20 Years Experience | 1000+ Brand Partners | Full Customization
We have 20 years of industry experience, have partnered with over 1,000 brands, and support any customization needs.
Technical Specifications
Product Overview
Metallurgical Characteristics
GB 65Mn is a high-carbon manganese spring steel with a predominantly pearlitic microstructure in the annealed condition. The high carbon content (0.62-0.70%) provides excellent hardenability and strength, while manganese (0.90-1.20%) enhances hardenability, reduces critical cooling rate, and improves toughness. The steel exhibits excellent spring properties due to its ability to undergo significant elastic deformation without permanent set.
Heat Treatment Process
MetalZenith employs a carefully controlled heat treatment process for optimal performance. Austenitizing is performed at 830-860°C followed by oil quenching to achieve martensitic structure. Tempering at 420-480°C develops the desired combination of hardness (42-50 HRC) and toughness. Our computer-controlled furnaces ensure uniform heating and precise temperature control throughout the process.
Manufacturing Process
Production begins with electric arc furnace melting using high-quality raw materials. The molten steel undergoes ladle refining and vacuum degassing to minimize inclusions and achieve precise chemistry. Continuous casting produces billets which are hot rolled to intermediate sizes. Final dimensions are achieved through cold drawing or machining operations, followed by appropriate heat treatment and surface finishing.
Quality Standards & Testing
All GB 65Mn steel produced by MetalZenith complies with GB/T 1222 standards and international equivalents. Comprehensive testing includes chemical analysis by optical emission spectrometry, mechanical property evaluation, metallographic examination, and non-destructive testing. Fatigue testing ensures spring performance meets application requirements. Each shipment includes certified test reports and material traceability documentation.
Application Engineering
MetalZenith provides comprehensive technical support for GB 65Mn applications. Our engineering team assists with material selection, heat treatment optimization, and performance validation. We offer customized solutions for specific spring designs and can provide pre-formed components to customer specifications. Technical consultation includes stress analysis, fatigue life prediction, and failure analysis services.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.62-0.70 |
| Manganese (Mn) | 0.90-1.20 |
| Silicon (Si) | 0.17-0.37 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | ≤ 0.25 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 1275-1570 MPa |
| Yield Strength (0.2% offset) | ≥ 1080 MPa |
| Elongation (A5) | ≥ 8% |
| Reduction of Area | ≥ 25% |
| Hardness (HRC) | 42-50 |
| Impact Energy (Charpy V-notch) | ≥ 15 J |
| Fatigue Limit (10^7 cycles) | 550-650 MPa |
| Elastic Modulus | 206 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1460-1520°C |
| Thermal Conductivity (20°C) | 46 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 11.5×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.22 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, flat bars, square bars, wire, strip, plate |
| Round Bar Diameter | 6-300 mm |
| Flat Bar Dimensions | Thickness: 3-80 mm, Width: 20-300 mm |
| Wire Diameter | 0.5-20 mm |
| Strip Thickness | 0.3-6 mm |
| Length | 3-12 meters (or as required) |
| Surface Finish | Hot rolled, cold drawn, peeled, ground |
| Heat Treatment Condition | Annealed, normalized, quenched & tempered |
| Standards Compliance | GB/T 1222, JIS G4801, ASTM A689 |
| Dimensional Tolerance | h9-h11 (as per GB/T 4423) |
Let Us Create Success for Your Project
Professional Team, Premium Products, Complete Service - Your Project Success is Our Mission
Our Advantages in Processing GB 65Mn
Advanced Heat Treatment Technology
MetalZenith utilizes computer-controlled quenching and tempering systems with precise temperature monitoring to achieve optimal hardness and spring properties. Our multi-stage heat treatment process ensures uniform microstructure and superior fatigue life performance.
Comprehensive Quality Control System
Our state-of-the-art testing laboratory features spectrometers, universal testing machines, and fatigue testing equipment. Every batch undergoes rigorous chemical analysis, mechanical testing, and metallographic examination to guarantee consistent quality and performance.
Flexible Customization & Global Supply
MetalZenith offers extensive customization options including specific dimensions, surface treatments, and packaging requirements. Our global distribution network ensures reliable delivery worldwide with comprehensive technical support and engineering consultation services.
YOUR TRUSTED STEEL
MANUFACTURING PARTNER
Quick Inquiry
Industries We Serve
Professional steel solutions across major industries
Qualifications & Certifications
