|Description / Abstract
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|These test methods cover the determination of the Rockwell
hardness and the Rockwell superficial hardness of metallic
materials by the Rockwell indentation hardness principle. This
standard provides the requirements for Rockwell hardness machines
and the procedures for performing Rockwell hardness tests.
This standard includes additional requirements in annexes:
This standard includes nonmandatory information in appendixes
which relates to the Rockwell hardness test.
Units—At the time the Rockwell hardness test was
developed, the force levels were specified in units of
kilograms-force (kgf) and the indenter ball diameters were
specified in units of inches (in.). This standard specifies the
units of force and length in the International System of Units
(SI); that is, force in Newtons (N) and length in millimeters (mm).
However, because of the historical precedent and continued common
usage, force values in kgf units and ball diameters in inch units
are provided for information and much of the discussion in this
standard refers to these units.
The test principles, testing procedures, and verification
procedures are essentially identical for both the Rockwell and
Rockwell superficial hardness tests. The significant differences
between the two tests are that the test forces are smaller for the
Rockwell superficial test than for the Rockwell test. The same type
and size indenters may be used for either test, depending on the
scale being employed. Accordingly, throughout this standard, the
term Rockwell will imply both Rockwell and Rockwell superficial
unless stated otherwise.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
*A Summary of Changes section appears at the end of this
|Additional Supplemental Documents