Types of Steel Reinforcement

1. High Yield Strength Deformed Bars (HYSD) HYSD bars are commonly used for RCC works. They are characterized by the ribs present on their surface. The ribs are formed when the hot steel is rolled through the mill. The bond strength of these bars is 40-60% higher than the mild steel bars of the same size.
2. Mild Steel bars are plain bars. They have lesser yield and ultimate strength than the HYSD bars. The absence of ribs on the surface causes a weaker bond with the concrete.
3. Prestressing Bars are made of few cold worked wires. It is also called tendons. A tendon is typically made up of 2, 3, or 7 wires. The tendons are easier to lay in any desired profile and have high ultimate tensile strength.
4. The term TMT Bar stands for Thermo-Mechanically Treated Bar. These bars are manufactured by passing the hot rolled bar through cold water. The passing of the hot bar through cold water hardens the but the core remains soft. The hard surface provides better durability while the soft core provides tensile strength.