Product Overview
BENKOO METAL specializes in the engineering and supply of high-performance Duplex and Super Duplex Stainless Steel pipes, designed for the most demanding industrial environments. By combining a mixed microstructure of approximately 50% austenite and 50% ferrite, these steels integrate the superior toughness and corrosion resistance of austenitic steel with the exceptional strength and stress corrosion cracking resistance of ferritic steel.
Our Super Duplex range is further enhanced with increased levels of Chromium, Molybdenum, and Nitrogen, achieving a Pitting Resistance Equivalent Number (PREN) typically exceeding 40. This makes them the ideal choice for critical infrastructure in offshore oil and gas, desalination plants, and aggressive chemical processing where operational integrity is 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.
Enhanced Durability
Yield strength is approximately double that of standard austenitic grades like 304 and 316.
Weight Optimization
High strength-to-weight ratio allows for reduced wall thickness and significant overall weight savings.
Cost Efficiency
Provides a more economical long-term solution than highly alloyed austenitics due to lower material volume.
Excellent Weldability
Compatible with common welding techniques when proper procedures and filler metals are utilized.
Global Compliance
Fully certified to ASTM, ASME, EN, NORSOK, and JIS equivalents for international project requirements.
Product Gallery
Management Platforms
Metallurgical Precision
Strict control over heat treatment and phase balance to ensure 40-60% ferrite ratio.
Traceability Systems
Comprehensive EN 10204 3.2 certification and full mill test reports for every batch.
Engineering Support
Expert guidance on material selection and weld procedure qualification (WPQ).
Quality Assurance
Rigorous CPT testing per ASTM G48 to guarantee pitting resistance in harsh media.
Standard Mastery
Full alignment with NORSOK M-630 and other critical North Sea offshore standards.
Supply Chain Stability
Reliable manufacturing processes ensuring consistent quality and on-time global delivery.
Investment Return 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 have higher alloying elements (Chromium, Molybdenum, Nitrogen), resulting in a PREN value typically over 40, offering significantly higher corrosion resistance compared to standard Duplex.
Industries dealing with high-chloride environments, such as offshore oil and gas, seawater desalination, chemical processing, and pulp and paper plants.
Due to its higher yield strength, you can use pipes with thinner walls to achieve the same pressure rating, reducing the total weight of the material and lowering shipping and installation costs.
Yes, we provide full certification and traceability in accordance with NORSOK MDS D63 / M-630, essential for North Sea offshore projects.
PREN (Pitting Resistance Equivalent Number) is calculated as %Cr + 3.3x%Mo + 16x%N. It indicates the material’s ability to resist pitting corrosion; a higher value means better resistance.
Yes, they are weldable using common techniques, but require specific procedures and filler materials to maintain the critical 50/50 austenite-ferrite phase balance.
Ready to Optimize Your Infrastructure with High-Performance Duplex Steel?
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