Iron, Fe

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Iron, Fe
Categories:	Metal; Pure Element
Material Notes:	Cast irons and a very extensive listing of steels are also in MatWeb.
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Physical Properties	Metric	English	Comments

Density	7.87 g/cc	0.284 lb/in³

Chemical Properties	Metric	English	Comments
Atomic Mass	55.845	55.845	1995
Atomic Number	26	26
Thermal Neutron Cross Section	2.53 barns/atom	2.53 barns/atom
X-ray Absorption Edge	1.743 Å	1.743 Å	K
	14.601 Å	14.601 Å	L_I
	17.169 Å	17.169 Å	L_II
	17.4838 Å	17.4838 Å	L_III
Electrode Potential	-0.0400 V	-0.0400 V
Electronegativity	1.83	1.83	Pauling
Ionic Radius	0.640 Å	0.640 Å	Crystal Ionic Radius for Valence +3
	0.740 Å	0.740 Å	Crystal Ionic Radius for Valence +2
Electrochemical Equivalent	0.695 g/A/h	0.695 g/A/h	trivalent
	1.042 g/A/h	1.042 g/A/h	divalent

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	146	146	Converted from Vickers for 3000 kg load/10 mm ball Brinell test
Hardness, Rockwell A	49	49	Converted from Vickers
Hardness, Rockwell B	79	79	Converted from Vickers
Hardness, Vickers	150	150
Tensile Strength at Break	540 MPa	78300 psi
Tensile Strength, Yield	50.0 MPa @Strain 0.5 %	7250 psi @Strain 0.5 %	after zone refining
Modulus of Elasticity	200 GPa	29000 ksi
Bulk Modulus	166 GPa	24100 ksi
Poissons Ratio	0.291	0.291
Shear Modulus	77.5 GPa	11200 ksi	Calculated

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.00000890 ohm-cm	0.00000890 ohm-cm

Thermal Properties	Metric	English	Comments
Heat of Fusion	272 J/g	117 BTU/lb
Heat of Vaporization	6615 J/g	2846 BTU/lb
CTE, linear	12.2 µm/m-°C @Temperature 20.0 - 100 °C	6.78 µin/in-°F @Temperature 68.0 - 212 °F
	15.0 µm/m-°C @Temperature 250 °C	8.33 µin/in-°F @Temperature 482 °F
	16.0 µm/m-°C @Temperature 500 °C	8.89 µin/in-°F @Temperature 932 °F
	24.0 µm/m-°C @Temperature 1000 °C	13.3 µin/in-°F @Temperature 1830 °F	Gamma Phase
Specific Heat Capacity	0.440 J/g-°C	0.105 BTU/lb-°F
Thermal Conductivity	76.2 W/m-K	529 BTU-in/hr-ft²-°F
Melting Point	1535 °C	2795 °F
Boiling Point	2861 °C	5182 °F

Optical Properties	Metric	English	Comments
Emissivity (0-1)	0.35 @Wavelength >=650 nm, Temperature 927 °C	0.35 @Wavelength >=650 nm, Temperature 1700 °F
Reflection Coefficient, Visible (0-1)	0.65	0.65	1500 nm

Component Elements Properties	Metric	English	Comments
Iron, Fe	100 %	100 %

Descriptive Properties
CAS Number	7439-89-6

References for this datasheet.

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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