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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.
Standard Inventory Specifications
ASTM B 409, ASTM B 408, ASTM B 407, ASTM B 564
UNS N08810, UNS N08811
Alloy 800 (UNS N08800) Chemical Composition, %
Ni
Cr
Fe
C
Al
Ti
Al+Ti
30.0-35.0
19.0-23.0
39.5 min
.10 max
.15-.60
.15-.60
.30-1.20
Alloy 800H (UNS N08810) Chemical Composition, %
Ni
Cr
Fe
C
Al
Ti
Al+Ti
30.0-35.0
19.0-23.0
39.5 min
.05-.10
.15-.60
.15-.60
.30-1.20
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
* 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° 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.
Incoloy 800, 800H, and 800HT Specifications
Alloy
Pipe Smls
Pipe Welded
Tube Smls
Tube Welded
Sheet / Plate
Bar
Forging
Fitting
Alloy 800 (UNS N08800)
B407
B154
B163
B515
B409
B408
B564
B366
Alloy 800H (UNS N08810)
B407
B154
B163
B515
B409
B408
B564
B366
Alloy 800HT (UNS N08811)
B407
B154
B163
B515
B409
B408
B564
B366
Incoloy 800, 800H, and 800HT Mechanical Properties
Typical room temperature Tensile Properties of Annealed Material
Product
Tensile (ksi)
.2% Yield (ksi)
Elongation (%)
Rod & Bar
75-100
30-60
60-30
In what forms is Incoloy® 800H/HT available at DZ ?
Resistant to oxidation and carburization in high temperature environments
Good corrosion resistance in many acidic environments
Good resistance to many sulfur-containing atmospheres
Q: Are you trading company or manufacturer ? A: We are manufacturer.
Q: Do you provide samples ? is it free or extra ? A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: What is your terms of payment ? A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
Q: How long is your delivery time? A: Generally it is 7-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Dezhao Industrial Development Co. LTD is functioning as a trustworthy exporter and Supplier of steel and Alloys. Our wide range of products comprises of Stainless Steel, Carbon Steel , Alloy Steel , Monel , Inconel , Hastelloy , Cupro-Nickel and Duplex Steel. We are counted among the foremost repute... Dezhao Industrial Development Co. LTD is functioning as a trustworthy exporter and Supplier of steel and Alloys. Our wide range of products comprises of Stainless Steel, Carbon Steel , Alloy Steel , Monel , Inconel , Hastelloy , Cupro-Nickel and Duplex Steel. We are counted among the foremost repute...
