ASTM B886-24
(Test Method)Standard Test Method for Determination of Magnetic Saturation (Ms) of Cemented Carbides
Standard Test Method for Determination of Magnetic Saturation (Ms) of Cemented Carbides
SIGNIFICANCE AND USE
5.1 This test method allows the nondestructive measurement of the magnetic fraction of the binder phase in cemented carbide powder materials and sintered product, and may be used as an indirect measure of the carbon level in the material or product.
5.2 Measurement of magnetic saturation provides a comparison of the relative fraction of magnetic binder phase, that is, cobalt, nickel, or iron, present in the material and can be used for acceptance of product to specification.
5.3 Measurement of magnetic saturation can be used as a measure of the quality of powder material.
SCOPE
1.1 This test method covers the determination of magnetic saturation (Ms) of cemented carbide powder materials and sintered products using magnetic saturation induction test instrumentation.
1.2 The values stated in SI units are to be regarded as standard. An exception is the use of Gauss-cm3 per gram, which is a longstanding industry practice.
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B886 − 24
Standard Test Method for
Determination of Magnetic Saturation (Ms) of Cemented
1
Carbides
This standard is issued under the fixed designation B886; 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* E1316 Terminology for Nondestructive Examinations
1.1 This test method covers the determination of magnetic
3. Terminology
saturation (Ms) of cemented carbide powder materials and
sintered products using magnetic saturation induction test 3.1 Definitions:
3.1.1 For definition of terms used in this procedure refer to
instrumentation.
Terminology A340, Terminology B243, and Terminology
1.2 The values stated in SI units are to be regarded as
E1316.
3
standard. An exception is the use of Gauss-cm per gram,
3.1.2 dc—direct current.
which is a longstanding industry practice.
1.3 This standard does not purport to address all of the
4. Summary of Test Method
safety concerns, if any, associated with its use. It is the
4.1 For Permanent Magnet Instrument—A test specimen is
responsibility of the user of this standard to establish appro-
statically positioned with the long axis perpendicular to the
priate safety, health, and environmental practices and deter-
magnetic field generated by a permanent magnet and sensing
mine the applicability of regulatory limitations prior to use.
coils of the test apparatus. The specimen is magnetized to
1.4 This international standard was developed in accor-
induction saturation by the field and translated linearly that the
dance with internationally recognized principles on standard-
intrinsic magnetic moment of the specimen’s binder phase
ization established in the Decision on Principles for the
induces a dc current to flow in the sensing coils of the test
Development of International Standards, Guides and Recom-
apparatus. The induced current is proportional to the amount of
mendations issued by the World Trade Organization Technical
magnetic binder phase present in the test specimen. Measure-
Barriers to Trade (TBT) Committee.
ment of the induced current permits calculation of the intrinsic
magnetic saturation of the test sample.
2. Referenced Documents
2
4.2 For Electromagnet Instrument—A test specimen is
2.1 ASTM Standards:
placed into a holder housing the Hall probe and sensing coils
A340 Terminology of Symbols and Definitions Relating to
which has been positioned between the poles of the electro-
Magnetic Testing
magnet. The magnetic field is increased while the sensing coils
A977/A977M Test Method for Magnetic Properties of High-
measure the magnetic flux of the specimen. The magnetic flux
Coercivity Permanent Magnet Materials Using Hyster-
can be related to the intrinsic magnetic saturation of the test
esigraphs
specimen.
B243 Terminology of Powder Metallurgy
E177 Practice for Use of the Terms Precision and Bias in
5. Significance and Use
ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to
5.1 This test method allows the nondestructive measure-
Determine the Precision of a Test Method
ment of the magnetic fraction of the binder phase in cemented
carbide powder materials and sintered product, and may be
used as an indirect measure of the carbon level in the material
1
This test method is under the jurisdiction of ASTM Committee B09 on Metal
or product.
Powders and Metal Powder Products and is the direct responsibility of Subcom-
mittee B09.06 on Cemented Carbides.
5.2 Measurement of magnetic saturation provides a com-
Current edition approved Feb. 1, 2024. Published February 2024. Originally
parison of the relative fraction of magnetic binder phase, that
approved in 1998. Last previous edition approved in 2019 as B886 – 19. DOI:
is, cobalt, nickel, or iron, present in the material and can be
10.1520/B0886-24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or used for acceptance of product to specification.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.3 Measurement of magnetic saturation can be used as a
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. measure of the quality of powder material.
*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 ----------------------
B886 − 24
6. Interferences 10.4 Repeat measur
...
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: B886 − 19 B886 − 24
Standard Test Method for
Determination of Magnetic Saturation (Ms) of Cemented
1
Carbides
This standard is issued under the fixed designation B886; 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 test method covers the determination of magnetic saturation (Ms) of cemented carbide powder materials and sintered
products using magnetic saturation induction test instrumentation.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurementAn exception is the use of
3
Gauss-cm are included in this standard.per gram, which is a longstanding industry practice.
1.3 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A977/A977M Test Method for Magnetic Properties of High-Coercivity Permanent Magnet Materials Using Hysteresigraphs
B243 Terminology of Powder Metallurgy
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1316 Terminology for Nondestructive Examinations
3. Terminology
3.1 Definitions:
3.1.1 For definition of terms used in this procedure refer to Terminology A340, Terminology B243, and Terminology E1316.
3.1.2 dc—direct current.
1
This test method is under the jurisdiction of ASTM Committee B09 on Metal Powders and Metal Powder Products and is the direct responsibility of Subcommittee B09.06
on Cemented Carbides.
Current edition approved April 1, 2019Feb. 1, 2024. Published May 2019February 2024. Originally approved in 1998. Last previous edition approved in 20122019 as
B886B886 – 19.– 12. DOI: 10.1520/B0886-19.10.1520/B0886-24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM 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 ----------------------
B886 − 24
4. Summary of Test Method
4.1 For Permanent Magnet Instrument—A test specimen is statically positioned with the long axis perpendicular to the magnetic
field generated by a permanent magnet and sensing coils of the test apparatus. The specimen is magnetized to induction saturation
by the field and translated linearly that the intrinsic magnetic moment of the specimen’s binder phase induces a dc current to flow
in the sensing coils of the test apparatus. The induced current is proportional to the amount of magnetic binder phase present in
the test specimen. Measurement of the induced current permits calculation of the intrinsic magnetic saturation of the test sample.
4.2 For Electromagnet Instrument—A test specimen is placed into a holder housing the Hall probe and sensing coils which has
been positioned between the poles of the electromagnet. The magnetic field is increased while the sensing coils measure the
magnetic flux of the specimen. The magnetic flux can be related to the intrinsic magnetic saturation of the test specimen.
5. Significance and Use
5.1 This test method allows the nondestructive measurement of the magnetic fraction of the binder phase in cemented carbide
powder materials and sintered product, and may be used as an indirect measure of the carbon level in the material or product.
5.2 Measurement of magnetic saturation provides a comparison of the relative fraction of magnetic binder phase, that is, cobalt,
nickel, or iron
...
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