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Steel bars are versatile construction materials that find widespread use in various applications within the construction and manufacturing industries. They come in various shapes, sizes, and grades to suit specific applications. 8 mm steel bar is one of the most used steel bar sizes in the construction industry.
What is an 8 mm steel bar?
8 mm refers to the size of the steel bar. Here size means the diameter of the bar which is the end-to-end measurement of the circular face of the bar. Therefore, an 8 mm steel bar means a steel round bar with a diameter of 8 mm.
Calculating the weight of 8 mm steel bar
One of the most asked questions by businesses using steel bars is how to calculate weight of steel bar with 8mm diameter. To calculate the weight of an 8 mm steel bar you must first begin by calculating its unit weight. Unit weight means the weight per meter of the steel bar.
The formula for calculating unit weight of steel bars is Weight (W) = Volume (V) x Density (D). Therefore, we must first calculate the volume of the bar to calculate steel unit weight. Density of the steel typically ranges from 7750 to 8000 kg/m3.
Let us look at how to calculate the unit weight of an 8 mm steel bar:
Here are the measurements of an 8 mm steel bar:
Height of the rod = 1 m
Diameter of the rod = 8 mm
Therefore, radius = 4 mm
Density = 7800 kg/m3
To apply the weight of steel bars formula we must first find out the volume of the steel bar:
Volume (V) = Area (A) x Height (h)
Unit area of the steel bar (A) = πr²
= 3.14 x 82
A = 201 mm2
Converting mm2 into m2
A = 201 mm2 = 0.000201 m2
Applying the formula V = A x H
= 0.000201 m2 x 1 m
= 0.000201 m3
Applying the formula for finding unit weight of an 8 mm steel bar
Weight = V x D
= 0.000201 m3 x 7800 kg/m3
= 1.57 kg
If the 8 mm steel bar is 5 m long, then you would need apply the formula ‘V=A x H’ and then apply the formula ‘Weight = V x D’ for the total weight of the steel bar.
Also read: Steel bar test: Testing of reinforcement steel bars
8 mm steel bar prices
Prices of steel bars depend on the length and grade of steel used to make the steel bar. It also varies according to manufacturers. Here is an 8 mm steel bar price list mentioning 8 mm steel products made by manufacturers of India:
| Manufacturer | 8mm steel bar price |
| Yashshree Enterprises, Pune | ₹61000/Tonne |
| Shree Meenaachi Steels, Dindigul | ₹85/Kg |
| Khinvasara Associates Construction Private Limited, Pune | ₹56/Kg |
| Kaustya Cemstee Private Limited, Hyderabad | ₹57000/Tonne |
| Shree Ji Steel Corporation, Kolkata | ₹45/Kg |
| Dhand Steel Traders, Ludhiana | ₹53000/Tonne |
| Ventura Alloy And Steels Private Limited, Mumbai | ₹145/Kg
|
| Hindustan Ferro Alloy Industries Private Limited, Pune | ₹70/Kg |
| R M Metal Industries, Mumbai
|
₹2500/Kg |
This price list was consolidated from Indiamart.
The weight of steel is generally measured in kilograms or tonnes. Construction projects usually source tonnes of steel bars as raw materials. Measuring the unit weight of steel bars is necessary to determine the load bearing capacity of pillars, columns, etc.
Grades and sizes of steel bars as per Indian Standard codes
Given below are the nominal size groups of steel bars and steel wires and their grades according to Indian Standard code:
| Group | Nominal size |
| Group I | 4 mm, 5 mm, 6 mm |
| Group II | 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 28 mm, 32 mm |
| Group III | 36 mm, 40 mm, 45 mm, 50 mm
|
| Group | Strength grade |
| Group 1 | Fe 415, Fe 415D, Fe 415S |
| Group 2 | Fe 500, Fe 500D, Fe 500S |
| Group 3 | Fe 550, Fe 550D |
| Group 4 | Fe 600 |
| Group 5 | Fe 650 |
| Group 6 | Fe 700 |
Source: https://bis.gov.in/wp-content/uploads/2020/07/PM-IS-1786-JULY-2020-Revised-4.pdf
Most common grades of steel round bars found in the market Fe 500 and Fe 550D.
Uses of steel bars
Have a look at the some of the common uses of steel bars:
- Reinforcing concrete
Steel bars, often referred to as steel reinforcement bars or rebar, are embedded in concrete structures to enhance their tensile strength. They provide structural support and prevent the concrete from cracking or collapsing under stress. This is crucial in the construction of buildings, bridges, highways, and other infrastructure.
- Structural components
Steel bars can be used to create structural frameworks in buildings, such as beams, columns, and trusses. They offer excellent strength and durability, making them ideal for supporting heavy loads in large structures.
- Machinery and equipment
Steel bars are used in the construction of heavy machinery, equipment, and vehicles due to their high strength and durability. They are often used to create axles, gears, and other critical components.
- Fencing and security
Steel bars are commonly used to create security fences and barriers. They are durable and provide an effective means of securing properties, industrial sites, and sensitive areas.
- Manufacturing and fabrication
Steel bars are used in manufacturing processes to produce a wide range of products, from small tools and fasteners to large machinery and industrial equipment.
- Support in foundations
In the construction of deep foundations, steel bars are used to reinforce the structure and provide stability, particularly in areas with unstable soil or high load requirements.
- Concrete piles
In the construction of foundations for bridges, buildings, and other structures, steel bars are used in the fabrication of concrete piles. These piles provide stability and support for the structure.
- Agriculture
Steel bars are used in the construction of agricultural equipment and machinery, such as plows, harrows, and tillers.
- Marine applications
In the shipbuilding industry, steel bars are used to create the framework and support structures for ships and offshore platforms, as they can withstand the harsh conditions of the sea.
- Infrastructure projects
Steel bars are integral to infrastructure projects, including the construction of tunnels, dams, and retaining walls, where their strength and durability are essential.
- Automobiles
Steel bars are used in the manufacturing of vehicle chassis and frames, providing strength and safety to the overall structure.
- Railway tracks
Steel bars, often in the form of steel rails, are used to create the tracks for railways, ensuring durability and stability for trains.
Steel bars come in various shapes, sizes, and grades to suit specific applications. The choice of steel bar depends on the intended use and the specific requirements of the project or product. The total price of the steel bar will also include GST on steel bar.
If you are looking to source a batch of 8 mm steel bar or steel bars or other sizes do visit Tata nexarc. Our platform can give you access to numerous steel suppliers and manufacturers across India who can match all your steel requirements at competitive prices. We extend credit options to our clients and a hassle-free application process to procure steel.
