Case hardening increases hardness on the surface of the mild steel, while maintaining its internal properties. Since the carbon content determines a workpiece's hardness, case hardening increases the carbon content of its surface. There are two types of case hardening: case hardening in an industrial setting and case hardening in a school workshop.
In an industrial setting, mild steel is first heated to high temperature (usually by flame), then cooled rapidly (using water). In a school workshop, steel is heated, then dipped into a carbon compound to increase the carbon content on its surface. Then, the steel is reheated, and plunged into cold water.
On the other hand, hardening and tempering increases toughness and reduces brittleness. The workpiece is first heated to red heat, then immediately plunged into cold water to increase toughness of the metal. This process is called hardening. After hardening, the workpiece is heated to blue heat, and rested to cool slowly. This process is called tempering, and it removes excess hardness and brittleness, while retaining its strength.
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Case hardening increases hardness on the surface of the mild steel, while maintaining its internal properties. Since the carbon content determines a workpiece's hardness, case hardening increases the carbon content of its surface. There are two types of case hardening: case hardening in an industrial setting and case hardening in a school workshop.
In an industrial setting, mild steel is first heated to high temperature (usually by flame), then cooled rapidly (using water). In a school workshop, steel is heated, then dipped into a carbon compound to increase the carbon content on its surface. Then, the steel is reheated, and plunged into cold water.
On the other hand, hardening and tempering increases toughness and reduces brittleness. The workpiece is first heated to red heat, then immediately plunged into cold water to increase toughness of the metal. This process is called hardening. After hardening, the workpiece is heated to blue heat, and rested to cool slowly. This process is called tempering, and it removes excess hardness and brittleness, while retaining its strength.
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