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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SKH51 is a tungsten-molybdenum type high speed steel with excellent hot hardness and wear resistance. The steel features a complex carbide structure consisting primarily of MC (vanadium carbides), M6C (tungsten-molybdenum carbides), and M23C6 (chromium carbides) distributed in a tempered martensitic matrix. This carbide distribution provides exceptional cutting edge retention and thermal stability up to 600°C.
Heat Treatment Process
MetalZenith's optimized heat treatment involves preheating to 850°C, followed by austenitizing at 1210-1230°C in protective atmosphere. Quenching is performed in oil or air depending on section size, achieving uniform hardness of 64-66 HRC. Triple tempering at 540-580°C reduces hardness to the working range of 62-65 HRC while maximizing toughness and dimensional stability.
Manufacturing Excellence
Our production utilizes electric arc furnace melting with ladle refining, followed by vacuum degassing to minimize hydrogen content and non-metallic inclusions. The steel undergoes controlled cooling and stress relief annealing to achieve optimal machinability in the annealed condition. Advanced ultrasonic testing ensures internal soundness throughout all product forms.
Quality Standards
All JIS SKH51 production meets stringent quality requirements including chemical composition verification by optical emission spectroscopy, mechanical property testing per JIS G4403 standards, and microstructural analysis. MetalZenith maintains full traceability from raw materials through final inspection, providing comprehensive mill test certificates with each shipment. Our quality management system ensures consistent performance across all production batches.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.80-0.90 |
| Silicon (Si) | 0.20-0.45 |
| Manganese (Mn) | 0.15-0.40 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 3.80-4.50 |
| Molybdenum (Mo) | 4.50-5.50 |
| Tungsten (W) | 5.50-6.75 |
| Vanadium (V) | 1.75-2.20 |
| Cobalt (Co) | ≤ 0.50 |
| Nickel (Ni) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Annealed) | 850-950 MPa |
| Yield Strength (Annealed) | 550-650 MPa |
| Elongation (Annealed) | 12-18% |
| Reduction of Area (Annealed) | 25-35% |
| Hardness (Annealed) | 255-285 HB |
| Hardness (Hardened & Tempered) | 62-65 HRC |
| Impact Energy (Annealed) | 25-35 J |
| Fatigue Limit | 400-500 MPa |
| Modulus of Elasticity | 230 GPa |
| Poisson's Ratio | 0.27-0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 8.15 g/cm³ |
| Melting Point | 1480-1520°C |
| Thermal Conductivity (20°C) | 24 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 11.5×10-6/K |
| Thermal Expansion Coefficient (20-200°C) | 12.2×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.55 µΩ·m |
| Magnetic Permeability | Paramagnetic |
| Thermal Diffusivity | 6.4 mm²/s |
| Curie Temperature | Not Applicable |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Round bars, Square bars, Flat bars, Plates, Sheets, Forged blocks |
| Round Bar Diameter | 6-300 mm |
| Square Bar Size | 10×10 - 150×150 mm |
| Flat Bar Dimensions | 10-100 mm thick, 20-300 mm wide |
| Plate Thickness | 10-150 mm |
| Standard Length | 3000-6000 mm (custom lengths available) |
| Surface Finish | Hot rolled, Cold drawn, Turned, Ground |
| Dimensional Tolerance | h9-h11 (turned), ±0.5mm (hot rolled) |
| Standards Compliance | JIS G4403, ASTM A600, EN ISO 4957 |
| Delivery Condition | Annealed, Hardened & Tempered |
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Our Advantages in Processing JIS SKH51
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting combined with electroslag remelting processes to produce JIS SKH51 with exceptional cleanliness, minimal inclusion content, and uniform carbide distribution for superior cutting tool performance.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities ensure precise temperature control and atmosphere management, delivering consistent hardness levels and optimal microstructure while maintaining excellent toughness characteristics throughout the material cross-section.
Comprehensive Customization Services
MetalZenith offers extensive customization capabilities including precision machining, surface treatments, and special dimensional requirements. Our technical team provides application-specific recommendations and maintains flexible inventory management for just-in-time delivery worldwide.
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