Chromium, Cr; Annealed

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Chromium, Cr; Annealed
Categories:	Metal; Nonferrous Metal; Pure Element
Material Notes:	Annealed applies only to tensile and/or hardness values; other property values are typical of the element.
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Physical Properties	Metric	English	Comments

Density	7.19 g/cc	0.260 lb/in³

Chemical Properties	Metric	English	Comments
Atomic Mass	51.9961	51.9961	1995
Atomic Number	24	24
Thermal Neutron Cross Section	2.9 barns/atom	2.9 barns/atom
X-ray Absorption Edge	2.07 Å	2.07 Å	K
	18.256 Å	18.256 Å	L_I
	21.226 Å	21.226 Å	L_II
	21.5958 Å	21.5958 Å	L_III
Electrode Potential	-0.560 V	-0.560 V
Electronegativity	1.66	1.66	Pauling
Ionic Radius	0.520 Å	0.520 Å	Crystal Ionic Radius for Valence +6
	0.630 Å	0.630 Å	Crystal Ionic Radius for Valence +3
	0.810 Å	0.810 Å	Crystal Ionic Radius for Valence +1
	0.890 Å	0.890 Å	Crystal Ionic Radius for Valence +2
Electrochemical Equivalent	0.971 g/A/h	0.971 g/A/h

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	80	80	Converted from Vickers for 500 kg load/10 mm ball Brinell test.
Hardness, Knoop	102	102	Converted from Vickers
Hardness, Rockwell B	48	48	Converted from Vickers
Hardness, Vickers	90	90
Charpy Impact, Unnotched	2.00 J	1.48 ft-lb	Unspecified Heat Treatment.

Electrical Properties	Metric	English	Comments
Electrical Resistivity	5.00e-7 ohm-cm @Temperature -260 °C	5.00e-7 ohm-cm @Temperature -436 °F
	0.0000130 ohm-cm @Temperature 20.0 °C	0.0000130 ohm-cm @Temperature 68.0 °F
	0.0000180 ohm-cm @Temperature 152 °C	0.0000180 ohm-cm @Temperature 306 °F
	0.0000200 ohm-cm @Temperature 200 °C	0.0000200 ohm-cm @Temperature 392 °F
	0.0000310 ohm-cm @Temperature 407 °C	0.0000310 ohm-cm @Temperature 765 °F
	0.0000400 ohm-cm @Temperature 600 °C	0.0000400 ohm-cm @Temperature 1110 °F
	0.0000470 ohm-cm @Temperature 652 °C	0.0000470 ohm-cm @Temperature 1210 °F
	0.0000660 ohm-cm @Temperature 1000 °C	0.0000660 ohm-cm @Temperature 1830 °F
Magnetic Susceptibility	0.0000035	0.0000035	cgs/g

Thermal Properties	Metric	English	Comments
Heat of Fusion	293.1 J/g	126.1 BTU/lb
Heat of Vaporization	5945 J/g	2558 BTU/lb
CTE, linear	6.20 µm/m-°C @Temperature 20.0 - 100 °C	3.44 µin/in-°F @Temperature 68.0 - 212 °F
Specific Heat Capacity	0.461 J/g-°C	0.110 BTU/lb-°F
Thermal Conductivity	69.1 W/m-K	480 BTU-in/hr-ft²-°F
Melting Point	1860 °C	3380 °F
Boiling Point	2671 °C	4840 °F

Optical Properties	Metric	English	Comments
Emissivity (0-1)	0.10 @Temperature 50.0 °C	0.10 @Temperature 122 °F	polished, total radiation
Reflection Coefficient, Visible (0-1)	0.70	0.70	500 nm

Component Elements Properties	Metric	English	Comments
Chromium, Cr	100 %	100 %

Descriptive Properties
CAS Number	7440-47-3

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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