Duplex Steel Buttweld Fittings

Duplex Steel Buttweld Fittings

Duplex Steel Buttweld Fittings Supplier

Duplex steel buttweld fittings play a crucial role in various industries where corrosion resistance, strength, and durability are paramount. These fittings are a type of fittings that are used to connect and join pipes of different sizes or to change the direction of the pipe flow. Duplex steel, a type of stainless steel with a dual-phase microstructure, offers a combination of excellent corrosion resistance and high mechanical strength, making it an ideal choice for demanding applications.

One of the key advantages of duplex steel buttweld pipe fittings is their corrosion resistance, especially in aggressive environments such as those containing chlorides, acids, and other corrosive substances. This corrosion resistance is attributed to the duplex structure, which consists of both austenitic (chromium-nickel) and ferritic (chromium-molybdenum) phases. This dual-phase microstructure provides a unique set of properties that make duplex steel highly resistant to pitting, crevice corrosion, and stress corrosion cracking.

The buttweld design of these fittings ensures a strong and leak-free connection between pipes. The welding process involves heating the ends of the 

s and the fitting, allowing them to fuse. This results in a seamless connection that enhances the structural integrity of the overall piping system. Duplex steel buttweld fittings are available in various shapes and sizes, including elbows, tees, reducers, and caps, providing flexibility in designing and constructing complex piping systems.

In addition to their corrosion resistance and strength, duplex steel buttweld pipe fittings offer excellent weldability, facilitating easy installation and maintenance. The weldability of duplex steel is influenced by its composition and proper welding procedures, ensuring that the fittings maintain their mechanical properties after welding.

Specifications of Duplex Steel Buttweld Fittings

Duplex steel buttweld fittings come with specific specifications that are crucial for ensuring their optimal performance in various industrial applications. These specifications cover aspects such as material composition, dimensions, manufacturing standards, and testing requirements. Below are key specifications typically associated with duplex steel buttweld fittings:

1. Material Composition:

Duplex steel is a family of stainless steels that contain a dual-phase microstructure consisting of both austenitic and ferritic phases. The most common duplex steel grades used for buttweld fittings include UNS S31803 (2205) and UNS S32750 (2507). These grades typically feature a high chromium and molybdenum content, providing excellent corrosion resistance and mechanical strength.

2. Dimensions:

Duplex steel buttweld pipe fittings are available in various dimensions, including sizes ranging from 1/2" to 48" (DN15 to DN1200) and thicknesses by industry standards. Common dimensions include wall thicknesses specified as Schedule 10, Schedule 40, and Schedule 80, among others.

3. Manufacturing Standards:

These fittings are manufactured in compliance with industry standards to ensure quality and interchangeability. Common standards for duplex steel buttweld fittings include ASTM A815, ASME B16.9, ASME B16.11, MSS-SP-43, and MSS-SP-75. These standards specify the dimensions, tolerances, materials, and testing requirements for the fittings.

4. Types of Fittings:

Duplex steel buttweld fittings are available in various types, each serving specific purposes in piping systems. Common types include duplex steel elbows, tees, reducers, caps, and stub ends. Elbows facilitate changes in direction, tees allow for branching, reducers adjust pipe size, caps close the end of a pipe, and stub ends are used for connecting pipes to flanges.

5. Pressure and Temperature Ratings:

The pressure and temperature ratings of duplex steel buttweld pipe fittings are crucial for determining their suitability in specific operating conditions. These ratings are often provided following ASME B16.9 and help ensure that the fittings can withstand the intended pressure and temperature requirements.

6. Testing and Inspection:

Duplex steel buttweld fittings undergo various tests to ensure their quality and integrity. Common tests include visual inspection, dimensional checks, dye penetrant testing, ultrasonic testing, and hydrostatic testing. These tests are conducted in accordance with industry standards and specifications to guarantee the reliability of the fittings.

