Incoloy® 800HT

Available in any of the 'profile options'

This Nickel-Chromium-Iron alloy has the same basic composition as Incoloy 800, but has significantly higher creep rupture strength, resultant from the close control of the carbon, aluminium and titanium contents. It has good strength and excellent resistance to oxidation and carburisation in high temperature atmospheres. It also resists corrosion in many aqueous environments.

Incoloy® 800HT is also known as Nicrofer 3220 HP.

Chemical Composition

Specifications

Designations

Key Features

Typical Applications

Element	Min %	Max %
Ni	30.00	35.00
Co	–	2.00
Cu	–	0.75
Cr	19.00	23.00
Al	0.15	0.60
C	0.05	0.10
Si	–	1.00
Mn	–	1.50
Ti	0.15	0.60
Fe	bal
S	–	0.015

BS 3076 NA 15H

W.Nr 1.4958
W.Nr 1.4959
UNS N08811
AWS 021

Higher creep rupture strength than Incoloy 800 due to close control of C, Al, Ti
Excellent resistance to oxidation and carburisation at high temperatures
Corrosion resistant in many aqueous environments
High temperature static applications**

Chemical Processing
Petrochemical Processing
Industrial Furnaces
Heat Treating Equipment

Density	7.94 g/cm³	0.287 lb/in³
Melting Point	1385°C	2525°F
Coefficient of Expansion	14.4 μm/m °C (20 – 100°C)	7.9 x 10^-6 in/in °F (70 – 212°F)
Modulus of Rigidity	78.9 kN/mm²	11444 ksi
Modulus of Elasticity	196.5 kN/mm²	28500 ksi

Heat Treatment of Finished Parts
Condition as supplied by Alloy Wire	Type	Temperature		Time (Hr)	Cooling
Condition as supplied by Alloy Wire	Type	°C	°F	Time (Hr)	Cooling
Annealed or Spring Temper	Stress Relieve	450 – 470	840 – 880	0.5 – 1	Air

Properties
Condition	Approx. tensile strength		Approx. operating temperature depending on load** and environment
Condition	N/mm²	ksi	°C	°F
Annealed	600 – 800	87 – 116	-200 to +1000	-330 to +1830
Spring Temper	800 – 1100	116 – 159	-200 to +1000	-330 to +1830