🔹Mild Steel Bar -
The mild steel bars are smooth and round in shape having diameter ranges from 6mm to 50mm used for small scale construction works.
Mild steel is also known as low carbon steel having 0.1% to 0.25% of carbon. But mild steel is not considered as an alloy steel though it doesn't contain other elements in it compared to different steel varieties. As carbon content increases, ultimate strength and hardness will increase but ductility and toughness decreases. Though mild steel contain very less carbon, it is ductile and weldable but having low stength. Also mild steel is highly prone to corrosion.
🔹High Yield Strength Deformed Bars (HYSD)
High yield strength deformed bars (HYSD) are manufactured under heat treatment followed by either heat rolling or cold twisting for shaping.
HYSD bars moderately resistant to corrosion and the manufacturing process itself cause surface flaws in it.
It is heavy weighted and its transportation cost is high. Residual stress is high and tensile stress is low in HYSD bars that cause deformation. Although the bond strength of HYSD bars remains the same as that for MS, it's tensile/compressive strength is more. In HYSD torsional stress occurs during bending that causes surface defects.
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