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Frequently Ask Question

Question No. 1: What is REBAR?

Answer: Rebar (short for reinforcing bar), also known as reinforcing steel, reinforcement steel[1] and colloquially in Australia as reo, is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and hold the concrete in tension. Rebar's surface is often patterned to form a better bond with the concrete.

Question No. 2: What is Billet?

Answer: A billet is a length of metal that has a round or square cross-section, with an area less than 36 in2 (230 cm2). Billets are created directly via continuous casting or extrusion or indirectly via hot rolling an ingot or bloom. Billets are further processed via profile rolling and drawing. Final products include bar stock and wire. Centrifugal casting is also used to produce short circular tubes as billets, usually to achieve a precise metallurgical structure. They are commonly used as cylinder sleeves where the inner and outer diameters are ground and machined to length. Because their size is not modified significantly, they are not always classified as semi-finished casting products. In Steel production, a billet is a 12 meter long with cross sectional dimension varies from 50mm x 50mm 150mm x 150mm size. Anything above 150mm x 150mm cross dimension consider to be bloom or slab.

Question No. 4: What is the meaning of TMT steel bar?

Answer: Thermo mechanically treated steel also known as TMT steel 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.
To produce TMT steel bar 3T’s must need to achieve : Temperature: Ensured 1000˚C before Quenching Box.
Time: High Speed Rolling.
Technology: MSW has the capacity to maintain:
1. Water Pressure up to 10 BAR
2. Water pH value within 7-8
3. 72 Meter long cooling Bed
Loop Scanner of SCADA automation make rolling operation more precise.
Anything above is not consider as a TMT steel bar.

Question No. 5: What Should I Know About Rebar ?

Answer: The amount of rebar used in typical structures is a small percentage of the amount of concrete. Most beams, for example, use about 1% rebar for carrying the tension forces in bending. Columns may use up to 6% rebar, partly because the rebar carries both tension and axial forces. Since rebar costs much more than concrete, efficient engineering design minimizes rebar use. Rebar is central to reinforced concrete, so a basic understanding helps. The various sizes are important to know: a #3 bar is 3/8” in diameter, a #7 bar is 7/8” in diameter, etc. The easy rule of thumb for rebar sizes is to take the rebar size and divide by 8 for the diameter in inches. Rebar Diameter Weight/ft :
#2 2/8"or 0.25" 0.167 lbs
#3 3/8" or 0.375" 0.376
#4 4/8" or 0.5" 0.668
#5 5/8" or 0.625" 1.043
#6 6/8" or 0.75" 1.502
#7 7/8" or 0.875" 2.044
#8 8/8" or 1.0" 2.67
#9 9/8" or 1.125" 3.4
#10 10/8" or 1.25" 4.303
#11 11/8" or 1.375" 5.313
#14 14/8" or 1.75" 7.65
#18 18/8" or 2.25" 13.6
As noted above, the structural element needs rebar to carry the tension in the reinforced concrete. So a footing needs rebar on the bottom, a simple beam or slab needs rebar on the bottom, etc. Rebar is also commonly used to help control concrete shrinkage. As concrete cures over time, it continues to shrink. Most of the shrinkage happens in the first few hours, then less shrinkage in the first few days. The shrinkage continues forever, but the amount of change becomes smaller and smaller. In addition to the shrinkage due to curing, concrete will both expand or contract as a reaction to temperature changes (as do all materials, to some extent). Therefore, additional rebar is often used in a structural element and is called “Temperature Steel”. This rebar helps control concrete cracking due to shrinkage cracks from curing or from temperature changes. It’s common to see ‪#‎4s‬ at 12” on center, ‪#‎3s‬ at 12” on center or even #3s at 18” on center as temperature steel. A Construction Supervisor should be able to look at the drawings for the reinforced concrete members and have an understanding of which rebar is structural and which is temperature steel. Many times field decisions are made regarding pipes and ducts passing through structural elements, which interfere with the stipulated amount of rebar. Though these decisions should ideally be made by the Structural Engineer, the Construction Supervisor needs to understand enough of the structure to know when to ask. The simple precept, “When in doubt, always ask the Structural Engineer” is easy to say but not particularly practical when a Construction Supervisor makes hundreds of decisions a day. The wise Construction Supervisor understands the whys and hows of rebar use. In order for reinforcing bars to be in the required location in reinforced concrete, the bars must often be fabricated to special shapes. Typically a steel detailer draws a Shop Drawing that takes the schematic information from the structural drawing and shows the actual bar lengths, bends, clearances, etc. to actually fabricate and install the bars. These Shop Drawings should be carefully reviewed by the Construction Supervisor to check for fit, conflicts and errors. As soon as one begins reviewing reinforcing steel shop drawings, questions with imbedment and bar splice will arise. Reinforced concrete structures are usually cast in individual segments but the entire structure must act as a single unit. Construction joints create a location to stop the concrete pour, but often it is essential for the stresses in the reinforcing steel to carry through the construction joint. In this case the reinforcing bars continue through the construction joint and spice with bars on the other side. Using too long a splice in uneconomical, because steel costs much more than concrete. Minimum bar splices should be described in the structural drawings and actual splices shown in the reinforcing steel shop drawings. In the recent past it was common for structural drawings to state a 40 diameter bar lap for all splices. Experience showed that simple solution to be overly conservative in some case and to cause failure in other cases. Therefore, a significantly more complicated set of rules were adapted for bar splicing. It is important for the Construction Supervisor to at least understand the terminology of the American Concrete Institute (ACI) rules for rebar splicing. Another helpful fact for rebar concerns the markings required to be on each bar. The Construction Supervisor should understand the markings, thus able to pick up a piece of rebar and know its producing mill, bar size and type and grade of steel. The figure below shows where those markings are found on rebar.

Question No. 6: Why MSW Steel? ?

Answer: Reasons for Choosing MSW Steel:

  • Proven Production Capacity.
  • Proximity to Markets.
  • Modern Infrastructure.
  • Quality Products.
  • Competitive Pricing.
  • Experienced & Skilled Workforce.
  • Latest Technologies.
  • Continued Investments.