Sandvik Kanthal 140 R 140 Thermostatic bimetal

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Sandvik Kanthal 140 R 140 Thermostatic bimetal
Categories:	Metal; Superalloy; Iron Base
Material Notes:	KANTHAL 140 R 140 is a thermostatic bimetal which is recommended for use in the temperature range -20 to +250°C. Typical applications for KANTHAL 140 R 140 are in circuit breakers, motor protection units, thermostats, shower mixers, etc. High-expansive component: 74-24-1 Alloy (410 Designation, 81% of thickness) Low-expansive component: Invar 155 Alloy (450 Designation, 19% of thickness) Information provided by Sandvik Composition: High-expansive component: Designation 410; 74% Mn; 24.5% Ni; 1% Cu Low-expansive component: Designation 450; 0.12% Mn; 36.8% Ni; Bal. Fe
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Physical Properties	Original Value	Comments

Density	7.40 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Vickers	120	High-expansive component
	130	Low-expansive component
	200	Low-expansive component, Cold-worked 20%
	230	High-expansive component, Cold-worked 20%
Tensile Strength, Ultimate	450 MPa	Low-expansive component
	540 MPa	High-expansive component
Tensile Strength, Yield	260 MPa	High-expansive component
	290 MPa	Low-expansive component
Elongation at Break	40 %	Low-expansive component
	50 %	High-expansive component
Modulus of Elasticity	130 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.000138 ohm-cm @Temperature 0.000 °C	Bimetal
	0.000148 ohm-cm @Temperature 200 °C	Bimetal
	0.000152 ohm-cm @Temperature 300 °C	Bimetal

Thermal Properties	Original Value	Comments
CTE, linear	0.500 µm/m-°C @Temperature 30.0 - 130 °C
	26.9 µm/m-°C @Temperature 30.0 - 130 °C	High-expansive component
Specific Heat Capacity	0.460 J/g-°C @Temperature 20.0 °C
Thermal Conductivity	4.00 W/m-K @Temperature 20.0 °C
Maximum Service Temperature, Air	330 °C
Minimum Service Temperature, Air	-20.0 °C

Descriptive Properties
Linearity Range, °C	-20 to 200
linearity Temperature Range, °C	-20 to 250
Specific thermal curvature, /K	0.0000261
Specific deflection, /K	0.000014

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