Sandvik 8R70 Spring Wire

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Sandvik 8R70 Spring Wire
Categories:	Metal; Ferrous Metal; Special-Purpose Steel
Material Notes:	Sandvik 8R70 is a molybdenum-alloyed steel with very good corrosion resistance. The mechanical strength is somewhat lower than that of gusab T302. Service temperature: -200 to 300°C (-330 to 570°F) Information provided by Sandvik EN 1.4571
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Physical Properties	Metric	English	Comments

Density	8.00 g/cc	0.289 lb/in³

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	1080 - 1240 MPa @Diameter 7.00 - 8.50 mm	157000 - 180000 psi @Diameter 0.276 - 0.335 in
	1730 - 1980 MPa @Diameter 0.150 - 0.200 mm	251000 - 287000 psi @Diameter 0.00591 - 0.00787 in
Modulus of Elasticity	180 GPa	26100 ksi	as delivered
	185 GPa	26800 ksi	as tempered
Poissons Ratio	0.30	0.30	Calculated
Shear Modulus	69.0 GPa	10000 ksi	as received
	71.0 GPa	10300 ksi	as tempered

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000800 ohm-cm @Temperature 20.0 °C	0.0000800 ohm-cm @Temperature 68.0 °F
	0.0000950 ohm-cm @Temperature 300 °C	0.0000950 ohm-cm @Temperature 572 °F
Magnetic Permeability	1.004	1.004	µ

Thermal Properties	Metric	English	Comments
CTE, linear	16.5 µm/m-°C @Temperature 20.0 - 100 °C	9.17 µin/in-°F @Temperature 68.0 - 212 °F
	17.5 µm/m-°C @Temperature 20.0 - 300 °C	9.72 µin/in-°F @Temperature 68.0 - 572 °F
Specific Heat Capacity	0.500 J/g-°C @Temperature 50.0 - 100 °C	0.120 BTU/lb-°F @Temperature 122 - 212 °F
Thermal Conductivity	15.0 W/m-K @Temperature 20.0 °C	104 BTU-in/hr-ft²-°F @Temperature 68.0 °F
	19.0 W/m-K @Temperature 300 °C	132 BTU-in/hr-ft²-°F @Temperature 572 °F
Maximum Service Temperature, Air	300 °C	572 °F
Minimum Service Temperature, Air	-200 °C	-328 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.050 %	0.050 %
Chromium, Cr	17.5 %	17.5 %
Iron, Fe	67.3 %	67.3 %	As Balance
Manganese, Mn	1.5 %	1.5 %
Molybdenum, Mo	2.1 %	2.1 %
Nickel, Ni	11 %	11 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	0.50 %	0.50 %
Sulfur, S	<= 0.015 %	<= 0.015 %
Titanium, Ti	>= 0.30 %	>= 0.30 %

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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NSANDV269 / 19163

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