INCOLOY 800H/HT

Incoloy 800H Characteristics and Use:

Incoloy 800H/HT is an austenitic heat resistant alloy widely used in high temperature pressure structures. The high strength of 800H/HT is mainly due to the addition of carbon, aluminum and titanium.

1. Excellent corrosion resistance in extremely high temperature waterborne media up to 500°C
2. Good stress corrosion resistance
3. Good processability

Metallographic structure of Incoloy 800H:

800H is a face-centered cubic lattice structure. The extremely low carbon content and increased Ti:C ratio increase the structural stability and maximum resistance to sensitization

and intergranular corrosion. Low temperature annealing at about 950°C ensured the fine grain structure.

Corrosion resistance of Incoloy 800H:

800H can resist corrosion of many corrosive media:

1. The high nickel content makes it have good stress corrosion cracking resistance under water corrosion condition.
2. The high chromium content makes it have better resistance to pitting and crevice corrosion cracking.
3. The alloy has good corrosion resistance of nitric acid and organic acid, but the corrosion resistance of sulfuric acid and hydrochloric acid is limited.
4. Good corrosion resistance in oxidizing and non-oxidizing salts, except for the possibility of pitting in halides.
5. It is also highly resistant to corrosion in water, steam and mixtures of steam, air and carbon dioxide.

Application range:

1. Nitric acid condenser — nitric acid corrosion resistance
2. Steam heating pipe — very good mechanical properties
3. Heating element tube — good mechanical properties

For applications up to 500°C, the alloy supply state is annealed.

Relate Alloy Type: Incoloy 825

Incoloy 800H Physical Performance:

Incoloy 800H Minimum value of mechanical properties of alloys at room temperature: