Description

Send Inquiry

Incoloy Alloy 800/800H/800HT

Incoloy® Alloy 800, 800H, and 800HT are a family of nickel-iron-chromium superalloys renowned for their exceptional strength and resistance to oxidation and carburization at high temperatures. The key distinctions lie in their controlled chemistry and mechanical properties: Alloy 800 is a versatile standard grade, while Alloy 800H (UNS N08810) and Alloy 800HT (UNS N08811) are optimized for enhanced creep rupture strength, with 800HT requiring a tighter aluminum and titanium control for superior stability. These alloys typically conform to specifications such as ASTM B409, ASME SB-409, and ASTM B564, making them the preferred material for critical applications in furnace components, heat exchangers, and piping systems in the petrochemical and power generation industries where temperatures can exceed 1000°F (540°C).

Professional team

7x24 hours

Products Description

For high-temperature environments demanding superior corrosion resistance and mechanical integrity, Incoloy Alloy 800/800H/800HT offers a proven solution. This nickel-iron-chromium alloy series is engineered to perform under intense thermal stress, with Alloy 800H and 800HT specifically designed for maximum creep and rupture strength above 1500°F. Commonly supplied to ASTM B409 for plate and ASTM B564 for forgings, these grades are essential in constructing industrial heating furnaces, radiant tubes, and thermowells. Their excellent resistance to oxidation and carburization, ensured by a stable austenitic structure, ensures long service life and reliability in the most demanding heat treatment and chemical processing equipment.

chemical composition

Weight %	Ni	Cr	Fe	C	Al	Ti	Al+Ti
Alloy 800	30-35	19-23	39.5 min	0.10 max	0.15-0.60	0.15-0.60	0.30-1.20
Alloy 800H	30-35	19-23	39.5	0.05-0.10	0.15-0.60	0.15-0.60	0.30-1.20
Alloy 800HT	30-35	19-23	39.5	0.06-0.10	0.25-0.60	0.25-0.60	0.85-1.20
ASTM Grain Size - Alloy 800 is not specified, Alloy 800H is 5 or coarser, Alloy 800HT is 5 or coarser.

Mechanical Properties

Material	Temp.		Hardness	Tensile Strength		Yield Strength (0.2% Offset)
Material	°F	°C	BHN	ksi	MPa	KSI	MPa
Alloy 800H and Alloy 800HT	80	27	126	77.8	536	21.7	150
Alloy 800H and Alloy 800HT	800	425		67.5	465	18.8	130
Alloy 800H and Alloy 800HT	1000	540	90	62.7	432	13.0	90
Alloy 800H and Alloy 800HT	1200	650	84	54.8	378	13.5	93
Alloy 800H and Alloy 800HT	1300	705	82	47.7	329	15.8	109
Alloy 800H and Alloy 800HT	1400	760	74	34.2	236	13.1	90
Alloy 800HT is a Trademark of Special Metals Corporation

Available Products and Specifications

INCOLOY alloys 800H and 800HT are designated as UNS N08810 and UNS N08811 and Werkstoff Numbers 1.4876, 1.4958 and 1.4959. INCOLOY alloys 800H and 800HT are available in all standard mill forms including rod, bar, plate, sheet, strip, shapes, and tubular products.

Rod, Bar, Wire, Forgings, and Forging Stock - ASTM B408 & ASME SB408 (Rod & Bar), ASTM B564 & ASME SB564 (Forgings), ASME Code Case 1325 (All Product Forms), ASME Code Case 1949 (Forgings), ISO 9723 (Rod & Bar), ISO 9724 (Wire), ISO 9725 (Forgings), BS 3076NA15 (Rod & Bar), BS 3075NA15 (Wire), SEW 470 (All Products), VdTÜV 412 & 434 (All Products), DIN 17460 (Rod, Bar, & Forgings), EN 10095 (Rod & Bar)

Plate, Sheet, and Strip - ASTM A240/A480 & ASME SA240/SA480 (Plate, Sheet, and Strip), ASTM B409/B906 & ASME SB409/SB906 (Plate, Sheet, and Strip), ASME Code Case 1325 (All Product Forms), ASME Code Case 2339 (INCOLOY alloy 800H Plate), BS 3072NA15 (Plate & Sheet), BS 3073NA15 (Strip), SEW 470 (All Products), VdTÜV 412 & 434 (All Products), DIN 17460 (Plate, Sheet, & Strip), EN 10028-7 & EN 10095 (Plate, Sheet, & Strip)

