our metallurgical engineers work closely with customers to optimize material properties for specific bearing applications, ensuring maximum performance and service life in demanding operating conditions.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95 - 1.10 |
| Silicon (Si) | 0.15 - 0.35 |
| Manganese (Mn) | 0.20 - 0.50 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Chromium (Cr) | 1.30 - 1.60 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.25 |
| Molybdenum (Mo) | ≤ 0.08 |
| Aluminum (Al) | ≤ 0.050 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Annealed) | 735 - 835 MPa |
| Yield Strength (Annealed) | ≥ 440 MPa |
| Elongation (Annealed) | ≥ 12% |
| Reduction of Area (Annealed) | ≥ 35% |
| Hardness (Annealed) | ≤ 241 HB |
| Hardness (Quenched & Tempered) | 60 - 66 HRC |
| Impact Energy (Annealed) | ≥ 20 J |
| Fatigue Limit (Rotating Bending) | 350 - 400 MPa |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.27 - 0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.81 g/cm³ |
| Melting Point | 1420 - 1460°C |
| Thermal Conductivity (20°C) | 46 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 11.5×10-6/K |
| Thermal Expansion Coefficient (20-200°C) | 12.1×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.25 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 760°C |
| Thermal Diffusivity (20°C) | 12.8 mm²/s |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, Square bars, Flat bars, Plates, Sheets, Tubes, Forgings |
| Round Bar Diameter | 6mm - 300mm |
| Square Bar Size | 10mm - 150mm |
| Plate Thickness | 5mm - 100mm |
| Sheet Thickness | 0.5mm - 5mm |
| Length | Up to 6000mm (Custom lengths available) |
| Standards Compliance | JIS G4805, AISI 52100, DIN 100Cr6, EN 1.3505 |
| Surface Finish | Hot rolled, Cold drawn, Turned, Ground, Polished |
| Dimensional Tolerance | h9, h10, h11 (Custom tolerances available) |
| Heat Treatment Condition | Annealed, Normalized, Quenched & Tempered |
Let Us Create Success for Your Project
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Our Advantages in Processing JIS SUJ3
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting combined with electroslag remelting processes to achieve superior steel cleanliness and homogeneity. Our advanced melting technology eliminates inclusions and ensures consistent chemical composition throughout the entire steel matrix, resulting in enhanced bearing performance and extended service life.
Precision Heat Treatment Control
Our computer-controlled atmosphere heat treatment furnaces provide precise temperature uniformity within ±3°C, ensuring optimal microstructural development and consistent mechanical properties. MetalZenith's proprietary heat treatment protocols maximize hardness retention while maintaining dimensional stability critical for bearing applications.
Comprehensive Quality Testing & Customization
MetalZenith offers complete customization capabilities including specialized dimensions, surface finishes, and heat treatment conditions tailored to specific bearing applications. Our in-house testing laboratory performs ultrasonic inspection, chemical analysis, hardness testing, and microstructural examination to guarantee material integrity and performance specifications.
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