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Alloy 800HT

information

Equivalent designations
UNS N08811
DIN W. Nr. 1.4959

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	Al+Ti
min	39.5	30.0	19.0	0.06					0.15	0.15	0.85
max		35.0	23.0	0.10	1.50	1.00	0.015	0.75	0.60	0.60	1.20

Physical properties

Density	7.94 g/cm3
Melting range	1357-1385℃

Features: Incoloy 800HT ensures higher stress rupture and creep properties compared to Incoloy 800H as a result of restricting the carbon content further in the range of 0.06 to 0.10% (Incoloy 800H is 0.05 to 0.10%), and the aluminum plus titanium content at 0.85 to 1.20% (Incoloy 800H is 0.30 to 1.20%).

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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