What is the difference between UNS S32750 and UNS S32760?

What is Super Duplex Steel S32750?

Super Duplex Steel S32750, also known as UNS S32750 or 2507, is a high-performance super duplex stainless steel alloy with a balanced austenite-ferrite microstructure. It offers exceptional strength and superior resistance to chloride-induced corrosion, including pitting and stress corrosion cracking. Its chemical composition, featuring ~25% chromium, ~7% nickel, and ~4% molybdenum, gives it a high Pitting Resistance Equivalent (PREN). S32750 is used in demanding applications within the oil and gas, chemical processing, and desalination industries where standard duplex steels or austenitic stainless steels are insufficient.

What is UNS S32760 stainless steel?

UNS S32760 is a super duplex stainless steel known for its high mechanical strength, excellent ductility, and outstanding resistance to various forms of corrosion, particularly in aggressive chloride-containing environments. It has a balanced austenite-ferrite microstructure and a Pitting Resistance Equivalent (PREN) greater than 40, making it a cost-effective alternative to some titanium and nickel-based alloys in applications like the oil and gas, petrochemical, and marine industries.

In marine applications, UNS S32760 super duplex stainless steel tees are used in offshore platforms and shipbuilding due to their high strength and resistance to seawater corrosion. They can be used in structural support members such as beams and columns. In the aerospace sector, they are used in fuel lines or hydraulic systems.

 

UNS S32750/S32760 Super Duplex Stainless Steel Pipe Fittings Indian Standard Equivalent

STANDARD	Union	Werkstoff Nr.
Super Duplex 2507	S32750 / S32760	1.4410

 

ASTM A815/A815M Super Duplex UNS S32750/S32760 Pipe Fittings Chemical Composition

Qualification	C	Minnesota	Yeah	P	S	CR	Month	NEITHER	N	Frowning
S32750	0.030 Max	1.20 Max	0. 80 Max	0.035 Max	0. 020 Max	24.00 – 26.00	3.00 – 5.00	6.00 – 8.00	0.24 – 0.32	58,095 min
S32760	0.05 Max	1.00 max	1.00 max	0.030 Max	0.010 Max	24.00 – 26.00	3.00 – 4.00	6.00 – 8.00	0.20 – 0.30	57.61 min

 

Mechanical Properties

Both UNS S32750 and UNS S32760 offer high mechanical strength, nearly double that of conventional stainless steels.

Property	UNS S32750 Pipes	UNS S32760 Pipes	Zeron 100 Pipes
Tensile Strength	≥ 800 MPa	≥ 800 MPa	≥ 800 MPa
Yield Strength	≥ 550 MPa	≥ 550 MPa	≥ 550 MPa
Elongation	≥ 15%	≥ 15%	≥ 15%
Hardness (HB)	≤ 310	≤ 310	≤ 310

 
Super Duplex Steel UNS S32750 / S32760 Butt Weld Fittings Specifications
ASTM A815 / ASME SA815 Specifications

ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 sizes

Sizes from 1/2″ NB to 24″ NB in

Seamless/Welded/Fabric types

Bending radius r = 1d, 2d, 3d, 5d, 6d, 8d, 10d or customized

Grosness Sch 5s, Sch 10s, Sch 40S, Sch 80s, Sch 160s, Sch xxs

 

​​Corrosion Resistance​​

UNS S32750 pipes exhibit excellent resistance to stress corrosion cracking and localized corrosion, making them suitable for moderately corrosive environments such as desalination plants and seawater cooling systems. UNS S32760 pipes deliver superior performance to S32750 due to their tungsten and copper content, providing enhanced resistance to pitting and crevice corrosion in high-salinity and highly acidic environments.

 

UNS S32750 vs. UNS S32760 :Compatibility
UNS S32750 (often known as SAF2507) and UNS S32760 (Zeron 100) are both high-performance super duplex stainless steels with similar properties, making them often compatible and interchangeable, though UNS S32760 contains higher levels of tungsten and copper, offering enhanced corrosion resistance in specific environments like those with high concentrations of sulfuric and hydrochloric acid.

 

Will UNS S32750 and UNS S32760 create a galvanic couple?

No. UNS S32750 and UNS S32760 are both super-duplex stainless steels. While their chemical compositions differ, their electrochemical potentials are so similar that they don't form a strong galvanic couple in most corrosive environments. A galvanic potential occurs when two dissimilar metals are electrically connected in an electrolyte, with the less noble metal acting as the anode and corroding. UNS S32750 and UNS S32760 are both high-performance, corrosion-resistant alloys, but their compositions differ slightly-for example, UNS S32760 has higher tungsten and copper contents-so they don't generate enough of a potential difference when in contact to cause severe galvanic corrosion.

If you have any questions about the comparison between UNS S32750 and UNS S32760, please contact us!Email: info@gneestainless.com

 

If you have a project need for UNS S32750 and UNS S32760, we welcome your order. GNEE has a large inventory of popular products for you to choose from. They can be processed into a variety of practical product forms, including sheets, coils, tubes, bars, and wires. For detailed chemical composition and free samples, please contact our factory today. We offer competitive pricing and excellent service.