Formulas for given lenghs for <span title="angles,rounds,plates,channels,pipes">angles,rounds,plates,chan...</span> into kg?

Question

Formulas for given lenghs for angles,rounds,plates,chan... into kg?

Answer 1

Accurate general formulas for rolled shapes can not be provided because of the differences in the radii of fillets at the corners.

At best, approximate formulas which do not include the area o the fillets are used for estimating purposes, in the absence of tables showing the exact weight per unit length of the rolled shape. For steel materials these are as follows, using a unit weight of steel material of 40.8 lbs per square foot per inch thickness:

1. For angles

W = 40.8 x (b + d -t) x L x t/12

Where;

b and d = the heights of the legs of the angle in inches

t = thickness of the angle in inches

L = length of the angle in feet

W = weight of the angle in lbs

2. For channels, I beams and wide flange beams

W = 40.8L((h-2 x tf) x tw + 2b x tf)/12

Where;

h = the depth in inches

b = the width of the flange in inches

tf = the thickness of the flange in inches

tw = the thickness of the web in inches

L = the length of the rolled shape in feet

W = the weight of the rolled shape in lbs

3. For round bars

W = 40.8 x pi x D^2 x L/48

where;

D = the diameter of the bar in inches

L = the length of the bar in feet

W = the weight of the bar in lbs

4. For flat plates

W = 40.8 x b x L x t/12

Where;

b = the width of the plate in inches

t = the thickness of the plate in inches

L = the length of the plate in feet

W = the weight of the plate in lbs

To convert the values obtained with the above formulas into kg simply divide by 2.205.

Answer 2

These are provided in a table (pounds per foot or kg per meter) from the manufacturers that allows for the fillets and gussets that would be very difficult to put in to a formula.