Duplex and Super Duplex Pipes Fittings

What is Duplex and Super Duplex Pipes Fittings?

Duplex and super duplex pipes and fittings are types of piping materials that are designed to offer higher resistance to corrosion and erosion, better mechanical strength, and improved durability compared to standard austenitic stainless steel piping materials.

Duplex pipes and fittings are made from a duplex stainless steel material that has a microstructure consisting of roughly equal proportions of austenite and ferrite. This dual-phase structure provides the material with a unique combination of corrosion resistance, strength, and toughness, making it suitable for use in harsh and corrosive environments.

Super duplex pipes and fittings, on the other hand, are made from a super duplex stainless steel material that has an even higher content of chromium, molybdenum, and nitrogen, resulting in enhanced corrosion resistance and improved mechanical strength. These materials are ideal for use in aggressive chemical and petrochemical environments, offshore oil and gas applications, and other demanding industrial applications.

Both duplex and super duplex pipes and fittings are widely used in industries such as oil and gas, chemical processing, pulp and paper, and marine engineering, among others, where their superior performance and durability are essential.

Duplex and Super Duplex Pipes Fittings Available Types & Shapes

Duplex and Super Duplex pipes are high-strength, corrosion-resistant alloys that are commonly used in a variety of industries, including oil and gas, chemical, and marine engineering. These alloys are composed of a combination of austenitic and ferritic stainless steels, which gives them excellent mechanical properties and resistance to corrosion.

There are a variety of fittings available for Duplex and Super Duplex pipes, including:

1. Elbows: These are used to change the direction of the flow of the fluid in the pipe. Elbows are available in different angles such as 45 degrees, 90 degrees, and 180 degrees.

2. Tees: These are used to create a branch in the pipe, and they come in equal and unequal sizes.

3. Reducers: These are used to connect pipes of different diameters.

4. Caps: These are used to close the end of a pipe.

5. Flanges: These are used to connect pipes and valves, and they come in a variety of sizes and types, such as weld neck, slip-on, and socket weld.

6. Couplings: These are used to join two pipes together, and they come in different types, such as full coupling, half coupling, and reducing coupling.

The shapes of these fittings can vary depending on their purpose and the specific requirements of the application. For example, some fittings may be designed with a threaded or welded connection, while others may have a flanged connection. Some fittings may also be designed with a specific shape, such as a swage nipple, which is used to connect two pipes of different sizes. Overall, there are a variety of Duplex and Super Duplex pipe fittings available to meet the needs of different industries and applications.

Duplex and Super Duplex Pipes Fittings Chemical Composition

Duplex and Super Duplex pipes fittings are made of materials that offer high resistance to corrosion and high mechanical strength. The chemical composition of these materials can vary slightly depending on the specific grade and manufacturer, but generally, they consist of the following:

Duplex Stainless Steel:

• Iron (Fe): Balance

• Chromium (Cr): 21.0-23.0%

• Nickel (Ni): 4.5-6.5%

• Molybdenum (Mo): 2.5-3.5%

• Manganese (Mn): 2.0% max

• Silicon (Si): 1.0% max

• Nitrogen (N): 0.08-0.20%

• Carbon (C): 0.030% max

• Phosphorus (P): 0.030% max

• Sulfur (S): 0.020% max

Super Duplex Stainless Steel:

• Iron (Fe): Balance

• Chromium (Cr): 24.0-26.0%

• Nickel (Ni): 6.0-8.0%

• Molybdenum (Mo): 3.0-5.0%

• Manganese (Mn): 2.0% max

• Silicon (Si): 1.0% max

• Nitrogen (N): 0.20-0.30%

• Carbon (C): 0.030% max

• Phosphorus (P): 0.030% max

• Sulfur (S): 0.020% max

Mechanical properties Equivalent Grades of Duplex and Super Duplex Pipes Fittings

Here are some common grades of Duplex and Super Duplex stainless steels and their equivalent grades:

1. Duplex Stainless Steel Grades:

• ASTM A790 UNS S31803/S32205: Equivalent to 1.4462, X2CrNiMoN22-5-3, and UNS31803/1.4462/F51.

• ASTM A815 UNS S32750/S32760: Equivalent to 1.4410, X2CrNiMoN25-7-4, and UNS32750/1.4410/F53.

