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Technical Specifications
Product Overview
Metallurgical Characteristics
SCM440 exhibits a tempered martensitic microstructure after proper heat treatment, providing an optimal balance of strength, toughness, and ductility. The chromium-molybdenum alloying system enhances hardenability and provides excellent through-hardening capabilities, while maintaining good machinability and weldability for structural fabrication.
Heat Treatment Process
MetalZenith employs controlled austenitizing at 850-880°C followed by oil quenching and tempering at 550-650°C. This precise heat treatment cycle ensures optimal mechanical properties while minimizing residual stresses and distortion, critical for structural component dimensional stability.
Manufacturing Excellence
Our SCM440 production utilizes electric arc furnace melting with secondary refining processes including ladle furnace treatment and vacuum degassing. This advanced steelmaking ensures low inclusion content and superior cleanliness, resulting in enhanced fatigue performance and structural reliability.
Specialized Quality Testing
MetalZenith conducts comprehensive testing protocols specific to structural applications, including welding procedure qualification tests, bend testing for forming capability assessment, rotating beam fatigue testing, and salt spray corrosion testing to evaluate atmospheric corrosion resistance in various environmental conditions.
Structural Application Engineering
For building construction and bridge engineering, SCM440 provides excellent load-bearing capacity and seismic resistance. In machinery manufacturing, its superior fatigue strength ensures long service life under cyclic loading. For vehicle manufacturing, the steel's combination of strength and toughness delivers optimal crash performance and structural integrity. Our technical team provides application-specific guidance for welding procedures, joint design, and structural optimization across all engineering disciplines.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Manganese (Mn) | 0.60 - 0.85 |
| Silicon (Si) | 0.15 - 0.35 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.90 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.30 |
| Nickel (Ni) | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 835 |
| Tensile Strength (MPa) | 980 - 1180 |
| Elongation (%) | ≥ 12 |
| Impact Energy at 20°C (J) | ≥ 49 |
| Hardness (HRC) | 28 - 34 |
| Fatigue Strength (MPa) | 490 - 540 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1480 - 1520 |
| Thermal Conductivity (W/m·K) | 42.7 |
| Thermal Expansion (×10??/K) | 12.3 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Round Bars, Square Bars, Flat Bars, Plates, Forgings |
| Diameter Range | 10 - 300mm |
| Thickness Range | 8 - 80mm |
| Length Range | 3000 - 12000mm |
| Standards Compliance | JIS G4053, ASTM A29, DIN 1.7225 |
| Heat Treatment Condition | Quenched and Tempered |
| Surface Finish | Hot Rolled, Cold Drawn, Machined |
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Our Advantages in Processing SCM440 Steel
Advanced Heat Treatment Technology
MetalZenith utilizes precision-controlled quenching and tempering processes with computerized temperature monitoring to achieve optimal microstructural refinement in SCM440 steel. Our advanced heat treatment ensures uniform hardness distribution and enhanced mechanical properties throughout the material cross-section.
Comprehensive Structural Testing
Our SCM440 steel undergoes extensive testing protocols including welding performance evaluation, forming capability assessment, fatigue strength testing, and atmospheric corrosion resistance analysis. These specialized tests ensure optimal performance in demanding structural applications.
Custom Processing & Engineering Support
MetalZenith provides tailored processing solutions including custom heat treatment schedules, precision machining, and fabrication services. Our technical team offers comprehensive engineering support for structural design optimization and material selection guidance.
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