# Weight Calculation of Square Steel Bars (Solid + Hollow) Weight Calculation of Square Steel Bars

## Square Steel Bars

Square steel bar, which has a grainy texture and radius level corners, is a very robust and adaptable building material. Carbon steel square bar stock is one of the most often used industrial and construction materials in the world due to its durability, adaptability, and affordability. Square steel bar exists in the form of various shape such as pipes and tubes.

The material of square steel bars is usually mild steel with yield strength of 250 MPa.

Square tubes and square steel pipes are used for a variety of civil engineering projects, including the construction of buildings and the assembly of various types of machinery in factories. They are also used in the welding of various pieces of equipment.

In this topic, we look at the method for calculation of weight of square steel bars: both the solid and hollow steel bars.

## Data Required for Steel Weight Calculation

To calculate the weight of steel, we need to things:

1. The unit weight
2. The volume of steel

## What is Unit Weight of Steel?

The unit weight of a material is:

the weight per unit volume of a material.

The unit weight of steel (we also call it density) is approximately:

• 78.5 kN/m3
• 7850 kg/m3
• 490 lbs/ft3
• 13231 lbs/yd3

## What is Volume of Steel Bar?

The volume equals:

Area * length

Since the bar is square, the area is (side)2

## How to Calculate the Weight of Steel?

Steel weight calculation is done by with the help of steel weight formula.

The general formula is:

Weight of square bar = Unit Weight (density) x Volume

### Solid Square Steel Bar

Calculate weight of a 50 mm square Steel bar with a length of 1 meter:

Square steel bars feature equal-length edges and square-shaped areas. If a steel square’s edge length is 50 mm on one side and all other sides are 50 mm, the steel bar is square and has an identical edge length on all sides.

Side length = 50 mm

Side length = 50 mm / 1000 = 0.05 m (converting from mm to m)

Cross-sectional area = (side length)2 = 0.05 * 0.05 = 0.0025 m2

Weight of square bar = Unit Weight of steel x Volume

Unit Weight of steel = 7850 kg/m3

The volume equals:

Area * length

Weight of square bar = 7850 *  0.0025 * 1 m =

W = 19.625 kg/m

This means that each 1 m of this square bar has a weight of 19.625 kg.

#### What if the length of the bar is more or less than 1 m?

The weight will be equal to the weight/m * total length

If the length is 3.5 m,

The weight of the bar = 19.625 * 3.5 = 68.69 kg

### Hollow Square Steel Bar

What differs in this case is the volume; specifically the area will be changed.

Calculate weight of a 50 mm hollow square Steel bar with a length of 1 meter; the thickness is 10 mm:

Square steel bars feature equal-length edges and square-shaped areas. If a steel square’s edge length is 50 mm on one side and all other sides are 50 mm, the steel bar is square and has an identical edge length on all sides.

Side length = 50 mm

Side length = 50 mm / 1000 = 0.05 m (converting from mm to m)

Thickness = 10 mm = 0.01 m

Cross-sectional area = (side length)2 – (side length – 2*thickness)2

Cross-sectional area = 0.05 * 0.05 – (0.05 – 0.02) * (0.05 – 0.02) = 0.0016 m2

Weight of square bar = Unit Weight of steel x Volume

Weight of square bar = 7850 *  0.0016 * 1 m = 12.56 kg/m

Weight Calculation of Square Steel Bars