HAYNES^® 718 alloy Information

An aged-hardenable Ni-Fe-Cr-Cb-Mo-Ti-Al alloy that combines excellent strength to 1200°F (650°C) with good ductility, formability, and weldability.

Principal Features

Health and Safety

Typical Physical Properties

	Temp., °F	British Units	Temp., °C	Metric Units
Density	Room	0.297 lb/in.³	Room	8.23 g/cm.³
Melting Range	2300-2435		1260-1335

Electrical Resistivity	Room	47.5 microhm-in.	Room	121 microhm-cm
	200	48.0 microhm-in.	100	122 microhm-cm
	400	49.4 microhm-in.	200	125 microhm-cm
	600	50.3 microhm-in.	300	127 microhm-cm
	800	50.7 microhm-in.	400	129 microhm-cm
	1000	51.6 microhm-in.	500	130 microhm-cm
	1200	52.0 microhm-in.	600	132 microhm-cm
	1400	52.2 microhm-in.	700	132 microhm-cm
	1600	52.1 microhm-in.	800	132 microhm-cm
	1800	52.4 microhm-in.	900	133 microhm-cm
			1000	133 microhm-cm

Mean Coefficient of Thermal Expansion	70-200	7.1 microinches/in.-°F	25-100	12.8 μm/m-°C
	70-400	7.5 microinches/in.-°F	25-200	13.5 μm/m-°C
	70-600	7.7 microinches/in.-°F	25-300	13.8 μm/m-°C
	70-800	7.9 microinches/in.-°F	25-400	14.1 μm/m-°C
	70-1000	8.0 microinches/in.-°F	25-500	14.3 μm/m-°C
	70-1200	8.4 microinches/in.-°F	25-600	14.8 μm/m-°C
	70-1400	8.9 microinches/in.-°F	25-700	15.5 μm/m-°C
	70-1600	9.4 microinches/in.-°F	25-800	16.3 μm/m-°C
			25-900	17.2 μm/m-°C

Thermal Conductivity	Room	79 Btu-in./ft.² hr.-°F	Room	11.4 W/m-K
	200	87 Btu-in./ft.² hr.-°F	100	12.6 W/m-K
	400	100 Btu-in./ft.² hr.-°F	200	14.3 W/m-K
	600	112 Btu-in./ft.² hr.-°F	300	15.9 W/m-K
	800	124 Btu-in./ft.² hr.-°F	400	17.5 W/m-K
	1000	136 Btu-in./ft.² hr.-°F	500	19.0 W/m-K
	1200	148 Btu-in./ft.² hr.-°F	600	20.6 W/m-K
	1400	161 Btu-in./ft.² hr.-°F	700	22.2 W/m-K
	1600	173 Btu-in./ft.² hr.-°F	800	23.8 W/m-K
	1800	186 Btu-in./ft.² hr.-°F	900	25.4 W/m-K
	-	-	1000	27.1 W/m-K