Mild Steel Square Bars

Reference data and engineering information about mild steel square bars for material properties applications.

mildsteelsquarebars

Overview

Engineering reference data for Mild Steel Square Bars in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

Symbol	Description	Unit
$\sigma$	Stress	Pa
$\varepsilon$	Strain	—
$E$	Young's modulus	Pa
$\alpha$	Thermal expansion coefficient	1/°C
$\Delta T$	Temperature change	°C

Data Table

15 rows

Weight per meter for mild steel square bars of common dimensions
Bar Side(mm)	Weight(kg/m)
8	0.5
10	0.79
12.5	1.22
16	2.01
20	3.14
25	4.91
30	7.07
32	8.04
40	12.6
45	15.9
50	19.6
60	28.3
75	44.2
90	63.6
100	78.5

Source: engineeringtoolbox.com

Calculation Explanation

The weight of a mild steel square bar is determined by its cross-sectional area, length, and the density of steel. The general formula simplifies this for a unit length of one meter:

$W = 0.00785 \cdot s^2$

Where:

$W$ is the weight in kilograms per meter (kg/m).
$s$ is the side length of the square bar in millimeters (mm).
The coefficient 0.00785 is derived from the density of mild steel (~7850 kg/m³) and includes unit conversions to express the result directly in kg/m when $s$ is in mm.