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INCOLOY 800HT, UNS N08811, WNR 1.4959, DIN 1.4859

Views: 1     Author: Wang     Publish Time: 2024-10-22      Origin: Site

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Difference of Incoloy 800/800H/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.


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. The chemical balance gives the nickel steel alloys excellent resistance to oxidation, carburizing and nitriding atmospheres. The chemical balance gives these nickel alloys excellent resistance to oxidation in fuel atmospheres and in the presence of nitrites. 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.


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.


Alloy 800HT has excellent corrosion resistance to most chemical corrodents, such as sulfuric acid, nitric acid, and hydrochloric acid. Alloy 800HT is resistant to strong oxidizers at elevated temperatures and is a very good choice for applications such as metering pumps, chemical injection, or dispensing equipment. The alloy 800HT exhibits excellent resistance to salt water, seawater, chlorine, and steam, as well as fresh water and other industrial chemicals. It’s also resistant to pitting and crevice corrosion, meaning it will last for a long time. Alloy 800HT is an alloy with a high chromium content, which keeps oxygen and certain acids from causing corrosion – it has a higher corrosion resistance than many alloys.


Alloy 800HT (UNS N08811) Chemical Composition, %

Ni

Cr

Fe

C

Al

Ti

Al+Ti

30.0-35.0

19.0-23.0

39.5 min

.06-.10

.25-.60

.25-.60

0.85-1.2


Applications of Incoloy 800HT

Incoloy 800HT finds extensive use in high-temperature processing applications, particularly in the chemical, petrochemical, and power generation industries. Some common applications include:

Furnace components: Incoloy 800HT is commonly used in furnace components such as muffles, retorts, and radiant tubes.

Heat exchangers: The alloy exhibits good thermal conductivity and resistance to corrosion, making it an ideal material for use in heat exchangers.

Power generation equipment: Incoloy 800HT is used in power generation equipment such as steam turbines and boilers due to its excellent strength and corrosion resistance.

Chemical processing equipment: The alloy is widely used in chemical processing equipment due to its exceptional resistance to acidic and alkaline solutions.

Industrial piping systems: Incoloy 800HT is an excellent material for high-temperature piping systems, particularly in corrosive environments.

JN Alloy is a distributor and product manufacturer of stainless steel, duplex steel, and nickel.
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