Sandvik Springflex SF Spring Wire

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Sandvik Springflex SF Spring Wire
Categories:	Metal; Ferrous Metal; Austenitic; Ferritic; Stainless Steel
Material Notes:	Sandvik Springflex SF is a duplex (austenitic-ferritic) stainless steel especially designed for spring applications with extremely high fatigue requirements. The grade is characterized by: Exceptionally good fatigue resistance High resistance to stress corrosion cracking (SCC) in chloride-bearing environments High resistance to general corrosion, pitting, and crevice corrosion High resistance to erosion corrosion and corrosion fatigue Physical properties that offer design advantages Service temperature: -100 to 300°C (-150 to 570°F) Information provided by Sandvik
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Physical Properties	Original Value	Comments

Density	7.80 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	900 - 1800 MPa
	1350 - 1550 MPa @Diameter 5.00 - 8.00 mm
	1450 - 1650 MPa @Diameter 3.50 - 5.00 mm
	1550 - 1750 MPa @Diameter 2.00 - 3.50 mm
	1700 - 1900 MPa @Diameter 1.25 - 2.00 mm
	1800 - 2000 MPa @Diameter 0.800 - 1.25 mm
	1900 - 2100 MPa @Diameter 0.500 - 0.800 mm
Tensile Strength, Yield	765 - 1530 MPa @Strain 0.2 %	Flatwire
	1135 - 1335 MPa @Diameter 5.00 - 8.00 mm, Strain 0.2 %
	1220 - 1420 MPa @Diameter 3.50 - 5.00 mm, Strain 0.2 %
	1305 - 1505 MPa @Diameter 2.00 - 3.50 mm, Strain 0.2 %
	1430 - 1630 MPa @Diameter 1.25 - 2.00 mm, Strain 0.2 %
	1515 - 1715 MPa @Diameter 0.800 - 1.25 mm, Strain 0.2 %
	1600 - 1800 MPa @Diameter 0.500 - 0.800 mm, Strain 0.2 %
Modulus of Elasticity	200 GPa	as delivered
	205 GPa	tempered
Poissons Ratio	0.30	as delivered; Calculated
	0.30	Tempered; Calculated
Shear Modulus	77.0 GPa	as delivered
	79.0 GPa	tempered

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000840 ohm-cm @Temperature 20.0 - 100 °C

Thermal Properties	Original Value	Comments
CTE, linear	11.5 µm/m-°C @Temperature 30.0 - 200 °C	Cold worked
	11.5 µm/m-°C @Temperature 30.0 - 300 °C	Cold worked
	12.0 µm/m-°C @Temperature 30.0 - 400 °C	Cold worked
	12.5 µm/m-°C @Temperature 30.0 - 100 °C	Cold worked
	13.0 µm/m-°C @Temperature 30.0 - 100 °C	Aged
	13.5 µm/m-°C @Temperature 30.0 - 200 °C	Aged
	13.5 µm/m-°C @Temperature 30.0 - 300 °C	Aged
	14.0 µm/m-°C @Temperature 30.0 - 400 °C	Aged
Specific Heat Capacity	0.500 J/g-°C @Temperature 50.0 - 100 °C
Thermal Conductivity	14.0 W/m-K @Temperature 20.0 °C
	16.0 W/m-K @Temperature 100 °C
	17.0 W/m-K @Temperature 200 °C
	19.0 W/m-K @Temperature 300 °C
Maximum Service Temperature, Air	300 °C
Minimum Service Temperature, Air	-100 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.030 %
Chromium, Cr	22 %
Manganese, Mn	0.90 %
Molybdenum, Mo	3.2 %
Nickel, Ni	5.0 %
Nitrogen, N	0.18 %
Phosphorus, P	<= 0.030 %
Silicon, Si	0.50 %
Sulfur, S	<= 0.015 %

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NSANDV5233 / 199797

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