Sample

Treatment

Case Hardness (HRA)

Core Hardness (HRA)

A

870˚C for 60 mins.oil quench

57.2

52

B

870˚C for 120 mins.oil quench

60.4

54.2

C

800˚C for 60 mins.oil quench

54

51

D

800˚C for 120 mins.oil quench

56

51.5

E

Untreated

50

50