The difference is as follows:
|Sr. No.||Case Hardening||Surface Hardening|
|1||Case hardening is a process of making hard case over metal by infusion of element over surface forming hard layer||Surface Hardening is a process of increasing hardness of surface keeping the core soft.|
|2||Done by heating to red hot condition, then infusing carbon on surface and then quenching in water bath.||Done by heating the surface at austinizing temperature and core below it and immediate cooling it by quenching.|
|3||Used for low carbon steel like mild steel.||Used for many equipment made of steel.|
|4||Does not required immediate quenching.||Requires immediate quenching.|
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