### How to calculate the weight of hollow square steel section.

Let us consider a hollow mild steel square section ( tube or pipe) of dimension 50mm × 50mm.× 2mm. as shown in the drawing below. Let us take a pipe of 1meter length. Hollow mild steel square section

Here, thickness T = 2mm.  breadth B = 50mm and length L =1m. Hollow steel square tube.

First, we will calculate the sectional area in two parts, the orange-colored part area as A1, and green colored part area as A2.

Area A1 = Breadth( B) × Thickness (T) × 2nos.
= 50mm × 2mm. × 2nos.

By converting mm. unit into meters, we get

= 0.05 × 0.002 × 2

= 0.0002 square meter.

Area A2  =[ { B - ( 2 × T )} × T × 2 nos]

= [ { 50mm. - ( 2 × 2mm. )} × 2mm. × 2 nos]

=[ 46 mm × 2mm. ×2nos.]

= 0.046 × 0.002 × 2

= 0.000184 square meter.

Now, total sectional area A = A1 +A2

= 0.0002 +0.000184

= 0.000384 square meter.

As you know, volume =  area × length

= A  × L

= 0.000384 × 1

=  0.000384 cubic meter.

The density of mild steel is 7850 kg./cum.

So, the weight of the hollow square MS tube

= volume × density

= 0.000384 × 7850

= 3.014 kg.

For you 👇

### Alternate method:

First, we will calculate the total area inclusive of the hollow part, and then we will deduct the pipe's inner hollow portion (shown in brown color).

Area a1   = B × B

= 50mm × 50mm

By converting mm. unit into meters, we get

a1 = 0.05 × 0.05

= 0.0025 square meter.

Area a2 =  46mm.× 46 mm.

( i.e. inner hollow part )

= 0.046  ×0.046

= 0.002116 square meter.

Now, the total sectional area

A = a1 - a2

=0.0025 - 0.002116

= 0.000384 square meter.

Note: We got the same area (A ) as calculated before.

Volume = 0.00384  × 1

=  0.000384 cubic meter.

So, the weight of the hollow square MS tube

= volume × density

= 0.000384 × 7850

= 3.014 kg.

PART 1👈 Back                                             continued 👉 PART 3

Thank you for going through this calculation😃.

If you have any queries, you can ask me below in the comment section.

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