ASTM A833-08a
(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
SIGNIFICANCE AND USE
The comparative hardness test is an empirical dynamic indentation hardness test. Comparative hardness tests provide useful information about metallic materials. This information may correlate to tensile strength, wear resistance, ductility, heat treatment condition, or other physical characteristics of metallic materials, and may be useful in quality control and selection of materials.
Comparative hardness testing at a specific location on a part may not represent the physical characteristics of the whole part or end product.
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 comparative test bars that have been standardized according to Test Method E 10 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 impression force used during comparison hardness testing is normally an impact load applied by striking a hammer on the appropriate areas as outlined in the manufacturer's instructions.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety problems, 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.
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Designation: A833 − 08a
StandardPractice for
Indentation Hardness of Metallic Materials by Comparison
1
Hardness Testers
This standard is issued under the fixed designation A833; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. Significance and Use
3.1 The comparative hardness test is an empirical dynamic
1.1 This practice covers the determination of indentation
indentation hardness test. Comparative hardness tests provide
hardness of metallic materials using comparison hardness
useful information about metallic materials. This information
testers.
maycorrelatetotensilestrength,wearresistance,ductility,heat
1.2 This practice applies only to those comparison hardness
treatment condition, or other physical characteristics of metal-
testers, normally portable, that use comparative test bars that
licmaterials,andmaybeusefulinqualitycontrolandselection
have been standardized according to Test Method E10 as a
of materials.
basis for comparison.
3.2 Comparative hardness testing at a specific location on a
1.3 Calibration of comparative test bars (rods), used for
part may not represent the physical characteristics of the whole
comparison to determine hardness numbers, is also covered by
part or end product.
this practice.
4. Apparatus
1.4 The impression force used during comparison hardness
4.1 Comparison hardness testers are used principally for
testing is normally an impact load applied by striking a
testing articles that are too large or unwieldy to be tested in the
hammer on the appropriate areas as outlined in the manufac-
usual types of testing machines, for testing parts of fixed
turer’s instructions.
structures, or for testing under any conditions that require that
1.5 The values stated in SI units are to be regarded as
the indenting force be applied in a direction other than vertical.
standard. No other units of measurement are included in this
4.1.1 Required equipment includes an apparatus that con-
standard.
tains the impression ball and a slot or spacing to insert the
1.6 This standard does not purport to address all of the comparative test bar (rod), the comparative test bar, a structure
safety problems, if any, associated with its use. It is the to apply the impact (anvil), and an impacting tool, normally a
responsibility of the user of this standard to establish appro- hammer. This apparatus is designed to allow a ball impression
priate safety and health practices and determine the applica- to be produced on the standard rod simultaneously with one
bility of regulatory limitations prior to use. produced on the piece to be tested. Comparison of the
impression diameters together with the hardness of the com-
parative bar (rod) is used to determine hardness of the part.
2. Referenced Documents
4.1.2 The structure to convey the impact to the test bar,
2
2.1 ASTM Standards:
impression ball, and part being tested is designed with the
A370 Test Methods and Definitions for Mechanical Testing
striking surface for the impacting tool centered directly above
of Steel Products
the location of the impression ball.
E10 Test Method for Brinell Hardness of Metallic Materials
4.1.3 The apparatus may also be designed to include an
extension for stabilization.
4.1.4 The Brinell hardness of the comparison test bar (rod)
1
This practice is under the jurisdiction of ASTM Committee A01 on Steel,
used should be within 615% of the anticipated Brinell
Stainless Steel and Related Alloysand is the direct responsibility of Subcommittee
hardness of the part being tested, and of the same general type
A01.06 on Steel Forgings and Billets.
of material.
Current edition approved Nov. 1, 2008. Published December 2008. Originally
4.1.5 Impression Ball:
approved in 1984. Last previous edition approved in 2008 as A833 – 08. DOI:
10.1520/A0833-08A.
4.1.5.1 The diameter of the impression ball shall be 10 6
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
0.01 mm.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.1.5.2 The ball shall be made from steel hardened within
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the range of 60 to 67 HRC and shall be capable of being used
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A833 − 08a
in a reasonable number of tests without incurring damage that the test bar at approximately the mid-lengt
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:A 833–08 Designation:A 833–08a
Standard Practice for
Indentation Hardness of Metallic Materials by Comparison
1
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 (´) indicates an editorial change since the last revision or reapproval.
1. 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 comparative test bars that have
been standardized according to Test Method E 10 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 impression force used during comparison hardness testing is normally an impact load applied by striking a hammer on
the appropriate areas as outlined in the manufacturer’s instructions.
1.5
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 This standard does not purport to address all of the safety problems, 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products
E 10 Test Method for Brinell Hardness of Metallic Materials
3. Significance and Use
3.1 The comparative hardness test is an empirical dynamic indentation hardness test. Comparative hardness tests provide useful
information about metallic materials. This information may correlate to tensile strength, wear resistance, ductility, heat treatment
condition, or other physical characteristics of metallic materials, and may be useful in quality control and selection of materials.
3.2 Comparative hardness testing at a specific location on a part may not represent the physical characteristics of the whole part
or end product.
4. Apparatus
4.1 Comparison hardness testers are used principally for testing articles that are too large or unwieldy to be tested in the usual
types of testing machines, for testing parts of fixed structures, or for testing under any conditions that require that the indenting
force be applied in a direction other than vertical.
4.1.1 Required equipment includes an apparatus that contains the impression ball and a slot or spacing to insert the comparative
test bar (rod), the comparative test bar, a structure to apply the impact (anvil), and an impacting tool, normally a hammer. This
apparatus is designed to allow a ball impression to be produced on the standard rod simultaneously with one produced on the piece
to be tested. Comparison of the impression diameters together with the hardness of the comparative bar (rod) is used to determine
hardness of the part.
4.1.2 The structure to convey the impact to the test bar, impression ball, and part being tested is designed with the striking
surface for the impacting tool centered directly above the location of the impression ball.
4.1.3 The apparatus may also be designed to include an extension for stabilization.
1
This practice is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.06
on Steel Forgings and Billets.
Current edition approved MarchNov. 1, 2008. Published MarchDecember 2008. Originally approved in 1984. Last previous edition approved in 20012008 as A833–84
(2001).A 833 – 08.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
A 833–08a
4.1.4 The Brinell hardness of the comparison test bar (rod) used should be within 615% of the anticipated Brinell hardness of
the part being tested, and of the same general type of materi
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