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Technical Specifications
Product Overview
Metallurgical Characteristics
SPA H steel features a fine-grained ferritic-pearlitic microstructure with controlled precipitation of copper-rich phases and chromium carbides. The strategic addition of copper, chromium, phosphorus, and nickel creates a protective patina layer that significantly reduces atmospheric corrosion rates compared to conventional structural steels. This weathering mechanism forms a dense, adherent oxide layer that acts as a barrier against further corrosion.
Heat Treatment Process
MetalZenith employs controlled rolling at temperatures between 850-950°C followed by controlled cooling to achieve optimal grain refinement and precipitation distribution. The thermomechanical processing parameters are precisely controlled to ensure uniform mechanical properties while maintaining excellent weldability and formability characteristics essential for structural applications.
Manufacturing Process Excellence
Our advanced production process includes continuous casting with electromagnetic stirring, followed by controlled rolling with precise temperature monitoring. MetalZenith's quality control system ensures consistent chemical composition and mechanical properties through real-time process monitoring and statistical process control methods.
Specialized Quality Testing
SPA H steel undergoes comprehensive testing including weldability assessment per JIS Z3158 standards, forming performance evaluation through bend testing and deep drawing tests, fatigue strength testing under cyclic loading conditions, and accelerated atmospheric corrosion testing in salt spray and industrial atmosphere environments to validate long-term performance.
Structural Application Considerations
For building structures, SPA H provides excellent strength-to-weight ratio with reduced maintenance requirements. In bridge engineering, the weathering characteristics eliminate the need for protective coatings in many environments. For machinery manufacturing, the steel offers superior fatigue resistance and dimensional stability. In vehicle construction, it provides weight reduction opportunities while maintaining structural integrity. General engineering applications benefit from the combination of high strength, good weldability, and long-term durability.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Manganese (Mn) | 0.20 - 0.50 |
| Silicon (Si) | 0.25 - 0.75 |
| Phosphorus (P) | 0.07 - 0.15 |
| Sulfur (S) | ≤ 0.035 |
| Copper (Cu) | 0.25 - 0.40 |
| Chromium (Cr) | 0.30 - 1.25 |
| Nickel (Ni) | ≤ 0.65 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 355 |
| Tensile Strength (MPa) | 490 - 610 |
| Elongation (%) | ≥ 18 |
| Impact Energy at 0°C (J) | ≥ 27 |
| Hardness (HB) | 140 - 200 |
| Fatigue Strength (MPa) | ≥ 160 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1510 - 1540 |
| Thermal Conductivity (W/m·K) | 50.2 |
| Thermal Expansion (×10??/K) | 12.0 |
| Elastic Modulus (GPa) | 206 |
| Electrical Resistivity (μΩ·m) | 0.17 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Structural Sections, Bars |
| Thickness Range | 4 - 100mm |
| Width Range | 1000 - 3500mm |
| Length Range | 6000 - 16000mm |
| Standards Compliance | JIS G3114, ASTM A588, EN 10155 |
| Heat Treatment Condition | Hot Rolled or Normalized |
| Surface Condition | Mill Scale, Shot Blasted, or Pickled |
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Our Advantages in Processing SPA H Steel
Advanced Weathering Steel Technology
MetalZenith utilizes precise alloying control with copper, chromium, and nickel to achieve optimal weathering characteristics. Our controlled rolling process ensures uniform microstructure and enhanced protective oxide layer formation, providing superior atmospheric corrosion resistance without compromising structural integrity.
Comprehensive Performance Testing
Our SPA H steel undergoes extensive testing including weldability evaluation per JIS Z3158, forming performance assessment, fatigue strength testing up to 2×10? cycles, and accelerated atmospheric corrosion testing. This ensures optimal performance in structural applications requiring long-term durability.
Custom Structural Solutions
MetalZenith provides tailored processing services including precision cutting, forming, and heat treatment optimization. Our technical team offers comprehensive support for structural design applications, ensuring optimal material selection and processing parameters for specific project requirements.
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