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Technical Specifications
Product Overview
Metallurgical Characteristics
EN 18CrNiMo7-6 is a low-alloy case hardening steel with excellent hardenability due to its chromium, nickel, and molybdenum content. The steel exhibits a fine-grained martensitic structure in the case layer after carburizing and quenching, while maintaining a tough bainitic or tempered martensitic core structure. The molybdenum addition significantly improves hardenability and reduces temper brittleness.
Heat Treatment Process
MetalZenith's heat treatment process begins with carburizing at 900-950°C in a controlled carbon-rich atmosphere to achieve the desired case depth of 0.8-1.5mm. This is followed by direct quenching from carburizing temperature or reheat quenching from 820-850°C in oil or polymer quenchant. Final tempering is performed at 150-200°C to achieve optimal surface hardness of 58-62 HRC while maintaining core toughness.
Manufacturing Process
Our production process utilizes electric arc furnace melting followed by ladle refining and vacuum degassing to ensure chemical homogeneity and cleanliness. The steel is cast into continuous cast billets, then hot rolled to the required dimensions. Cold drawing and precision machining services are available for applications requiring tight dimensional tolerances and superior surface finish.
Quality Standards & Testing
All EN 18CrNiMo7-6 products manufactured by MetalZenith comply with EN 10084 standards and undergo comprehensive quality testing including chemical analysis by optical emission spectrometry, mechanical property verification, microstructural examination, and ultrasonic testing for internal soundness. Mill test certificates (3.1 according to EN 10204) are provided with each shipment, documenting full traceability and compliance with specified requirements.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.21 |
| Silicon (Si) | ≤ 0.40 |
| Manganese (Mn) | 0.50 - 0.90 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 1.50 - 1.80 |
| Nickel (Ni) | 1.40 - 1.70 |
| Molybdenum (Mo) | 0.25 - 0.35 |
| Aluminum (Al) | ≥ 0.020 |
| Copper (Cu) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength (Rm) | 980 - 1180 MPa | Quenched & Tempered |
| Yield Strength (Rp0.2) | ≥ 785 MPa | Quenched & Tempered |
| Elongation (A5) | ≥ 12% | Quenched & Tempered |
| Reduction of Area (Z) | ≥ 55% | Quenched & Tempered |
| Impact Energy (KV) | ≥ 60 J | At 20°C |
| Hardness (HB) | 302 - 363 HB | Quenched & Tempered |
| Surface Hardness | 58 - 62 HRC | Case Hardened |
| Case Depth | 0.8 - 1.5 mm | Carburized |
| Fatigue Limit | 450 - 500 MPa | 107 cycles |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1420 - 1460°C | - |
| Thermal Conductivity | 42 W/m·K | 20°C |
| Thermal Expansion Coefficient | 11.5×10-6/K | 20-100°C |
| Specific Heat Capacity | 460 J/kg·K | 20°C |
| Electrical Resistivity | 0.25 µΩ·m | 20°C |
| Young's Modulus | 210 GPa | 20°C |
| Poisson's Ratio | 0.27 - 0.30 | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, Square bars, Flat bars, Plates, Sheets, Forgings | EN 10084, DIN 17210 |
| Round Bar Diameter | 10 - 300 mm | EN 10060 |
| Square Bar Size | 10×10 - 150×150 mm | EN 10059 |
| Flat Bar Size | 10-100 mm thick, 20-300 mm wide | EN 10058 |
| Plate Thickness | 8 - 100 mm | EN 10025 |
| Length | 3000 - 12000 mm (custom lengths available) | Customer specification |
| Surface Finish | Hot rolled, Cold drawn, Peeled, Ground, Machined | EN 10221 |
| Tolerance Class | h9, h10, h11 (diameter), ±0.5mm (length) | ISO 286 |
| Heat Treatment Condition | Annealed, Normalized, Q&T, Case Hardened | EN 10084 |
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Our Advantages in Processing EN 18CrNiMo7-6
Advanced Vacuum Degassing Technology
MetalZenith employs state-of-the-art vacuum degassing systems during steel production, ensuring ultra-low inclusion content and superior cleanliness levels. This advanced process significantly enhances the fatigue resistance and overall mechanical properties of our EN 18CrNiMo7-6 steel.
Comprehensive Heat Treatment Services
Our integrated heat treatment facilities offer precise carburizing, quenching, and tempering services with computer-controlled atmosphere management. This ensures optimal case depth, hardness profiles, and core toughness tailored to specific application requirements.
Global Supply Chain & Custom Solutions
MetalZenith maintains strategic inventory locations worldwide and offers extensive customization capabilities including precision machining, surface treatments, and application-specific heat treatment cycles. Our technical team provides comprehensive engineering support from material selection to final application.
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