Sandvik Kanthal 155 R 55 Thermostatic bimetal

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Sandvik Kanthal 155 R 55 Thermostatic bimetal
Categories:	Metal; Superalloy; Iron Base
Material Notes:	KANTHAL 155 R 55 is a thermostatic bimetal which is recommended for use in the temperature range -20 to +350°C. In extreme cases it can be used at temperatures up to a maximum of +450°C. Typical applications for KANTHAL 155 R 55 are in circuit breakers, motor protection units, ammeters etc. High-expansive component: 15-7 Alloy(440 Designation, 47% of thickness) Low-expansive component: Invar 155 Alloy (450 Designation, 47% of thickness) Intermediate component: Nickel (400 Designation, 6% of thickness) Information provided by Sandvik Composition: High-expansive component: Designation 440; 6.9% Mn; 17% Ni; 76.1% Fe Low-expansive component: Designation 450; 0.12% Mn; 36.8% Ni; Bal. Fe
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Physical Properties	Original Value	Comments

Density	8.15 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Vickers	130	Low-expansive component
	140	High-expansive component
	210	Low-expansive component, Cold-worked 20%
	260	High-expansive component, Cold-worked 20%
Tensile Strength, Ultimate	450 MPa	Low-expansive component
	550 MPa	High-expansive component
Tensile Strength, Yield	240 MPa	High-expansive component
	290 MPa	Low-expansive component
Elongation at Break	40 %	High-expansive component
	40 %	Low-expansive component
Modulus of Elasticity	170 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000520 ohm-cm @Temperature 0.000 °C	Bimetal
	0.0000750 ohm-cm @Temperature 200 °C	Bimetal
	0.0000910 ohm-cm @Temperature 300 °C	Bimetal

Thermal Properties	Original Value	Comments
CTE, linear	0.500 µm/m-°C @Temperature 35.0 - 120 °C
	19.4 µm/m-°C @Temperature 30.0 - 120 °C	High-expansive component
Specific Heat Capacity	0.460 J/g-°C @Temperature 20.0 °C
Thermal Conductivity	16.0 W/m-K @Temperature 20.0 °C
Maximum Service Temperature, Air	450 °C
Minimum Service Temperature, Air	-20.0 °C

Descriptive Properties
Linearity Range, °C	-20 to 200
linearity Temperature Range, °C	-20 to 350
Specific thermal curvature, /K	0.0000282
Specific deflection, /K	0.000015

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