Who wouldn’t love to live in their dream house? Building a new home is like a life lottery. Therefore we are more careful in taking every step in the process. We would draft a realistic budget, think about the flooring, walls, and safety, and talk with TMT Bars Manufacturers if we can buy the materials in Bulk and several other aspects. However, selecting the right and reliable building materials is essential for a long-lasting building. Are you all set for your first construction project? Does an increase in budget bothers you? If you are all set to commence your building project, please read the article as it guides you in selecting reliable TMT rods for your construction project. It also talks about the effects of purchasing building materials in bulk quantities.
Factors to keep in mind when you are buying TMT bars in Bulk:
You can’t choose any random building material and expect extraordinary accomplishments in construction projects. Here we have shared some key factors to consider when you are buying the construction materials like TMT bars in Bulk:
How flexible is it?
The IS standards recommend using TMT bars with Fe500d grade for earthquake-prone areas. The Fe500d grade TMT bars possess an ultimate tensile strength of 565N/mm. They only have a maximum of 0.25% carbon, phosphorous, and sulphur. Thus, they are capable of bearing sudden loads during earthquakes or floods. If you are looking for a perfect blend of strength and flexibility for your dream house, you should select the Fe 500d grade TMT bars. Moreover, based on IS standard recommendations, this category can be used for almost every construction project and is considered the best in the market.
Also, if you dream about building contemporary-looking and graceful architecture, you should consider this factor supremely. In the new age construction, we can expect lots of bending and re-bending of TMT bars. If the TMT bars are not flexible, they will not withstand stronger shockwaves. So what should you choose?
Some of the best quality TMT rebars with FE500 grade are expected to have about 660 N/mm tensile strength. The tensile strength and flexibility of TMT bars go hand in hand. Using the TMT bars with 660 N/mm2 tensile strength increases the resistance of Steel and prevents forming of any cracks in the bars. If any stress develops during a severe earthquake, it is distributed along the bar and causes it to elongate. This phenomenon prevents the crumbling of the building. Thus, some of the Top TMT Bar Manufacturers recommend TMT bars with higher tensile strength as they avoid the failure of your construction project!
The manufacturing process can impact the quality of TMT rods:
TMT bars undergo a unique manufacturing process called thermal processing. The industrial process of thermal processing involves compression, rolling through heat treatment and quenching.
During the quenching process, the TMT rods are cooled after they are heated at a critical temperature. The heated materials are immersed in a fluid such as water, oil or air. This process quickly lowers the surface’s temperature, whereas the inner portions of the materials remain hotter. The quenching process is carried out in a controlled environment, where the unique water system cools only the surface of the TMT rod, and the inner portion remains hotter. Just after the quenching process, the surface turns into hard martensite; this is why the TMT bars can withstand higher pressure and stress.
During the self-tempering, the inner residual temperature after the quenching process is left to cool down at its own pace. The residual temperature is used to reheat the material throughout for everyday cooling.
Why is the core expected to stay softer for a longer time? It improves the bar’s tensile strength and flexibility! During the quenching process, the bar’s core is allowed to cool at its own pace, allowing the centre to remain soft and austenitic. This enables the bar to improve its tensile strength and flexibility. It also allows bars to elongate when put under pressure enabling them to withstand heavy loads and thus useful for large-scale structures such as dams, high-rise buildings, and flyovers.
When the bar is passed through special cooling beds, the bar’s core gets transformed into a ferrite-pearlite crystal structure. The microstructure of the TMT bar enables the builder to construct with fewer bars when compared to ordinary bars and is thus considered a cost-effective option as well.
Due to the peculiar manufacturing process, the TMT bars have a varied structure with a tougher surface- a martensite layer; the intermediate layer is made of martensite and bainite and the ferrite and pearlite core with higher flexibility.
Another manufacturing process called the water-spray process brings in higher tensile strength for them. The process helps in manufacturing the rods without any surface defects.
What are the critical tests you must carry out to ensure quality?
- Is it ISI certified?:
ISI-certified TMT bars assure quality; thus, preferring ISI-certified TMT bars is essential for a successful construction project. IS: 1786 demands properties of TMT bars to meet their regulations. For instance, IS 1786 demands a Fe 500 grade TMT bar to exhibit a tensile strength of about 550-580, a yield stress of about 500-530, and an Elongation percentage of 12.5-18%. Other than these parameters, they are also evaluated across their weight tolerance, bend test and significant others. Therefore you must choose an ISI-certified TMT bar for your construction project.
- Chemical and physical reports:
Do they provide you with a report saying they have approved chemical and physical tests? The information should contain the approval of qualifying the recommended values regarding the chemical and physical properties of the bars. This further ensures the quality and lifespan of the TMT bars. For instance, the Fe500 bars are expected to meet the following chemical specifications.
