Mar-M 247(Ni-Co-W-Cr-Ta)

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1. Introduce

– A nickel-base superheat-resistant alloy with polycrystalline solidification

– Alloys developed for applications requiring high strength at high temperatures up to about 1000℃

* Mar M : Cast polycrystalline nickel-based super heat-resistant alloy

* Mar : Ni-based alloys with improved high temperature strength by adding alloying elements such as Co, Cr, Ta, etc.

2. Property

– High strength, low thermal conductivity, creep and oxidation resistance, corrosion resistance, excellent work hardenability

Element	Impact
Ni	Provides excellent strength and corrosion resistance
Co	Precipitation strengthening element, provides strength, creep properties
W	Solid solution strengthening element, provides high temperature creep properties
Cr	Provides corrosion resistance, oxidation resistance
Ta	Provides high temperature strength

[Mar-M 247 Chemical Composition (%)]

Ni	Cr	C	Al
66.16 ~ 68.24	8.00 ~ 8.50	0.06 ~ 0.09	5.40 ~ 5.70

Si	Mn	Co	W
Max. 0.25	Max. 0.10	9.00 ~ 9.50	9.30 ~ 9.70

[Mar-M 247 Mechanical Properties]

	Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)
Anealed	1250	750	20

[Mar-M 247 Physical Properties]

Density (g/㎤)	Melting Range (℃)
7.80	1240 ~ 1330

3. Available Form

– Bar, Rod

– Sheet, Plate, Strip

– Wire, Coil

4. Application & Product

– Aerospace

Application	Product
Aerospace	Combustors, Turbine engine parts, High pressure turbine blades and vanes, Rotors, Disks, Turbocharger wheels, Turbopump turbine nozzles, Turbopump impellers