Introduction
In offshore, seawater desalination, FGD and chemical piping projects with high chloride content, conventional 316L stainless steel often suffers from pitting, crevice corrosion and stress corrosion cracking. UNS S32750 (2507) super duplex steel pipe fittings deliver a balanced microstructure of roughly 50% austenite and 50% ferrite, combining high mechanical strength and superior chloride corrosion resistance for demanding piping systems.
What is UNS S32750 (2507) Super Duplex Steel
UNS S32750, also known as 2507 super duplex stainless steel, is a high-alloy grade with high chromium, molybdenum and nitrogen. Its PREN value exceeds 40. The dual-phase structure combines the high strength of ferritic steel and good toughness & weldability of austenitic stainless steel.
Key Benefits of 2507 Pipe Fittings
- High Yield Strength: Around twice the yield strength of 316L, allowing thinner wall design and reducing overall project cost.
- Excellent Chloride Corrosion Resistance: Outstanding resistance to pitting, crevice corrosion and chloride-induced stress corrosion cracking for seawater and brine service.
- Good General Corrosion & Erosion Fatigue Resistance: Suitable for acidic and sulfide-containing media.
- Good Weldability: Butt-weldable, retaining duplex structure and corrosion resistance after proper welding.
Product Range & Standards
Our UNS S32750 fittings include elbows, tees, reducers, caps and stub ends.
- Standards: ASTM A815 / ASME B16.9
- Types: seamless & butt-weld fittings
- Service: OEM & ODM custom sizes available. MTR, heat treatment report and NDT test reports can be provided for project inspection.
Main Applications
- Offshore oil & gas, subsea and marine engineering
- Seawater desalination & water treatment plants
- FGD flue gas desulfurization systems
- Chemical & petrochemical process piping
- Pulp & paper bleaching equipment
Material Selection Guide: S32750 vs 316L vs 2205
- 316L: Poor performance under high chloride conditions, prone to SCC and pitting.
- 2205 duplex: Cost-effective, but limited corrosion margin at high chloride & high temperature.
- UNS S32750 (2507): PREN＞40, higher safety margin for critical long-lifetime projects with severe chloride environments.
Our Manufacturing Capability
We are a professional manufacturer of super duplex pipe fittings. Full quality control from raw material, forging, heat treatment, machining to NDT inspection. Each product is marked with grade, heat number and specification. We supply worldwide for EPC projects.
Conclusion
For piping systems under high pressure plus heavy chloride corrosion, UNS S32750 (2507) super duplex fittings offer reliable long-term performance.
Contact us for material datasheets, samples and quotations for your project.
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