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Technical Specifications
Product Overview
Metallurgical Characteristics
GB 20CrMnTi is a low-carbon alloy steel specifically engineered for case hardening applications. The steel's composition features chromium for enhanced hardenability, manganese for improved strength and toughness, and titanium for grain refinement and carbide formation control. The low carbon content (0.17-0.23%) ensures excellent core toughness while maintaining sufficient carbon potential for effective case hardening through carburizing processes.
Heat Treatment Process
The optimal heat treatment cycle begins with carburizing at 900-930°C for 4-8 hours depending on required case depth, followed by direct quenching from carburizing temperature or re-austenitizing at 820-850°C. Quenching is performed in oil or polymer solutions to achieve target hardness. Tempering at 150-200°C relieves internal stresses while maintaining surface hardness. Case depths of 0.8-2.0mm are typically achievable with proper carburizing parameters.
Manufacturing Process
MetalZenith produces GB 20CrMnTi through electric arc furnace melting followed by ladle refining and vacuum degassing to achieve optimal cleanliness levels. Continuous casting ensures homogeneous chemical distribution, while controlled rolling and cooling processes optimize grain structure and mechanical properties. Advanced quality control includes ultrasonic testing, magnetic particle inspection, and comprehensive chemical and mechanical property verification.
Quality Standards & Certifications
All GB 20CrMnTi products comply with GB/T 3077 national standards and are manufactured under ISO 9001:2015 quality management systems. Material certificates include complete chemical analysis, mechanical property test results, heat treatment records, and dimensional inspection reports. Additional certifications available include EN 10204 3.1 mill test certificates and customer-specific quality requirements.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.17-0.23 |
| Silicon (Si) | 0.17-0.37 |
| Manganese (Mn) | 0.80-1.10 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 1.00-1.30 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.25 |
| Titanium (Ti) | 0.04-0.10 |
| Aluminum (Al) | ≥ 0.015 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 980-1180 MPa | Quenched & Tempered |
| Yield Strength | ≥ 785 MPa | Quenched & Tempered |
| Elongation | ≥ 12% | Quenched & Tempered |
| Reduction of Area | ≥ 45% | Quenched & Tempered |
| Hardness (Core) | 28-35 HRC | Quenched & Tempered |
| Surface Hardness | 58-62 HRC | Case Hardened |
| Impact Energy (Charpy V) | ≥ 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 | 0.22 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
| Curie Temperature | 770°C | - |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, forgings | GB/T 3077 |
| Round Bar Diameter | 10-300 mm | GB/T 702 |
| Square Bar Size | 10×10 to 150×150 mm | GB/T 702 |
| Plate Thickness | 6-100 mm | GB/T 3274 |
| Length | 3000-12000 mm (standard), custom lengths available | Customer specification |
| Surface Finish | Hot rolled, cold drawn, peeled, ground, machined | GB/T 3203 |
| Dimensional Tolerance | h9, h11 (bars), ±0.5mm (plates) | GB/T 1804 |
| Heat Treatment Condition | Annealed, normalized, quenched & tempered | GB/T 3077 |
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Our Advantages in Processing GB 20CrMnTi
Advanced Electric Arc Furnace Technology
MetalZenith utilizes cutting-edge electric arc furnace systems with precise temperature control and advanced ladle metallurgy for optimal chemical composition and cleanliness. Our secondary refining processes including vacuum degassing ensure minimal inclusion content and superior steel purity for enhanced mechanical properties.
Comprehensive Quality Control Systems
Our integrated quality management system features real-time spectroscopic analysis, automated mechanical testing, and advanced non-destructive examination techniques. Every heat undergoes rigorous testing protocols with full traceability documentation, ensuring consistent quality and compliance with international standards.
Flexible Customization & Global Supply
MetalZenith offers extensive customization capabilities including specific chemical modifications, precision machining, and heat treatment services. Our global distribution network and strategic inventory locations ensure reliable supply chain management with competitive lead times for customers worldwide.
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