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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SUJ2 is a high-carbon, low-alloy steel specifically designed for bearing applications. The steel's microstructure consists of fine pearlite in the annealed condition, which transforms to martensite with retained austenite upon hardening. The chromium content provides enhanced hardenability and wear resistance, while maintaining excellent dimensional stability during heat treatment.
Heat Treatment Process
MetalZenith's controlled heat treatment process involves austenitizing at 820-860°C, followed by oil quenching to achieve full hardness. Tempering is performed at 150-200°C to achieve the desired hardness range of 60-65 HRC. Our advanced furnace technology ensures uniform heating and precise temperature control throughout the process, resulting in consistent mechanical properties and minimal distortion.
Manufacturing Process Excellence
Our production process begins with electric arc furnace melting, followed by ladle refining and vacuum degassing to achieve ultra-low inclusion content. The steel is cast into ingots or continuously cast billets, then hot rolled to the required dimensions. Cold drawing and precision grinding operations are available to achieve tight dimensional tolerances and superior surface finish.
Quality Standards & Testing
MetalZenith maintains strict adherence to JIS G 4805 standards and implements comprehensive quality control protocols. Every batch undergoes complete chemical analysis, mechanical testing, ultrasonic inspection, and magnetic particle testing. Our ISO 9001:2015 certified quality management system ensures consistent product quality and full traceability from raw materials to finished products. Additional testing services include fatigue testing, cleanliness evaluation, and microstructural analysis to meet specific customer requirements.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95 - 1.10 |
| Silicon (Si) | 0.15 - 0.35 |
| Manganese (Mn) | ≤ 0.50 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Chromium (Cr) | 1.30 - 1.60 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.25 |
| Aluminum (Al) | ≤ 0.050 |
| Oxygen (O) | ≤ 0.0015 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 2100 - 2400 MPa | Hardened & Tempered |
| Yield Strength | 1800 - 2100 MPa | Hardened & Tempered |
| Elongation | 8 - 12% | Hardened & Tempered |
| Hardness (HRC) | 60 - 65 | Hardened & Tempered |
| Hardness (HB) | ≤ 269 | Annealed |
| Impact Energy (Charpy V) | 15 - 25 J | Room Temperature |
| Fatigue Limit | 900 - 1100 MPa | 107 cycles |
| Young's Modulus | 210 GPa | Room Temperature |
| Poisson's Ratio | 0.27 - 0.30 | Room Temperature |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.81 g/cm³ | 20°C |
| Melting Point | 1480 - 1520°C | - |
| Thermal Conductivity | 42.6 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12.3×10-6/K | 20-100°C |
| Specific Heat Capacity | 460 J/kg·K | 20°C |
| Electrical Resistivity | 0.25 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | Room Temperature |
| Curie Temperature | 740°C | - |
| Thermal Diffusivity | 11.8 mm²/s | 20°C |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round Bars, Square Bars, Flat Bars, Wire Rod, Forged Rings | JIS G 4805 |
| Round Bar Diameter | 6mm - 300mm | JIS G 4805 |
| Square Bar Size | 10mm - 150mm | JIS G 4805 |
| Flat Bar Thickness | 5mm - 100mm | JIS G 4805 |
| Wire Rod Diameter | 5.5mm - 42mm | JIS G 3507 |
| Length | 3000mm - 12000mm (Custom lengths available) | Customer Specification |
| Surface Finish | Hot Rolled, Cold Drawn, Peeled, Ground | JIS G 4805 |
| Dimensional Tolerance | h9, h10, h11 (ISO 286) | ISO 286-2 |
| Heat Treatment Condition | Annealed, Normalized, Spheroidized | JIS G 4805 |
| Equivalent Standards | AISI 52100, EN 100Cr6, DIN 1.3505 | International |
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Our Advantages in Processing JIS SUJ2
Advanced Vacuum Degassing Technology
MetalZenith employs cutting-edge vacuum degassing and ladle refining processes to achieve ultra-low inclusion content and superior steel cleanliness. Our controlled atmosphere melting ensures exceptional bearing fatigue life and reliability in critical applications.
Comprehensive Quality Control System
Our ISO 9001:2015 certified facility features advanced testing capabilities including ultrasonic inspection, magnetic particle testing, and complete chemical analysis. Every batch undergoes rigorous mechanical testing to guarantee consistent performance and compliance with JIS G 4805 standards.
Global Supply Chain & Custom Solutions
MetalZenith offers flexible supply solutions with global distribution capabilities and custom processing services. We provide tailored heat treatment, precision machining, and specialized surface treatments to meet specific customer requirements and delivery schedules.
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