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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SCM440 is a low-alloy steel with chromium and molybdenum as primary alloying elements. The chromium content (0.90-1.20%) enhances hardenability and provides moderate corrosion resistance, while molybdenum (0.15-0.30%) improves high-temperature strength and prevents temper brittleness. The balanced carbon content (0.38-0.43%) ensures optimal strength-to-toughness ratio.
Heat Treatment Processes
MetalZenith's heat treatment protocols include normalizing at 850-900°C, followed by air cooling. For hardening, austenitizing occurs at 830-870°C with oil quenching. Tempering temperatures range from 550-650°C depending on desired hardness levels. Our controlled atmosphere furnaces prevent decarburization and ensure uniform heating throughout the cross-section.
Manufacturing Excellence
Our production process begins with carefully selected raw materials melted in electric arc furnaces with secondary refining through ladle metallurgy. Continuous casting ensures homogeneous structure, followed by controlled rolling or forging to achieve desired mechanical properties. Advanced ultrasonic testing and magnetic particle inspection guarantee internal soundness.
Quality Standards Compliance
MetalZenith maintains strict adherence to JIS G4105 standards with additional compliance to ASTM A4140, EN 42CrMo4, and DIN 1.7225 specifications. Our quality management system includes statistical process control, traceability documentation, and comprehensive material test certificates (MTC 3.1) for every shipment, ensuring consistent quality and performance.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Silicon (Si) | 0.15 - 0.35 |
| Manganese (Mn) | 0.60 - 0.90 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.90 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.30 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 655 - 850 MPa | Quenched & Tempered |
| Yield Strength | ≥ 490 MPa | Quenched & Tempered |
| Elongation | ≥ 17% | 50mm gauge length |
| Reduction of Area | ≥ 45% | Quenched & Tempered |
| Hardness (HB) | 197 - 255 | Annealed |
| Hardness (HRC) | 28 - 35 | Quenched & Tempered |
| Impact Energy (Charpy V) | ≥ 54 J | Room Temperature |
| Fatigue Limit | 350 - 400 MPa | 107 cycles |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1416 - 1460°C | - |
| Thermal Conductivity | 42.6 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12.2×10-6/K | 20-100°C |
| Specific Heat Capacity | 486 J/kg·K | 20°C |
| Electrical Resistivity | 0.27 µΩ·m | 20°C |
| Young's Modulus | 210 GPa | 20°C |
| Poisson's Ratio | 0.27 - 0.30 | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, tubes, forgings | JIS G4105 |
| Round Bar Diameter | 6mm - 300mm | JIS G4051 |
| Square Bar Size | 10mm - 150mm | JIS G4051 |
| Plate Thickness | 6mm - 100mm | JIS G4105 |
| Length | Up to 12 meters (custom lengths available) | Customer specification |
| Surface Finish | Hot rolled, cold drawn, peeled, ground, machined | JIS G0601 |
| Dimensional Tolerance | h9, h11 (cold drawn), ±0.5mm (hot rolled) | JIS G3429 |
| Heat Treatment | Annealed, normalized, quenched & tempered | JIS G0201 |
| Testing Standards | JIS Z2241, JIS Z2242, JIS Z2280 | JIS G0404 |
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Our Advantages in Processing JIS SCM440
Advanced Vacuum Degassing Technology
MetalZenith employs cutting-edge vacuum degassing and ladle refining processes to achieve ultra-low sulfur and phosphorus content, resulting in superior steel cleanliness, enhanced fatigue resistance, and improved machinability for JIS SCM440 production.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities with advanced atmosphere control ensure consistent microstructure and mechanical properties. Multi-zone furnaces with precise temperature monitoring guarantee optimal hardenability and toughness in every batch of SCM440 steel.
Comprehensive Customization Services
MetalZenith offers extensive customization options including precision machining, surface treatments, and special dimensional requirements. Our technical team provides engineering support for application-specific modifications and maintains flexible production scheduling for urgent deliveries.
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