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Technical Specifications
Product Overview
Metallurgical Characteristics
EN 10169 Grade A represents a low-carbon, aluminum-killed steel specifically designed for continuous hot-dip galvanizing processes. The steel substrate features a ferritic microstructure with excellent formability characteristics, achieved through controlled rolling and precise chemical composition management. The aluminum content ensures effective deoxidation and grain refinement, while the low carbon content promotes superior deep-drawing properties.
Manufacturing Process
MetalZenith employs advanced steelmaking techniques including electric arc furnace melting, ladle refining, and continuous casting to produce high-quality steel slabs. The hot rolling process utilizes controlled cooling strategies to achieve optimal mechanical properties and surface quality. The continuous hot-dip galvanizing line operates at precisely controlled temperatures (450-460°C) with zinc bath chemistry management to ensure uniform coating application and excellent coating adhesion.
Heat Treatment and Processing
The steel undergoes continuous annealing in a reducing atmosphere at temperatures between 700-750°C, followed by rapid cooling to achieve the desired microstructure and mechanical properties. The galvanizing process involves surface preparation through alkaline cleaning, flux treatment, and immersion in molten zinc at 460°C. Post-coating treatments include air knife wiping for coating weight control and chromate passivation for enhanced corrosion resistance.
Quality Standards and Testing
MetalZenith maintains strict adherence to EN 10169 specifications through comprehensive quality control protocols. Testing procedures include chemical analysis via optical emission spectroscopy, mechanical property evaluation through tensile and bend testing, coating weight verification using magnetic thickness gauges, and corrosion resistance assessment through salt spray testing per ASTM B117. Surface quality inspection utilizes automated optical systems to detect coating defects and ensure consistent appearance.
Corrosion Protection Mechanism
The zinc coating provides both barrier and sacrificial protection to the steel substrate. The coating forms a protective zinc carbonate layer when exposed to atmospheric conditions, significantly extending service life in various environments. The coating weight options (Z100-Z350) allow optimization for specific corrosion resistance requirements, with heavier coatings providing enhanced protection for severe exposure conditions.
🧪 Chemical Composition
| Element | Content (%) | Specification |
|---|---|---|
| Carbon (C) | ≤ 0.12 | Maximum |
| Manganese (Mn) | ≤ 0.60 | Maximum |
| Silicon (Si) | ≤ 0.50 | Maximum |
| Phosphorus (P) | ≤ 0.030 | Maximum |
| Sulfur (S) | ≤ 0.025 | Maximum |
| Aluminum (Al) | ≥ 0.020 | Minimum (killed steel) |
| Nitrogen (N) | ≤ 0.009 | Maximum |
| Titanium (Ti) | ≤ 0.15 | Maximum (if added) |
| Niobium (Nb) | ≤ 0.09 | Maximum (if added) |
⚙️ Mechanical Properties
| Property | Value | Test Method |
|---|---|---|
| Yield Strength (ReH) | 140-180 MPa | EN ISO 6892-1 |
| Tensile Strength (Rm) | 270-350 MPa | EN ISO 6892-1 |
| Elongation (A80) | ≥ 28% | EN ISO 6892-1 |
| Hardness (HV) | 85-110 HV | EN ISO 6507-1 |
| r-value (Average) | ≥ 1.4 | EN ISO 10113 |
| n-value (Strain Hardening) | ≥ 0.17 | EN ISO 10275 |
| Bend Test (180°) | 0t (no cracking) | EN ISO 7438 |
| Young's Modulus | 210 GPa | Typical value |
| Poisson's Ratio | 0.30 | Typical value |
🔬 Physical Properties
| Property | Value | Temperature/Conditions |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1510°C | Solidus temperature |
| Thermal Conductivity | 54 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12×10-6/K | 20-100°C |
| Specific Heat Capacity | 500 J/kg·K | 20°C |
| Electrical Resistivity | 0.16 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | Room temperature |
| Curie Temperature | 770°C | Magnetic transition |
| Coating Melting Point (Zn) | 419°C | Pure zinc coating |
📏 Product Specifications
| Specification | Range/Options | Standard |
|---|---|---|
| Thickness | 0.40-3.00 mm | EN 10169 |
| Width | 600-1850 mm | EN 10169 |
| Coil Weight | 3-25 tonnes | Customer specification |
| Coating Type | Z (Zinc), ZF (Zinc-Iron) | EN 10169 |
| Coating Weight | 100-350 g/m² | Both sides total |
| Surface Treatment | Normal spangle, minimized spangle | EN 10169 |
| Edge Condition | Mill edge, slit edge | Customer requirement |
| Thickness Tolerance | ±0.02-0.05 mm | EN 10169 |
| Width Tolerance | +0/-2.0 mm | EN 10169 |
| Flatness | ≤ I-unit 14 | EN 10169 |
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Our Advantages in Processing EN 10169 Grade A
Advanced Continuous Coating Technology
MetalZenith operates cutting-edge continuous hot-dip coating lines with precise temperature control and uniform zinc application systems, ensuring consistent coating thickness and superior surface quality across the entire coil width and length.
Comprehensive Quality Control Systems
Our integrated quality management includes real-time coating weight monitoring, automated surface inspection systems, and rigorous mechanical testing protocols, guaranteeing EN 10169 compliance and consistent product performance.
Flexible Customization Capabilities
MetalZenith offers extensive customization options including various coating weights, surface treatments, dimensional specifications, and packaging solutions, supported by our global logistics network for reliable worldwide delivery.
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