Super Duplex Stainless Steel Pipe and Pipe Fittings
Super Duplex Stainless Steel
Super Duplex Stainless Steel Pipe and Pipe Fittings
At Ashapura Steel, we pride ourselves on offering an extensive range of super duplex stainless steel pipes and fittings designed to excel in the harshest environments. Renowned for their exceptional durability and superior corrosion resistance, our products are the preferred choice for various critical applications across numerous industries.
Superior Material Composition
Crafted from a unique combination of austenitic and ferritic stainless steel, our super duplex pipes and fittings exhibit unparalleled strength and corrosion resistance. With higher chromium, molybdenum, and nitrogen content compared to standard duplex stainless steel, they deliver enhanced performance, making them ideal for demanding environments.
Diverse Grades for Varied Applications
Ashapura Steel provides a variety of super duplex stainless steel grades including S32750, S32760, and S32550, catering to diverse applications in industries like oil and gas, chemical processing, and marine. Each grade is selected based on specific requirements such as strength, corrosion resistance, and application suitability.
Excellent Heat Resistance
Beyond their exceptional corrosion resistance, our super duplex stainless steel pipes and fittings offer excellent heat resistance, making them suitable for high-temperature applications. This versatility ensures optimal performance in industries like oil and gas, chemical processing, and desalination.
ASTM A Steel Pipe Specifications for Super Duplex Stainless Steel Pipes
ASTM A312 Specification
ASTM A312 is the most commonly used specification for super duplex stainless steel pipes, covering seamless, straight-seam welded, and heavily cold-worked welded austenitic stainless steels intended for high-temperature and general corrosive service.
Austenitic stainless steels are known for their excellent corrosion resistance and high-temperature strength. They contain a minimum of 16% chromium and 6% nickel, along with other elements such as molybdenum and nitrogen. These alloys are non-magnetic in the annealed condition but can become slightly magnetic after cold working.
The ASTM A312 specification covers a wide range of austenitic grades, including TP304/304L, TP316/316L, TP321/321H, TP347/347H, and many others. The “TP” prefix stands for “Type,” followed by a number that indicates the nominal composition of the alloy.
ASME B36.19M Standard
Complementing ASTM A312 is ASME B36.19M, which covers the dimensions and tolerances of stainless steel pipes. This standard specifies various types of end finishes, such as plain ends, beveled ends, threaded ends, and grooved ends. It also provides guidelines for marking and identification of pipes, including size, schedule, material grade, heat number, and manufacturer’s name or trademark.
A106 Gr.B vs. ASTM A312
While ASTM A312 is the most common specification for super duplex stainless steel pipes, other standards can also apply depending on the specific application requirements. For instance, A106 Gr.B is a carbon steel pipe specification widely used in low-pressure applications such as water wells and gas lines. A106 Gr.B has different chemical composition requirements than austenitic stainless steels and lower corrosion resistance but can be more cost-effective in certain cases.
Types of Super Duplex Fittings
Buttweld Fittings
Buttweld fittings are among the most common types of super duplex fittings used in pipelines. These fittings are welded directly onto the pipe using a butt welding process and come in various shapes such as elbows, tees, reducers, caps, and stub ends. They are available in different sizes ranging from 1/2 inch to 48 inches.
Threaded Fittings
Threaded fittings feature threads on their interior or exterior surface, allowing them to be screwed onto pipes or other components without welding. Common shapes include elbows, tees, couplings, unions, plugs, and bushings.
Socket Weld Fittings
Socket weld fittings have a socket at one end for easier insertion into pipes or other components before welding takes place. They come in various shapes such as elbows, tees, couplings, unions, and reducing inserts.
Flanges
Flanges are used to connect pipes or valves together with bolts and nuts, forming a tight seal when tightened against each other with gaskets in between. Flanges are classified into several types based on their design, including slip-on flanges (SO), weld neck flanges (WN), blind flanges (BL), lap joint flanges (LJ), socket weld flanges (SW), and threaded flanges.
Super Duplex Stainless Steel Pipes and Pipe Fittings Specifications
| Standard Specification | ASME, ASTM, AISI, AMS, JIS, EN, SAE, DIN, NF, TOCT, DS, DTD, GB |
|---|---|
| Super Duplex Seamless Pipe Size | "OD: 4 to 219mm Wall Thickness: 0.5 to 20mm" |
| 2507 Duplex Stainless Steel Welded Pipe Size | OD: 5.0 - 1219.2 mm |
| Super Duplex 2507 EFW Pipe Size | OD: 5.0 - 1219.2 mm |
| Super Duplex Stainless Steel Pipe WT | SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| 25cr Super Duplex 2507 Pipe manufacturing techniques | Seamless / ERW / EFW/ Welded / Fabricated / CDW/ LSAW/ Seam-Welded / Redrawn |
| Origin of Duplex 2507 Stainless Steel pipe material | Indian, European, Korean, Japanese |
| 2507 Duplex SS Pipe End Types | "BE : Beveled end BBE : Bevel both ends BLE : Bevel large end BSE : Bevel small end TOE / POE = Treaded One End / Plain One End TOE / BOE = Treaded One End / Beveled One End POE / BOE = Plain One End / Beveled One End TBE = Treaded Both Ends PBE = Plain Both Ends" |
| Form | Round, Square, Rectangular |
| Super Duplex Alloy 2507 Pipe Length | Single Random, Double Random & Required Length End: Plain End, Beveled End, Treaded |
| 2507 Super Duplex Stainless Steel Pipe Delivery Condition | Annealed and Pickled, Hot Finished, Polished, Bright Annealed, Cold Drawn |
Sizes of ASTM A815 UNS S32750 Fittings
| Seamless | Welded | |
|---|---|---|
| Elbows | Upto 24" | Upto 42" |
| Tees | Upto 24" | Upto 36" |
| Reducers | Upto 24" | Upto 48" |
| End Caps | Upto 24" | - |
| Return Bends | Upto 8" | - |
| Cross | Upto 8" | Upto 36" |
| Swage Nipple | Upto 4" | - |
| Special Fittings: Piggable Bends, 3D, 5D, 10D etc. Customized Bends, Miter Bends | As per customer drawings and datasheets | - |
| Thickness | Sch 5, Sch 5s, Sch 10, Sch 10s, Sch 20, Sch 30, Sch 40s, Sch 40, Sch STD, Sch 60, Sch 80s, Sch 100, Sch 120, Sch XS, Sch XXS, Sch 160, upto 50mm in case of welded fittings | - |
Super Duplex Stainless Steel Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| S32750 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
Super Duplex Stainless Steel Mechanical Properties
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
|---|---|---|---|---|
| S32750 / S32760 | 7.8 | 0.281 | 1350 | 2460 |
