![]() These bars do not show a definite yield point. It increases the bond between concrete and steel. There is corrugation on the surface of the twisted deformed bar. Deformed bars are represented by symbol #.Ī twisted deformed bar has nearly 50% higher yield stress than plain bars. The (b) form of steel is also known as CTD bars or Tor steel and are available in two grades. Their strength is higher than that of mild steel, but the yield point is not clearly defined. It has a higher percentage of carbon as compared to mild steel. įig: Typical stress strain curves for various types of steel High yield deformed bars Mild steel plain bars are denoted by symbol. In columns, they are used as lateral ties and at places where nominal reinforcement is required. The modulus of elasticity of mild steel is taken as equal to 2 x 10 5 N/mm 2. Mild steel bars are ductile, they are not preferred over high yield strength deformed bars because it has less strength and weak bond. The stress-strain curve for mild steel is given in the figure. Mild steel bars also are known as Fe 250 because the yield strength of this steel is 250 N/mm2. Let us describe different types of steel bars used in construction one by one. IS 226 – 1975 5 Thermo-mechanically treated bars (TMT)Corrosion resistant steel (CRS) bars Latest in use deformed bars Types of Reinforcement Sub-type Relevant Indian standard 1 Mild steel plain bar Cold worked mild steel barsHot rolled mild steel bars IS 432-1996 (part –I) Is 1139-1966 ( part-II) 2 High yield strength deformed bar ( Tor steel) Cold worked deformed barsGrade Fe 415Grade 500Hot rolled deformed bars IS 1786 – 1979 IS 1139 – 1996 (part – II) 3 Hard drawn steel wire fabric Wire mesh IS 1566 – 1967 4 Rolled steel members Angles, T- sections joists, channels, etc. Types of steel bars used in construction S.No. The reinforcement bar should develop a perfect bond with the concrete to transfer stresses from one material to another. ![]()
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