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Length X Width X Depth = volume
Volume in cubic units = pi*radius2*length
Use the formula for a cylinder to find out the volume. Then multiply the volume by the density of steel (about 7900 kg/m3 - but it may vary slightly depending on the type of steel).
Find the volume of the sample (Length times width times height) and multipy by the density coefficient.
An equation that gives the coefficient of thermal expansion of whatever the material is.