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Technical Specifications
Product Overview
Metallurgical Characteristics
GB 20CrNiMo is a low-alloy steel with excellent hardenability due to its balanced chromium, nickel, and molybdenum content. The microstructure typically consists of tempered martensite or bainite after proper heat treatment, providing optimal strength-toughness combination. The nickel content enhances toughness and impact resistance, while chromium improves hardenability and wear resistance. Molybdenum additions prevent temper brittleness and enhance high-temperature strength.
Heat Treatment Process
MetalZenith employs controlled heat treatment cycles optimized for GB 20CrNiMo. Austenitizing is performed at 850-880°C followed by oil quenching to achieve martensitic transformation. Tempering at 550-650°C develops the desired strength-toughness balance. Our computer-controlled furnaces ensure uniform heating, precise temperature control, and consistent cooling rates throughout the cross-section.
Manufacturing Process Excellence
Production begins with electric arc furnace melting using high-quality raw materials, followed by ladle refining and vacuum degassing to achieve superior cleanliness. Continuous casting produces homogeneous billets with minimal segregation. Hot rolling or forging operations are performed within controlled temperature ranges to optimize grain structure and mechanical properties.
Quality Standards & Testing
All GB 20CrNiMo products undergo comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical property verification through tensile and impact testing, hardness measurement, and ultrasonic examination for internal soundness. Grain size analysis and microstructural evaluation ensure conformance to specifications. Complete mill test certificates accompany each shipment with full traceability documentation.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.17-0.23 |
| Silicon (Si) | 0.17-0.37 |
| Manganese (Mn) | 0.40-0.70 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 0.40-0.70 |
| Nickel (Ni) | 1.25-1.65 |
| Molybdenum (Mo) | 0.20-0.30 |
| Copper (Cu) | ≤ 0.25 |
| Aluminum (Al) | ≥ 0.015 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 980-1180 MPa | Quenched & Tempered |
| Yield Strength (0.2% offset) | ≥ 785 MPa | Quenched & Tempered |
| Elongation | ≥ 12% | 50mm gauge length |
| Reduction of Area | ≥ 45% | Standard test |
| Hardness (HB) | 293-352 | Quenched & Tempered |
| Impact Energy (KV) | ≥ 39 J | Room temperature |
| Fatigue Limit | 450-500 MPa | 10&sup7; cycles |
| Young's Modulus | 210 GPa | Room temperature |
🔬 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 | Room temperature |
| Curie Temperature | 770°C | - |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, tubes, forgings | GB/T 3077 |
| Round Bar Diameter | 10-500mm | GB/T 702 |
| Plate Thickness | 6-200mm | GB/T 709 |
| Length | Up to 12m (standard), custom lengths available | Customer specification |
| Surface Finish | Hot rolled, cold drawn, peeled, ground, machined | GB/T 3077 |
| Dimensional Tolerance | h9, h11 (bars), ±0.5mm (plates) | GB/T 702, GB/T 709 |
| Heat Treatment Condition | Annealed, normalized, quenched & tempered | Customer requirement |
| Testing Standards | GB/T 228, GB/T 229, GB/T 231 | National standards |
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Our Advantages in Processing GB 20CrNiMo
Advanced Vacuum Degassing Technology
MetalZenith utilizes state-of-the-art vacuum degassing and ladle refining systems to achieve ultra-low sulfur and phosphorus content in GB 20CrNiMo, resulting in superior cleanliness, improved fatigue resistance, and enhanced mechanical properties that exceed standard specifications.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities feature precise temperature monitoring and atmosphere control, ensuring optimal austenitizing, quenching, and tempering cycles that deliver consistent microstructure and mechanical properties with minimal variation across production batches.
Comprehensive Customization Capabilities
MetalZenith offers extensive customization options including specific chemical compositions, specialized heat treatments, precision machining, and various surface finishes. Our technical team works closely with customers to develop tailored solutions meeting exact application requirements and performance specifications.
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