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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SKH9 is a tungsten-type high speed steel with a complex carbide structure consisting primarily of M6C (tungsten-rich) and MC (vanadium-rich) carbides distributed in a martensitic matrix. The high tungsten content (17.5-19.0%) provides exceptional hot hardness and wear resistance, while vanadium carbides contribute to superior cutting edge retention. The steel exhibits excellent red hardness, maintaining cutting performance at temperatures up to 600°C.
Heat Treatment Process
MetalZenith's optimized heat treatment cycle begins with preheating to 450-500°C, followed by austenitizing at 1280-1300°C in protective atmosphere. Quenching is performed in oil, salt bath, or air depending on section size. Triple tempering at 550-570°C ensures optimal secondary hardness and dimensional stability. Our computer-controlled furnaces maintain temperature uniformity within ±3°C throughout the process.
Manufacturing Process Excellence
Production begins with vacuum induction melting (VIM) of premium raw materials, followed by electroslag remelting (ESR) for enhanced cleanliness. Hot forging and rolling operations are performed within controlled temperature ranges to optimize carbide distribution. Advanced powder metallurgy routes are available for critical applications requiring maximum homogeneity and fine carbide structure.
Quality Standards & Testing
Every production batch undergoes comprehensive testing including optical emission spectroscopy for chemical analysis, Rockwell and Brinell hardness testing, metallographic examination for carbide distribution, and ultrasonic inspection for internal soundness. Mechanical property verification includes tensile testing, impact testing, and transverse rupture strength evaluation. All products are supplied with material test certificates traceable to international standards including JIS G4403, ASTM A600, and DIN EN ISO 4957.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.70-0.80 |
| Silicon (Si) | ≤ 0.45 |
| Manganese (Mn) | ≤ 0.40 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 3.80-4.50 |
| Tungsten (W) | 17.50-19.00 |
| Vanadium (V) | 1.00-1.40 |
| Cobalt (Co) | ≤ 0.50 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Hardness (HRC) | 63-66 | Hardened & Tempered |
| Hardness (HB) | ≤ 269 | Annealed |
| Tensile Strength | 3800-4200 MPa | Hardened & Tempered |
| Compressive Strength | ≥ 4500 MPa | Hardened & Tempered |
| Transverse Rupture Strength | 3200-3800 MPa | Hardened & Tempered |
| Impact Toughness (Charpy V) | 15-25 J | Hardened & Tempered |
| Fatigue Limit | 1800-2200 MPa | 10&sup7; cycles |
| Young's Modulus | 230 GPa | Room Temperature |
| Poisson's Ratio | 0.27-0.30 | Room Temperature |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 8.67 g/cm³ | 20°C |
| Melting Point | 1450-1480°C | - |
| Thermal Conductivity | 24 W/m·K | 20°C |
| Thermal Conductivity | 28 W/m·K | 400°C |
| Specific Heat Capacity | 460 J/kg·K | 20°C |
| Thermal Expansion Coefficient | 11.5×10-6/K | 20-100°C |
| Thermal Expansion Coefficient | 12.8×10-6/K | 20-400°C |
| Electrical Resistivity | 0.65 µΩ·m | 20°C |
| Magnetic Permeability | 1.005-1.02 | Hardened |
| Curie Temperature | 760°C | - |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, flat bars, plates, sheets, forgings, powder | JIS G4403 |
| Round Bar Diameter | 6-300 mm | JIS G4403 |
| Flat Bar Thickness | 8-100 mm | JIS G4403 |
| Flat Bar Width | 20-300 mm | JIS G4403 |
| Plate Thickness | 10-150 mm | JIS G4403 |
| Standard Length | 1000-6000 mm (custom lengths available) | Customer specification |
| Surface Finish | Hot rolled, cold drawn, ground, machined | Ra 0.8-6.3 µm |
| Dimensional Tolerance | h9-h11 (round), ±0.1-0.5 mm (flat) | JIS B0401 |
| Heat Treatment Condition | Annealed, hardened & tempered, soft annealed | Customer specification |
| Quality Standards | JIS G4403, ASTM A600, DIN EN ISO 4957 | International standards |
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Our Advantages in Processing JIS SKH9
Advanced Vacuum Melting Technology
MetalZenith employs vacuum induction melting (VIM) and electroslag remelting (ESR) processes to achieve exceptional cleanliness and homogeneity in JIS SKH9 production. Our controlled atmosphere melting eliminates inclusions and ensures uniform carbide distribution, resulting in superior tool performance and extended service life.
Precision Heat Treatment Excellence
Our state-of-the-art heat treatment facilities feature computer-controlled furnaces with precise temperature uniformity (±3°C). Advanced quenching systems and tempering processes ensure consistent hardness profiles and optimal microstructure, delivering reliable mechanical properties across all product dimensions.
Comprehensive Customization Capabilities
MetalZenith offers extensive customization options including precision machining, surface treatments, and special heat treatment cycles. Our global supply chain network ensures rapid delivery of standard and custom JIS SKH9 products, supported by technical consultation and application engineering services.
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