Incoloy Alloy 800 / 800H/ 800HT

Technical Data Sheet

Chemical Composition Limits
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.

Alloy 800 - The 800 series of alloy (Incoloy 800, 800H and 800HT) are nickel-iron-chromium superalloys that have excellent properties of high temperature strength and resistance to oxidation, carburization and other types of high temperature corrosion. Alloy 800, 800H and 800HT are used in various applications from furnace components, petrochemical furnace cracker tubes to sheathing for electrical heating elements.

Typical Mechanical Properties

Material	Temp		Hardnes BHN	Tensile Strength MPa		Yield Strength (0.2% Offset)
	°F	°C		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

 

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Availability:
INCOLOY 800 Plate	INCOLOY 800 Fittings	INCOLOY 800 Tube / Pipe
INCOLOY 800 Bar	INCOLOY 800 Sheet	INCOLOY 800 Coil /Strap
INCOLOY 800 Fasteners / Flanges	INCOLOY 800 Powder	INCOLOY 800 Welding Product

Specifications
Alloy 800 - UNS N08800
Alloy 800H - UNS N08810
Alloy 800HT - UNS N08811

Rod	ASTM B 408, ASME SB 408, ISO 9723, BS 3076NA15, DIN 17460, EN 10095
Bar	AMS 5766, ASTM B 408, ASME SB 408, ISO 9723, BS 3076NA15, DIN 17460, EN 10095
Wire	ISO 9724, BS 3075NA15
Forgings	AMS 5766, ASTM B564, ASME SB 564, ASME Code Case 1949, ISO 9725, DIN 17460
Plate	AMS 5871, ASTM A 240/A 480, ASME SA 240/SA 480, ASTM B 409/B 906, ASME SB 409/SB 906, BS 3072NA15, DIN 17460, EN 10028-7, EN 10095
Sheet	AMS 5871, ASTM A 240/A 480, ASME SA 240/SA 480, ASTM B 409/B 906, ASME SB 409/SB 906, BS 3072NA15, DIN 17460, EN 10028-7, EN 10095
Strip	AMS 5871, ASTM A 240/A 480, ASME SA 240/SA 480, ASTM B 409/B 906, ASME SB 409/SB 906, BS 3073NA15, DIN 17460, EN 10028-7, EN 10095
Pipe	ASTM B 407/B 829, ASME SB 407/SB 829 (Seamless Pipe), BS 3074NA15 (Seamless Pipe), DIN 17459
Tube	ASTM B 163, ASME SB 163 (Seamless Condenser & Heat Exchanger Tubes), ASTM B 407/B 829, ASME SB 407/SB 829 (Seamless Tube), ASTM B 515/B 751, ASME SB 515/SB 751 (Welded Tubes), BS 3074NA15 (Seamless Tubes), ISO 6207, DIN 17459
Other	ASTM B 366, ASME SB 366 (Fittings) - ASME Code Cases N201 & N254 (All products for nuclear construction), ISO 4955A (General), NACE MR-01-75, AFNOR Z5 NC 35-20, Werkstoff Nr 1.4876, UNS N08810, N08811
All	ASME Code Case 1325, SEW 470, VdTUV 412 and 434, Incoloy 800®

 

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Introduction

Incoloy 800, 800H, and 800HT are nickel-iron-chromium alloys having high resistance to carburization and oxidation in high-temperature exposure and with good strength. These nickel steel alloys are identical except for the higher level of carbon in alloy 800H, and the addition of up to 1.20 % aluminum and titanium in alloy 800HT.

Incoloy 800 was the first of these alloys and it was slightly modified into Incoloy 800H. The modification made was to control carbon (.05-.10%) and grain size to optimize stress rupture properties. Incoloy 800HT has more modifications to the combined aluminum and titanium 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 actually meant for high-temperature structural applications. These alloys are resistant to embrittlement from precipitation of sigma phase and chloride stress-corrosion cracking due to the nickel content. The corrosion resistance is quite high.

In the solution annealed condition, alloys 800H and 800HT have excellent creep and stress rupture properties. The dual certified 800H/HT alloy is commonly available also with Mega Mex.

Incoloy 800 is mainly 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.

Superior cold forming properties associated with the nickel-chromium alloys are exhibited with 800HT. When cold forms 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.

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Chemical Composition

Alloy 800 (UNS N08800) Chemical Composition, %

The chemical composition of Alloy 800 is:

Ni	Cr	Fe	C	Al	Ti	Al+Ti
30.0-35.0	19.0-23.0	39.5 min	0.10 max	0.15-0.60	0.15-0.60	0.30-1.20

Alloy 800H (UNS N08810) Chemical Composition, %

The chemical composition of alloy 800H is:

Ni	Cr	Fe	C	Al	Ti	Al+Ti
30.0-35.0	19.0-23.0	39.5 min	0.05-0.10	0.15-0.60	0.15-0.60	0.30-1.20

Alloy 800HT (UNS N08811) Chemical Composition, %

The chemical composition of Alloy 800HT is :

Ni	Cr	Fe	C	Al	Ti	Al+Ti
30.0-35.0	19.0-23.0	39.5 min	0.06-0.10	0.25-0.60	0.25-0.60	0.85-1.2

Forms of INCOLOY 800H/800HT

The forms of INCOLOY 800H/800HT are:

• Sheet
• Plate
• Bar
• Pipe & Tube (welded & seamless)
• Fittings (i.e., flanges, slip-ons, blinds, weld-necks, lap joints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)

Properties of INCOLOY 800H/800Ht

The properties of 800H/800Ht are:

• High temperature strength
• Good resistance to many sulfur-containing atmospheres
• High creep rupture strength
• Resistant to carburization and oxidation in high temperature environments
• Good corrosion resistance in many acidic environments.

Mechanical Properties (Typical room temperature Tensile Properties of Annealed Material)

The mechanical properties of INCOLOY 800H/HT are:

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

ASTM Specifications

The ASTM specifications are:

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

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Applications of Incoloy 800H/HT

Alloys 800H/HT is used in a range of applications that involve 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. Petrochemical and chemical 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.

The applications of Incoloy 800H/HT are:

• Hydrocarbon cracking
• Ethylene furnace quench boilers
• Super-heater and re-heaters in power plants
• Heat exchangers
• Pressure vessels
• Valves, fittings and other components exposed to corrosive attack from 1100-1800° F
• Heat-treating equipment
• Industrial furnaces
• Chemical and petrochemical processing.

 

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Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.