37) As per ISO designation for carbide throw-away tool inserts, 'C' is representation of basic shape
Rhomboidal with 80 degree angle
Elasticity
Elasticity:
Whenever an external force is applied on a metal, it deforms. Elasticity is the property by virtue of which a metal regains its original shape when the external force applied on it is removed.
es: forming, forging, hammering
Plasticity:
Plasticity is the property by which a metal retains its deformation permanently, when the external force applied on it is removed.
Examples: forming, forging, hammering
Stiffness:
When an external force is applied on a metal, it develops an internal resistance. The internal resistance developed per unit area is called stress. Stiffness is the ability of a metal to resist deformation under stress.
Toughness:
When a huge external force is applied on a metal, the metal will experience fracture. Toughness is the ability of a metal to resist fracture. The ability of a material to resist fracture due to high impact loads, is called toughness.
Due to refractory coating over tuyeres
![In a forge, why does not tuyeres melt down due to heat?](https://mcqfinder.in/uploads/images/question-papers/isro-technician-b-turner-2017-set-1/isro-technician-b-turner-2017-set-1-id-40-e.jpg)