Homework SourseStructure and Property Modification What is different betwe
Structure and Property Modification : What is different between Hot working and Cold Working?
Solution
9)Very thin sections are not obtained.
10)hot rotting is the father of cold rotting
9)thin sections are obtained
10)cold rotting follows the hot rotting
| HOT ROLLING | COLD ROLLING |
| 1)When the processing temperature of the mechanical deformation of steel is above the recrystallization temperature, the process is termed as hot working | 1) When the processing temperature of the mechanical deformation of steel is below the recrystallization temperature, the process is termed as cold working |
| 2)Metal is fed to the rolls after being heated above the recrytallization temperature. | 2) Metal is fed to the rolls when it is below the recrystallization temperature. |
| 3) rolled metal does not shows work hardening effect. | 3)The metal shows the working hardening effect after being cold rolled. |
| 4)Co-efficient of friction between two rolls and the stock is higher | 4)Co-efficient of friction between two rolls and the stock is comparatively lower. |
| 5)Experiment measurement are difficult to make. | 5)Experiment measurement can be carried out easily in cold rolling. |
| 6)Heavy reduction in area of the work piece can be obtained. | 6)Heavy reduction is not possible. |
| 7)Mechanical properties are improved by breaking cast structure | 7) Hotness increased excessive cold working greatness crackers ductility of metal reduction. |
| 8)Rolls radius is generally larger in size. | 8)Rolls radius is smaller. |
| 9)Very thin sections are not obtained. 10)hot rotting is the father of cold rotting | 9)thin sections are obtained 10)cold rotting follows the hot rotting |
