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Mild Steel is not hard and brittle. Once Mild Steel is subjected to heating and then allowed to cool, it forms different compounds of steel having different properties.

This depends upon

1. The heating temperature

2. The time allowed for cooling.

When MS is heated to high temperatures so that it appears red hot and then suddenly cooled down to ambient temperature, it forms a compound called Martensite, which is hard. This is because there is more carbon in Martensite then in Mild Steel. This process of altering properties of compounds by heat is called heat treatment.

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Q: Does mild steel become harder when heated?
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What temperature does mild steel need to be heated for thermal cutting to occur?

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