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Alloy 28

Wst. 1.4563

UNS N08028

Stock program: Some sizes on stock, mainly on request

Specification: ASTM B668 / EN 10216-5

Maximum expose temperature: 600°C / 1110°F


Alloy 28 is a nickel-iron-chromium alloy with additions of molybdenum and copper. It has a high resistance to pitting, cursive corrosion and to stress-corrosion. Developed as a material for service in highly aggressive and corrosive environments, this alloy is especially resistant to sulfuric and phosphoric acid. The alloy 28 has a similar specification as alloy 825 tubes.


Characteristics

  • Excellent abrasion and corrosion resistance
  • Very good resistance to oxidizing media and strong acids
  • Good resistance to sulphide cracking
  • High resistance to inter granular, pitting and crevice corrosion
  • Good weld ability and formability

Market applications:

  • Chemical processing
  • Oil and gas industry
  • Pollution control equipment
  • Acid production
  • Hydraulic systems

Technical details

Technical composition (%) Fe Cr Ni Mo Mn Cu Si P N C S
28 min   Bal.   21.0   4.5   2.5   -   -   -   -   0.08   -   -
  max   -   23.0   6.5   3.5   2.00   1.0   1.00   0.030   0.20   0.030   0.020
Mechanical properties 28
Tensile strenght (mpa, min)   550 - 750
Yield strength (0.2% offset mpa, min)   220 - 250
Elongation (%, min)   40
Density / weight (g / cm3 / kg)   7.9

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