What does TMT stand for?
Thermo mechanically treated steel bars known as TMT steel bars can be described as a new-generation-high-strength steel having superior properties such as weldability, strength, ductility and bendability meeting highest quality standards at international level. Under thermo mechanical treatment of bars, the steel bars are made to pass through a specially designed water cooling system where these are kept for such a period that outer surface of bars becomes colder while the core remains hot. This creates a temperature gradient in the bars. When the bars are taken out of the cooling system, the heat flows from the core to the outer surface causing further tempering of steel bars thereby helping them in attaining higher yield strength of steel.
What are the Advantages of TMT steel bars?
More strength and ductility
The high strength of the bars make them an ideal material to be used with concrete for making structures more robust. The unique ribbed pattern on the TMT bars also provides extra strength by bonding them more tightly with concrete. The ductility of the TMT bars makes them easier to work with, and pre-welded meshes can be made off-site reducing the overall construction time.
The TMT manufacturing process imparts anti-rust properties to the bars. Coarse carbides, which are the main culprits for corrosion in steel, are stopped from building up during the water-cooling phase making the structures made from TMT steel more durable.
Due to its high thermal stability, TMT bars can withstand temperatures ranging from 400 to 600 degree Celsius; this ensures the building’s structural integrity even during a fire.
The soft core of the TMT bars imparts a high level of ductility – giving the structures made with TMT more leeway to manage dynamic and seismic loading.
What does TMX stand for?
TMX is an acronym for THERMEX. THERMEX is the brand name referring to the Quenching & Self-tempering process. All TMX steel rebars are TMT rebars, but all TMT rebars are not THERMEX/TMX rebars. Only those TMT bars manufactured using the licensed QST technology are TMX or THERMEX rebars. The structural uniformity is the highlight feature of TMX Bars.THERMEX process converts the bar surface to a hardened structure. The subsequent phase involves cooling at ambient temperature to allow the hot core to temper the surface through the Thermex exchange. This results in a unique structure of tempered martensite periphery and fine-grained ferrite-pearlite at the core. This structure should be uniform throughout the cross-section of rebars.
What are the Advantages of TMX steel bars?
TMX Bars have superior weldability which helps the architects and designers to build innovative and creative structures without affecting the quality of construction.
High Seismic Resistance
THERMEX Quenching & Self Tempering (QST) Technology and state of the art manufacturing process ensures a minimum elongation of 18-20% for TMX steel bars, which is 50% more than the basic BIS requisite. This extra elongation turns out to be extra beneficial for “ductility properties” in seismic-resistant structural design.
TMX Bars have a great degree of elasticity. The soft ferrite-pearlite core of the TMX bars gives them superior bendability. These bars can be easily bent and molded into any shape. All the TMX bars undergo “bend test” and “re-bend test” as per the BIS Norms.
Higher Fatigue Strength
TMX Steel Bars are highly ductile and have a super-strong surface layer. These properties help in withstanding fatigue for a longer period. Fatigue strength is the highest stress that a material can withstand for a given number of cycles without breaking. Fatigue strength is affected by environmental factors, such as corrosion. The enhanced elongation translates into greater ductility, which gives the resultant structure improved resistance during earthquakes and other natural calamities.