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It remains ductile during long term use at temperatures below 1290°F (700°C) due to a maximum titanium and aluminum content of 0.7%. Alloy 800 with a standard anneal is recommended for service below 1100°F (600°C). Alloy 800H resists reducing, oxidizing and nitriding atmospheres, as well as, atmospheres that alternate between reducing and oxidizing. The alloy remains stable in long term high temperature service.
Alloy 800H has the following roperties:
1. Excellent corrosion resistance in extremely high temperature aqueous media up to 500°C
2. Good resistance to stress corrosion
3. Good workability
Metallographic structure of Incoloy 800H:
800H is a face-centered cubic lattice structure. Very low carbon content and increased Ti:C ratio increase structural stability and maximum resistance to sensitization and intergranular corrosion. A low-temperature annealing around 950°C ensures a fine-grained structure.
Corrosion resistance of Incoloy 800H:
800H can resist corrosion of many corrosive media. Its high nickel content makes it resistant to stress corrosion cracking in aqueous corrosion conditions. The high chromium content provides better resistance to pitting and crevice corrosion cracking. The alloy has good corrosion resistance to nitric acid and organic acids, but limited corrosion resistance in sulfuric acid and hydrochloric acid. Good corrosion resistance in oxidizing and non-oxidizing salts, in addition to the potential for pitting corrosion in halides. It also has good corrosion resistance in water, steam and mixtures of steam, air and carbon dioxide.
Grade | Ni | Cr | Fe≤ | Al | C | Mn | P≤ | Si≤ | S≤ | Al & Ti | Cu≤ |
Incoloy 800H | 30.0-35.0 | 19.0-23.0 | 39.5 | 0.15-0.60 | 0.05-0.10 | 1.5 | 0.045 | 1.00 | 0.015 | 0.30-1.20 | 0.75 |
Density: 8.0 g/cm3
Melting point: 1350-1400 ℃
Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
Incoloy 800H | 65[450] | 25[170] | 30 |
Incoloy 800H Equivalent Grades
STANDARD | WERKSTOFFNR. | UNS | JIS | BS | GOST | AFNOR | EN | OR |
Incoloy 800H | 1.4958 / 1.4876 | N08810 | NCF 800H | NA 15(H) | ЭИ670 | Z8NC33-21 | X5NiCrAlTi31-20 | XH32T |
Incoloy 800H ASTM Specifications
Product From | Rod and Bar | Plate, Sheet & Strip | Seamless Pipe & Tube | Welded fittings | Forging |
Standard | ASTM B408, EN 10095 | ASTM A240/ A480/B409/ B906 | ASTM B829/ B407 | ASTM B366 | ASTM B564/DIN 17460 |
Incoloy 800H Application：
Chemical and Petrochemical Processing—process equipment for theproduction of ethylene, ethylene dichloride, acetic anhydride, ketene,nitric acid and oxy-alcohol
Petroleum Refining—steam/hydrocarbon reformers andhydrodealkylation units
Power Generation—steam super-heaters and high temperature heatexchangers in gas-cooled nuclear reactors, heat exchangers andpiping systems in coal-fired power plants
Thermal Processing Fixtures—radiant tubes, muffles, retorts andfixtures for heat-treating furnaces
