Duplex stainless steel forged fittings are a type of pipe fittings that are widely used in piping systems. These fittings are made from duplex steel, which is a combination of austenitic and ferritic stainless steels. Duplex steel forged fittings offer excellent corrosion resistance, high strength, and good weldability. They are commonly used in applications where high pressure, high temperature, and corrosive environments are present.
Duplex stainless steel forged fittings come in various types such as duplex steel forged pipe fittings, duplex steel forged elbow, duplex steel socket weld fittings, duplex steel threaded fittings, and more. Each type has its own unique features and benefits depending on the application requirements.
One of the advantages of using duplex stainless steel forged fittings is their ability to withstand extreme temperatures and pressures without compromising their integrity. This makes them ideal for use in critical applications such as oil and gas production facilities, chemical processing plants, and power generation facilities.
Another benefit of using duplex stainless steel forged fittings is their superior corrosion resistance compared to other materials such as carbon steel or standard stainless steels. This means they can be used in harsh environments where other materials would quickly corrode or fail.
Standard Specifications of Duplex Stainless Steel ASTM A Forged Pipe Fittings
ASTM A182 is the standard specification for forged or rolled alloy-steel pipe fittings that are used in high-temperature services. This specification covers various grades of stainless steel, including duplex and super duplex steel. These materials have excellent corrosion resistance properties, which make them suitable for use in harsh environments.
Duplex Steel ASTM A182 F51
Duplex steel ASTM A182 F51 is a type of duplex stainless steel that has a high level of strength and corrosion resistance. It contains 22% chromium, 5% nickel, and 3% molybdenum, which gives it superior properties compared to other types of stainless steel. The material is commonly used in the oil and gas industry for applications such as pipelines, valves, and fittings.
ASTM A182 Specifications
The ASTM A182 specification covers several grades of alloy-steel forgings for high-temperature services. These include grades F1 through F91, which cover low-alloy steels with different chemical compositions suitable for various applications.
ASME B16 Standards
The ASME B16 standards cover various aspects of piping, including dimensions, tolerances, materials, and testing. These standards are used by engineers and designers to ensure that piping systems are safe, reliable, and efficient.
ANSI Standards
The ANSI standards cover a wide range of topics related to engineering and manufacturing. These include standards for materials, processes, equipment, and safety. The ANSI B16 standard covers pipe flanges and fittings dimensions.
Types of Duplex Stainless Steel Forged Fittings
Duplex Steel Elbows
Duplex steel elbows are one of the most commonly used types of duplex stainless steel forged fittings. These elbows have a 90-degree bend and are used to change the direction of flow in pipelines or plumbing systems. They come in different sizes and thicknesses to suit various applications.
One advantage of using duplex steel elbows is their excellent corrosion resistance properties, making them ideal for use in harsh environments such as offshore oil rigs or chemical plants.
Duplex Steel Tees
Duplex steel tees are another type of duplex stainless steel forged fitting that is widely used in various industries. These tees have a T-shaped design and are used to combine or split fluid flow in pipelines or plumbing systems.
Like duplex steel elbows, these tees also offer excellent corrosion resistance properties, making them suitable for use in harsh environments where exposure to corrosive substances is common.
Duplex Steel Couplings
Duplex steel couplings are designed to connect two pipes together without the need for welding or threading. These couplings can be easily installed and removed, making them ideal for use in temporary piping systems or situations where frequent maintenance is required.
Duplex steel couplings come in different sizes and designs to suit various applications. They offer excellent corrosion resistance properties, making them suitable for use in harsh environments.
Duplex Steel Crosses
Duplex steel crosses are similar to duplex steel tees but have four branches instead of three. These crosses are used to combine or split fluid flow in pipelines or plumbing systems that require more than two connections.
Like other types of duplex stainless steel forged fittings, these crosses offer excellent corrosion resistance properties, making them suitable for use in harsh environments.
Duplex Steel Caps
Duplex steel caps are used to seal the end of a pipe or fitting. These caps come in different sizes and designs to suit various applications. They offer excellent corrosion resistance properties, making them ideal for use in harsh environments where exposure to corrosive substances is common.
Duplex Steel Reducers
Duplex steel reducers are used to connect pipes with different diameters together. These reducers come in different sizes and designs to suit various applications. One advantage of using duplex steel reducers is their excellent mechanical properties, which make them ideal for use in high-pressure piping systems.
Benefits of Using Duplex Stainless Steel Forged Fittings
Resistance to Corrosion
One of the most significant benefits of using duplex stainless steel forged fittings is their exceptional resistance to corrosion. These fittings are designed to withstand harsh environments and corrosive media, making them ideal for use in a wide range of industrial applications.
The high level of chromium and molybdenum content in duplex stainless steel provides excellent resistance to both uniform and localized corrosion. This means that these fittings can be used in highly corrosive environments such as offshore oil rigs, chemical plants, and desalination plants.
