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Technical Specifications
Product Overview
Metallurgical Characteristics
Galvanized Steel (Coated) features an austenitic stainless steel matrix with a protective zinc-iron intermetallic coating layer. The substrate maintains a stable austenitic microstructure with excellent corrosion resistance, while the galvanized coating provides additional barrier protection and sacrificial corrosion protection. The coating consists of multiple layers including the outer zinc layer and intermediate zinc-iron alloy phases.
Heat Treatment Process
MetalZenith employs solution annealing at 1050-1100°C followed by rapid cooling to maintain austenitic structure and prevent carbide precipitation. The galvanizing process is conducted at 450-460°C with controlled immersion time and withdrawal speed to achieve optimal coating thickness and uniformity while preserving the stainless steel properties.
Advanced Manufacturing Process
Our manufacturing process includes surface preparation with pickling and activation, followed by flux treatment and hot-dip galvanizing in molten zinc bath. Post-coating treatments include air knife control for thickness uniformity and optional chromate passivation for enhanced corrosion protection. Quality control includes real-time coating thickness monitoring and surface quality inspection.
Specialized Quality Testing
MetalZenith conducts comprehensive testing including pitting potential measurement (≥ 200mV vs SCE), intergranular corrosion testing per ASTM A262 Method A, stress corrosion cracking evaluation in chloride environments, and passivation film thickness analysis using XPS. Additional tests include coating adhesion, bend testing, and salt spray corrosion resistance up to 1000 hours.
Application-Specific Considerations
For chemical equipment applications, the material offers excellent resistance to organic acids and moderate alkaline solutions. In food industry applications, the FDA-compliant coating ensures safe food contact with easy cleaning properties. Medical device applications benefit from biocompatibility and sterilization resistance. Marine engineering applications utilize the dual corrosion protection in saltwater environments, while architectural applications leverage the aesthetic appeal and long-term durability of the coating system.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 17.0 - 20.0 |
| Nickel (Ni) | 8.0 - 12.0 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Zinc Coating (Zn) | 85 - 275 g/m2 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 205 |
| Tensile Strength (MPa) | 515 - 720 |
| Elongation (%) | ≥ 40 |
| Hardness (HRB) | ≤ 90 |
| Corrosion Resistance | Excellent (PREN ≥ 18) |
| Coating Adhesion | ≥ 15 MPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.93 |
| Melting Point (°C) | 1400 - 1450 |
| Thermal Conductivity (W/m·K) | 16.2 |
| Thermal Expansion (×10??/K) | 17.3 |
| Electrical Resistivity (μΩ·cm) | 72 |
| Elastic Modulus (GPa) | 200 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Sheets, Coils, Plates, Tubes, Profiles |
| Thickness Range | 0.5 - 25mm |
| Width Range | 600 - 2000mm |
| Coating Thickness | Z85 - Z275 (85-275 g/m2) |
| Standards Compliance | ASTM A653, EN 10346, JIS G3302 |
| Surface Finish | Regular Spangle, Minimized Spangle, Zero Spangle |
| Heat Treatment Condition | Solution Annealed + Galvanized |
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Our Advantages in Processing Galvanized Steel (Coated)
Advanced Hot-Dip Galvanizing Technology
MetalZenith employs precision-controlled hot-dip galvanizing with real-time temperature monitoring and atmosphere control to achieve optimal zinc coating uniformity. Our advanced process ensures superior coating adhesion and corrosion protection while maintaining the stainless steel's inherent properties.
Comprehensive Corrosion Testing Protocol
Our rigorous quality testing includes pitting potential measurement, intergranular corrosion testing per ASTM A262, stress corrosion cracking evaluation, and passivation film thickness analysis. These specialized tests ensure optimal corrosion resistance for demanding chemical and marine environments.
Custom Coating Solutions & Technical Support
MetalZenith provides tailored coating thickness specifications, specialized surface treatments, and comprehensive technical support. Our engineering team offers application-specific recommendations for chemical processing, food industry, and medical device requirements with full traceability documentation.
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