Alloy 825

Alloy 825, commonly known as INCOLOY® 825, is a nickel-iron- chromium alloy with additions of molybdenum and copper. It is similar to alloy 800 but has improved resistance to aqueous corrosion. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulfuric and phosphoric acids. This nickel steel alloy is used for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production, and pickling equipment.

UNS: N08825
Stock Sizes: 1/8” – 1” OD


  • Seamless Tube: ASTM B163/B423
  • NACE MR0175/MR0103

Available Processing:

  • Cold Worked and Bright Annealed

Common Testing: Eddy Current, Flare, Flattening, Positive Material Identification

Chemical Composition (%)

Iron (Fe)22% Min
Chromium (Cr)19.5-23.5%
Nickel (Ni)38-46%
Manganese (Mn)1% Max
Silicon (Si)0.5% Max
Copper (Cu)1.5-3.0%
Carbon (C)0.05% Max
Sulfur (S)0.03% Max
Aluminum (Al)0.2% Max
Titanium (Ti)0.6-1.2%
Molybdenum (Mo)2.5-3.5%

Physical Properties

Density (lb/in3)0.294
Elongation (min %)30
Minimum Yield (psi)35,000
Minimum Tensile (psi)85,000
Max Hardness (HRB)90