BENKOO METAL is a premier specialist in the engineering and supply of high-performance Duplex and Super Duplex Stainless Steel pipes, engineered specifically for the most aggressive industrial environments. By utilizing a precise mixed microstructure of approximately 50% austenite and 50% ferrite, our products seamlessly integrate the superior toughness and corrosion resistance of austenitic steels with the exceptional strength and stress corrosion cracking resistance of ferritic steels.
Our advanced Super Duplex range is further enhanced with optimized levels of Chromium, Molybdenum, and Nitrogen, achieving a Pitting Resistance Equivalent Number (PREN) typically exceeding 40. This makes our piping solutions the ideal choice for critical infrastructure in offshore oil and gas, seawater desalination plants, and high-intensity chemical processing where operational integrity and long-term reliability are non-negotiable.
Detailed Parameters
| Standard Duplex Grade | S31803 / S32205 (1.4462) | Super Duplex Grade | S32750 / S32760 (1.4410/1.4501) |
|---|---|---|---|
| Typical PREN Value | 34 - 38 | Super Duplex PREN | 40 - 45+ |
| Primary Standards | ASTM A790, ASME SA790 | European Norms | EN 10216-5, EN 10088-3 |
| Phase Balance | 40% - 60% Ferrite | NDT Methods | Ultrasonic (ASTM E213), Magnetic Particle |
| Testing Protocols | ASTM G48 (Pitting), ASTM A262 | Certification | EN 10204 3.1 / 3.2 Traceability |
Key Advantages
Extreme Corrosion Resistance
Superior resistance to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion in saltwater environments.
Enhanced Durability
Yield strength is approximately double that of standard austenitic grades like 304 and 316, ensuring longer service life.
Weight Optimization
High strength-to-weight ratio allows for reduced wall thickness and significant overall weight savings in project design.
Cost Efficiency
Provides a more economical long-term solution than highly alloyed austenitics due to lower required material volume.
Excellent Weldability
Fully compatible with common welding techniques when utilizing proper procedures and specialized filler metals.
Global Compliance
Fully certified to ASTM, ASME, EN, NORSOK, and JIS equivalents for rigorous international project requirements.
Product Gallery
Management Platforms
Metallurgical Precision
Strict control over heat treatment and phase balance to ensure a consistent 40-60% ferrite ratio.
Traceability Systems
Comprehensive EN 10204 3.2 certification and full mill test reports provided for every production batch.
Engineering Support
Expert guidance on material selection and weld procedure qualification (WPQ) for complex installations.
Quality Assurance
Rigorous CPT testing per ASTM G48 to guarantee absolute pitting resistance in harsh media.
Standard Mastery
Full alignment with NORSOK M-630 and other critical North Sea offshore industry standards.
Supply Chain Stability
Reliable manufacturing processes ensuring consistent quality and on-time global delivery schedules.
Investment Return Comparison
| Comparison Feature | Standard Austenitic (316L) | Duplex/Super Duplex |
|---|---|---|
| Yield Strength | Standard | High (Approx. 2x Higher) |
| Wall Thickness | Thicker Required | Optimized (Thinner) |
| Corrosion Life | Moderate in Chlorides | Exceptional (Extended) |
| Material Weight | Heavier | Significant Reduction |
| Lifecycle Cost | Higher Maintenance | Lower Total Cost of Ownership |
Frequently Asked Questions
Super Duplex grades contain higher levels of Chromium, Molybdenum, and Nitrogen, resulting in a PREN value typically over 40, which offers significantly higher corrosion resistance compared to standard Duplex.
Industries dealing with high-chloride environments benefit most, specifically offshore oil and gas, seawater desalination, chemical processing, and pulp and paper plants.
Due to its higher yield strength, thinner walls can be used to achieve the same pressure rating, reducing total material weight, shipping costs, and installation labor.
Yes, we provide full certification and traceability in accordance with NORSOK MDS D63 / M-630, which is essential for North Sea offshore projects.
PREN (Pitting Resistance Equivalent Number) is calculated as %Cr + 3.3x%Mo + 16x%N. It indicates a material's ability to resist pitting corrosion; the higher the value, the better the resistance.
Yes, they are weldable using common techniques, but they require specific procedures and filler materials to maintain the critical 50/50 austenite-ferrite phase balance.
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