Civil Engineering - Building Materials - Discussion

DBT means ductile to brittle transition.

Phosphorus causes a DBT when the temp drops below some critical temp (which is known as cold brittleness or shortness because brittleness is caused due to lowering of temperature).

Sulphur causes a DBT when the temp rises above some critical temp (which is known as hot shortness because brittleness is caused at high temp).

Cold brittleness needs to be avoided because otherwise, steel will become brittle in winters.

Hot shortness doesn't affect much because steel will be brittle at a very high temperature and steel products will generally be at room temp.

Only carbon content is responsible for Ductility or brittleness of a material!

Phosphorus has no influence on mechanical properties.

Carbon causes the Brittleness then why answer is phosphorous? Anyone explain the exact answer.

Excess silica makes the brick brittle and weak on burning.

Thank you @Ashok.

Thank you and Agree with you @Ashok.

Thanks @Ashok Kumar.

Carbon is correct.

As a percentage of sulfur increases then the strength of material increases (in rubber to make different materials having different elasticity eg. Tyre, rubber, plastic chairs, belts,) sulfur used.

It is defect of steel caused by the phosphorus.