7) In a case hardening process, ammonia gas is produced on steel; the process is known as

Cyaniding

Nitriding

Carburizing

Ammonising

Answer is:

Nitriding

Hardening

Case Hardening

Tempering

Normalizing

Answer is:

Explanation:

List of case hardening or surface hardening methods are
Carburising
Cyaniding
Nitriding
Induction hardening
Flame hardening

To induce internal stresses

To build up hardening structure

To fall off the scale

To retain it to its original structure

Answer is:

Explanation:

After heating up to required hardening temperature, tool steels be quenched to build up hardening structure.

The punch is heated for too long

The punch is heated too little

The punch is quenched too slowly

The punch is quenched suddenly

Answer is:

To produce certain desired properties

To make good appearance on the component

To increase strength of the metal

To make the metal rust-proof

Answer is: