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Technical Specifications
Product Overview
Metallurgical Characteristics
M4 tool steel exhibits a complex carbide structure with primary MC carbides (vanadium-rich) and secondary M6C carbides (molybdenum-tungsten rich) uniformly distributed in a martensitic matrix. The high vanadium content provides exceptional wear resistance, while the molybdenum-tungsten combination ensures superior hot hardness and thermal stability at elevated cutting temperatures.
Heat Treatment Process
MetalZenith employs controlled atmosphere hardening at 1200-1230°C followed by multiple tempering cycles at 540-580°C to achieve optimal hardness-toughness balance. Our proprietary heat treatment protocols include preheating stages and controlled cooling rates to minimize distortion and maximize dimensional stability.
Advanced Manufacturing Process
MetalZenith utilizes vacuum induction melting followed by electroslag remelting to ensure superior cleanliness and carbide distribution. Our powder metallurgy route provides enhanced carbide uniformity and eliminates segregation issues common in conventional cast and wrought tool steels.
Specialized Quality Testing
Comprehensive quality assessment includes Rockwell hardness distribution mapping across cross-sections, X-ray diffraction analysis for residual austenite content (typically <3%), scanning electron microscopy for carbide distribution evaluation, and rotating beam fatigue testing to ensure reliability in cyclic loading applications.
Application-Specific Technical Considerations
For cutting tool applications, M4's superior hot hardness retention at 600°C makes it ideal for high-speed machining. In die and mold manufacturing, the excellent through-hardening capability ensures uniform properties in large sections. For bearing applications, the fine carbide structure provides exceptional rolling contact fatigue resistance. In precision machinery, the dimensional stability and wear resistance ensure long-term accuracy. For automotive components, the combination of toughness and wear resistance meets demanding performance requirements.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 1.25 - 1.35 |
| Chromium (Cr) | 3.75 - 4.50 |
| Molybdenum (Mo) | 4.25 - 5.50 |
| Tungsten (W) | 5.25 - 6.75 |
| Vanadium (V) | 3.75 - 4.50 |
| Silicon (Si) | 0.20 - 0.45 |
| Manganese (Mn) | 0.15 - 0.40 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Hardness (HRC) | 64 - 67 |
| Compressive Strength (MPa) | ≥ 4200 |
| Impact Toughness (J) | 15 - 25 |
| Wear Resistance Index | 8.5 - 9.2 |
| Hardenability (mm) | ≥ 75 |
| Transverse Rupture Strength (MPa) | ≥ 3800 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 8.25 |
| Melting Point (°C) | 1320 - 1370 |
| Thermal Conductivity (W/m·K) | 22.5 |
| Thermal Expansion (×10??/K) | 10.8 |
| Elastic Modulus (GPa) | 230 |
| Specific Heat (J/kg·K) | 460 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Bars, Rods, Plates, Forgings, Powder |
| Diameter Range | 6 - 300mm |
| Thickness Range | 3 - 80mm |
| Length Range | 100 - 6000mm |
| Standards Compliance | ASTM A600, DIN 1.3351, JIS SKH51 |
| Heat Treatment Condition | Annealed, Hardened & Tempered |
| Surface Finish | Ground, Machined, Polished |
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Our Advantages in Processing M4 Tool Steel
Advanced Vacuum Melting Technology
MetalZenith utilizes vacuum induction melting and electroslag remelting processes with precise temperature control to achieve optimal carbide distribution and eliminate inclusions. Our advanced metallurgical processing ensures superior tool performance and extended service life in demanding applications.
Comprehensive Quality Testing
MetalZenith conducts extensive quality testing including Rockwell hardness distribution mapping, residual austenite content analysis, carbide distribution evaluation, and fatigue strength testing. Our rigorous testing protocols ensure consistent tool performance and reliability in precision manufacturing applications.
Custom Heat Treatment Services
MetalZenith offers specialized heat treatment services tailored to specific application requirements, including custom hardening cycles, tempering optimization, and surface treatment solutions. Our technical support team provides comprehensive guidance for optimal tool performance and manufacturing efficiency.
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