High Strength Alloys 800H are used in a variety of applications involving exposure to corrosive environments and high temperatures such as heat treating equipment, chemical and petrochemical processing, nuclear power plants and the paper pulp industry. Heat-treating equipment such as baskets, trays, and fixtures employ high temperature resistance Incoloy 800H. Chemical and petrochemical processing industries use the alloys for heat exchangers and other piping systems in nitric acid media especially where resistance to chloride stress-corrosion cracking is required. Power plants use them for super-heater and re-heater tubing.
Incoloy 800 is primarily used in applications with temperatures up to 1100° F, where alloys 800H and 800HT are normally used in temperatures above 1100° F where resistance to creep and rupture is required.
Typical applications for corrosion resistance alloy 800H is- Heat exchangers and process piping; carburizing fixtures and retorts; furnace components; electric range heating-element sheathing; extruded tubing for ethylene and steam methane reforming furnaces; ammonia effluent coolers.
Alloy 800H (UNS N08800) Chemical Composition, %
Element |
Min |
Max |
Nickel + Cobalt |
30.0 |
35.0 |
Cobalt |
--- |
2.00 |
Chromium |
19.0 |
23.0 |
Copper |
--- |
0.75 |
Iron |
Bal |
|
Silicon |
--- |
1.00 |
Manganese |
--- |
1.50 |
Carbon |
0.05 |
0.10 |
Aluminum |
0.15 |
0.60 |
Titanium |
0.15 |
0.60 |
Sulfur |
--- |
0.015 |
Mechanical Properties of Incoloy 800H
Alloy |
Form |
Condition |
Ultimate Tensile Strength, ksi (MPa) |
Yield Strength |
Elongation in 2" or 4D, percent |
800H |
Sheet, Plate |
SHT |
80 (552) |
35 (241) |
47 |
800H |
Sheet, Plate |
SHT |
65 (450)* |
25 (170)* |
30* |
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