Strength and Durability
Duplex stainless steel forged fittings are also known for their strength and durability. They are designed to withstand high pressure, extreme temperatures, and heavy loads without deforming or breaking. This makes them ideal for use in critical applications where failure is not an option.
Cost-Effective Solution
While duplex stainless steel forged fittings may cost more upfront than other materials such as carbon steel or standard stainless steel, they offer long-term cost savings due to their durability and resistance to corrosion. In addition, they require less maintenance over time, reducing overall operating costs.
Versatility
Duplex stainless steel forged fittings are versatile enough to be used in a wide range of applications across various industries such as oil & gas, chemical processing plants, marine engineering projects etc.. They come in different shapes (elbows, tees etc.) which allows them to fit into any piping system easily.
Duplex Forged Fittings
Specification
| Specifications | ASTM A182 / ASME SA182 |
|---|---|
| Duplex Stainless Steel Forged Fitting 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 |
| Duplex Stainless Forged Fitting Types | Seamless / Welded / ERW / Fabricated Duplex SS Forged Fitting |
| ASTM A182 Duplex Steel Forged Fitting Dimensions | ASME 16.11, MSS SP-79, 83, 95, 97, BS 3799 |
| SA182 Duplex Steel Forged Fitting Type | DN15-DN1200 |
| Duplex Steel Forged Fittings Thread | NPT, BSPT, BSPP |
| Duplex Steel Forged Fittings Pressure Rating | 2000lb/ 3000lb/ 6000lbs /9000lbs |
| Connection | Welding |
| Bending Radius | R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom Duplex SS Forged Fitting |
| Stainless Steel Duplex Forged Fitting Size Range | 1/2″ NB to 24″ NB in Sch 10s, 40s, 80s, 160s, XXS. (DN6-DN100) |
| Duplex Steel Elbow | “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 |JSB2311 |JSB2312 |JSB2313, BS, GB, ISO” |
Duplex Forged Pipe Fittings
| A182 Duplex Forged Equal Cross | ASTM A182 Duplex Steel Forged Tee |
|---|---|
| ASTM A182 Duplex Steel Forged Threaded Outlet (Npt) | Forged ASTM A182 Duplex 3000 (3m) Bspp Fittings |
| ASTM A182 Duplex Steel Forged Coupling | Forged ASTM A182 Duplex Steel 3000 (3m) Bspt Fittings |
| Forged Stainless Steel Duplex Street Elbow | A182 Duplex Steel Forged Cross |
| Forged A182 Duplex Steel 3000 (3m) Fittings | Duplex Stainless 3000 (3m) Forged Npt Fittings |
| Forged ASTM A182 Duplex Steel 6000 (6m) Npt Fittings | Forged DSS Elbow |
| SA182 Duplex Steel 6000 (6m) Forged Fittings | Forged Stainless Steel Duplex 6000 (6m) Bspt Fittings |
| Stainless Steel Duplex Forged Half Coupling | Forged ASTM A182 Duplex Steel Plug |
| SA182 Duplex Steel 3000 (3m) Forged Fittings | Duplex Forged Socketweld Outlet |
| Duplex 6000 (6m) Forged Fittings | Forged Duplex Stainless Steel Round Head Plug |
| Duplex 6000 (6m) Forged Fittings | Forged Duplex Stainless Steel Round Head Plug |
| ASTM A182 Duplex Steel Forged 45° Elbow | Forged Duplex Stainless Steel 90° Elbow |
| ASTM A182 Duplex Forged Square Head Plug | Forged DSS Equal Tee |
| Duplex Forged Nipple | Duplex Stainless Forged Outlet Fitting |
| Duplex Stainless Steel Forged Full Coupling | ASTM A182 Duplex Steel Forged Outlet |
| Forged DSS Hex Head Plug | ASTM A182 Duplex Forged Union |
| Forged Duplex Stainless Steel Reducing Tee | Stainless Steel Duplex Forged End Cap |
| ASTM A182 Duplex Steel Forged Pipe Nipple | Duplex Stainless Forged Hex Nipple |
| DSS Forged Reducing Hex Nipple | – |
Duplex Steel Forged Fittings
Manufacturing Standards
| ASTM A182 – ASME SA182 | Standard Specification for Wrought Austenitic Duplex Steel Piping Fittings |
|---|---|
| ASME B16.11 | Socket Welding and Threaded Forged Fittings |
| MSS SP-43 | Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications |
| MSS SP-95 | Swage(d) Nipples and Bull Plugs |
| BS3799 | Specification for Steel pipe fittings, screwed and Socket-welding for the petroleum industry |
Duplex Steel Forged Fittings
Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 2.50 – 3.50 | 4.50 – 6.50 | 0.8 – 0.20 | 63.54 min |
Duplex Steel Forged Fittings
Mechanical Properties of ASTM A182
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
|---|---|---|---|---|
| S31803 / S32205 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
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