Alloy 800H

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Alloy 800H

information

Equivalent designations
UNS N08810
DIN W. Nr. 1.4958

Form	ASTM
Rod and bar	B 408
Plate, sheet and strip	A 240, A 480, B 409, B 906
Seamless pipe and tube	B 407, B 829
Welded pipe	B 514, B 775
Welded tube	B 515, B 751
Welding fitting	B 366
Forging	B 564

Chemical composition

%	Fe	Ni	Cr	C	Mn	Si	S	Cu	Al	Ti
min	39.5	30.0	19.0	0.05					0.15	0.15
max		35.0	23.0	0.10	1.50	1.00	0.015	0.75	0.60	0.60

Physical properties

Density	7.94 g/cm3
Melting range	1357-1385℃

Features: Incoloy 800H has a restricted carbon content range of 0.05 to 0.10%, which is in the upper portion of that of Incoloy 800, and is annealed at 1149 to 1177℃ (Incoloy 800 is annealed at 983 to 1038℃). These differences impart it to have higher stress rupture and creep properties than Incoloy 800.

Applications: Chemical and petrochemical process piping, high temperature heat exchangers, furnace components, carburizing equipment, heating-element sheathing, and nuclear power steam superheating tubing.

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