What is the difference between mild steel and HYSD bars?

Mild Steel is general purpose steel grade, basically used for remelting, alloying and maufacturing of fabrication of various structures.
The Steel generally made of low Carbon and Silicon.
The yield strenght values are very low for Mild Steel, as the name suggest.
Therefore it is not used for special purpose of reincforcing and heavy strcuture manufcaturing.
Where as, HYSD is High Yield Strength Deformed Bars have ribs on the surface and this increases the bond strength at least by40%. 
These are made of different grades and types.

Mild Steel:It is the most common form of steel.It is not brittle.It is cheap.It is often used when large amounts of steel are needed.
Mild steel is a carbon steel typically with a maximum of0.25% Carbon and0.4%-0.7% manganese,0.1%-0.5% Silicon and some + traces of other elements such as phosphorous.
HYSD Bar: Tor steel is HYSD.
ie High Yield Strength Deformed bar.
As the name implies it has comparively high strength than Mild Steel.
They are graded as Fe415, Fe500 ie fy of415 and500 N/sqmm respectively.

Mild steels is best for reinforcing the existing TMT bars, mild steel are weaker, low tensile strength, can easily crack when bent and is generally not used in construction nowadays.

 

This difference comes from the amount of carbon in the two bars. HYSD is a specialist construction bars, they come in different grades such as FE415,FE500, FE550 and FE600.

Mild steel is made of low carbon and iron, with much more of iron than carbon.
it is weldable, very hard and, although it easily rusts, very durable.
Containing a maximum of0.29% carbon.Mild is the most commonly used construction materials and it is known as mild because of the relatively low carbon content.
HYSD is High Yield Strength Deformed bar

Mild steel contains low Carbon content whereas HYSD is High Yield Strength Deformed bars contains more carbon content.
Mild steel strength is low but ductile (easy to shape) and more weldable.
HYSD is used where tensile strength requirements are high.
HYSD is more brittle depending on the carbon content.

Mild steel is made of low carbon and it is malleable easy for change form but HYSD contains more carbon giv it more strength then mild steel

mild steel is just common steel with low carbon generally used for fabrication thence hysd bars are high carbon steel formed through heating and cooling so they mostly recommended for reinforcement and structural works

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Mild steel, also called plain-carbon steel, is the most common form of steel ... Mild steel has a relatively low tensile strength, but it is cheap and malleable;

HYSD is used where tensile strength requirements are high. HYSD is more brittle depending on the carbon content.