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              You are here: Home » Products » Series » Incoloy » Incoloy 800HT
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              Incoloy 800HT

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              • INCOLOY 800HT
              • RONSCO
              • Alloy1996INCOY800HT

              INCOLOY 800HT 
              ASTM B 409, B 408, B 407, B 564
              UNS Number N08811
              Other common names: Alloy 800, Alloy 800H, Inconel 800, Alloy 800HT

              Incoloy 800, 800H, and 800HT are nickel-iron-chromium alloys with good strength and excellent resistance to oxidation and carburization in high-temperature exposure. These nickel steel alloys are identical except for the higher level of carbon in alloy 800H, and the addition of up to 1.20 percent aluminum and titanium in alloy 800HT. Incoloy 800 was the first of these alloys and it was slightly modified into Incoloy 800H. This modification was to control carbon (.05-.10%) and grain size to optimize stress rupture properties. Incoloy 800HT has further modifications to the combined titanium and aluminum levels (.85-1.20%) to ensure optimum high temperature properties.The nickel alloy is dual certified (800H/HT) and combines the properties of both forms. Incoloy 800H/HT alloy was intended for high temperature structural applications. The nickel content makes the alloys highly resistant to both chloride stress-corrosion cracking and to embrittlement from precipitation of sigma phase. The general corrosion resistance is excellent. In the solution annealed condition, alloys 800H and 800HT have superior creep and stress rupture properties.

              In what forms is Incoloy 800H/HT?

              Sheet

              Plate

              Bar

              Pipe & Tube (welded & seamless)

              Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)

              What are the characteristics of Incoloy 800H/HT?

              High temperature strength

              High creep rupture strength

              Resistant to oxidation and carburization in high temperature environments

              Good corrosion resistance in many acidic environments

              Good resistance to many sulfur-containing atmospheres

              Alloy 800 (UNS N08800) Chemical Composition( %)

              NiCrFeCAlTiAl+Ti
              30.0-35.019.0-23.039.5 min.10 max.15-.60.15-.60.30-1.20

              Alloy 800H (UNS N08810) Chemical Composition(%)

              NiCrFeCAlTiAl+Ti
              30.0-35.019.0-23.039.5 min.05-.10.15-.60.15-.60.30-1.20

              Alloy 800HT (UNS N08811) Chemical Composition( %)

              NiCrFeCAlTiAl+Ti
              30.0-35.019.0-23.039.5 min.06-.10.25-.60.25-.600.85-1.2

              *Note that the chemical composition of Incoloy 800HT will always be within the limits of Incoloy 800H.
              *Note the limits of Incoloy 800H may or may not be within the limits of Incoloy 800HT.

              In what applications is Incoloy 800H/HT used?
              Ethylene furnace quench boilers
              Hydrocarbon cracking
              Valves, fittings and other components exposed to corrosive attack from 1100-1800&deg; F
              Industrial furnaces
              Heat-treating equipment
              Chemical and petrochemical processing
              Super-heater and re-heaters in power plants
              Pressure vessels
              Heat exchangers

              Alloys 800H/HT 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 Incoloy 800H/HT. 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.


              ASTM Specifications

              AlloyPipe SmlsPipe WeldedTube SmlsTube WeldedSheet/PlateBarForgingFitting
              Alloy 800 (UNS N08800)B407B154B163B515B409B408B564B366
              Alloy 800H (UNS N08810)B407B154B163B515B409B408B564B366
              Alloy 800HT (UNS N08811)B407B154B163B515B409B408B564B366


              Mechanical Properties
              Typical room temperature Tensile Properties of Annealed Material

              ProductTensile (ksi).2% Yield (ksi)Elongation (%)
              Rod & Bar75-10030-6060-30


              PH Stainless Steel
              17-4PH
              17-7PH
              15-5PH
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              / 0731-82250427
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