Industrial applications of Incoloy 800H/800HT wire

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Industrial applications of Incoloy 800H/800HT wire

On the base of certain operations the grain size requirements of incoloy 800H/800HT wires vary significantly such as in certain application the concentration of aluminum and titanium in incoloy 800H is restricted to 0.4 – 0.7% for medium processing temperatures of 1000oF to 1400oF or 540oC to 760oC. The mechanical features of incoloy 800/800HT are paired with their resistance to corrosion properties at the elevated temperatures that makes the incoloy alloys very purposeful for using in the different high temperature and long term oriented operations.These alloys are also significantly used in the variety of corrosive media.

In the hydrocarbon treatment operations the incoloy alloys are significantly used in the steam and hydrocarbon filtration for catalyst tubing, convection vessels, pigtails, opening manifolds, and cooling-system piping; in ethylene preparation for both convection and cracking vessels, and pigtails; in oxy-alcohol preparation for tubing in hydrogenation heaters; in hydrodealkylation systems for heater vessels; and in the

preparation of vinyl chloride monomer for cracking tubes, return curves and inlet and outlet flanges.

The incoloy 800H/800HT wires are also widely used in the industrial heating systems. In the different kinds of heating furnaces, these alloys are utilized in the radiant tubes, muffles, retorts, and assorted furnace fixtures. Moreover power production plants use these alloys in the steam superheating tubing and elevated temperature heat exchangers in gas-quenched nuclear reactors.

The chemical composition limits of incoloy 800H and 800HT reside within the limits of INCOLOY alloy 800.

The physical properties of incoloy 800H/800HT wire are given below:

Density g/cm3	7.94
Melting Range	2475-2525oF or 1357-1385oC
Specific Heat	460 J/kg•°C
Permeability at 70°F (21°C),Annealed	1.014
Curie Temperature	-175oF or -115oC

The modulli of elasticity of incoloy 800H/800HT wire are given below:

Temperature oF	Tensile Modulus, 10(3)ksi	Shear Modulus,10(3)ksi	Poisson's Ratio
-310	30.55	11.45	0.334
75	28.50	10.64	0.339
200	27.82	10.37	0.341
400	26.81	9.91	0.353
600	25.71	9.47	0.357

The electric and thermal properties of incoloy 800H/800HT wire are given below:

Temperature oF	Electrical Resistivity ohm•circ mil/ft	Thermal Conductivity Btu•in/ft(2) in/in/°F	Coef. Of Expansion 10(-6) in/in/°F
70	595	80	-
100	600	83	-
200	620	89	7.9
400	657	103	8.8
600	682	115	9.0

The vital difference between incoloy alloy series depends on the difference of their mechanical properties. The difference in the mechanical properties is due to difference in the chemical composition of these allots and the different temperature annealing. Generally the incoloy 800 wire possesses higher mechanical properties at the room temperatures and minimum to high temperature exposures. On the other side the incoloy 800H and 800HT wire offer high creep and stress rupture strength at the higher temperature exposures.

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