Super Duplex S32750

Super Duplex 2507® Stainless Steel Bar

UNS S32750

UNS S32750, commonly known as Super Duplex 2507®, is very similar to UNS S31803 Duplex. The difference between the two is the contents of chromium and nitrogen are higher in the Super Duplex Grade which in turn creates higher corrosion resistance as well as a longer lifespan. Super Duplex is composed of between 24% to 26% chromium, 6% to 8% nickel, 3% molybdenum, and 1.2% manganese, with the balance being iron. Also found in Super Duplex are trace amounts of carbon, phosphorus, sulfur, silicon, nitrogen, and copper. Benefits include: good weldability and workability, a high level of thermal conductivity and low coefficient of thermal expansion, high resistance to corrosion, fatigue, high resistance to pitting and crevice corrosion, high resistance to stress corrosion cracking (especially chloride stress corrosion cracking), high energy absorption, high strength, and erosion. Essentially, the Duplex alloys are a compromise; possessing some of the ferritic stress corrosion cracking resistance and much of the superior formability of the common austenitic stainless alloys, more cost effectively than the high nickel alloys.

Industries that use Super Duplex include:

• Chemical

• Marine

• Oil and Gas production

• Petrochemical

• Power

• Pulp and Paper

• Water desalinization

Super duplex flanges are a type of piping component that is designed to provide high levels of corrosion resistance and strength in demanding applications. These flanges are typically made from a special type of duplex stainless steel that contains higher amounts of chromium, molybdenum, and nitrogen than traditional duplex stainless steels. In this article, we will explore the properties of super duplex flanges, their applications, manufacturing methods, and their advantages over other types of flanges.

Properties of Super Duplex Flanges

Super duplex flanges are known for their high strength, corrosion resistance, and excellent resistance to stress corrosion cracking. These properties make them ideal for use in aggressive environments such as chemical processing, oil and gas production, and offshore drilling. The following are some of the key properties of super duplex flanges:

1. Corrosion Resistance: Super duplex flanges are highly resistant to corrosion in a wide range of acidic and alkaline environments, as well as in seawater and other chloride-rich environments.

2. Strength: Super duplex flanges have a higher strength than traditional duplex stainless steels, making them ideal for use in high-pressure applications.

3. Stress Corrosion Cracking Resistance: Super duplex flanges are highly resistant to stress corrosion cracking, which is a common problem in harsh environments.

4. Toughness: Super duplex flanges have a high toughness, which allows them to withstand impact and fatigue loading.

5. Weldability: Super duplex flanges have good weldability, which allows for easy fabrication and installation.

Applications of Super Duplex Flanges

Super duplex flanges are used in a variety of applications where high strength and corrosion resistance are required. Some of the most common applications include:

1. Oil and Gas Production: Super duplex flanges are commonly used in offshore oil and gas production, where they provide excellent resistance to corrosion and high pressures.

2. Chemical Processing: Super duplex flanges are used in chemical processing plants, where they are exposed to highly corrosive chemicals and high temperatures.

3. Water Treatment: Super duplex flanges are used in water treatment plants, where they provide resistance to chlorides and other corrosive substances.

4. Marine Industry: Super duplex flanges are used in marine applications, where they are exposed to seawater and other corrosive environments.

5. Pulp and Paper Industry: Super duplex flanges are used in the pulp and paper industry, where they are exposed to harsh chemicals and high temperatures.

Manufacturing Methods

Super duplex flanges are manufactured using a variety of methods, including forging, casting, and machining. The most common method used for manufacturing super duplex flanges is forging, which involves heating the steel to a high temperature and then shaping it using a hammer or press. Forging produces a high-quality, dense material that is free from defects and has excellent mechanical properties.

Machining is a third method that is used to manufacture super duplex flanges. This method involves removing material from a solid piece of steel using cutting tools such as lathes, milling machines, and drills. Machining can produce very precise shapes and dimensions, but it is not as cost-effective as forging or casting.

Advantages of Super Duplex Flanges

Super duplex flanges offer several advantages over other types of flanges, including:

1. Corrosion Resistance: Super duplex flanges are highly resistant to corrosion, making them ideal for use in harsh environments.

2. Strength: Super duplex flanges have a higher strength than traditional duplex stainless steels