Q1: What is the relationship between UNS N08811, Incoloy 800HT, 800H and 800 alloy sheet?
A1: UNS N08811 is the material code for Incoloy 800HT, which is a high-temperature upgraded version of Incoloy 800H and Incoloy 800. All three belong to the 800-series nickel‑iron‑chromium alloys covered under ASTM B409 standard for plate and sheet. 800HT has stricter control of aluminum, titanium and carbon for superior creep strength at extreme temperatures.
Q2: What are the main factors that affect the price of Incoloy 800/800H/800HT plate/sheet?
A2: Price is mainly determined by:
International nickel and raw material market prices
Sheet thickness, width, length and order quantity
Production process (hot rolled / cold rolled)
Surface condition (black, pickled, polished, bright annealed)
Testing requirements (UT, PMI, mechanical test, heat code traceability)
Origin and brand (mill direct price vs trader price)
Q3: Why is Incoloy 800HT (N08811) usually more expensive than 800H and 800?
A3: Incoloy 800HT requires more precise chemical composition control, higher-temperature rolling, and stricter grain size management to achieve excellent creep resistance. Its production cost is higher, and it is mainly used in ultra-high-temperature industrial environments, so its market price is normally higher than 800H and ordinary 800 alloy.
Q4: In what forms are Incoloy 800 series plates/sheets usually supplied and priced?
A4: They are generally supplied as hot-rolled plate, cold-rolled sheet, cut-to-size panels, and full coils. Pricing is usually based on USD per kilogram or USD per metric ton, with extra costs for cutting, edge trimming, surface finishing, and third-party inspection.
Q5: What applications justify the higher price of Incoloy 800HT / 800H sheet?
A5: These alloys are used in high-temperature industrial environments such as petrochemical cracking furnaces, boiler superheaters, industrial heating elements, flue gas incineration systems, carburizing furnaces, and heat treatment fixtures. Their excellent oxidation resistance, creep strength and long service life make the higher price cost-effective in harsh working conditions.
