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Technical Specifications
Product Overview
Metallurgical Characteristics
Galvannealed steel features a zinc-iron intermetallic coating with a predominantly delta (FeZn??) and gamma (Fe?Zn??) phase structure. The controlled iron content (7-15%) in the coating creates a matte gray appearance and provides superior paint adhesion compared to conventional galvanized coatings. The base steel maintains a ferritic-pearlitic microstructure optimized for structural applications.
Galvannealing Process
MetalZenith employs continuous hot-dip galvanizing followed by controlled heating to 500-550°C in specialized galvannealing furnaces. This process promotes iron diffusion from the substrate into the zinc coating, forming the characteristic zinc-iron alloy layers essential for enhanced paintability and forming performance.
Advanced Manufacturing Process
Our state-of-the-art production line features precise atmosphere control, advanced coating weight management, and real-time quality monitoring. The process includes substrate preparation, flux application, zinc bath immersion, air knife coating control, and controlled galvannealing heat treatment to ensure consistent coating quality and mechanical properties.
Specialized Quality Testing
MetalZenith conducts comprehensive testing including welding performance evaluation using resistance spot welding and arc welding procedures, complex forming simulation through draw bead and stretch forming tests, fatigue strength analysis under cyclic loading conditions, and accelerated atmospheric corrosion testing including salt spray and cyclic corrosion protocols to validate long-term durability.
Structural Application Engineering
For building structural frameworks, our galvannealed steel provides optimal corrosion protection with excellent weldability for steel framing systems. In bridge construction, the superior atmospheric corrosion resistance extends service life while maintaining structural integrity. Automotive chassis applications benefit from enhanced formability and spot weldability. Industrial machinery frames utilize the combination of strength and paintability for equipment housings, while general engineering applications leverage the versatile processing characteristics for diverse fabrication requirements.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.25 |
| Manganese (Mn) | 0.30 - 1.50 |
| Silicon (Si) | ≤ 0.50 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.035 |
| Aluminum (Al) | 0.020 - 0.080 |
| Zinc Coating (Zn) | 85 - 93 |
| Iron in Coating (Fe) | 7 - 15 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | 280 - 550 |
| Tensile Strength (MPa) | 380 - 680 |
| Elongation (%) | ≥ 18 |
| Impact Energy at 0°C (J) | ≥ 27 |
| Hardness (HRB) | 65 - 85 |
| Bend Test (180°) | No Cracking |
🔬 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) | 11.8 |
| Elastic Modulus (GPa) | 200 |
| Coating Thickness (μm) | 7 - 25 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Coils, Sheets, Cut-to-Length Plates |
| Thickness Range | 0.4 - 6.0mm |
| Width Range | 600 - 2100mm |
| Coating Designation | GA40, GA60, GA90, GA140 |
| Standards Compliance | ASTM A653, ASTM A792, JIS G3302 |
| Surface Finish | Regular Spangle, Minimized Spangle |
| Strength Grades | Grade 33, 37, 40, 50, 55, 80 |
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Our Advantages in Processing Galvannealed Steel
Advanced Galvannealing Process Technology
MetalZenith utilizes precision-controlled galvannealing furnaces with real-time temperature monitoring and atmosphere control to achieve optimal zinc-iron alloy formation. Our advanced process ensures uniform coating distribution and consistent iron content (7-15%) for superior paint adhesion and forming characteristics.
Comprehensive Structural Performance Testing
Our quality assurance program includes specialized testing for structural applications: advanced welding performance evaluation, complex forming simulation testing, accelerated fatigue strength analysis, and extended atmospheric corrosion resistance testing to ensure optimal performance in demanding structural environments.
Custom Processing and Engineering Support
MetalZenith provides tailored galvannealed steel solutions with custom coating weights, specialized forming grades, and comprehensive technical support. Our engineering team offers application-specific recommendations for structural design, welding procedures, and surface preparation protocols.
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