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Technical Specifications
Product Overview
Metallurgical Characteristics
Super Duplex Stainless Steel features a balanced duplex microstructure consisting of approximately 50% austenite and 50% ferrite phases. This unique dual-phase structure combines the excellent corrosion resistance of austenitic grades with the high strength and stress corrosion cracking resistance of ferritic grades. The high chromium, molybdenum, and nitrogen content provides exceptional pitting and crevice corrosion resistance, with PREN values exceeding 40.
Heat Treatment Process
MetalZenith employs solution annealing at 1020-1100°C followed by rapid water quenching to achieve optimal duplex microstructure. This controlled thermal processing prevents harmful intermetallic phase formation while ensuring balanced austenite-ferrite ratio. Post-weld heat treatment at 1050°C may be applied for heavy section welded components to restore optimal corrosion resistance.
Advanced Manufacturing Process
MetalZenith utilizes vacuum induction melting followed by electroslag remelting to ensure chemical homogeneity and minimize inclusions. Our controlled rolling and forging processes maintain optimal grain structure while preventing excessive ferrite formation. Advanced quality control includes ferrite content measurement, intergranular corrosion testing, and comprehensive mechanical property verification.
Specialized Corrosion Testing
MetalZenith conducts comprehensive corrosion evaluation including Critical Pitting Temperature testing in 1M NaCl solution, Crevice Corrosion Potential measurement, Stress Corrosion Cracking threshold determination in chloride environments, and Chloride Ion Resistance testing up to 25% concentration. These specialized tests ensure superior performance in aggressive marine and chemical processing environments.
Application-Specific Engineering
For seawater desalination applications, MetalZenith optimizes material composition for maximum chloride resistance and thermal stability. In petrochemical environments, special attention is given to hydrogen sulfide resistance and high-temperature performance. Nuclear industry applications require enhanced radiation resistance and strict quality documentation. Deep-sea equipment demands superior mechanical properties at low temperatures combined with exceptional seawater corrosion resistance.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Chromium (Cr) | 24.0 - 26.0 |
| Nickel (Ni) | 6.0 - 8.0 |
| Molybdenum (Mo) | 3.0 - 4.0 |
| Tungsten (W) | 0.5 - 1.0 |
| Nitrogen (N) | 0.24 - 0.32 |
| Manganese (Mn) | ≤ 1.20 |
| Silicon (Si) | ≤ 0.80 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 550 |
| Tensile Strength (MPa) | 750 - 950 |
| Elongation (%) | ≥ 25 |
| Hardness (HRC) | ≤ 32 |
| Critical Pitting Temperature (°C) | ≥ 80 |
| PREN Value | ≥ 40 |
| 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 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Pipes, Tubes, Forgings, Fittings |
| Thickness Range | 0.5 - 150mm |
| Width Range | 1000 - 3000mm |
| Length Range | 2000 - 12000mm |
| Standards Compliance | ASTM A790, A928, NACE MR0175, EN 10088 |
| Heat Treatment Condition | Solution Annealed and Quenched |
| Surface Finish | 2B, BA, No.4, Pickled, Polished |
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Our Advantages in Processing Super Duplex Stainless Steel
Advanced Solution Annealing Process
MetalZenith employs precision solution annealing at 1020-1100°C with controlled cooling rates to achieve optimal duplex microstructure. Our advanced thermal processing ensures balanced austenite-ferrite phases (45-55% each), maximizing corrosion resistance and mechanical strength for extreme environment applications.
Comprehensive Corrosion Testing Protocol
MetalZenith conducts extensive specialized testing including Critical Pitting Temperature (CPT) testing up to 80°C, Crevice Corrosion Potential analysis, Stress Corrosion Cracking threshold evaluation, and Chloride Ion Resistance testing up to 25% NaCl solutions, ensuring superior performance in aggressive marine and chemical environments.
Custom Engineering Solutions
MetalZenith provides comprehensive custom fabrication services including precision machining, specialized welding with matching filler metals, and tailored heat treatment protocols. Our technical team offers application-specific material selection and processing optimization for critical corrosive environment applications.
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