Question

Write a note on heat resistant steel 

Answer 1

These are steels which are exposed to high temperatures during proportion of equipment. Heat resistance is obtained by adding specific metals in appropriate proportion.
Following metals are used/added in stainless steel in order to make them heat resisting.
Molybdenum: 3.5% addition of this metal improves heat resistance of steel. 

Chromium: though this is the component in steel, but it is added more than 12%, it imports high grade heat resistance to steel. Such a steel is called as ‘nichrome’.
Uses:
For making equipment facing high temperature i.e. gas turbines, retorting, parts of boilers, steam – linings, aero engine valves, etc.