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Technical Specifications
Product Overview
Metallurgical Characteristics
Key Steel Grade features a refined ferritic-pearlitic microstructure achieved through controlled rolling and optimized cooling rates. The balanced alloy composition with chromium, nickel, and molybdenum additions provides enhanced hardenability and improved atmospheric corrosion resistance. Grain refinement through microalloying elements ensures superior toughness and fatigue performance essential for structural applications.
Heat Treatment Process
MetalZenith employs controlled normalization at 880-920°C followed by air cooling to achieve optimal mechanical properties. For enhanced performance applications, quenching and tempering at 580-650°C provides superior strength-toughness balance. Our precise temperature control and cooling rate management ensure consistent microstructure and mechanical properties throughout the material cross-section.
Manufacturing Process Excellence
Our advanced production process includes electric arc furnace melting with secondary refining, continuous casting, and thermomechanical controlled processing (TMCP). Real-time monitoring of rolling parameters and cooling rates ensures optimal grain structure development and enhanced mechanical properties. Post-processing includes stress relieving and dimensional accuracy verification.
Specialized Quality Testing
Key Steel Grade undergoes comprehensive testing including weldability assessment per AWS D1.1, forming performance evaluation through bend testing, fatigue strength testing at 2×10? cycles, and atmospheric corrosion resistance testing per ASTM G101. Ultrasonic testing ensures internal soundness while Charpy V-notch testing validates impact toughness at service temperatures.
Application Engineering Considerations
For building construction, Key Steel Grade provides excellent weldability and forming characteristics essential for complex architectural designs. Bridge engineering applications benefit from superior fatigue resistance and atmospheric corrosion performance. Machinery manufacturing utilizes the material's high strength-to-weight ratio and dimensional stability. Vehicle construction applications leverage the steel's crashworthiness and forming capabilities, while general engineering projects benefit from versatile processing options and reliable performance characteristics.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.22 |
| Manganese (Mn) | 1.20 - 1.70 |
| Silicon (Si) | 0.20 - 0.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.30 - 0.80 |
| Nickel (Ni) | 0.20 - 0.50 |
| Molybdenum (Mo) | 0.15 - 0.35 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 355 |
| Tensile Strength (MPa) | 490 - 630 |
| Elongation (%) | ≥ 22 |
| Impact Energy at 0°C (J) | ≥ 27 |
| Hardness (HB) | 140 - 190 |
| Fatigue Strength (MPa) | 180 - 220 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1480 - 1520 |
| Thermal Conductivity (W/m·K) | 50.2 |
| Thermal Expansion (×10??/K) | 11.8 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Beams, Channels, Angles, Bars, Tubes |
| Thickness Range | 8 - 150mm |
| Width Range | 1200 - 3500mm |
| Length Range | 6000 - 15000mm |
| Standards Compliance | ASTM A572, ASTM A992, EN 10025, JIS G3106 |
| Heat Treatment Condition | Normalized, Quenched & Tempered |
| Surface Finish | Hot Rolled, Pickled, Shot Blasted |
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Our Advantages in Processing Key Steel Grade
Advanced Thermomechanical Processing
MetalZenith utilizes state-of-the-art controlled rolling and normalized heat treatment with precise temperature control to achieve optimal microstructure and enhanced mechanical properties. Our advanced processing ensures superior grain refinement and consistent strength-to-weight ratio throughout the material cross-section.
Comprehensive Structural Testing
Our Key Steel Grade undergoes extensive testing including weldability assessment, forming performance evaluation, fatigue strength testing, and atmospheric corrosion resistance analysis. This comprehensive testing ensures optimal performance in structural applications with superior joint integrity and long-term durability.
Custom Structural Solutions
MetalZenith provides tailored processing services including precision cutting, forming, and heat treatment optimization for specific structural requirements. Our technical team offers comprehensive engineering support for complex construction and machinery applications with customized material specifications.
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