Page 39 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

1 Depth of indentation under preliminary load (10 kg)
2 Increase in depth of indentation under additional load (140 kg)
3 Permanent increase of depth of indentation under preliminary load after removal of
additional load, the increase being expressed in units of 0002 mm
4 Rockwell hardness HRC = 100—e

Rockwell Hardness Testing Schematic

Brale is Wilson’s trademark for a diamond penetrator with a conical shape, an included angle of 120 °, and a
spherical tip with a radius of 0.200 mm, all in accordance with ASTM E 18.
Hardness data reporting

Sample No:/part No:
Material:

Material Condition : As received/ Heat treated

Indentation type:
Major load :

Rough sketch of hardness location:
Hardness Value

1
2

3
Average value

24

CITS : C G & M - Fitter - Exercise 61