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. Today, most suppliers, including Mega Mex, only carry the dual certified 800H/HT alloy.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. The chemical balance allows the nickel steel alloy to exhibit excellent resistance to carburization, oxidation and nitriding atmospheres. Incoloy 800HT will not become embrittled even after long periods of usage in the 1200-1600° F range where many stainless steels become brittle. Excellent cold forming characteristics typically associated with the nickel-chromium alloys are exhibited with 800HT. When cold formed extensively the grain size produces a visibly undulated surface called [orange peel". Incoloy 800HT can be welded by the common techniques used on stainless steels.Yuhong Products ASTM Specifications: AlloyPipe SmlsPipe WeldedTube SmlsTube WeldedSheet/PlateBarForgingFittingAlloy 800 (UNS N08800)B407B154B163B515B409B408B564B366Alloy 800H (UNS N08810)B407B154B163B515B409B408B564B366Alloy 800HT (UNS N08811)B407B154B163B515B409B408B564B366Advantage characteristics of Incoloy 800H/HT:High temperature strengthHigh creep rupture strengthResistant to oxidation and carburization in high temperature environmentsGood corrosion resistance in many acidic environmentsGood resistance to many sulfur-containing atmospheresAlloy 800HT (UNS N08811) Chemical Composition, %NiCrFeCAlTiAl+Ti30.0-35.019.0-23.039.5 min.06-.10.25-.60.25-.600.85-1.2Applications of Incoloy 800H/HT:Ethylene furnace quench boilersHydrocarbon crackingValves, fittings and other components exposed to corrosive attack from 1100-1800° FIndustrial furnacesHeat-treating equipmentChemical and petrochemical processingSuper-heater and re-heaters in power plantsPressure vesselsHeat exchangers Production Process Steps: Seamless Pipe Production Flow Chart: Stainless Steel Bar-> Inspection-> Peeling-> Cut-Center-> Heating-> Piercing-> Inspection/Polishing-> Pickling-Cold Rolling/Drawing-> Pickling-> Solution Annealing-> Straightening-> Cutting-> Bright Annealing/Pickling Passivating-> Composition Inspect-> Marking-> Packing-> Storing-> Shiping.
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