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.

 

Provide all grade of these alloy by different shape & size is Our expertise

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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.