ASTM A815 UNS S32750 Super Duplex Steel Pipe Fitting Concentric Reducer

ASME / ANSI B16.9 ASTM A815 UNS S32750 SUPER DUPLEX STEEL SMLS CONCENTRIC REDUCER

A815 is the ASTM designation for a standard specification for wrought, austenitic, and ferritic-ferritic duplex stainless steel piping fittings. UNS S32750 refers to a specific grade of duplex stainless steel, also known as 2507, which is characterized by its high strength and excellent corrosion resistance. A reducer, in the context of piping fittings, is a component used to connect two pipes of different sizes. It is designed to reduce the pipe size from a larger diameter to a smaller diameter or vice versa.

Chemical Composition

Advantages

1. Corrosion Resistance: S32750 has excellent resistance to corrosion, especially in environments that contain chlorides, making it suitable for use in marine and industrial settings.

2. High Strength: This material offers high tensile and yield strength, allowing for the use of lighter-weight piping systems without compromising on structural integrity.

3. Good Toughness and Ductility: S32750 exhibits good toughness and ductility, which are important properties for withstanding impact and maintaining the integrity of the piping system under various operating conditions.

4. Stress Corrosion Cracking Resistance: Duplex stainless steels like S32750 are known for their resistance to stress corrosion cracking, which is particularly advantageous in harsh environments.

5. Good Weldability: S32750 can be easily welded using common welding techniques, allowing for ease of installation and maintenance.

6. Cost-Effectiveness: While duplex stainless steel may have a higher initial cost compared to standard austenitic stainless steels, its longer service life and reduced maintenance needs can make it a cost-effective choice over the long term.

7. Wide Range of Applications: Due to its favorable combination of properties, S32750 pipe fittings are used in various industries, including oil and gas, chemical processing, desalination, and marine applications.

The steel combines high mechanical strength (typically up to 570 MPa yield strength) and good ductility with outstanding corrosion resistance in marine environments. The alloy is supplied with a PREN (Pitting Resistance Equivalent) at >= 40.0 which guarantees high resistance to pitting corrosion. In addition, the steel offers high resistance to crevice corrosion and stress corrosion cracking. Ambient and sub-zero (down to minus 50°C) notch ductility is good.
These attributes mean that this super duplex steel can be used successfully as an alternative to 300 series stainless steel (such as type 316), standard 22% Cr duplex steel (such as UNS S31803 / 1.4462 with PREN 33-34) and precipitation hardening stainless steels (typically 17/4PH).

Applications

• 1. Chemical processing, transport and storage
• 2. Oil and gas exploration and offshore rigs
• 3. Oil and gas refining
• 4. Marine environments
• 5. Pollution control equipment
• 6. Pulp & paper manufacturing
• 7. Chemical process plant