Available Grades of Duplex Steel Buttweld Fittings

Duplex steel buttweld pipe fittings are available in various grades, each designed to meet specific performance requirements in different industrial applications. The most commonly used duplex steel grades for buttweld fittings include:

1. UNS S31803 (2205): This grade is one of the most widely used duplex stainless steel. It consists of approximately 22% chromium, 5% nickel, 3% molybdenum, and a balanced amount of iron. Known for its excellent corrosion resistance, high strength, and good weldability. UNS S31803 is often used in chemical processing, oil and gas, and marine engineering applications.

2. UNS S32205: Similar to UNS S31803, UNS S32205 is a duplex stainless steel with a dual-phase microstructure. It offers improved corrosion resistance and higher strength compared to austenitic stainless steel. UNS S32205 is commonly used in applications requiring resistance to chloride stress corrosion cracking.

3. UNS S32550: This duplex steel grade contains a higher percentage of nitrogen, which contributes to its high strength and corrosion resistance. UNS S32550 is often used in applications involving sour gas, high-pressure environments, and aggressive chemical processing.

Duplex Steel Buttweld Fittings

Types of Duplex Steel Buttweld Fittings

Duplex steel buttweld fittings come in a variety of types, each serving a specific purpose in the design and construction of piping systems. These fittings are crucial for creating strong, leak-free connections between pipes while offering the corrosion resistance and mechanical strength inherent to duplex stainless steel. Here are some common types of duplex steel buttweld fittings:

1. Duplex Steel Elbows: Elbows are fittings that enable changes in the direction of the pipe. Duplex steel elbows are available in different angles (90 degrees, 45 degrees, and 180 degrees) to facilitate the routing of pipes in various configurations.

2. Duplex Steel Tees: Tees allow for the branching of pipelines, providing a connection point for three pipes at a 90-degree angle. Duplex steel tees play a crucial role in distributing fluid flow within a piping system.

3. Duplex Steel Reducers: Reducers are used to connect pipes of different diameters. Duplex steel reducers help maintain proper fluid flow and pressure by transitioning between larger and smaller pipe sizes.

4. Duplex Steel Caps: Caps are used to close the end of a pipe, providing protection and preventing the escape of fluids. Duplex steel caps are essential for sealing the termination points of pipelines.

5. Duplex Steel Stub Ends: Stub ends are used in conjunction with lap joint flanges to create a detachable connection. Duplex steel stub ends are particularly useful in applications where frequent disassembly is required.

6. Duplex Steel Crosses: Cross fittings enable the intersection of four pipes at a central point. Duplex steel crosses are employed in complex piping configurations where multiple branches converge.

7. Duplex Steel Lateral Tees: Lateral tees are similar to standard tees but have a 45-degree outlet for fluid distribution. Duplex steel lateral tees are used when a more gradual change in direction is needed.

8. Duplex Steel Unions: Unions are fittings that allow for the easy and quick disconnection of pipes. Duplex steel unions are beneficial for maintenance purposes or for isolating sections of the piping system.

These various types of duplex steel buttweld fittings provide flexibility in designing and constructing piping systems to meet the specific needs of different industries, including chemical processing, oil and gas, and marine engineering. The choice of fitting type depends on factors such as the flow requirements, pressure conditions, and the overall layout of the piping system. It's essential to follow industry standards and specifications when selecting and installing duplex steel buttweld fittings to ensure the integrity and reliability of the entire piping infrastructure.

Chemical Composition of Duplex Steel Buttweld Fittings

Duplex steel buttweld fittings are essential components in various industries, known for their superior corrosion resistance and mechanical properties. The chemical composition of duplex steel, which includes a combination of austenitic and ferritic phases, contributes to its remarkable performance. Typically, duplex steel contains significant amounts of chromium, nickel, molybdenum, and nitrogen.

