Alloy 28 Pipes – ASTM B668 / ASME SB668

ASTM B668 Alloy 28 Pipes, UNS N08028 / WNR 1.4563 Alloy 28 Seamless Pipes, Alloy 28 Welded Pipes Manufacturer, Exporter & Suppliers in India.

We at Solitaire Overseas offer a comprehensive range of ASTM B668 Alloy 28 Seamless Pipes, which are manufactured using high-quality raw materials. As a leading manufacturer and supplier, we produce Alloy 28 pipes known for their exceptional strength at high temperatures and their robust ability to resist oxidation, carburization, and various forms of high-temperature corrosion. All our products consistently meet or exceed industry standards, conforming to specifications from bodies such as API, ASTM, ASME, and ANSI, as well as other national and international standards. These pipes are offered in a variety of sizes, specifications, grades, and thicknesses to meet diverse client requirements. They are extensively utilized across applications like oil & gas, power plants, shipbuilding, heavy engineering industries, nuclear fuel reprocessing, and acid production and pickling equipment.

Solitaire Overseas is recognized as a major manufacturer of high-quality Alloy 28 Pipes & Tubes. This material, identified as UNS N08028 (or W. Nr. 1.4563), is a nickel-iron-chromium alloy enriched with additions of copper and molybdenum. This unique composition grants it excellent resistance to both oxidizing and reducing acids, as well as to stress-corrosion cracking and localized attacks like pitting and crevice corrosion. The alloy is particularly effective against phosphoric and sulfuric acid.

We manufacture ASTM B668 Alloy 28 Pipes & Tubes with a commitment to quality, utilizing top-tier raw materials and undergoing rigorous testing at every production stage to ensure no compromise on quality. Alloy 28 is essentially a Stainless Steel Alloy prized for its high corrosion resistance across virtually any environment. Alloy 28 Seamless Pipes and cold-worked tubes are employed in critical applications such as pollution control equipment, chemical processing, nuclear fuel reprocessing, oil and gas well piping, and acid production and pickling equipment. Notably, our Alloy 28 tubes are often cold-worked to high strength levels for demanding downhole services in moderately corrosive deep, sour gas wells, and are available at competitive prices in India.

Table of Contents

• Alloy 28 Pipes Specifications
• ASTM B668 Alloy 28 Pipes Chemical Composition
• Alloy 28 Pipes Mechanical Properties
• UNS N08028 Alloy 28 Pipes Physical Properties
• Equivalent Grades of Alloy 28 Pipes
• Types of Alloy 28 Pipes & Tubes
• Applications of Alloy 28 Pipes
• Related Products

Alloy 28 Pipes Specifications

The following table summarizes the typical specifications under which UNS N08028 Alloy 28 pipes are supplied. These specifications dictate the manufacturing methods, size limitations, and dimensional standards for corrosive service applications.

ASTM B668 Alloy 28 Pipes Chemical Composition

Alloy 28 is a nickel-iron-chromium super-austenitic steel, and its enhanced corrosion resistance is directly attributable to its high nickel, chromium, and molybdenum content. The table below outlines the maximum or range percentages for the primary elements as per industry standards for this grade.

Alloy 28 Pipes Mechanical Properties

The high strength and good ductility of Alloy 28 allow it to perform reliably under high-pressure, high-temperature (HPHT) conditions. These properties are typically tested in the annealed condition to ensure minimum material performance standards are met.

UNS N08028 Alloy 28 Pipes Physical Properties

The physical properties listed here define how Alloy 28 behaves in terms of density, heat transfer, and elastic response to stress. These values are crucial for system design, especially in heat exchangers and high-pressure fluid systems.

Equivalent Grades of Alloy 28 Pipes

To ensure consistency in material selection globally, Alloy 28 is cross-referenced under several international standards. This table lists the common equivalent grades and designations used around the world.

Types of Alloy 28 Pipes & Tubes

Alloy 28 is available in various product forms to suit different manufacturing and application needs from straight piping runs to complex pressure vessel fabrication. The following list details the range of products commonly supplied in this high-performance alloy.

Applications of Alloy 28 Pipes

Alloy 28 (UNS N08028) pipes and tubes are super-austenitic stainless steel products specifically designed for use in extremely corrosive environments where standard stainless steels fail. Its high resistance to strong acids and localized corrosion makes it vital in the following applications:

• Chemical and Petrochemical Processing: Used extensively in equipment handling strong mineral acids, especially sulfuric acid and phosphoric acid, including contaminated or hot solutions.
• Nuclear Fuel Reprocessing: Employed in demanding chemical processes involving highly corrosive media within nuclear facilities.
• Oil and Gas Production (Sour Gas Service): Ideal for downhole services and piping in moderately corrosive deep, sour gas wells (high H2S and CO2 content) where high strength and stress-corrosion cracking resistance are mandatory.
• Acid Production and Pickling Equipment: Used in components like tanks, heat exchangers, pumps, and piping for pickling baths (e.g., in steel industries) and in the manufacturing of various acids.
• Heat Exchangers and Evaporators: Components operating with corrosive fluids, such as those in the fertilizer industry or desalination plants, where high chloride levels pose a threat to conventional alloys.
• Pollution Control Equipment: Utilized in components like scrubbers and flue gas desulfurization (FGD) systems that handle aggressive, wet acid condensates.
• Marine and Seawater Applications: Used in systems exposed to high-chloride environments due to its excellent pitting and crevice corrosion resistance.

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