ASME SB 163 / ASTM B 407 / ASME SB 829 Incoloy 800H / 800HT / 800AT Nickel Alloy

Product Specification

ASME SB 163 / ASTM B 407 / ASME SB 829 Incoloy 800H / 800HT / 800AT Nickel Alloy Pipe

Incoloy Alloy 800H/800HT/800AT

 Incoloy 800, Alloy 800, Ferrochronin 800, Nickelvac 800, Nicrofer 3220.

Common Trade Names: Incoloy 800H/800HT/800AT, Alloy 800H/800HT/800AT, Ferrochronin 800H/800HT/800AT, Nickelvac 800H/800HT/800AT, Nicrofer 3220.

INCOLOY alloy 800H/800HT/800AT is designated as UNS N08810, UNS N08811 and Werkstoff Number 1.4876, 1.4958, 1.4959. It is 

listed in NACE MR0175 for oil and gas service. 

Nickel-iron-chromium alloys having the same basic composition as INCOLOY alloy 800 

but with significantly higher creep-rupture strength. The higher strength results from close control of the carbon, aluminum, 

and titanium contents in conjunction with a high-temperature anneal. Used in chemical and petrochemical 

processing, in power plants for super-heater and reheater tubing, in industrial furnaces, and for heattreating equipment. 

Specifications

INCOLOY alloy 800H/800HT/800AT is designated as UNS N08810, UNS N08811 and Werkstoff Number 1.4876, 1.4958, 1.4959. It is 

listed in NACE MR0175 for oil and gas service. 

Rod, Bar, Wire, Forgings, and Forging Stock: ASTM B 408, ASME SB 408 (Rod & Bar), ASTM B 564, 

ASME SB 564 (Forgings), ASME Code Case 1325 (All Product Forms), ASME Code Case 1949 (Forgings),

 AMS 5766 (Rod & Bar), ISO 9723 (Rod & Bar), ISO 9724 (Wire), ISO 9725 (Forgings), BS 3076NA15 (

Rod & Bar), BS 3075NA15 (Wire), VdTÜV 412 (All Products).

Plate, Sheet, and Strip: ASTM A 240, ASTM A 480, ASME SA 240, ASME SA 480 (Plate, Sheet, and Strip),

 ASTM B 409, ASTM B 906, ASME SB 409, ASME SB 906 (Plate, Sheet, and Strip), ASME Code Case 

1325 (All Product Forms), ASME Code Case 2339 (Plate), AMS 5871 (Plate, Sheet, and Strip), BS 

3072NA15 (Plate & Sheet), BS 3073NA15 (Strip), VdTÜV 412 (All Products), ISO 6208 (plate, sheet and 

strip).

Pipe and Tubes: ASTM B 163 & ASME SB 163 (Seamless Condenser & Heat Exchanger Tubes), ASTM B 

407, ASTM B 829, ASME SB 407, ASME SB 829 (Seamless Pipe & Tubes), ASTM B 514, ASTM B 775, 

ASME SB 514, ASME SB 775 (Welded Pipe), ASTM B 515, ASTM B 751, ASME SB 515, ASME SB 751

(Welded Tubes), ASME Code Case 1325 (All Product Forms), ASME N-20 (Cold Worked Seamless 

Condenser and Heat Exchanger Tubes for Nuclear Service), BS 3074NA15 (Seamless Pipe & Tubes), 

VdTÜV 412 (All Products), ISO 6207 (Seamless Tubing).

Other Product Forms:  ASTM B 366 & ASME SB 366 (Fittings)

Chemical Composition:

Incoloy alloy 800 is a widely used material of construction for equipment that must have high strength and resist carburization,oxidation and other harmful effects of high-temperature exposure. (For high temperature applications requiring optimum rupture and creep properties, Incoloy alloys 800H and 800HT are used). The chromium in the alloy imparts resistance to oxidation and corrosion. The high percentage of nickel maintains an austenitic structure so that the alloy is ductile. the nickel content also contributes general corrosion, resistance to scaling and stress-corrosion cracking. 
Incoloy alloy 800 is used in a variety of applications involving exposure to high temperatures and corrosive environments. It is used for heat-treating equipment such as baskets, trays and fixtures. In chemical and petrochemical processing the alloy is used for heat exchangers and other piping systems in nitric acid media especially where resistance to chloride stress-corrosion cracking is required. In nuclear power plants, it is used for steam-generator tubing. The alloy is often used in home appliances for sheathing of electric heating elements. In the production of paper pulp, digester liquid heaters are often made of alloy 800. In petroleum processing , the alloy is used for heat exchangers that air-cool the process stream.
Incoloy 800 is a nickel-chromium alloy with good strength and excellent resistance to oxidation and carburization. The alloy maintains stable structure during exposure to high temperature, therefore incoloy 800 has good  corrosion resistance  to many acidic environments.

Alloy 800 (UNS N08800), Alloy 800H (UNS N08810) and Alloy 800AT (UNS N08811) are nickeliron-chromium alloys designed to resist oxidation and carburization at elevated temperatures through 1900 °F. The nickel content, 32 %, makes the alloys highly resistant both to 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 800AT have superior creep and stress rupture properties. All three versions of the basic Alloy 800 have been approved as materials of construction under ASME Boiler and Pressure Valve Code, Section I-Power Boilers, Section III-Nuclear Vessels, and Section VIII-Unfired Pressure Vessels. Alloys 800, Alloy 800H and Alloy 800AT are identical except for the higher level of carbon (0.05 to 0.1 %) in Alloy 800H, and the addition of up to 1 % aluminum + titanium in Alloy 800AT. The Alloy 800 is normally used in this service at temperatures to approximately 1100 °F (593 °C). Alloy 800H and Alloy 800AT are normally used above approximately 1100 °F (593 °C) where resistance to creep and rupture is required.

Application:

1>.Industrial Heating Industry radiant tubes, return bends, muffles, retorts and furnace fixtures. 
2>.Petrochemical furnace cracker tubes //// Hydrocarbon Processing Industry catalyst tubing, convection tubing, outlet manifolds and quenching system piping.

3>.Power Generation Industry steam superheating tubing, high temperature heat exchangers.