Chromium, constituting around 22-26%, is a key element in duplex steel that enhances its corrosion resistance. This high chromium content forms a protective oxide layer on the surface, preventing corrosion in harsh environments. Nickel, ranging from 4-7%, promotes an austenitic microstructure, imparting toughness and ductility to the steel. The synergy of austenitic and ferritic phases provides a unique balance of strength and corrosion resistance.

Molybdenum, present in quantities of 3-5%, further enhances the corrosion resistance of duplex steel. It contributes to the steel's ability to withstand pitting and crevice corrosion, making it suitable for applications in aggressive chemical and chloride-rich environments. Additionally, molybdenum improves the overall strength of the material.

Nitrogen is another essential element in duplex steel, typically ranging from 0.1-0.3%. Nitrogen helps in stabilizing the austenitic phase and enhances the mechanical properties of the steel. It also contributes to the steel's ability to maintain corrosion resistance at elevated temperatures.

In addition to these primary alloying elements, duplex steel may contain small amounts of other elements like copper and tungsten, depending on the specific grade. Copper aids in improving the steel's resistance to sulfuric acid, while tungsten contributes to increased strength and stability.

The precise chemical composition may vary among different grades of duplex steel, such as Duplex 2205 or Super Duplex 2507, to meet specific application requirements. However, the fundamental combination of chromium, nickel, molybdenum, and nitrogen remains consistent across these grades, providing duplex steel buttweld fittings with a unique set of properties suitable for a wide range of industrial applications. The careful balance of these elements results in a material that excels in corrosive and demanding environments, making duplex steel buttweld fittings a preferred choice for critical piping systems in industries such as oil and gas, chemical processing, and marine engineering.

Mechanical Properties of Duplex Steel Buttweld Fittings

Duplex steel buttweld fittings are renowned not only for their corrosion resistance but also for their exceptional mechanical properties, making them well-suited for demanding industrial applications. The mechanical properties of duplex steel are a result of its dual-phase microstructure, combining both austenitic and ferritic structures.

One of the key mechanical advantages of duplex steel is its high tensile strength, which typically ranges from 620 to 900 megapascals (MPa), depending on the specific grade. This superior strength enables duplex steel buttweld fittings to withstand heavy loads and pressures in various industrial settings. The dual-phase structure contributes to the material's ability to resist deformation and enhances its overall durability.

Duplex steel also exhibits excellent impact toughness, making it resistant to brittle fracture and capable of withstanding sudden shocks or vibrations. This property is crucial in applications where the fittings may be subjected to dynamic loads or fluctuations in temperature. The combination of high strength and impact toughness makes duplex steel buttweld fittings reliable components for critical piping systems.

Furthermore, duplex steel offers good ductility and formability, allowing for ease of fabrication and installation. This characteristic is particularly advantageous in industries where complex piping configurations are common. The ability of duplex steel to be easily formed into various shapes without compromising its mechanical integrity contributes to its versatility in manufacturing processes.

In addition to its impressive tensile strength and impact toughness, duplex steel buttweld fittings also demonstrate excellent corrosion fatigue resistance. This property is essential in applications involving cyclic loading and exposure to corrosive environments. The resistance to corrosion fatigue ensures the long-term reliability of the fittings, even in conditions where other materials may succumb to degradation.

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Manufacturing Process Of Duplex Steel Buttweld Fittings

