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Technical Specifications
Product Overview
Metallurgical Characteristics
EN 1.2311 is a low-alloy steel with a tempered martensitic microstructure in the pre-hardened condition. The steel contains chromium and nickel for enhanced hardenability and toughness, with molybdenum additions for improved tempering resistance. MetalZenith's controlled cooling processes ensure uniform carbide distribution and optimal grain structure for superior machinability and dimensional stability.
Heat Treatment Processes
MetalZenith employs precise heat treatment protocols including austenitizing at 850-870°C, followed by controlled cooling and tempering at 580-620°C to achieve the specified hardness range. Our computer-controlled furnaces ensure uniform temperature distribution and precise atmosphere control, resulting in consistent mechanical properties and minimal distortion. For customer-specific applications, additional stress relieving at 550-580°C may be performed.
Manufacturing Excellence
Our integrated production facility utilizes electric arc furnace technology with secondary refining processes including ladle metallurgy and vacuum degassing. This ensures exceptional steel cleanliness with sulfur content below 0.005% and minimal non-metallic inclusions. MetalZenith's advanced forging and rolling capabilities provide superior grain flow and mechanical properties in all product directions.
Quality Standards & Testing
All EN 1.2311 products undergo comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical property verification, ultrasonic inspection for internal soundness, and dimensional verification. MetalZenith maintains full traceability from raw materials through final inspection, with complete mill test certificates provided for each shipment. Our quality management system complies with ISO 9001:2015, AS9100D, and NADCAP requirements for critical applications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.37-0.42 |
| Silicon (Si) | 0.20-0.40 |
| Manganese (Mn) | 1.40-1.70 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 1.80-2.10 |
| Nickel (Ni) | 0.90-1.20 |
| Molybdenum (Mo) | 0.15-0.25 |
| Aluminum (Al) | 0.020-0.050 |
| Copper (Cu) | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 1030-1180 MPa |
| Yield Strength (Rp0.2) | ≥ 835 MPa |
| Elongation (A5) | ≥ 12% |
| Reduction of Area (Z) | ≥ 45% |
| Hardness (Pre-hardened) | 28-32 HRC |
| Impact Energy (KV) | ≥ 25 J |
| Fatigue Limit | 450 MPa |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.27-0.30 |
| Shear Modulus | 81 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1420-1460°C |
| Thermal Conductivity (20°C) | 42 W/m·K |
| Thermal Expansion (20-100°C) | 12.1×10-6/K |
| Thermal Expansion (20-200°C) | 12.8×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity | 0.28 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Thermal Diffusivity | 11.6 mm²/s |
| Curie Temperature | 770°C |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Plates, Blocks, Bars, Forged Rounds |
| Plate Thickness | 10-300 mm |
| Plate Dimensions | Up to 3000×1500 mm |
| Round Bar Diameter | 20-500 mm |
| Square/Flat Bar | 20×20 to 300×300 mm |
| Length | Up to 6000 mm |
| Surface Finish | Black, Machined, Ground, Polished |
| Dimensional Tolerance | ±0.1 mm (Precision), ±0.5 mm (Standard) |
| Standards Compliance | EN 10083-3, ASTM A681, JIS SKT4 |
| Heat Treatment Condition | Pre-hardened (28-32 HRC), Annealed |
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Our Advantages in Processing EN 1.2311
Advanced Vacuum Degassing Technology
MetalZenith employs state-of-the-art vacuum degassing and ladle refining processes to achieve exceptional steel cleanliness with minimal inclusions. Our controlled atmosphere melting technology ensures superior homogeneity and consistent mechanical properties throughout the material cross-section.
Precision Heat Treatment Control
Our automated heat treatment facilities utilize computer-controlled furnaces with precise temperature monitoring and uniform cooling systems. This ensures consistent hardness distribution of 28-32 HRC in the pre-hardened condition, eliminating the need for customer heat treatment and reducing lead times.
Global Supply Chain & Customization
MetalZenith maintains strategic inventory locations worldwide and offers comprehensive customization services including precision machining, surface treatments, and dimensional tolerances to ±0.1mm. Our technical support team provides application engineering assistance and material selection guidance.
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