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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SUS440C is a high-carbon martensitic stainless steel with a complex microstructure consisting of martensite matrix with dispersed chromium carbides. The high carbon content (0.95-1.20%) enables exceptional hardness after heat treatment, while the chromium content (16-18%) provides adequate corrosion resistance. The steel exhibits excellent wear resistance due to the presence of hard M23C6 and M7C3 carbides.
Heat Treatment Process
MetalZenith employs precise heat treatment protocols for optimal performance. Annealing is performed at 850-900°C followed by slow cooling to achieve maximum softness for machining. Hardening involves austenitizing at 1010-1065°C, followed by oil or air quenching. Tempering at 150-200°C achieves maximum hardness (58-62 HRC), while higher tempering temperatures (300-500°C) provide improved toughness with slightly reduced hardness.
Manufacturing Process Excellence
Our production process begins with carefully selected raw materials melted in electric arc furnaces, followed by vacuum degassing and electroslag remelting for ultimate cleanliness. Hot rolling and forging operations are performed within precise temperature ranges to ensure optimal grain structure. Cold working processes include precision drawing, grinding, and machining to achieve tight dimensional tolerances and superior surface finish.
Quality Standards and Testing
MetalZenith maintains strict adherence to JIS G4303 standards and implements comprehensive quality control measures. Every production lot undergoes chemical analysis using optical emission spectrometry, mechanical testing including tensile, hardness, and impact tests, and metallographic examination. Non-destructive testing methods such as ultrasonic inspection and magnetic particle testing ensure internal soundness. Certificate of compliance and test reports are provided with each shipment.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95 - 1.20 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.00 - 18.00 |
| Molybdenum (Mo) | ≤ 0.75 |
| Nickel (Ni) | ≤ 0.60 |
| Copper (Cu) | ≤ 0.50 |
| Iron (Fe) | Balance |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Hardened & Tempered) | 1900 - 2100 MPa |
| Yield Strength (0.2% Offset) | ≥ 1650 MPa |
| Elongation (50mm gauge length) | 2 - 5% |
| Reduction of Area | 15 - 25% |
| Hardness (Hardened & Tempered) | 58 - 62 HRC |
| Hardness (Annealed) | ≤ 269 HB |
| Impact Energy (Charpy V-notch, 20°C) | 15 - 25 J |
| Fatigue Limit (107 cycles) | 800 - 900 MPa |
| Elastic Modulus | 200 - 210 GPa |
| Poisson's Ratio | 0.27 - 0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.70 g/cm³ |
| Melting Point | 1480 - 1530°C |
| Thermal Conductivity (20°C) | 24.2 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 10.4×10-6/K |
| Thermal Expansion Coefficient (20-300°C) | 11.2×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.60 µΩ·m |
| Magnetic Permeability (Hardened) | Ferromagnetic |
| Curie Temperature | Approximately 750°C |
| Thermal Diffusivity | 6.8×10-6 m²/s |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, flat bars, plates, sheets, strips, wire, forgings |
| Round Bar Diameter | 6mm - 300mm |
| Flat Bar Dimensions | 10×3mm to 150×50mm |
| Plate Thickness | 3mm - 100mm |
| Sheet Thickness | 0.5mm - 6mm |
| Wire Diameter | 0.1mm - 10mm |
| Standards Compliance | JIS G4303, ASTM A276, EN 10088-3 |
| Surface Finish | Hot rolled, cold drawn, ground, polished |
| Dimensional Tolerance | h9 to h11 (bars), ±0.1mm (sheets) |
| Length | Up to 6000mm (standard), custom lengths available |
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Our Advantages in Processing JIS SUS440C
Advanced Vacuum Melting Technology
MetalZenith utilizes state-of-the-art vacuum induction melting (VIM) and electroslag remelting (ESR) processes to produce ultra-clean JIS SUS440C steel with minimal inclusions, ensuring superior mechanical properties and enhanced fatigue resistance for critical applications.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities provide precise temperature and atmosphere control, enabling optimal austenitizing, quenching, and tempering cycles that achieve consistent hardness levels up to 60 HRC while maintaining excellent dimensional stability and minimizing distortion.
Comprehensive Customization Services
MetalZenith offers extensive customization capabilities including precision machining, surface treatments, and specialized heat treatment schedules. Our engineering team provides technical support for material selection and processing optimization to meet specific customer requirements and applications.
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