Specifications of Duplex Steel Buttweld Fittings

Specifications ASTM A815 / ASME SA815
Size Seamless Butt Weld Fittings: 1/2" - 10"
Welded Butt Weld Fittings: 1/2" - 48"
Thickness SCH10, SCH20, SCH30, STD SCH40, SCH60, XS, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, XXS available with NACE MR 01-75
Type DN15-DN1200
Dimensions ASME/ANSI B16.9, ASME B16.28, MSS-SP-43, BS4504, BS4504, BS1560, BS10
Bending Radius R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom MSS Sp-43 Stainless Steel Pipe Fitting
Size Range ½" NB to 24" NB in Sch 10s, 40s, 80s, 160s, XXS. (DN6~DN100) ASTM A815 Stainless Steel Buttweld Fitting
Elbows Angle : 22.5 deg, 30deg, 45 deg, 90 deg, 180 deg, 1.0D, 1.5D, 2.0D, 2.5D, 3D, 4D, 5D, 6D, 7D-40D .
Standard: ASME B16.9, ASME B16.28, ASME B16.25, MSS SP-75 DIN2605 JISB2311 JISB2312 JISB2313, BS, GB, ISO
Connection Welding
Manufacturing process Forge, Cast, Push, Press, etc.
Key markets and industries Bitumen upgraders.
Heavy oil refineries.
Petrochemicals and acids.
Nuclear power (mostly seamless).
Test Certificates EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Specialized manufacturer of 90º Elbows, 45º Elbows, Tees, Crosses, Reducers, Pipe Cap, Stub End, Pipe Bend
We provide Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175

Types Of Duplex Steel Welded Fittings

Duplex Steel 90 Degree Elbow

Duplex Steel 90 Degree Elbow

Duplex 45 Degree Elbow

Duplex 45 Degree Elbow

Duplex Steel Long Radius Elbow

Duplex Long Radius Elbow

Duplex Steel Short Radius Elbow

Duplex Steel Short Radius Elbow

Duplex Concentric Reducer

Duplex Concentric Reducer

Duplex Stainless Steel Eccentric Reducer

Duplex Steel Eccentric Reducer

ASTM A815 Duplex Stainless Steel Pipe Bend

Duplex Stainless Steel Pipe Bend

Duplex Steel Tee

Duplex Steel Tee

Duplex Steel Cross

Duplex Steel Cross

Duplex Stainless Steel Stub End

Duplex Stainless Steel Stub End

Duplex Pipe Cap

Duplex Pipe Cap

ASME SA815 DSS Pipe Nipple

DSS Pipe Nipple

Other Types Of Duplex Seamless Fittings

  • DSS Schedule 10 Two Joint Pipe Fittings
  • Duplex Steel 90° Weldable SR Elbow
  • Welded Fittings
  • DSS Schedule 40 180° LR Return Bend
  • DSS Seamless Pipe Elbow
  • Buttweld Fittings
  • Buttweld Pipe Fittings
  • Duplex Stub End
  • Duplex Elbow
  • Duplex Stainless Steel Reducer
  • ASTM A815 Duplex Steel 45 Degree Elbow
  • Duplex Steel Seamless Fittings
  • Duplex Seamless Pipe Bend
  • 2 inch Duplex Stainless Steel Pipe Fittings
  • Duplex Pipe Fittings
  • DSS Sch 10 Lateral Tee
  • End Pipe Cap
  • Duplex Steel U Bend
  • Duplex Steel 180 Degree Elbow
  • Duplex Steel Weldable 3D Elbow
  • DSS Schedule 40 Pipe Reducer
  • Duplex SR Elbow
  • ASTM A815 45° Long Radius Elbow
  • ASME B16.9 Duplex Steel 1D Elbow
  • Duplex Stainless Steel Lap Joint Stub End
  • Duplex Pipe End Cap
  • Duplex Steel Equal Cross
  • ASME SA815 Duplex Stainless Steel Buttweld Cap
  • Duplex Reducing Tee
  • MSS-SP-75 DSS Buttweld Pipe Fittings

Ask Free Sample of DSS Elbow, Tee, Reducer, Stub End Please Call On   +91 9594327775 Or Mail Us On subhash@sheetalindustries.com

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Buttweld Fittings Price, Dimension, Weight

DSS Buttweld Fittings Industrial Application

Oil & Gas Industry

Oil & Gas Industry

Chemical Industry

Chemical Industry

Power Generation Industry

Power Generation Industry

Construction Industry

Construction Industry

Shipbuilding Industry

Shipbuilding Industry

Automotive Industry

Automotive Industry

Food Industry

Food Industry

Textile Industry

Textile Industry

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