Someone is joking with you!
No. That someone would not be joking with you, instead that someone would simply happen to be an Australian, and he would be talking about the Sydney Harbour Bridge. The Australians, who are very fond of nicknames, affectionately call the Sydney Harbour Bridge as ‘Coathanger’ because of its structural shape.

Not only is it the world’s largest single span steel arch bridge, but also a global award winning engineering landmark. It is an architectural marvel! The bridge is actually built in Port Jackson, where the waters of Sydney Harbour, Middle harbor, North harbor, and the Lane Cove and Parramatta rivers meet. It is a natural harbor for inlet of Tasman Sea, part of the South Pacific Ocean.

The story behind the construction of the bridge is very interesting. It took Australian government over 100 years to finally approve the construction, due to various reasons including World War I.

There were plans to build a bridge as early as 1815, when noted architect Francis Greenway proposed that a bridge be built from the northern to the southern shore of the harbour. In a letter to “The Australian” newspaper he said that a bridge would give an idea of strength and magnificence that would reflect credit and glory to the country.

In 1840, naval architect Robert Brindley proposed a floating bridge. A suggestion for a truss bridge was made in 1879, and in 1880 a high-level bridge estimated at $850,000 was proposed. In 1900, local engineer Norman Selfe submitted a design for a suspension bridge.

Originally the plan that was approved for the bridge was a steel cantilever bridge, but after a lot of discussion and debate, and with the advancement of technology over the years, it was decided that steel bridge would be much stronger, cheaper and more reliable. Because the architectural masterminds in particular and the world in general, had come to realize that, steel as an alloy had emerged as the strongest metal

So, the construction of the Sydney Harbour Bridge as a steel through arch bridge started in 1923 with John Bradfield, Ralph Freeman and Thomas S. Tait as the architects, and was completed in 1932 after 9 years. The materials used are steel, granite and concrete.

It has 2 rail tracks, 8 road lanes, 1 pedestrian way and 1 cycle way.

• Width – 161 ft.
• Length – 3770 ft.
• Height – 440 ft.
• Clearance below, between the water and the deck – 161 ft.

The total weight of the bridge itself is 52800 tons and it cost 13.5 million AU dollars. Now can you guess the total steel used in it?

The steel in the bridge will total 50,200 tons… and to produce that much steel, 80,000 tons of iron ore, 15,000 tons of limestone, 3,700 tons of dolomite, and about 180,000 tons of coal is required. That is where the inner strength of the Sydney Harbour Bridge comes from.

These specifications required in the production of steel can be verified at Sunvik’s steel plant at Sira Taluk in Tumkur District of Karnataka. Sunvik rolls on a maximum efficient and eco-friendly plant. I have personally visited the plant and watched all of their processes, the best thing about their plant it that, it is a zero solid waste disposal unit, the only plant in the whole of South India. Their commitment to the cause and their own personal inner strength in dealing with maintaining the quality of the product matches the inner strength of the steel they produce.

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Why are they important: TMT bars are very important because they are the back bone on which the construction stands. They are the spine and life of the structure

In the modern technological era, TMT Bar is manufactured using Thermex Technology, also known as TMX. Due to its high tensile strength, Thermex Technology TMT Bar is a high-quality TMT bar that can be used in all types of construction.

Production of desirable high-strength bars that satisfy all criteria for civil construction, including high yield strength, toughness, high elongation value, ductility, weldability, and outstanding bond characteristics, has been made possible by Thermax thermo-processing treatment. The Thermax technique employs a proprietary system to impart a quick, intense, yet extremely precise in-line cooling of the rolled bar.

A cooled, hardened output is the result of this process. When the bar is further cooled in the atmosphere, a thermal exchange (Thermax) takes place between the inside and cooled outside martensite surface. This results in a distinct tempered martensite structure at the bar’s perimeter and a fine-grained ferrite—pearlite structure at the centre.

ADVANTAGES OF Thermex Mechanically Treated BARS

• Superior ductility, weldability, better elongation
• Amazing flexibilty
• Outstanding malleability.
• High yield strength and toughness.
• Superb bonding strength.
• Tremendous corrosion resistance.
• Excellent earthquake and fire resistance.
• High thermal resistance.
• Cost effective, Economical and safe to use.
• No loss in strength at welded joints.
• Easy to transport and store
• Recycling of TMT bars makes them cost effective and lowers the impact on the environment without compromising on quality

There are many manufacturers of TMT bars in India. Sunvik Steels are very aware of the pollution and carbon footprints released into the atmosphere. They have a world class facility for manufacturing TMT bars. Their unit is very eco-friendly and comprises of self generation of electricity, recycling and extensive re-cycling of waste products. Sunvik has also been honoured as the “Most Trusted Eco-friendly Green TMT” at ET Achievers Award. They are committed to quality and customer satisfaction which is why their products are much in demand.

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TMT  bars are made of steel which is an alloy of iron ore and carbon. It is imperative that the raw material used is processed with the best technology to provide best is class TMT Bars.

Steel strength, ductability, flexibility, malleability are some properties of steel which have to be refined and enhanced during the manufacturing process

Here are a few pointers of the 5 step manufacturing process of TMT Steel bar

Step 1 – Extraction of iron from the original ore.

The extracted iron is kept in a molten state and then treated and converted into steel billets

Step 2 – Heating, Rolling and formation of reinforced bar:

The steel billets are made by heating to very high degrees and are rolled to reshape the billets into the final size and shape of the reinforced bar before passing through a rolling mill stand.

Step 3 – Quenching:

After leaving the final rolling mill, the hot re-inforced bar is instantly quenched. Quenching means to cool at extremely low temperatures. This difference in temperatures toughens the outer layer of the bar. the surface of the quenched bar becomes cold and hardened whereas the core still remains hot.

Step 4 – Self- tempering:

A temperature gradient is formed across the cross-section of the quenched bar after leaving the quenching box. As an outcome heat flows from the core at a relatively higher temperature to the outer surface.This causes the correct tempering of the outer layer into a structure known Tempered Martensite and the formation of an intermediate ring of Martensite and Bainite. The core still stays in the austenitic state at this stage

Step 5 – Atmospheric Cooling:

The bars are subjected to atmospheric cooling to equalize the temperature difference between the soft inner core and the hardened exterior after the self-tempering process. When the bars are completely cooled down, the austenitic core gets transformed into a ductile ferrite- pearlite structure.

Following the above steps to precision and perfection produce the best quality TMT bars

Which have the desired tensile strength, malleability, ductability and  high elongation as required in the construction of building.

Sunvik Steels have an upgraded and world class facility operated with the most superior technology to manufacture the best in class TMT bars. Sunvik Steels are also aware of the negative impact the steel industry has on the environment. They minimise the impact by generating their own electricity, and efficient waste management by manufacturing by products from the waste generated(material tree.com)

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