Alloy 28 Pipes is a tough Austenitic Stainless Steel resistant to harsh environments where other grades of stainless steel fail. It is particularly noteworthy for high resistance to stress corrosion cracking in media containing chlorides in both environments that are highly corrosive in nature and in environments with high concentrations of hydrogen ions. It also retains a high level of strength at elevated temperatures and is intended for use in environments where strength and stability coexist. Note that a word of caution is necessary in this respect in that exposure to high temperatures may lead to the formation of intermetallic compounds.
Provided in seamless, welded, ERW, and EFW forms, Alloy 28 Pipes can be used for a variety of purposes. They can be found in the field of oil and gas processing, chemical and petrochemical processing, offshore platforms, fertilizer production units, heat exchangers, and desalination plants. They can be recognized for their good fabricability properties � those of easy welding and formability � making them ideal for complex piping systems and high-pressure vessels. Alloy 28 pipes can be considered an optimal material for use in sulfuric and phosphoric acids, hydrocarbon processing, or any other kind of corrosive media.
Table of Contents
- Alloy 28 / N08028/ 1.4563 / Incoloy Alloy 28 Pipe Specification
- Alloy 28 Pipe Chemical Composition
- ASME SB668 Alloy 28 Pipes Mechanical Properties
- Alloy UNS N08028 Pipes Equivalent Grades
- Types of Alloy 28 Pipes
- Manufacturing Process of Alloy 28 Pipes
- Applications & Usage of Alloy 28 Pipes
- Frequently Asked Questions (FAQs)
Alloy 28 / N08028/ 1.4563 / Incoloy Alloy 28 Pipe Specification
| Parameter | Details |
| Seamless Pipes Standards | ASTM B668, EN 10216-5, SEW 400 (Feb 1991), SS 14 25 84, NFA 49-217 |
| Size Range | 1/4" NB to 6" NB (Customized sizes available) |
| Type | Seamless / Welded / ERW |
| Thickness | SCH 10 to SCH 80 |
| OD for Seamless Pipes | 1/2" NB to 300" NB |
| OD for ERW Pipe | 1/2" NB to 600" NB |
| OD for EFW Pipe | 6" NB to 300" NB |
| Form | Round Pipes, Square Pipes, Rectangular Pipes |
Alloy 28 Pipe Chemical Composition
| Grade | %C | %Si | %Mn | %P | %S | %Cr | %Mo | %Ni | %N | %Cu |
| Alloy 28 | 0.020 | 0.70 | 2.00 | 0.03 | 0.01 | 26.0�28.0 | 3.00�4.00 | 30.0�32.0 | 0.11 | 0.70�1.50 |
ASME SB668 Alloy 28 Pipes Mechanical Properties
| Grade | Tensile Strength Rm? (N/mm2) | 0.2% Yield Strength Rp?= (N/mm2) | Elongation A5?= (%) | Hardness (HB=) | Modulus of Elasticity (kN/mm2) |
| Alloy 28 | 500 - 750 | 220 | 35 / 30 | 230 | 195 |
Alloy UNS N08028 Pipes Equivalent Grades
| Grade | UNS Number | Werkstoff Nr. | EN Designation |
| Alloy 28 | N08028 | 1.4563 | X1NiCrMoCuN31-27-4 |
Types of Alloy 28 Pipes
Alloy 28 ERW Pipes
Alloy 28 ERW Tubes
Alloy 28 Seamless Pipes
Alloy 28 Seamless Tubes
Alloy 28 Welded Pipes
Alloy 28 Welded Tubes
Manufacturing Process of Alloy 28 Pipes
High-technology metallurgical control and fineness forming methods are used to produce Alloy 28 Pipes, which provide high levels of corrosion resistance, mechanical strength, thermal stability, and service life in aggressive chemical and marine conditions.
- Selection of Raw Materials
Nickel-iron-chromium alloying components with precise additions of molybdenum, copper as well as nitrogen are chosen to guarantee a high level of pitting, crevice corrosion, stress corrosion cracking and acidic media resistance. - Melting & Refining Process
Vacuum Induction Melting (VIM) and Vacuum Arc Remelting (VAR) are used to melt alloy 28 to obtain clean metallurgy, homogenous chemical composition, and improved mechanical properties with minimal inclusions and segregation. - Billet Preparation
Refined alloy ingots are hot processed by forging, rolling or extrusion to perfect the grain structure, enhance toughness and facilitate smoothly welded billets to be used in producing seamless pipes. - Pipe Forming
Alloy 28 Pipes are produced through seamless extrusion or fabricated with the use of welding. Hot extrusion and cold drawing are used to make seamless pipes whereas welded pipes are made through TIG welding or laser welding so that the weld seams are strong and defect free. - Cold Working & Sizing
Cold drawing and cold rolling are used to attain very tight dimensional tolerances, uniform wall, improved surface finish and increased mechanical strength. - Heat Treatment & Annealing
To allow solution annealing and controlled cooling to be performed to help remove internal stresses, restore ductility and to achieve maximum corrosion resistance so that it can ensure stable performance under different pressure and temperature conditions. - Testing & Quality Control
Alloy 28 Pipes are strictly tested, such as ultrasonic testing, eddy current testing, hydrostatic testing, and dimensional testing that meet the ASTM, ASME, EN, and other international standards.
Applications & Usage of Alloy 28 Pipes
Alloy 28 Pipes are commonly utilized in industries that require superior levels of resistance against corrosion, sound mechanically, and endurance against extremely fierce surroundings.
- Chemical Processing Industry
Alloy 28 Pipes find wide application in reactors, heat exchangers, condensers, and process piping systems that deal with sulfuric acid, phosphoric acid, chlorides, and oxidizing chemical media. - Marine & Offshore Industry
Alloy 28 Pipes are applied in offshore platforms, seawater cooling, desalination, and marine piping applications due to their outstanding resistance towards seawater corrosion and stress corrosion cracking. - Oil & Gas Industry
Alloy 28 is used in sour gas service, offshore pipes, heat exchangers and processing equipment subjected to the chlorides, hydrogen sulfide and high-pressure working conditions. - Power Generation Industry
Applied in condensers, cooling water systems and heat exchangers in thermal and nuclear power plants where corrosion, erosion and high temperature resistance are needed. - Phosphoric acid and fertilizer plants
The usage of Alloy 28 Pipes is common in manufacturing phosphoric acid plants, fertilizer plants and associated chemical processing plants because of the exceptional resistance to acidic environment. - Pulp & Paper Industry
Used in bleaching plants, digesters and chemical recovery systems where aggressive chemicals and high temperatures are the norm and where high corrosion resistance is required. - Water Treatment and Desalination
The Alloy 28 Pipes are used in reverse osmosis plants, brine heaters, evaporators and pipelines where saline water resistance and aggressive treatment chemicals are important.
Frequently Asked Questions (FAQs)
Alloy 28 Pipes are used in chemical processing, oil & gas, offshore, and power plants where high corrosion resistance is required.
Yes, Alloy 28 generally offers better resistance to chlorides and stress corrosion cracking than Alloy 28, especially in harsh environments.
Alloy 28 has much higher corrosion resistance than stainless steel, especially against acids and chlorides, making it suitable for more aggressive conditions.
Yes, Alloy 28 Pipes are well-suited for seawater and offshore use due to their excellent resistance to seawater corrosion and pitting.
Alloy 2 Pipes can operate at high temperatures and pressures, with exact limits depending on pipe size, wall thickness, and applicable standards.
Other types of Alloy 28 Pipes
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