Application Segments

Oil & Gas/CPI

Melting Route


Product Description

BÖHLER A959 (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 localized attack such as pitting and crevice corrosion. The alloy is especially resistant to sulphuric and phosphoric acid. Equipment used for chemical processing, pollution control equipment, oil and gas well piping ,natural gas and oil transportation, nuclear fuel reprocessing and transportation, acid production and pickling equipment and transportation
The alloy was originally developed for use in the manufacture of phosphoric acid, especially for heat exchangers in the concentration unit, where corrosive conditions are at their worst.

Technical Specifications

Material Numbers

Alloy 28 1.4563 X1NiCrMoCu31-27-4 N08028



Chemical Composition

Chemical composition (average %)
max. 0.020 max. 0.70 max. 2.00 max. 0.030 max. 0.010 26.0 to 28.0 3.0 to 4.0 30.0 to 32.0 0.70 to 1.50 max. 0.10

Available product shapes

  • Long Products


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