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Technical Specifications
Product Overview
Metallurgical Characteristics
EN 100CrMo7 is a through-hardening bearing steel with exceptional hardenability due to its chromium and molybdenum content. The high carbon content (0.95-1.05%) provides the necessary hardness for bearing applications, while chromium (1.35-1.65%) enhances wear resistance and hardenability. Molybdenum (0.15-0.25%) improves toughness and reduces temper brittleness, making this steel ideal for high-stress bearing applications.
Heat Treatment Process
MetalZenith's proprietary heat treatment process begins with spheroidizing annealing at 750-780°C to optimize machinability. Hardening is performed at 820-860°C followed by oil quenching to achieve martensitic structure. Tempering at 150-200°C provides the optimal balance of hardness (60-64 HRC) and toughness. Controlled cooling rates and atmosphere management ensure minimal distortion and optimal microstructure.
Manufacturing Process
Production begins with electric arc furnace melting followed by ladle metallurgy for precise chemistry control. Vacuum degassing removes hydrogen and reduces inclusion content. Continuous casting or ingot casting is followed by hot rolling or forging to achieve desired dimensions. MetalZenith's controlled cooling and heat treatment processes ensure consistent properties throughout the material cross-section.
Quality Standards & Testing
All EN 100CrMo7 products undergo comprehensive testing including chemical analysis, mechanical property verification, ultrasonic inspection, and cleanliness rating per ASTM E45. Fatigue testing validates bearing life performance. MetalZenith maintains full traceability from raw materials through final inspection, with certificates of compliance provided for all shipments. Our quality management system ensures consistent performance meeting international bearing industry standards.
🧪 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) | ≤ 0.015 |
| Chromium (Cr) | 1.35 - 1.65 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.25 |
| Aluminum (Al) | ≤ 0.050 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Annealed) | 750 - 950 MPa |
| Yield Strength (Annealed) | ≥ 450 MPa |
| Elongation (Annealed) | ≥ 10% |
| Reduction of Area (Annealed) | ≥ 35% |
| Hardness (Annealed) | ≤ 255 HB |
| Hardness (Hardened & Tempered) | 60 - 64 HRC |
| Impact Energy (Annealed, 20°C) | ≥ 25 J |
| Fatigue Limit (Rotating Bending) | 450 - 550 MPa |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.27 - 0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1420 - 1460°C |
| Thermal Conductivity (20°C) | 42 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 | 11.6 mm²/s |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Round bars, square bars, flat bars, forged rings, tubes, wire |
| Round Bar Diameter | 10 - 500 mm |
| Square Bar Size | 10×10 - 200×200 mm |
| Flat Bar Dimensions | Thickness: 5-100 mm, Width: 20-300 mm |
| Wire Diameter | 0.5 - 20 mm |
| Length | Up to 12 meters (standard), custom lengths available |
| Surface Finish | Black, turned, ground, polished |
| Dimensional Tolerance | h9 to h11 (standard), h6 to h8 (precision) |
| Standards Compliance | EN 10132-4, ASTM A295, JIS G4805, DIN 17230 |
| Heat Treatment Condition | Annealed, spheroidized, hardened & tempered |
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Our Advantages in Processing EN 100CrMo7
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting (VIM) and vacuum arc remelting (VAR) processes to produce EN 100CrMo7 with exceptional cleanliness and homogeneity. Our controlled atmosphere melting eliminates inclusions and ensures optimal carbide distribution for superior bearing performance.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities feature multi-zone furnaces with precise temperature monitoring and atmosphere control. MetalZenith's proprietary quenching and tempering processes achieve consistent hardness profiles and optimal microstructure for maximum fatigue life and dimensional stability.
Comprehensive Testing & Customization
MetalZenith provides complete material characterization including cleanliness rating, grain size analysis, and fatigue testing. We offer custom chemistry modifications, specialized heat treatments, and precision machining services to meet specific application requirements with full traceability documentation.
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