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Technical Specifications
Product Overview
Metallurgical Characteristics
Duplex stainless steel features a balanced microstructure consisting of approximately 50% austenite and 50% ferrite phases. This unique dual-phase structure provides superior strength compared to austenitic grades while maintaining excellent corrosion resistance. The controlled nitrogen content enhances pitting resistance and mechanical properties, while molybdenum additions significantly improve crevice corrosion resistance in chloride environments.
Heat Treatment Process
MetalZenith employs solution annealing at 1020-1100°C followed by rapid water quenching to achieve optimal phase balance and prevent harmful intermetallic precipitation. Our controlled cooling process ensures maximum corrosion resistance while maintaining the desired mechanical properties. Post-weld heat treatment at 1050°C may be applied for heavy section welded components.
Advanced Manufacturing Process
MetalZenith utilizes electric arc furnace melting with argon-oxygen decarburization (AOD) refining to achieve precise chemical composition control. Our vacuum degassing process ensures low hydrogen content and optimal cleanliness. Hot rolling is performed with careful temperature control to maintain proper phase balance, followed by solution annealing and descaling operations.
Specialized Quality Testing
MetalZenith conducts comprehensive corrosion testing including critical pitting temperature (CPT) measurement in 6% FeCl? solution, crevice corrosion potential evaluation, stress corrosion cracking threshold testing in boiling MgCl?, and chloride ion tolerance assessment. Ferrite content verification using magnetic measurement ensures optimal phase balance for maximum performance.
Application Engineering Considerations
For seawater desalination applications, duplex stainless steel provides superior resistance to chloride-induced pitting and crevice corrosion. In petrochemical environments, the alloy's high strength allows for thinner wall sections while maintaining pressure vessel integrity. Nuclear applications benefit from the material's low neutron absorption and excellent radiation resistance. Deep-sea equipment applications leverage the superior strength-to-weight ratio and immunity to hydrogen embrittlement under cathodic protection conditions.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Chromium (Cr) | 21.0 - 23.0 |
| Nickel (Ni) | 4.5 - 6.5 |
| Molybdenum (Mo) | 2.5 - 3.5 |
| Nitrogen (N) | 0.08 - 0.20 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.020 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 450 |
| Tensile Strength (MPa) | 620 - 880 |
| Elongation (%) | ≥ 25 |
| Hardness (HRC) | 22 - 28 |
| Critical Pitting Temperature (°C) | ≥ 35 |
| PREN Value | ≥ 35 |
| Impact Energy at -40°C (J) | ≥ 60 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.8 |
| Melting Point (°C) | 1350 - 1400 |
| Thermal Conductivity (W/m·K) | 17 |
| Thermal Expansion (×10??/K) | 13.0 |
| Elastic Modulus (GPa) | 200 |
| Magnetic Permeability | Ferromagnetic |
| Electrical Resistivity (μΩ·cm) | 85 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Pipes, Tubes, Forgings |
| Thickness Range | 3 - 150mm |
| Width Range | 1000 - 3000mm |
| Length Range | 2000 - 12000mm |
| Standards Compliance | ASTM A790, A928, NACE MR0175, EN 1.4462 |
| Heat Treatment Condition | Solution Annealed and Quenched |
| Surface Finish | 2B, BA, No.4, Pickled |
| Testing Certifications | Mill Test Certificate, CPT Testing, NACE Compliance |
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Our Advantages in Processing Duplex Stainless Steel
Advanced Solution Annealing Process
MetalZenith employs precision solution annealing at 1020-1100°C with controlled cooling rates to achieve optimal 50:50 austenite-ferrite phase balance. Our advanced thermal processing ensures maximum corrosion resistance and mechanical properties while preventing harmful intermetallic phase formation.
Comprehensive Corrosion Testing
MetalZenith conducts extensive corrosion testing including critical pitting temperature (CPT) measurement, crevice corrosion potential evaluation, stress corrosion cracking threshold testing, and chloride ion tolerance assessment. Our rigorous testing protocols ensure superior performance in aggressive marine and chemical environments.
Custom Engineering Solutions
MetalZenith provides comprehensive technical support and custom processing solutions for duplex stainless steel applications. Our metallurgical experts offer specialized heat treatment, welding consultation, and application-specific alloy modifications to meet unique project requirements in extreme environments.
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