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ASTM E 18 REV A Document Information:
Title
Standard Test Methods for Rockwell Hardness of Metallic Materials
ASTM International
Publication Date:
May 15, 2008
Scope:
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.
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
standard.
Keywords:
- hardness
- mechanical test
- metals
- Rockwell
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