Hardness Testing Equipment
Engineering Metals and Materials Table of Contents
Brinell Hardness Testing - In this test a standard constant load, usually 500 to 3,000 kg,
is applied to a smooth flat metal surface by a hardened steel-ball type
indenter, 10 mm in diameter. The 500-kg load is usually used for testing
nonferrous metals such as copper and aluminum alloys, whereas the 3,000-kg load
is most often used for testing harder metals such as steels and cast irons. The
numerical value of Brinell Hardness (HB), is equal to the load, divided by the
surface area of the resulting spherical impression.
Where P is the load, in kg; D is the diameter of
the ball, in mm; and d is the diameter of the indentation, in mm.