Manganese steel is used for making railway tr | vedclass

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Question

Railway lines also known as permanent paths are made of steel which has crack resistant properties. Modern tracks typically use hot-rolled steel. We k

Vedclass · Accepted Answer

it is hard with high percentage of $Mn$

Vedclass · Answer

Railway lines also known as permanent paths are made of steel which has crack resistant properties. Modern tracks typically use hot-rolled steel. We know that iron and steel is used in many industries of the present-day world. But the steel used for railway lines cannot be like that. It must be made of very high-quality steel alloy. The alloy selected for railway line construction is selected as such that it would have hard-wearing capacity and must be resistant to cracking.

For this the composition of steel to be used is carefully selected and the process of cooling the hot rail is carried out in a controlled manner.

Mixing of manganese metal with iron produces steel of desired quality. It converts iron into st6ell. As it decreases the brittleness of steel, the mixing of manganese gives strength to the metal. Along with that heat treatments have been developed to control the cooling rate and the microstructure of steel which in turn adds up to the hardness and strength of the steel. Also accelerated cooling increases the hardness of the material.

Therefore, manganese mixed steel produces hard wear-resistant steel which is the best for railway lines.

So, the correct answer is Option $A.$

Manganese steel is used for making railway tracks because

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