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Technical Specifications
Product Overview
Metallurgical Characteristics
GB 42CrMo is a low-alloy steel with chromium and molybdenum as primary alloying elements, providing excellent hardenability and through-hardening properties. The chromium content enhances corrosion resistance and hardenability, while molybdenum improves high-temperature strength and reduces temper brittleness. The balanced carbon content ensures optimal strength-to-toughness ratio.
Heat Treatment Process
MetalZenith's heat treatment process involves austenitizing at 850-870°C followed by oil quenching to achieve martensitic structure. Tempering is performed at 550-650°C depending on required hardness levels. Our controlled atmosphere furnaces ensure uniform heating and prevent decarburization. Stress relieving at 600-650°C is recommended for machined components.
Manufacturing Process Excellence
Our production process begins with careful raw material selection and electric arc furnace melting with precise alloy addition control. Secondary refining through ladle furnace and vacuum degassing removes impurities and ensures chemical homogeneity. Continuous casting produces high-quality billets, followed by controlled rolling to achieve desired mechanical properties and grain structure.
Quality Standards and Testing
MetalZenith maintains strict quality control protocols including chemical analysis by optical emission spectroscopy, mechanical testing per ASTM and EN standards, ultrasonic testing for internal soundness, and dimensional inspection. All products are supplied with mill test certificates and full traceability documentation. Special testing including fatigue testing, fracture toughness, and corrosion testing available upon request.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38-0.45 |
| Silicon (Si) | 0.17-0.37 |
| Manganese (Mn) | 0.50-0.80 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 0.90-1.20 |
| Molybdenum (Mo) | 0.15-0.25 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.25 |
| Aluminum (Al) | ≥ 0.020 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 980-1180 MPa |
| Yield Strength (Rp0.2) | ≥ 785 MPa |
| Elongation (A5) | ≥ 12% |
| Reduction of Area (Z) | ≥ 45% |
| Hardness (HB) | 293-331 |
| Impact Energy (KV2) at 20°C | ≥ 63 J |
| Fatigue Limit (10^7 cycles) | 450-500 MPa |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.27-0.30 |
| Shear Modulus | 80 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1470-1520°C |
| Thermal Conductivity (20°C) | 42.6 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12.2×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.27 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity (20°C) | 11.8 mm²/s |
| Coefficient of Linear Expansion (20-200°C) | 12.8×10-6/K |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, tubes, forgings |
| Round Bar Diameter | 10-300 mm |
| Plate Thickness | 6-200 mm |
| Sheet Thickness | 0.5-6 mm |
| Length | Up to 12 meters (custom lengths available) |
| Standards | GB/T 3077, ASTM A29, EN 10083, JIS SCM440 |
| Surface Finish | Hot rolled, cold drawn, peeled, ground, machined |
| Heat Treatment Condition | Annealed, normalized, quenched and tempered |
| Dimensional Tolerance | h9, h10, h11 (custom tolerances available) |
| Straightness | ≤ 1mm/m |
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Our Advantages in Processing GB 42CrMo
Advanced Metallurgical Processing
MetalZenith employs cutting-edge electric arc furnace technology with secondary refining processes including ladle furnace treatment and vacuum degassing. This advanced metallurgical approach ensures superior chemical homogeneity, reduced inclusion content, and optimal microstructure control for enhanced mechanical properties.
Comprehensive Quality Control System
Our integrated quality management system features real-time spectroscopic analysis, automated mechanical testing, ultrasonic inspection, and dimensional verification. Every batch undergoes rigorous testing protocols with full traceability documentation, ensuring consistent quality and compliance with international standards.
Flexible Customization and Global Supply
MetalZenith offers extensive customization capabilities including specific heat treatment conditions, dimensional tolerances, and surface finishes. Our global distribution network and strategic inventory management ensure reliable supply chain performance with competitive lead times for both standard and custom specifications.
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