Incoloy 800HT

Incoloy 800HT

Additional information

UNS Number

N08811

Werkstoff Number

1.4959

Description

Incoloy 800HT is a nickel-iron-chromium alloy with good strength and excellent resistance to oxidation and carburization in high-temperature exposure. Except for the higher level of carbon in alloy 800H, 800 and 800HT alloys are identical and the addition of up to 1.20 percent titanium and aluminum in 800HT alloy. Incoloy 800HT has additional modifications to the combined titanium and aluminum levels (.85-1.20%) to make sure optimum heat properties. 800H/HT alloy combines the properties of both forms and it is dual certified. Incoloy 800HT was meant for high temperature structural applications. The nickel content makes the alloys extremely proof against each chloride stress-corrosion cracking and to embrittlement from precipitation of sigma phase. Incoloy 800HT have superior creep and stress rupture properties. Incoloy 800HT is used where resistance to creep and rupture is required i.e under temperatures above 1100°F. The nickel steel alloy exhibits excellent resistance to carburization, oxidation and nitriding atmospheres due to the chemical balance. Many stainless steels become brittle after long periods of usage in the 1200-1600°F range.Incoloy 800HT won’t become embrittled even when long periods of usage within the 1200-1600°F range where many stainless steels become brittle. Incoloy 800HT shows excellent cold forming characteristics typically associated with the nickel-chromium alloys.

Application

  • Ethylene furnace quench boilers
  • Hydrocarbon cracking
  • Valves, fittings and other components exposed to corrosive attack from 1100-1800° F
  • Industrial furnaces
  • Heat-treating equipment
  • Chemical and petrochemical processing
  • Super-heater and re-heaters in power plants
  • Pressure vessels
  • Heat exchangers

Chemical Component

Chemical Components C Si Mn P S Cr Ni Cu Ti Al Al+Ti Fe
Minimum 0.06 19 30 0.15 0.15 0.85 39.5
Maximum 0.1 1 1.5 0.045 0.015 23 35 0.75 0.60 0.60 1.20

Mechanical Properties

Tensile Strength
σb 
Mpa
Yield Point
σs 
Mpa
Elongation
δ 
%
Hardness 

HBW

≥450 ≥170 long.
≥30
≤192

 

Elastic Modulus Coefficient of Thermal Expansion (CTE) Coefficient of Thermal Conductivity Specific Heat Capacity Resistivity
500°C 600°C 700°C 800°C 900°C 1000°C 500°C 600°C 700°C 800°C 900°C 1000°C 20°C 20°C 20°C
GPa 10-6K-1 W/m.K J/kg.K Ω.mm2/m
160 155 145 140 135 125 17.2 17.5 17.9 18.3 18.6 19 12 460 0.99

Product Form

Product Form Size Range From Size Range To
Sheet & Plate 0.30 mm 25 mm
Round Bar 4 mm 380 mm
Tube 6 mm 260 mm

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