Pipe and Tubes - ASTM B163 & ASME SB163 (Seamless Condenser & Heat Exchanger Tubes), ASTM B407/B829 & ASME SB407/SB829 (Seamless Pipe & Tubes), ASTM B514/B775 & ASME SB514/SB775 (Welded Pipe), ASTM B515/B751 & ASME SB515/SB751(Welded Tubes), ASME Code Case 1325 (All Product Forms) and 1983 (Seamless Pipe & Tubes), BS 3074NA15 (Seamless Pipe & Tubes), SEW 470 (All Products), VdTÜV 412 & 434 (All Products), ISO 6207 (Seamless Tubes), DIN 17459 (Seamless Pipe & Tubing)

Other Product Forms - ASTM B366 & ASME SB366 (Fittings), ASME Code Cases N-201 & N-254 (All Products for Nuclear Construction), ISO 4955A (General)

Incoloy 800 / H/ HT ASTM Standard

Alloy	Seamless Tubing	Welded Tubing	Seamless Pipes	Welded Pipes	Bars	Sheet/Plates	Forging Products	B/W Pipe Fittings
Alloy 800 (UNS N08800 / 1.4876)	B163	B515	B407	B154	B408	B409	B564	B366
Alloy 800H (UNS N08810 / 1.4876)	B163	B515	B407	B154	B408	B409	B564	B366
Alloy 800HT (UNS N08811/ 1.4958)	B163	B515	B407	B154	B408	B409	B564	B366

Specification of Incoloy Alloy 800 / H/ HT

Common Trade Name of Alloy 800	Incoloy 800 Nickel 800 Ferrochronin 800 Nickelvac 800 Nicrofer 3220
Common Trade Name of Alloy 800H	Nickelvac 800H Incoloy 800H Nickel 800H Ferrochronin 800H Nicrofer 3220
Common Trade Name of Alloy 800HT	Nickelvac 800HT Incoloy 800HT Nickel 800HT Ferrochronin 800HT
Common Trade Name of Alloy 800AT	Nickel 800AT Nickelvac 800AT Incoloy 800AT Ferrochronin 800AT

Incoloy Alloy 800 / H/ HT Temperature Range

Incoloy Alloy 800	up to about 1500 Deg F (816°C)
Incoloy Alloy 800H	1100 Deg F (593°C) to 1800°F (982°C)

Incoloy 800 / H/ HT Applications & Uses

Heat exchangers and process piping

Chemical processing

Carburizing fixtures and retorts

Oil and gas industries

Nuclear and power industries

Commercial Gas Turbines

Furnace components

Food Processing

Electric range heating-element sheathing

Chemical Processing

Cryogenic Storage Tanks

Ammonia effluent coolers

Power generation industries

Nuclear reactors

Gas turbines engines

Pressure vessels

Incoloy Alloy 800 / H/ HT Composition (% by Weight)

Alloy	UNS N08800	UNS N08811	UNS N08810
Grade	800	800HT	800H
Carbon	0.10 maximum	0.06 - 0.10	0.05 - 0.10
Nickel (NI)	30 - 35	same	same
Chromium	19 - 23	same	same
Iron	39.5 minimum	39.5 minimum	39.5 minimum
Aluminum	.15 - .60	.25 - .60	.15 - .60
Titanium	.15 -.60	.25 - .60	.15 - .60
Aluminium plus Titanium	.30 - 1.20	.85 - 1.20	.30 - 1.20
ASTM Grain Size	NA	5 / Coaser	5 / Coarser

Properties of Incoloy 800 / H/ HT

Product	.2% Yield (ksi)	Tensile (ksi)	Elongation (%)
Rod & Bar	30-60	75-100	60-30

mechanical characteristics

Nickel Grade	Condition	Available shapes	Ultimate Tensile Strength, ksi (MPa)	Yield Strength at 0.2% offset, ksi (MPa)	Elongation in 2" or 4D, percent
800	Annealed	Sheet, Plate	85 (586)	40 (276)	43
800	Annealed	Sheet, Plate Strip, Bar	75 (520)*	30 (205)*	30*
800H	SHT	Sheet, Plate	80 (552)	35 (241)	47
800H	SHT	Sheet, Plate Strip, Bar	65 (450)*	25 (170)*	30*