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Technical Specifications
Product Overview
Metallurgical Characteristics
GB GCr15 is a through-hardening bearing steel with high carbon content (0.95-1.05%) and chromium addition (1.30-1.65%) that provides excellent hardenability and wear resistance. The steel exhibits a martensitic microstructure after quenching, with fine carbide distribution that contributes to superior rolling contact fatigue resistance.
Heat Treatment Process
MetalZenith employs precise heat treatment protocols including austenitizing at 840-860°C, followed by oil quenching to achieve uniform hardness. Tempering is performed at 150-200°C to relieve internal stresses while maintaining high hardness (60-67 HRC). Our controlled atmosphere furnaces prevent decarburization and ensure consistent surface quality.
Manufacturing Process
Our production process begins with electric arc furnace melting followed by ladle refining and vacuum degassing to achieve ultra-low inclusion content. Continuous casting ensures homogeneous chemical composition, while subsequent hot rolling and controlled cooling optimize the microstructure. Advanced quality control includes ultrasonic testing, chemical analysis, and mechanical property verification.
Quality Standards & Compliance
MetalZenith's GB GCr15 production complies with international standards including GB/T 18254, AISI 52100, and EN 100Cr6. Our ISO 9001:2015 certified quality management system ensures consistent product quality through statistical process control, comprehensive testing protocols, and full traceability from raw materials to finished products.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95-1.05 |
| Silicon (Si) | 0.15-0.35 |
| Manganese (Mn) | 0.25-0.45 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.020 |
| Chromium (Cr) | 1.30-1.65 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.25 |
| Aluminum (Al) | ≤ 0.050 |
| Oxygen (O) | ≤ 0.0015 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Annealed) | 785-835 MPa |
| Yield Strength (Annealed) | ≥ 440 MPa |
| Elongation (Annealed) | ≥ 10% |
| Reduction of Area (Annealed) | ≥ 35% |
| Hardness (Annealed) | ≤ 241 HB |
| Hardness (Hardened & Tempered) | 60-67 HRC |
| Impact Energy (Annealed) | ≥ 12 J |
| Fatigue Limit (Rotating Bending) | 380-420 MPa |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.27-0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1480-1520°C |
| Thermal Conductivity (20°C) | 46.6 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 |
| Thermal Diffusivity | 12.9 mm²/s |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, flat bars, plates, sheets, tubes, forgings |
| Round Bar Diameter | 6-300 mm |
| Flat Bar Dimensions | 10-100 mm thickness, up to 300 mm width |
| Plate Thickness | 8-150 mm |
| Length | Up to 12 meters (custom lengths available) |
| Standards | GB/T 18254, AISI 52100, EN 100Cr6, JIS SUJ2 |
| Surface Finish | Hot rolled, cold drawn, turned, ground, polished |
| Tolerance | h9, h10, h11 (custom tolerances available) |
| Heat Treatment Condition | Annealed, normalized, hardened & tempered |
| Testing Certificates | Mill test certificate, EN 10204 3.1/3.2 |
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Our Advantages in Processing GB GCr15
Advanced Vacuum Degassing Technology
MetalZenith utilizes state-of-the-art vacuum degassing and ladle refining processes to achieve ultra-low inclusion content and exceptional steel cleanliness, resulting in superior fatigue life and reliability in critical bearing applications.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities with precise temperature monitoring and controlled cooling rates ensure optimal carbide distribution and microstructure uniformity, delivering consistent hardness and dimensional stability across all product forms.
Comprehensive Testing & Customization
MetalZenith provides extensive material testing including ultrasonic inspection, magnetic particle testing, and microstructure analysis. We offer custom sizing, surface finishing, and heat treatment specifications to meet specific application requirements.
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