Hastelloy X Sheet Plate Strip

Hastelloy X Sheet (Plate Strip) is a nickel-chromium-iron-molybdenum superalloy with outstanding high temperature strength, oxidation resistance, and fabricability. Its oxidation resistance is excellent up to 2200° F. Hastelloy X Sheet (Plate Strip) has also been found to be exceptionally resistant to stress-corrosion cracking in petrochemical applications. Matrix stiffening provided by the molybdenum content results in high strength in a solid-solution alloy having good fabrication characteristics. Although Hastelloy X Sheet is primarily noted for heat and oxidation resistance Hastelloy X Sheet (Plate Strip) also has good resistance to chloride stress-corrosion cracking, carburization, and excellent resistance to reducing or carburizing atmospheres.

Characteristics of Hastelloy X Sheet (Plate Strip)

Hastelloy X Sheet (Plate Strip) is one of the most widely used nickel base superalloys for gas turbine engine combustion zone components such as transition ducts, combustor cans, spray bars and flame holders as well as in afterburners, tailpipes and cabin heaters. It is recommended for use in industrial furnace applications because it has unusual resistance to oxidizing, reducing and neutral atmospheres. Hastelloy X is also used in the chemical process industry for retorts, muffles, catalysts support grids, furnace baffles, tubing for pyrolysis operations and flash drier components.

Hastelloy X Sheet has excellent forming and welding characteristics. It can be forged and, because of its good ductility, can be cold worked. It can be welded by both manual and automatic methods including shielded metal arc, gas tungsten arc, gas metal arc and submerged arc processes. The alloy can also be resistance welded. For hot forming, the alloy should be heated to a starting temperature of 2150° F (1175°C).

Chemical Composition of Hastelloy X

Element	Min	Max
Molybdenum	8.00	10.0
Chromium	20.5	23.0
Iron	17.0	20.0
Tungsten	0.20	1.00
Cobalt	0.50	2.50
Carbon	0.05	0.015
Silicon	--	1.00
Manganese	--	1.00
Boron	--	0.01
Phosphorus	--	0.04
Sulfur	--	0.03
Nickel	Remainder

Physical Properties of Hastelloy X

Physical Properties	°F	British Units	°C	Metric Units
Density	72	0.297 lb./cubic in.	22	8.22 g/cubic cm.
Melting Range	2300- 2470	1260- 1355
Electrical Resistivity	72	46.6 microhm-in.	22	1.18 microhm-m
Mean Coefficient of Thermal Expansion	79-200	7.7 microin./in.-°F	26-100	13.8 X 10(-6)m/m-K
	79-1000	8.4 microin./in.-°F	26-500	14.9 X 10(-6)m/m-K
	79-1200	8.6 microin./in.-°F	26-600	15.3 X 10(-6)m/m-K
	79-1350	8.8 microin./in.-°F	26-700	15.7 X 10(-6)m/m-K
	79-1500	8.9 microin./in.-°F	26-800	16.0 X 10(-6)m/m-K
	76-1650	9.1 microin./in.-°F	26-900	16.3 X 10(-6)m/m-K
	79-1800	9.2 microin./in.-°F	26-1000	16.6 X 10(-6)m/m-K
Thermal Conductivity	70	63 Btu-in/ft²-hr-°F	20	9.7* W/m-K
	200	76 Btu-in/ft²-hr-°F	100	11.1 W/m-K
	500	98 Btu-in/ft²-hr-°F	300	14.7 W/m-K
	1100	144 Btu-in/ft²-hr-°F	600	20.6 W/m-K
	1300	159 Btu-in/ft²-hr-°F	700	22.8 W/m-K
	1500	174 Btu-in/ft²-hr-°F	800	25.0 W/m-K
	1700	189 Btu-in/ft²-hr-°F	900	27.4* W/m-K
Poisson's Ratio	-78 22	0.328 0.320	-108 72	0.328 0.320
Magnetic Permeability	Room	<1.002 at 200 oersteds (15,900 A/m)

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