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Technical Specifications
Product Overview
Metallurgical Characteristics
EN 34CrMo4 is a low-alloy steel with excellent hardenability due to its chromium and molybdenum content. The chromium enhances hardenability and provides moderate corrosion resistance, while molybdenum improves high-temperature strength and prevents temper brittleness. The steel exhibits a fine-grained martensitic structure after quenching, which transforms to tempered martensite during tempering, providing optimal strength-toughness balance.
Heat Treatment Process
MetalZenith's controlled heat treatment process includes: Normalizing at 850-900°C followed by air cooling, stress relief annealing at 650-700°C, austenitizing at 850-880°C, oil or water quenching, and tempering at 550-650°C depending on required hardness. Our computer-controlled furnaces ensure precise temperature uniformity and atmosphere control throughout the heat treatment cycle.
Manufacturing Process
Production begins with electric arc furnace melting using premium scrap and alloy additions. Secondary refining through ladle metallurgy and vacuum degassing removes impurities and achieves precise chemistry. Continuous casting produces high-quality billets, which undergo controlled rolling in our precision mills. Advanced process control systems monitor temperature, reduction ratios, and cooling rates to optimize microstructure and mechanical properties.
Quality Standards & Testing
All EN 34CrMo4 products comply with EN 10083-3 specifications and undergo comprehensive testing including optical emission spectroscopy for chemical analysis, tensile testing per ASTM E8, Charpy impact testing per ASTM E23, hardness testing, and ultrasonic inspection for internal soundness. Metallographic examination verifies grain structure and inclusion ratings. Statistical process control ensures consistent quality across all production batches.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.30 - 0.37 |
| Silicon (Si) | ≤ 0.40 |
| Manganese (Mn) | 0.60 - 0.90 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 0.90 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.30 |
| Nickel (Ni) | ≤ 0.30 |
| Aluminum (Al) | ≥ 0.020 |
| Copper (Cu) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength (Rm) | 1000 - 1200 MPa | Quenched & Tempered |
| Yield Strength (Rp0.2) | ≥ 800 MPa | Quenched & Tempered |
| Elongation (A5) | ≥ 12% | Quenched & Tempered |
| Reduction of Area (Z) | ≥ 45% | Quenched & Tempered |
| Impact Energy (KV) | ≥ 35 J | At 20°C |
| Hardness (HB) | 302 - 363 HB | Quenched & Tempered |
| Hardness (HRC) | 32 - 38 HRC | Quenched & Tempered |
| Fatigue Limit | 450 - 550 MPa | 107 cycles |
| Young's Modulus | 210 GPa | At 20°C |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1480 - 1520°C | - |
| Thermal Conductivity | 42 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12.5×10-6/K | 20-100°C |
| Specific Heat Capacity | 460 J/kg·K | 20°C |
| Electrical Resistivity | 0.25 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
| Poisson's Ratio | 0.27 - 0.30 | 20°C |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, Square bars, Flat bars, Plates, Sheets, Forgings, Tubes |
| Round Bar Diameter | 10 - 500 mm |
| Square Bar Size | 10×10 - 200×200 mm |
| Plate Thickness | 8 - 200 mm |
| Sheet Thickness | 0.5 - 8 mm |
| Length | Up to 12 meters (custom lengths available) |
| Standards | EN 10083-3, DIN 17200, ASTM A829, JIS SCM440 |
| Surface Finish | Hot rolled, Cold drawn, Peeled, Ground, Machined |
| Tolerance | h9, h11 (precision tolerance available) |
| Heat Treatment | Annealed, Normalized, Quenched & Tempered |
| Testing | Mill Test Certificate, Third-party inspection available |
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Our Advantages in Processing EN 34CrMo4
Advanced Electric Arc Furnace Technology
MetalZenith utilizes cutting-edge electric arc furnace technology combined with ladle refining and vacuum degassing processes to achieve precise chemical composition control and exceptional steel cleanliness. Our advanced metallurgical processes ensure optimal grain structure and mechanical properties in every heat of EN 34CrMo4 produced.
Comprehensive Quality Control Systems
Our integrated quality management system features real-time process monitoring, automated testing equipment, and certified metallurgical laboratories. Every batch undergoes rigorous chemical analysis, mechanical testing, and non-destructive examination to guarantee compliance with EN 10083-3 and customer specifications.
Global Supply Chain & Custom Solutions
MetalZenith maintains strategic inventory locations worldwide and offers comprehensive customization services including precision machining, heat treatment, and surface finishing. Our technical support team provides engineering assistance for material selection and application optimization, ensuring optimal performance for each customer's specific requirements.
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