Super Duplex 2507 (UNS S32750) - ASTM A276/A479 Bar & Plate Supplier | Hangbo Alloy

Overview: Super Duplex 2507 (UNS S32750) / 1.4410

Super Duplex 2507 is a high-performance alloy designed for exceptionally demanding environments. Benchmarked against ASTM A276 and A479, it features a Pitting Resistance Equivalent Number (PREN) greater than 40, placing it in the "Super Duplex" category for extreme corrosion resistance.

Specifications & Standards by Product Form

Chemical Composition (ASTM A276 / UNS S32750)

Mechanical Properties (Typical at Room Temp)

Material Characteristics & Applications

• Extreme Corrosion Resistance: PREN > 40 ensures immunity to pitting in hot seawater and high-chloride environments.
• Ultra-High Strength: Yield strength is higher than standard duplex grades, allowing for compact component designs.
• Impact Toughness: Maintains high impact strength even at sub-zero temperatures.

Primary Applications: Seawater desalination, offshore oil & gas platforms, chemical tankers, and high-pressure subsea equipment.

Global Project Case: Seawater Desalination High-Pressure Pumps

Hangbo Alloy provided Super Duplex 2507 forgings for the main high-pressure pump casings in a Middle Eastern desalination plant. The extreme chloride levels and high temperatures made standard alloys prone to rapid pitting. Super Duplex 2507 was selected for its PREN > 40, resulting in zero corrosion-related downtime over 5 years of operation.

Pros & Cons

• Pros: Unmatched resistance to pitting/crevice corrosion, very high strength, and excellent thermal conductivity.
• Cons: Limited use temperature (under 250°C), difficult to form and machine, requires precise welding control.

Deep FAQ: The Advantage of PREN > 40

1. What does PREN > 40 actually mean for performance? It signifies that the alloy is highly resistant to localized corrosion (pitting) even in the most aggressive saline and acidic environments.
2. How does 2507 compare to Duplex 2205? 2507 has higher Cr, Mo, and N content, resulting in significantly higher strength and corrosion resistance (PREN > 40 vs 2205's PREN ~34).
3. Can 2507 be used in sour gas environments? Yes, it meets NACE MR0175/ISO 15156 standards for use in H2S-containing environments.
4. What are the challenges in welding Super Duplex 2507? It requires tight heat input control to avoid the precipitation of intermetallic phases (like sigma phase), which can degrade toughness.
5. Is Super Duplex 2507 magnetic? Yes, due to its 50% ferritic microstructure, it is strongly magnetic.

View our full Super Duplex Inventory or request a quote for High-Pressure Components.

Production Process

Our material is manufactured using VIM (Vacuum Induction Melting) + VAR (Vacuum Arc Remelting) or ESR (Electroslag Refining) processes to ensure ultra-high purity and metallurgical integrity. The material undergoes precision machining and rigorous heat treatment (Solution Annealing/Aging) to achieve the specified mechanical properties and grain size consistency.

Testing & Inspection

To guarantee zero-defect delivery, all batches undergo comprehensive testing:

• UT/PT Flaw Detection: Ultrasonic and Penetrant testing to identify surface and internal defects.
• Mechanical Testing: High and low temperature tensile testing, impact testing, and hardness verification.
• Corrosion Testing: Intergranular corrosion tests and pitting resistance verification according to ASTM standards.

Quality Control

We implement a total quality management system with full-process traceability from raw material to finished product. All products are manufactured in strict compliance with ASTM, ASME, and AMS standards, accompanied by EN 10204 3.1/3.2 certificates.

Market Pain Points & Solutions

• Delivery Consistency: We address supply chain delays by maintaining a large inventory of raw billets and semi-finished products, ensuring rapid response times.
• Extreme Environment Tolerance: Our specialized melting processes ensure that our alloys maintain structural stability in highly corrosive and high-pressure environments where standard materials fail.

Deep Application Insights

• Petrochemical: Used in flare stacks and flare tips where resistance to high temperatures and sour gas corrosion is critical.
• Nuclear Power: Applied in reactor core components and control rod mechanisms due to its excellent radiation resistance and mechanical stability.
• Aerospace: Found in engine exhaust systems and turbine shroud rings where high fatigue strength and oxidation resistance are required.

Product Forms & Standards Comparison