783.2 Hardness Test a. Switch on the power, turn on the tester, light on to turn on the digital display screen. b. Choose the right scale, quantity and conversion value.c. Put the test material on the stage, and rotate the lifting handwheel along the pointer to move up the stage.Attention: Rotate the handwheel lightly and equably to avoid the test material hit the indenter heavily and cause the indenter damaged.d. When the indenter touches the test sample, the figures on the display would increase, and the spline fit on the left would also move. When the circle at the end of the spline fit become solid, the test force finishes loading, and the header would automatic clear.e. Press the start button, then the light off, and the tester would start to load and load dwell time. When the light on again, the result could be read because the test force has been removed.Attention: The first measurement or change indenter, stage, test sample, the first or second measuring result would not be as a reference. And the distance of adjacent indentation center would not be less than 2mm, the distance of any indentation center and the test material margin could not be less than 1mm.f. When finish reading results, rotate the lifting handwheel anti-clockwise to rise down the stage, and the measurement is over.g. If the measuring surface is an cylindrical surface with diameter less than 38mm, the measuring result should be revised, and the actual hardness value is equal to the measuring result plus the correction.
Hardnessvalue (HRB) Diameter of cylindrical surface(mm)6 10 13 16 19 22 25
Correction of Rockwell B scale20304050607080901005.04.03.55.04.03.53.02.55.04.54.03.53.02.52.01.54.54.54.03.53.02.52.01.51.54.0 3.53.03.02.52.01.51.51.03.53.02.52.52.02.01.51.51.03.02.52.52.02.01.51.51.00.5
