ASTM A833-84(1996)
(Practice)Standard Practice for Indentation Hardness of Metallic Materials by Comparison Hardness Testers
Standard Practice for Indentation Hardness of Metallic Materials by Comparison Hardness Testers
SCOPE
1.1 This practice covers the determination of indentation hardness of metallic materials using comparison hardness testers.
1.2 This practice applies only to those comparison hardness testers, normally portable, that use standardized test blocks in accordance with Test Method E10 as a basis for comparison.
1.3 Calibration of comparative test bars (rods), used for comparison to determine hardness numbers, is also covered by this practice.
1.4 The indenting force used during comparison hardness testing is normally an impact load applied by striking a hammer at the appropriate areas as outlined in the manufacturer's instructions. Final indentation diameter in both the comparative test bar and material tested shall be within the range of the comparator used for the instrument.
1.5 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all the safety problems associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A 833 – 84 (Reapproved 1996) An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Indentation Hardness of Metallic Materials by Comparison
Hardness Testers
This standard is issued under the fixed designation A 833; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope hammer. This apparatus is designed to allow a ball impression
to be produced on the standard rod simultaneously with one
1.1 This practice covers the determination of indentation
produced on the piece to be tested. Calibration tables (slide
hardness of metallic materials using comparison hardness
rule) are used to compare impression diameters and the
testers.
hardness of the calibration bar to determine the hardness of the
1.2 This practice applies only to those comparison hardness
piece.
testers, normally portable, that use standardized test blocks in
3.1.2 This apparatus is designed with a surface directly
accordance with Test Method E 10 as a basis for comparison.
above the Brinell ball where impact is to occur. The apparatus
1.3 Calibration of comparative test bars (rods), used for
may also be designed to include an extension for stabilization.
comparison to determine hardness numbers, is also covered by
3.2 Measuring Microscope—The divisions of the microme-
this practice.
ter scale on the microscope, or other measuring devices used
1.4 The indenting force used during comparison hardness
for the measurement of the diameter of the impression, shall
testing is normally an impact load applied by striking a
permit the direct measuring of the diameter to 0.1 mm and the
hammer at the appropriate areas as outlined in the manufac-
estimation of the diameter to 0.02 mm. This requirement
turer’s instructions. Final indentation diameter in both the
applies to the construction of the microscope only and is not a
comparative test bar and material tested shall be within the
requirement for measurement of the impression.
range of the comparator used for the instrument.
1.5 This standard does not purport to address all of the
4. Test Parts
safety problems, if any, associated with its use. It is the
4.1 Parts tested by this hardness testing practice vary greatly
responsibility of the user of this standard to establish appro-
in form since it is frequently desirable to make the impression
priate safety and health practices and determine the applica-
upon a part to be used in the finished product rather than upon
bility of regulatory limitations prior to use.
a sample test specimen.
4.1.1 Dimensions—The thickness of the tested part shall be
2. Referenced Documents
such that no bulge or other marking showing the effect of the
2.1 ASTM Standards:
load appears on the side of the piece opposite the impression.
A 370 Test Methods and Definitions for Mechanical Testing
2 In any event, the thickness of the part shall be at least ten times
of Steel Products
the depth of the indentation. The minimum width shall be at
E 10 Test Method for Brinell Hardness of Metallic Materi-
3 least two and one half times the diameter of the indentation.
als
4.1.2 Finish—When necessary, the surface on which the
3. Apparatus
impression is to be made shall be filed, ground, machined, or
polished with abrasive material so that the edge of the
3.1 Comparison hardness testers are used principally for
impression shall be defined clearly enough to permit the
testing articles that are too large or unwieldy to be tested in the
measurement of the diameter to the specified accuracy. Take
usual types of testing machines, for testing parts of fixed
care to avoid overheating or cold working the surface. Suffi-
structures, or for testing under any conditions that require that
cient metal shall be removed to eliminate decarburized metal.
the indenting force be applied in a direction other than vertical.
4.2 Support—All parts to be tested shall be adequately
3.1.1 Required equipment includes an apparatus that con-
supported to prevent any movement or deflection durin
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