In this blog post, I will try to explain Why TMT Bars are better than HYSD Bars. I will also explain differences between TMT bars and HYSD bars.
Table of Contents
What Is TMT BAR?
TMT stands for ‘Thermo Mechanical Treatment’ through which they are produced. They are manufactured by rolling hot steel wires and then passing them through the water. TMT bars have a hard external surface and a softcore inside, which helps in making the bars corrosion resistant and also enhances their weldability.
What Is HYSD Bar?
The full form of HYSD ‘High Yielding Strength Deformed’. It is high-strength construction steel that owes its superior strength (than mild steel) to the mechanical twisting of the cold bar which creates spiral ribs. Nonetheless, the cold twisting process results in a product with high residual stress, deformation, and surface defects.
Why TMT Bars are better than HYSD Bars: Key Reasons
- They have a stronger external layer when compared with HYSD due to the ductile microstructure at the core and the hard crystalline exterior surface of TMT steel.
- They have less residual stresses and more tensile strength compared to HYSD bars.
- They do not surface flaws when compared with HYSD because they do not require twisting or torsional stress.
- They have better corrosion-resistant properties than HYSD bars due to rapid quenching and tempering in the manufacturing process.
- They can be used in various types of construction works such as concrete structures, bridges, and flyovers, dams, thermal and hydro power plants, industrial structures, high-rise buildings, underground platforms in the metro railway, and rapid transport systems.
- They consume up to 17% to 20% less amount of steel than HYSD Bars.
- They are earthquake resistant because of their high tensile strength and flexibility.
- They are highly fire-resistant they can absorb 400 to 600 degrees Celsius of heat.
- They give longer life to the structure as they do not react with the concrete which helps to prevent rust other than HYSD Bars.
- They reduce the transportation cost and it is cost-effective too.
TMT Bars Vs HYSD Bars: Differences
I have described all the differences between TMT bars and HYSD bars. See the below table:
| Feature | TMT Bars | HYSD Bars |
|---|---|---|
| Full form | Thermo-Mechanically Treated Bars | High Yield Strength Deformed Bars |
| Manufacturing process | Hot-rolling followed by quenching and tempering | Hot-rolling followed by cold-twisting |
| Strength | Higher than HYSD bars | Lower than TMT bars |
| Ductility | Higher than TMT bars | Lower than TMT bars |
| Weldability | Good | Poor |
| Corrosion resistance | Better than HYSD bars | Less than TMT bars |
| Surface finish | Smooth and shiny | Rough and ribbed |
| Cost | Expensive | Cheaper than TMT bars |
| Grade | Fe 415, Fe 500, Fe 550, Fe 600 | Fe 415, Fe 500, Fe 550 |
| Tensile strength | 550-700 N/mm² | 460-600 N/mm² |
| Yield strength | 415-600 N/mm² | 415-500 N/mm² |
| Elongation | 14-18% | 10-12% |
| Fatigue strength | Higher than HYSD bars | Lower than TMT bars |
| Resistance to fire | Can withstand high temperatures | Slightly weaker |
| Bending ability | Can be bent without cracking or breaking | May crack or break when bent |
| Earthquake resistance | Good | Moderate |
| Weight | Lighter than HYSD bars | Heavier than TMT bars |
| Diameters | Available in a wide range of diameters | Limited range of diameters |
| Bond strength with concrete | Higher than HYSD bars | Lower than TMT bars |
| Flexibility | More flexible than HYSD bars | Less flexible than TMT bars |
| Sustainability | Energy-efficient manufacturing process | Requires more energy for manufacturing |
| Construction speed | Faster due to ease of handling and bending | Slower due to difficulty in handling and bending |
| Application | Suitable for high-stress applications | Suitable for low to medium-stress applications |
| Resistance to corrosion | Better than HYSD bars | Less than TMT bars |
| Quality assurance | Has higher quality standards | Has lower quality standards |
| Availability | Easily available in the market | Availability may be limited |
| Durability | Highly durable | Moderately durable |
| Use of scrap steel | Less usage of scrap steel | More usage of scrap steel |
| Resilience | Resilient against wear and tear | Slightly less resilient against wear and tear |
Advantages Of TMT Bars:
- TMT bars have a high tensile strength which enables them to bear heavy loads.
- TMT bars are corrosion-resistant, which increases their lifespan and makes them ideal for use in coastal areas.
- TMT bars have a high ductility, allowing them to bend and twist without breaking during construction.
- TMT bars have good weldability, which makes them easier to use in complex constructions.
- TMT bars are fire-resistant and can withstand high temperatures better than conventional steel bars.
- TMT bars have a superior bonding strength with concrete, ensuring the longevity of the structure.
- TMT bars have a smooth surface finish, which reduces the risk of corrosion.
- TMT bars are available in a variety of sizes and lengths, making them versatile for different construction projects.
- TMT bars are easy to transport and handle, reducing the chances of damage during transportation.
- TMT bars have a cost-effective price point, which makes them an attractive option for construction projects.
Advantages Of HYSD Bars:
- HYSD bars have a high strength to weight ratio, making them ideal for use in high-rise buildings and large structures.
- HYSD bars have a uniform surface finish, which enhances their durability and longevity.
- HYSD bars have good ductility, allowing them to withstand bending and twisting without breaking.
- HYSD bars have good weldability, which makes them easy to use in complex constructions.
- HYSD bars have a high resistance to corrosion, increasing their lifespan and making them ideal for use in coastal areas.
- HYSD bars have a high fatigue strength, making them ideal for use in structures that will undergo repetitive loads or stresses.
- HYSD bars have a superior bonding strength with concrete, ensuring the longevity of the structure.
- HYSD bars are available in a variety of sizes and lengths, making them versatile for different construction projects.
- HYSD bars are easy to transport and handle, reducing the chances of damage during transportation.
- HYSD bars have a cost-effective price point, which makes them an attractive option for construction projects.
Sum Up
This was all about TMT bar and HYSD bar. I hope you liked this blog article.
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