Fe500 should contain 0.3% carbon, 0.055% Sulphur, 0.055% phosphorous, and 0.105% sulphur and phosphorous . According to ISI certification, the TMT bars should not contain higher carbon levels than required; only then the TMT bars would exhibit qualities like excellent ductility, higher bendability, higher corrosion resistance and higher weldability. Likewise, the mechanical properties, such as proof stress percentage, elongation percentage, and other factors, should abide by the regulations imposed by ISI standards.
- Look for national certificates:
Look for the national certificates provided by the manufacturers; the certificates include the following:
JIS G3109 & IS 432(MS)
Using the TMT bars with these national certificates ensures that the TMT bars have passed the specifications mentioned in ISI standards and have been manufactured under controlled conditions. It also shows that the rolling and cold working of the bars, heights and length of the longitudinal ribs and deformation and surface characteristics were all considered with strict regulations.
Look for the length, manufacturers license, pitch length and diameter:
The length of an ideal TMT bar should be 12m, and the pitch length between the twists should not be more than 12 times that of the nominal diameter of the bar. Also, the diameter of the bar should be consistent. Checking the manufacturer’s license is essential to ensure that they abide by the national standards in the manufacturing process. If you are unsure of their manufacturing process, check their official website and research their authority in the market.
- Do carbon testing:
Carrying out carbon testing is essential as it imparts ductility, durability and a higher strength-to-weight ratio to the TMT bars. When the TMT bars have a carbon content of less than 0.25%, the bar exhibits a higher ductility, which means the rods can be easily cut to the desired sizes. Also, the right amount of carbon content helps in higher durability, which means it can withstand higher pressure due to earthquakes. Therefore, carrying a carbon test is the best way of testing the bars’ quality, especially when buying them in Bulk.
- Does your manufacturer have a testing facility?
A renowned brand will have a wholesome testing facility in its manufacturing unit. This enables them to test and correct their procedures. A prominent TMT Bar Manufacturer knows to perform quality checks after every production stage. Do you know that Steel is the most recycled metal or substance on the planet? Also, Steel can be recycled and still be used with all its strength yet again! If so, is the manufacturer carrying out recycling procedures to protect the planet? Do they hold on to specific values for themselves and consider them more important than business?
Look for the properties for better performance:
When you carefully analyze the mechanical properties of the TMT bars, you can ensure the highest safety and success for your construction project; therefore, take time to explore the following mechanical properties. You may also make a list out of these and check it once done.
The advanced manufacturing process of TMT bars keeps the core softer and stricter exterior. This varied texture of the bars enables them to bend around the mandrels and be used for sophisticated architecture. Therefore bendability is considered the prime advantage of TMT bars in constructing contemporary designs.
- Dimensional tolerance:
When you are purchasing bundles, you should verify the dimension and weight tolerances of the TMT bars. For instance, if the TMT bars are an 8mm bundle, the weight should be between 44.09 to 50.73 kgs.
- Seismic resistance:
Many of us are bothered about seismic resistance, significantly since the number of earthquakes and natural disasters are rising across the globe. Building firm and substantial buildings have become necessary for enhanced safety. When the TMT bars are manufactured with uniform ductility, they exhibit superior seismic resistance.
Facts you should know to cut down the costs:
- Why is weight significant?
Do you know that the manufactured bars differ in weight? You pay based on the weight of the bars. For instance, if the TMT bars weigh above the tolerance limit, the manufacturer will demand you pay more for the extra weight. However, the dye used on the bars while casting them alters the weight. The dye can potentially increase the weight of TMT bars. Therefore checking the weight of the TMT bars and determining the reason for the weight is essential to cut down costs when you are purchasing TMT bars in Bulk.
Therefore if the manufacturer abides with the IS-1786 standardization, you can be sure that the weight of the bundle is within the purchase range for the tolerance provided. You can also compare the weight measured with the purchase range before purchasing. You should also check the diameter of the bar and compare the factors.
- Reduce manpower by investing in quality TMT bars:
The quality TMT bars will possess higher flexibility. When the TMT bars exhibit higher flexibility, the workers don’t have to put in too much effort or time during construction. The TMT bars can be easily bent for the required sizes and shapes. Thus the flexibility of TMT bars can potentially reduce manpower and consumes lesser hours for construction.
Construction journeys can be pretty challenging and involve a lot of complexity. Taking wise decisions at all times can be overwhelming, and the responsibilities can also be pretty burdening. However, analyzing beforehand, planning and doing research can help you far ahead in the journey. Purchasing reliable materials such as TMT bars saves you a lot during construction and protects the project. The advancement in the manufacturing process of TMT bars has helped the builders construct successful construction projects. Thus, keeping all the information provided in the article in mind helps in saving a lot of money and energy during your construction process.