• ASTM A182 F51: Equivalent to 1.4462, X2CrNiMoN22-5-3, and UNS31803/1.4462/F51.

• ASTM A182 F60: Equivalent to 1.4462, X2CrNiMoN22-5-3, and UNS31803/1.4462/F51.

1. Super Duplex Stainless Steel Grades:

• ASTM A790 UNS S32750/S32760: Equivalent to 1.4410, X2CrNiMoN25-7-4, and UNS32750/1.4410/F53.

• ASTM A182 F53: Equivalent to 1.4410, X2CrNiMoN25-7-4, and UNS32750/1.4410/F53.

• ASTM A182 F55: Equivalent to 1.4501, X2CrNiMoCuWN25-7-4, and UNS32760/1.4501/F55.

• ASTM A182 F61: Equivalent to 1.4507, X2CrNiMoCuN25-6-3, and UNS32550/1.4507/F61.

Note that these equivalent grades may vary depending on the standard used. It's essential to consult the specific standards and specifications for accurate information.

Duplex and Super Duplex Pipes Fittings Specification

Here are some common specifications for Duplex and Super Duplex pipes and fittings:

1. Duplex Pipes and Fittings Specification:

• Material Grade: ASTM A790 UNS S31803/S32205, ASTM A815 UNS S31803/S32205

• Size Range: Pipes - 1/2" NB to 36" NB, Fittings - 1/2" NB to 24" NB

• Wall Thickness: SCH 5S, 10S, 20S, 40S, STD, 80S, XS, 160S

• Types of Pipes: Seamless, Welded

• Types of Fittings: Butt Weld, Socket Weld, Threaded

• Standards: ASTM, ASME, ANSI, EN, DIN, JIS

1. Super Duplex Pipes and Fittings Specification:

• Material Grade: ASTM A790 UNS S32750/S32760, ASTM A815 UNS S32750/S32760

• Size Range: Pipes - 1/2" NB to 36" NB, Fittings - 1/2" NB to 24" NB

• Wall Thickness: SCH 5S, 10S, 20S, 40S, STD, 80S, XS, 160S

• Types of Pipes: Seamless, Welded

• Types of Fittings: Butt Weld, Socket Weld, Threaded

• Standards: ASTM, ASME, ANSI, EN, DIN, JIS

Some of the common types of Duplex and Super Duplex fittings are elbows, tees, reducers, flanges, and stub ends. These fittings are available in various sizes, grades, and specifications, depending on the application requirements. It's essential to consult the specific standards and specifications for accurate information before selecting and installing Duplex and Super Duplex pipes and fittings systems.

Duplex and Super Duplex Pipes Fittings Application

Duplex and Super Duplex stainless steels are versatile materials that are suitable for various applications in industries such as oil and gas, chemical processing, and marine engineering. Here are some common applications of Duplex and Super Duplex pipes and fittings:

1. Oil and Gas Industry: Duplex and Super Duplex pipes and fittings are used extensively in the oil and gas industry for applications such as pipelines, offshore platforms, and subsea equipment. Their excellent corrosion resistance and high strength make them ideal for harsh environments.

2. Chemical Processing Industry: Duplex and Super Duplex pipes and fittings are used in chemical processing plants for applications such as reactors, heat exchangers, and storage tanks. Their resistance to corrosion and chemical attack makes them ideal for handling corrosive fluids.

3. Marine Engineering: Duplex and Super Duplex pipes and fittings are used in marine engineering for applications such as shipbuilding, offshore drilling, and seawater desalination plants. Their high strength and corrosion resistance make them ideal for withstanding the harsh marine environment.

4. Power Generation: Duplex and Super Duplex pipes and fittings are used in power generation plants for applications such as heat exchangers, condensers, and steam generators. Their high strength and resistance to corrosion and erosion make them ideal for high-temperature and high-pressure applications.

5. Food and Beverage Industry: Duplex and Super Duplex pipes and fittings are used in the food and beverage industry for applications such as processing equipment and storage tanks. Their resistance to corrosion and easy cleaning properties make them ideal for handling food and beverage products.

For more information about Duplex and Super Duplex stainless steels pipe fittings, please contact us.