Objective:

To find the Rockwell hardness number of Mild Steel, Cast Iron, Brass, Aluminium and Spring Steel etc.

Apparatus used:

Rockwell hardness testing machine

 Select a specimen of your choice ( Cast Iron, Mild Steel, Spring Steel, Brass and Aluminium ).

Select material

Selected material :

Cast Iron

Mild Steel

Spring
 Steel

Brass

Aluminium

Type of indentor to be used :

 The hand wheel is turned until the specimen is in contact with the indenter and the pointer of the smaller dial gauge reaches the RED DOT so that minor load of 10kg is applied.

Minor load of 10kg
is applied

 Based on the material the major load is set & the motor is switched ON. The hand lever is kept in load position. The reading is noted down using B-scale or C-scale based on indentor used.

Major load applied =

Click on the hand lever
to unload

  Two trials is noted for all the four specimens and the average of the two trials gives the final Rockwell Hardness number.

Average Rockwell Hardness number =