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Alloy 800 / 800H/800HT(UNS N08800)

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. Application: Chemical and petrochemical process piping, heat exchangers, furnace components, carburizing equipment, heating-element sheathing, and nuclear power steam-generator tubing.


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



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

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 Standard

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

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