Can Anyone tell me the right way to apply passive fire paint on a steel structure? I applied the regular way but when torched, no intumescent comes out and surface and surroundings get really hot. What to do?

Since you have said paint, and I don't, what do the instructions on the tin say?

Have you purchased intumescent paint designed for structural steelwork and have you follow the manufacturer's instruction to the letter?

I'm thinking you should be using the services of a competent passive fire protection contractor for this work, you appear not to have the knowledge required - it sounds like you are using standard fire rated paint rather than a structural steel work intumescent coating!