gray cast iron round tube weight calculator

Enter the dimensions of a gray cast iron round tube and this works out its volume and weight. Gray iron, where the carbon is present as graphite flakes. Ranges 7100-7300 with the grade.

Outside diameter

Wall thickness

Length

Number of pieces

Total weight

3.189 34kg

≈ Rounded gray cast iron round tube weight Show in

Weight of one round tube: 3.189 34
Volume of one piece: 442.965
Weight per metre of length: 3.189 34 kg/m
Density used: 7200 kg/m3

Show the working

Outside diameter = 50
Wall thickness = 3
Length = 1000
Number of pieces = 1
volume_mm3 = pi/4 * (50^2 - (50 - 2*3)^2) * 1000 = 442 965
Volume of one piece = 442 965 / 1000 = 442.965
Density used = 7200 = 7200
Weight of one round tube = 442 965 * 7200 / 1e9 = 3.189 34
Total weight = 3.189 34 * 1 = 3.189 34
Weight per metre of length = 442 965 / 1000 * 1000 * 7200 / 1e9 = 3.189 34

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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The formula

Volume = (pi / 4) x (OD^2 - ID^2) x length, where ID = OD - 2 x wall
Weight = volume x density, with density = 7200 kg/m3
One cubic millimetre of a material at 1000 kg/m3 weighs exactly one milligram, so the millimetre-to-kilogram step is a shift of the decimal point rather than a rounded factor.

Gray iron, where the carbon is present as graphite flakes. Ranges 7100-7300 with the grade.

Dimensions are nominal. Mill tolerances on thickness, and the corner radii on formed sections, both move the real weight by a percent or two.

Every field takes inches or feet as readily as millimetres: change the unit next to it and the conversion is done exactly before the arithmetic starts.

Frequently asked

What is the density of gray cast iron?

7200 kg/m3, which is 7.200 g/cm3. Gray iron, where the carbon is present as graphite flakes. Ranges 7100-7300 with the grade.

How do you calculate the weight of a gray cast iron round tube?

Volume = (pi / 4) x (OD^2 - ID^2) x length, where ID = OD - 2 x wall. Multiply the volume by the density of gray cast iron, 7200 kg/m3, taking care that both are in the same unit system.

Can I enter dimensions in inches?

Yes. Each dimension field has its own unit selector, and inch, foot, millimetre, centimetre and metre entries are all converted exactly before anything is multiplied.

Where the numbers come from

Densities are nominal room-temperature values for the grade named, drawn from the usual mill and handbook figures.