Deformed Steel Bars (Tor Steel) for Lintel Slabs
Introduction
Steel plays a major role in construction. Without steel reinforcement, modern concrete structures cannot be safe and strong. One of the most widely used reinforcements is the Deformed Steel Bar, commonly called Tor Steel. This bar is essential for structures like beams, slabs, and especially lintel slabs.
A lintel slab is a horizontal support beam placed above doors, windows, or openings in walls. It carries the load of the structure above and transfers it safely to the surrounding walls. Using high-quality Tor steel in lintel slabs ensures safety, durability, and long-lasting strength of the building.
This blog will explain everything you need to know about Deformed Steel Bars (Tor Steel) for Lintel Slabs in simple English.
What are Deformed Steel Bars (Tor Steel)?
Deformed steel bars are reinforcement bars with ribs or ridges on their surface. These ridges provide a strong grip with concrete, preventing any slipping.
The word “Tor Steel” comes from a special type of high-strength deformed steel bar that became popular in Europe and Asia. Over time, all deformed bars started being called Tor Steel in the construction industry.
Why Use Tor Steel in Lintel Slabs?
Lintel slabs carry the load of walls and roofs above openings like doors and windows. If weak steel is used, cracks can appear and even structural failure can happen.
Tor steel is used because:
Its ribs lock with concrete for a better bond.
It provides tensile strength, which concrete lacks.
It reduces risk of cracks and failures.
It makes lintel slabs more durable and earthquake-resistant.
It is economical, as less steel is required compared to smooth bars.
Properties of Deformed Steel Bars
Some of the key properties that make Tor steel the best choice are:
High Strength – 40–60% stronger than mild steel.
Better Bonding – Ridges create strong grip inside concrete.
Ductility – Can bend without breaking, useful in earthquakes.
Corrosion Resistance – Many Tor bars are treated to resist rust.
Cost Effective – Less steel is needed for the same strength compared to plain bars.
Fire Resistant – Retains strength even in high temperatures.
Grades of Tor Steel
Deformed steel bars come in different grades. The grade defines the yield strength of the bar.
Fe 415 – Basic grade, used in small residential buildings.
Fe 500 – Stronger, used in medium to high-rise buildings.
Fe 550 & Fe 600 – Very high strength, used in heavy structures like bridges.
In Pakistan, Fe 500 and Fe 550 Tor steel bars are most commonly used for lintel slabs and general construction.
Common Sizes of Tor Steel Bars
Steel bars come in different diameters, and each size has its own use:
8mm / 10mm – Used in slabs and flooring.
12mm / 16mm – Commonly used in lintel slabs and beams.
20mm / 25mm – Used in columns and heavy beams.
32mm and above – Used in special heavy structures.
For lintel slabs in residential houses, 12mm and 16mm Tor steel bars are most commonly used.
Process of Making Lintel Slabs with Tor Steel
Formwork Preparation – Wooden or steel shuttering is prepared.
Placing Bars – Tor steel bars are cut, bent, and placed as per design.
Tying Bars – Binding wire is used to hold bars in position.
Concrete Pouring – Concrete is poured to cover the bars completely.
Curing – Water curing is done for at least 7–14 days for strength.
Advantages of Deformed Steel Bars in Lintel Slabs
Excellent bond with concrete.
Higher load capacity.
Durable and long-lasting.
Earthquake and wind resistant.
Economical compared to mild steel.
Available in all major cities of Pakistan.
Disadvantages of Tor Steel
Slightly more expensive than mild steel.
Poor-quality Tor steel can rust quickly.
Needs skilled labor for bending and cutting.
Tor Steel vs Mild Steel Bars
| Feature | Tor Steel (Deformed) | Mild Steel (Plain) |
|---|---|---|
| Surface | Ribs / ridges | Smooth |
| Bond with Concrete | Very strong | Weak |
| Strength | High tensile strength | Lower tensile strength |
| Cost | Slightly higher | Lower |
| Usage | Slabs, beams, columns | Temporary structures |
Testing Methods for Steel Bars
Before using Tor steel, quality should be tested. Common tests include:
Tensile Strength Test – To check strength.
Bend and Re-bend Test – To check flexibility.
Weight per meter Test – To confirm correct diameter.
Chemical Test – To ensure low carbon and sulphur.
Price of Tor Steel in Lahore, Pakistan
The price of steel changes daily depending on the market. As of 2025:
10mm Tor bar – Rs. 260–270 per kg
12mm Tor bar – Rs. 255–265 per kg
16mm Tor bar – Rs. 250–260 per kg
20mm Tor bar – Rs. 250–260 per kg
(Prices vary by brand and market conditions.)
Popular Brands in Pakistan
Mughal Steel
Amreli Steel
Ittefaq Steel
Faizan Steel
Agha Steel
These brands provide high-quality Tor steel bars used for lintel slabs, slabs, beams, and columns.
Tips for Buying Tor Steel in Lahore
Always buy from a trusted dealer.
Check for brand marking on each bar.
Ask for mill test certificate.
Avoid rusted or damaged bars.
Compare prices from 2–3 suppliers.
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