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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 tempered 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 hardenability and can achieve uniform hardness throughout substantial cross-sections.
Heat Treatment Process
MetalZenith's optimized heat treatment process begins with annealing at 850-900°C followed by slow cooling to achieve maximum machinability. Hardening involves austenitizing at 1010-1065°C in controlled atmosphere, followed by oil or air quenching. Tempering is performed at 150-200°C for maximum hardness or 200-300°C for improved toughness, depending on application requirements.
Manufacturing Process Excellence
Our manufacturing process employs electric arc furnace melting followed by ladle refining and vacuum degassing to minimize harmful elements. Secondary refining through electroslag remelting ensures exceptional cleanliness and homogeneity. Hot working is performed within the temperature range of 1150-850°C, followed by controlled cooling to optimize microstructure.
Quality Standards & Testing
Every batch undergoes comprehensive testing including optical emission spectroscopy for chemical analysis, tensile and hardness testing, microstructural examination, and ultrasonic testing for internal soundness. MetalZenith maintains full traceability from raw materials through final inspection, ensuring compliance with international aerospace and medical device standards including AS9100D and ISO 13485.
🧪 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 MPa |
| Yield Strength (0.2% Offset) | ≥ 1650 MPa |
| Elongation (50mm gauge length) | ≥ 2% |
| Reduction of Area | ≥ 15% |
| 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 |
| Young's Modulus | 200 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 450°C |
| Thermal Diffusivity | 6.8×10-6 m²/s |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, strips, tubes, forgings |
| Round Bar Diameter | 6mm - 300mm |
| Plate Thickness | 3mm - 100mm |
| Sheet Thickness | 0.5mm - 6mm |
| Strip Thickness | 0.1mm - 3mm |
| Tube Outer Diameter | 10mm - 200mm |
| Length | Up to 6000mm (custom lengths available) |
| Surface Finish | Hot rolled, cold drawn, ground, polished, pickled |
| Heat Treatment Condition | Annealed, hardened & tempered, solution treated |
| Dimensional Tolerance | ±0.1mm to ±0.5mm (depending on form and size) |
| Standards Compliance | JIS G4303, ASTM A276, EN 10088-3, GB/T 1220 |
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Our Advantages in Processing JIS SUS440C
Advanced Vacuum Melting Technology
MetalZenith employs cutting-edge vacuum induction melting (VIM) and electroslag remelting (ESR) processes to achieve ultra-low inclusion content and superior cleanliness in JIS SUS440C production. This advanced technology ensures exceptional fatigue life and reliability in critical bearing applications.
Precision Heat Treatment Control
Our state-of-the-art heat treatment facilities feature computer-controlled furnaces with precise atmosphere control, enabling optimal austenitizing, quenching, and tempering cycles. This ensures consistent hardness distribution and dimensional stability throughout the entire cross-section of JIS SUS440C components.
Comprehensive Customization Capabilities
MetalZenith offers extensive customization options for JIS SUS440C, including specialized chemical compositions, custom heat treatment specifications, and precision machining services. Our global supply chain and flexible production capabilities ensure timely delivery of tailored solutions to meet specific application requirements.
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