Main Features

MA718 is a nickel base precipitation-enhanced type alloy, which has good creep strength and high-temperature strength up to 700.Since it also has excellent workability, weldability, and toughness in low temperatures, the alloy has a wide range of application and is used for gas turbines, aircraft components, spring parts for rockets, and parts used in low temperatures, etc.

Weldability/Workability

Arc welding and resistance welding are both possible under solid solution condition and aging condition, though aging is recommended to be done after welding. The heating and cooling during welding interferes with the hardening due to its slow aging precipitation property.

Available Product Forms

Various shapes, such as flat-rolled plates, forgings, welding wire, wire, welded pipes and tubes, seamless pipes and tubes can be manufactured.

Specifications

Information on specifications to which MA718 alloy can be ordered.

ASTM UNS N07718

Plates	Bars, Forgings
B670	B637

ASME UNS N07718

Bars, Forgings
SB-637

JIS NCF718

Plates	Bars
G4902	G4901

AMS UNS N07718

Plates	Bars, Forgings	Pipes and tubes
5596	5662	5589
5597	5663	5590
	5664

Mechanical Properties

Tensile properties in room temperature and high temperature

Heat treatment conditions	Testing temperature°C	Tensile strength N/mm2	Yield strength (0.2% expansion) N/mm2	Elongation(%)
925°C-1010°C WQ +720°CX 8hrs FC620°C X hr AC(Total 18hours)	-196 Room temperature 538 649 760	1640 1380 1200 1100 850	1195 1155 1020 960 795	26 24 20 20 35

Stress rupture strength (N/mm2) for each temperature (100hrs and 1000hrs)

	649°C	760°C
100hrs	723.7	303.0
1000hrs	593.3	>193.2

Impact value J (kgf•M)

	Charpy keyhole	Charpy V-notch
-196°C	21.7(2.22)	27.9(2.85)
Room temperature	18.8(1.92)	25.5(2.60)