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UNS N08028(Alloy 28)
Short Introduction:
Alloy 28/UNS N08028/W. Nr. 1.4563 is a nickel-iron-chromium alloy with additions of molybdenum and copper. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localise attack such as pitting and crevice corrosion. The alloy are especially resistant to sulphuric and phosphoric acid. Used for chemical processing, pollution control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production and pickling equipment.
Material grades and equivalents Alloy 28/UNS N08028/W. Nr. 1.4563/X1NiCrMoCuN31-27-4
Special properties:
Good resistance against sulphuric and phosphoric acids. High resistance to localized corrosion such as pitting and crevice corrosion, as well as to stress-corrosion.
ASTM B 668, EN 10216-5, SEW 400 (Feb 1991), SS 14 25 84,NFA 49-217
Plate, sheet and strip
ASTM B 709, EN 10088-2, SS 14 25 84
Bar steel
EN 10088-3, EN 10272, SS 14 25 84
Fittings
ASTM A 403 (chemical composition and mechanical properties according to ASTM B668)
Alloy 28 Applications:
Alloy28 was initially developed to solve the wet-process phosphoric acid heat exchanger material. Its excellent corrosion resistance to enable it to H2S, chloride, phosphoric acid and sulfuric acid corrosion resistance, widely used in high H2S content in the oil and gas field exploitation, flue gas desulfurization system, Seawater and chloride-bearing cooling water, papermaking industry, phosphoric acid and organic acid and ester synthesis production device, is a ideal material used to replace graphite heat exchanger in the concentrated phosphoric acid.
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