Super Duplex

UNS S32750 / S32760 (F53)

Superior strength and corrosion resistance for the harshest environments.

Super Duplex UNS S32750 / S32760 is an austenitic–ferritic stainless steel developed for highly demanding environments. The alloy combines high mechanical strength with excellent resistance to corrosion, particularly in chloride-containing conditions.

Due to its high chromium, molybdenum and nitrogen content, Super Duplex UNS S32750 / S32760 outperforms standard duplex stainless steels such as UNS S32205, especially with regard to strength and resistance to localized corrosion. This makes the material particularly suitable for critical piping systems, pressure-containing equipment and structural components exposed to aggressive media.

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Key Characteristics

Super Duplex UNS S32750 / S32760 is characterized by:

High resistance to stress corrosion cracking in halide-containing environments
Excellent resistance to pitting and crevice corrosion
High yield strength and tensile strength
High resistance to general corrosion
High thermal conductivity
Low thermal expansion compared to austenitic stainless steels
High mechanical strength
Strong resistance to erosion, corrosion and corrosion fatigue

The alloy typically achieves PREN values above 40, which is characteristic for super duplex stainless steels.

Fast, Flexible, Global Delivery

Whether you need immediate delivery from stock or scheduled shipments for long-term projects, we deliver where and when you need it.

From urgent single shipments to complete packages, we tailor our delivery to your planning.

Prefer to handle logistics yourself? No problem. We offer flexible delivery terms, including Ex Works. Want us to take care of everything? We’ll arrange full-service transport, tracking, and documentation.

Get in touch to discuss the best delivery setup for your project.

Product Details

Application – by Service and Function

Super Duplex UNS S32750 / S32760 is commonly used in applications where both mechanical strength and corrosion resistance are critical:

Pressure vessels
High-pressure piping systems
Structural components
Fire-fighting systems
High-pressure reverse osmosis (RO) plants
Chemical tankers

The material offers good weldability for a super duplex stainless steel, provided that appropriate welding procedures are applied to maintain the correct austenite–ferrite balance.

Application – by Industry

Super Duplex UNS S32750 / S32760 is used across a wide range of industries, including:

Oil and gas production
Petrochemical industry
Energy industry
Chemical processing
Water desalination
Shipping and offshore
Pulp and paper production

Its combination of strength, corrosion resistance and durability makes it suitable for both upstream and downstream applications in aggressive environments.

Standards and Specifications

Product Type	Standard	Grade
Seamless pipe	ASTM A790	UNS S32750 / S32760
Welded pipe	ASTM A928	UNS S32750 / S32760
Fittings (seamless & welded)	ASTM A815	UNS S32750 / S32760
Flanges & forgings	ASTM A182	F53 (UNS S32750) / F55 (UNS S32760)

All materials are sourced from reputable mills and can be delivered with additional testing according to customer specifications, such as Shell DEP, ADNOC, and PDO requirements.

Stainalloy Capabilities

Stainalloy supplies Super Duplex UNS S32750 / S32760 as part of its comprehensive exotic steel stock and project solutions offering.

Key capabilities include:

A full stock programme of Super Duplex piping materials
Seamless and welded pipes, fittings, forgings and flanges from ½” up to and including 48″
Large pipe packs designed for oil and gas production and processing projects
Medium-sized piping packages available from stock for short lead-time requirements
Global delivery supported by in-house quality assurance and logistics

Stainalloy combines extensive stock availability with specialized project management, supporting customers throughout all phases of construction and execution.

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