Heat treating and inspection of metals Page: 37
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HEAT TREATING AND INSPECTION OF METALS
41. Brinell hardness test.-a. This test consists of pressing a
hardened steel ball into a flat surface of the metal being tested by the
application of a known pressure. The impression made by the ball
is measured by means of a microscope with a micrometer eyepiece,
and the Brinell "number" is obtained by dividing the load in kilograms
by the area of the spherical impression made by the ball, measured in
square millimeters. The thickness of all samples used for testing
must be sufficient to prevent bulging on the under side.
b. The Brinell tester (fig. 5) consists of the following major parts:
1. Gage indicating applied pressure.
2. Hydraulic actuating unit.
3. Lever for applying pressure.
4. Hardened steel ball.
5. Elevating screw.
7. Calibrated microscope.
(1) An elevating screw and anvil for bringing the sample into
contact with the ball.
(2) A manually operated hydraulic pump for applying the pres-
sure to the hardened steel ball, which is mounted on its actuating
(3) A pressure gage for determining the applied pressure.
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United States. War Department. Heat treating and inspection of metals, book, September 10, 1941; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc96657/m1/39/: accessed April 30, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.