Extramet EMT 812 Tungsten Carbide, Medium-Coarse Grade

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Extramet EMT 812 Tungsten Carbide, Medium-Coarse Grade
Categories:	Ceramic; Carbide
Material Notes:	EMT 812, a medium-coarse grade, has the highest shock resistance/toughness and the lowest wear resistance of the Extramet EMT product line. EMT 812 is a homogenous mixture of tungsten carbide grains in a tough cobalt binder matrix. The carbide grains are fused into a solid matrix of cobalt metals. The metal carbide’s grains are “cemented” in the binder metal’s matrix. Information provided by Extramet
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Physical Properties	Metric	English	Comments

Density	14.05 - 14.25 g/cc	0.5076 - 0.5148 lb/in³	ISO 3369
Porosity	<= 2.0 %	<= 2.0 %	A, Basic; ISO 4505
	<= 2.0 %	<= 2.0 %	B, Particular; ISO 4505
	<= 2.0 %	<= 2.0 %	C-Porosity; ISO 4505
Grain Size	2.5 µm	2.5 µm	Average

Mechanical Properties	Metric	English	Comments
Hardness, Vickers	1280 - 1380	1280 - 1380	ISO 3878
Modulus of Rupture	>= 3.20 GPa	>= 464 ksi	Transverse Rupture Strength

Component Elements Properties	Metric	English	Comments
Cobalt, Co	12 %	12 %	Metals Basis
Other	1.2 %	1.2 %	Other Carbides
Tungsten, W	86.8 %	86.8 %	Metals Basis

Descriptive Properties
Coercive Force	10.0-12.5 kA-m^-1		ISO 3226
Magnetic Saturation 4no	175-210 µT-m3-kg^-1

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PEMT007 / 312238

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