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Incoloy 800/800H/800HT Specification

Incoloy 800 is also known as Alloy 800. Its nickel-iron-chromium composition makes it useful in environments with temperatures up to 1100° F. Incoloy 800/H/HT are used in areas where resistance to corrosion and oxidation is crucial.

Incoloy 800H has the same composition as Alloy 800: a nickel-iron-chromium alloy. با این حال, Incoloy 800H has superior resistance to creep rupture compared to Alloy 800. The increased strength results from a high temperature anneal of carbon, aluminum and titanium added into the composition. The additions serve to increase Incoloy 800 H’s strength and temperature resistance, along with resistance to carbonization and oxidation.

Incoloy 800 HT has the same chemical makeup as Incoloy 800 H but for the differences in carbon, aluminum and titanium quantities. Incoloy 800 H has more carbon, but Incoloy 800 HT is composed of more aluminum and titanium. This gives 800 HT even greater resistance to high temperatures. Incoloy 800 H/HT are recommended for temperatures exceeding 1100° F, often in instances where stainless steels are subject to crack and creep. The Incoloy alloys are commonly used in high temperature environments, such as industrial furnaces, chemical and nuclear vessels, and heat-treating equipment. Both Incoloy 800 H and 800 HT are dually certified.

Incoloy 800/800H/800HT Products Form

  • ورق
  • بشقاب
  • نوار
  • لوله & لوله (welded & seamless)
  • اتصالات
  • Elbows, tees, stub-ends, returns, caps, crosses, reducers, pipe nipples. و غیره.
  • Wire

Applications for Incoloy 800/800H/800HT

  • Heat exchangers and process piping
  • Chemical processing
  • Carburizing fixtures and retorts
  • Oil and gas industries
  • Nuclear and power industries
  • Commercial Gas Turbines
  • Furnace components
  • Food Processing
  • Electric range heating-element sheathing
  • Chemical Processing
  • Cryogenic Storage Tanks
  • Ammonia effluent coolers
  • Power generation industries
  • Nuclear reactors
  • Gas turbines engines
  • Pressure vessels

Equivalents of Incoloy 800/800H/800HT

StandardIncoloy 800Incoloy 800HIncoloy 800HT
ماN08800N08810N08811
WERKSTOFF NR.1.48761.4958 / 1.48761.4859 / 1.4876
درX10NiCrAlTi32-20X5NiCrAlTi31-20X8NiCrAlTi32-21
جبههNA 15NA 15(اچ)NA 15(HT)
ORXH32TXH32TXH32T
GOSTЭИ670ЭИ670ЭИ670
اوNCF 800NCF 800HNCF 800HT
در حال غربالZ8NC32-21Z8NC33-21

Chemical Composition – Incoloy 800 / 800اچ / 800HT

ELEMENTINCOLOY 800INCOLOY 800HINCOLOY 800HT
NI30.0 35.030.0 35.030.0 35.0
CR19.0 23.019.0 23.019.0 23.0
FE39.5 حداقل39.5 حداقل39.5 حداقل
MN1.5 حداکثر1.5 حداکثر1.5 حداکثر
جف0.10 حداکثر0.05 0.100.06 0.10
CU0.75 حداکثر0.75 حداکثر0.75 حداکثر
SI1.0 حداکثر1.0 حداکثر1.0 حداکثر
اس0.015 حداکثر0.015 حداکثر0.015 حداکثر
AL0.15 0.600.15 0.600.15 0.60
TI0.15 0.600.15 0.600.15 0.60

* UNS N08811 : Al + Ti = 0.85 1.20

Specified Minimum Mechanical Properties

ASTM B407 – Seamless Pipe & لوله

 قدرت عملکرداستحکام کششیکشیدگی
MPAMPA%
Incoloy 800, 800اچ, 800HTHot Finished, Annealed17045030
Incoloy 800Cold Worked, Annealed20552030

Physical Properties

تراکم0.287 lb/in3 / 7.94 g/cm3
نقطه ذوب2475 2525 °F/ 1357 1385 درجه سانتیگراد
Specific Heat @ 70°F0.11 BTU/lb-°F (32 – 212°F)
460 J/kg-°K (0 –100°C)
Thermal Conductivity @ 212°F10.6 BTU/hr/ft2/ft/°F
18.3 W/m-°K
Elastic Modulus28.5 x 106 psi
196.5 معدل
مقاومت الکتریکی59.5 Microhm-in at 68°F
99 Microhm-cm at 20°C
Annealing983 1038 درجه سانتیگراد / 1800 1900 °F
QuenchRapid Air
Permeability @ 70°F Annealed1.014 (200 Oersted)
Curie Temperature-115 °C/ -175 °F

مقاومت در برابر خوردگی

Incoloy 800/800H/800HT is generally free from both chloride stress corrosion cracking and intergranular corrosion caused by sensitisation. The alloy can be used in sea water. Incoloy 800/800H/800HT has resistance to acids similar to austenitic stainless steels. It has excellent resistance to both oxidising and non oxidising salts, except for halide salts, where pitting may occur. Please consult Austral Wright Metals for advice on your specific application.

عملیات حرارتی

The grade has high rate of work hardening. Hence, after cold working to remove brittleness, the grade needs to annealed. Annealing is done by heating the grade about 980°C for about 15 minutes, and then air cooling.

Hot working

INCOLOY alloy 800 can be hot worked at temperature ranges of 871-1232°C (1600-2250°F).

Cold working

Cold working may be done on the alloy using standard tooling.

قابلیت تغییر

Incoloy 800/800H/800HT are “C” class alloys, difficult to machine. Heavy machines, sharps, slow speeds and deep cuts to remove the work hardened layer are needed.

Welding

The grade can be readily welded by common welding techniques like gas tungsten arc welding, shielded metal arc welding, metal inert gas welding, و غیره. Post-weld annealing might not be required. The grade can be appropriately brushed for impurities and heat tint is removed after welding.

Fabrication

Incoloy 800/800H/800HT can be readily hot worked. Forging is finished above 870°C, and air cooled. The work is then solution annealed. The alloys can be cold formed similarly to stainless steel but deformation forces are higher.

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