What Kind Of Alloy Is Incoloy800 (N08800)?

So what is Incoloy800?

Incoloy800 is an alloy with Cr content usually 15-25%, nickel content 30-45%, and a small amount of aluminum and titanium.

Incoloy800 UNS N08800 Tubings

The Cr content in incoloy800 alloy is usually 15-25%, nickel content is 30-45%, and contains a small amount of aluminum and titanium.

The 800 alloy is in the austenite single zone after high temperature and rapid cooling, so the use state is a single austenite structure. The alloy has a high chromium content and a sufficient nickel content, so it has a high resistance to high temperature corrosion, and is widely used in industry.

It has excellent resistance to stress corrosion cracking in chloride, low-concentration NaOH aqueous solution and high-temperature and high-pressure water.

Mechanical properties and physical properties of Incoloy800

The mechanical properties are shown in the table below:


σb / MPa

σ0.21 / MPa

δ5 / %

100 425 140 160
300 390 95 115
500 360 80 100
600 300 75 95

Application temperature range

  • N08800: ≤600 ℃,
  • N08810: 600-950℃,
  • N08811: 700-1000℃.

N08800, UNS N08800 alloy is a nickel-iron-chromium-iron nickel-based corrosion-resistant and heat-resistant alloy, with high strength, oxidation resistance, corrosion resistance, oxidation resistance, carbonization, nitriding, and good creep strength.

The product has excellent mechanical properties at sub-zero, room temperature and high temperature as high as RR℃.

Corrosion resistance

Incoloy800 is a face-centered cubic lattice structure strengthened by austenite solid solution.

Incoloy800 is resistant to corrosion by many corrosive media, and its corrosion resistance is equivalent to that of austenitic stainless steel in a water-based corrosive environment.

The high nickel content makes it resistant to stress corrosion cracking, and the high chromium content makes it better resistant to pitting and crevice corrosion.

Incoloy800 alloy has good corrosion resistance to nitric acid and organic acids, but its corrosion resistance in sulfuric acid and hydrochloric acid is limited.

In addition to the possibility of pitting corrosion in halides, it has good corrosion resistance in oxidizing and non-oxidizing salts. It also has good corrosion resistance in water, steam and mixtures of steam, air and carbon dioxide. It has excellent anti-oxidation, carbonization atmosphere and environmental performance in which oxidation and carbonization alternately occur at high temperatures. The corrosion resistance of hydrogen, nitrogen and sulfur-containing gases is also very good. In the latter application environment, the performance is better in oxidizing conditions than in reducing conditions.

In summary, the alloy has excellent oxidation and corrosion resistance.

Posted by KAYSUNS, the stainless steel pipe fittings supplier

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