Incoloy 800H、UNS N08810

Incoloy 800H overview

Incoloy 800H is an austenitic heat-resistant alloy widely used in high-temperature pressure-resistant structural parts. Incoloy 800H is resistant to many corrosive media. Its higher nickel content makes it resistant to stress corrosion cracking in aqueous corrosion conditions. The high chromium content makes it better resistant to pitting and crevice corrosion cracking. The alloy has good resistance to the corrosion of nitric acid and organic acids, but has limited corrosion resistance in sulfuric acid and hydrochloric acid. 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.

 

Incoloy 800H Chemical Composition%

%	Cr	Ni	Mn	Si	Al	Ti	C	Cu	P	S
Min.	19.0	30.0			0.15	0.15	0.05
Max.	23.0	35.0	1.5	1.0	0.60	0.60	0.10	0.75	0.03	0.015

 

Incoloy 800H Density: 0.287 lb / in3

Incoloy 800H Melting point range: 2475- 2525 ° F

 

Physical properties of Incoloy 800H:

Density	8.0 g/cm3
Melting point	1350-1400 ℃

 

Incoloy 800H Minimum value of mechanical properties of alloy at normal temperature:

tensile strength Rm N/mm2	yield strength RP0.2N/mm2	Elongation A5 %
450	180	35

 

Incoloy 800H alloy has the following characteristics:

1.Excellent corrosion resistance in extremely high temperature aqueous media up to 500 ℃

2.Good resistance to stress corrosion

3.Good processability

 

Metallographic structure of Incoloy 800H:

800H is a face-centered cubic lattice structure. Extremely low carbon content and increased Ti: C ratio increase structural stability and maximum resistance to sensitization and resistance to intergranular corrosion. The low-temperature annealing at about 950 ° C ensures a fine-grained structure.

 

Incoloy 800H Applications

1. Nitric acid condenser-resistant to nitric acid corrosion

2. Steam heating tube-very good mechanical properties

3. Heating element tube-very good mechanical properties

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

Special alloy materials commonly used in the food industry:

Stainless steel: 316LN, 317L, 317LMN, 254SMO, 904L, etc.

Nickel-based alloys: Incoloy800HT, Incoloy825, Nickel 201, N6, Nickel 200, etc.

Corrosion resistant alloy: NS112