ASTM E140-07 PDF

You are on page 1of 25 Search inside document Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness1 This standard is issued under the fixed designation E; 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. This standard has been approved for use by agencies of the U.

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You are on page 1of 25 Search inside document Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness1 This standard is issued under the fixed designation E; 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. This standard has been approved for use by agencies of the U. Department of Defense. These hardness range on the relationship among Leeb Type D hardness conversion relationships are intended to apply par- hardness, Brinell hardness, Vickers hardness, and Rockwell ticularly to the following: nickel-aluminum-silicon specimens hardness of non-austenitic steels including carbon, alloy, and finished to commercial mill standards for hardness testing, tool steels in the as-forged, annealed, normalized, and covering the entire range of these alloys from their annealed to quenched and tempered conditions provided that they are their heavily cold-worked or age-hardened conditions, includ- homogeneous.

The equations given in Mechanical Testing and are the direct responsibility of Subcommittee E Published May Originally approved in Last previous edition approved in as E 12a. DOI: Appendix X2. The data in Table 10 was calculated from the Annex A10 equations.

Apparatus and Reference Standards discretion and under controlled conditions. Each type of 4. Differences in sensitivity within the range of a given hardness 5. Principle of Method of Conversion scale for example, Rockwell B may be greater than between 5. The conversion cannot be fitted to a single conversion relationship for all values, whether from the tables or calculated from the metals. Indentation hardness is not a single fundamental equations, are only approximate and may be inaccurate for property but a combination of properties, and the contribution specific application.

The modulus of elasticity has been shown to influence conversions 2. Referenced Documents at high hardness levels; and at low hardness levels conversions 2.

Significance and Use Withdrawn 3 6. This is E Practice for Scleroscope Hardness Testing of Metallic because conversions can be affected by several factors, includ- Materials ing the material alloy, grain structure, heat treatment, etc. Methods for Hardness Determinations 6. Because of the wide range of variation among 3. It NOTE 1The comparative hardness test done to generate the conver- is recommended that hardness conversions be applied primar- sion tables in this standard were performed in past years using ASTM test ily to values such as specification limits, which are established methods in effect at the time of testing.

In some cases, the standards have by agreement or mandate, and that the conversion of test data changed in ways that could affect the final results. For example, currently be avoided whenever possible see Note 1. The use of tungsten carbide numbers, the measured hardness and test scale were also balls will produce slightly different hardness results than steel balls.

Therefore, the user is cautioned to consider these differences and to keep reported in parentheses. Standards volume information, refer to the standards Document Summary page on 7. Keywords approximate, all converted hardness numbers shall be rounded 8.

B Annex A1 contains equations converting determined hardness scale numbers to Rockwell C hardness numbers for non-austenitic steels. Refer to 1. C The Brinell hardness numbers in parentheses are outside the range recommended for Brinell hardness testing in 8. D These Scleroscope hardness conversions are based on VickersScleroscope hardness relationships developed from Vickers hardness data provided by the National Bureau of Standards for 13 steel reference blocks, Scleroscope hardness values obtained on these blocks by the Shore Instrument and Mfg.

HV Diamond 1. B Annex A2 contains equations converting determined hardness numbers to Rockwell B hardness numbers for non-austenitic steels.

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ASTM E140 PDF

A number in parentheses indicates the year of last reapproval. This standard has been approved for use by agencies of the Department of Defense. Most Rockwell hardness numbers are presented to the nearest 0. Since all converted hardness values must be considered approximate, however, all converted Rockwell hardness numbers shall be rounded to the nearest whole number in accordance with Practice E Since all converted hardness values must be considered approximate, however, all converted hardness numbers shall be rounded in accordance with Practice E Each type of hardness test is subject to certain errors, but if precautions are carefully observed, the reliability of hardness readings made on instruments of the indentation type will be found comparable.

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ASTM E140-07 PDF

Dijar Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Indentation hardness is not a single fundamental property but a combination of properties, and the contribution of each to the hardness number varies with the type of test. B Appendix X2 contains equations converting determined hardness numbers to Rockwell B hardness numbers for non-austenitic steels. B Appendix X5 contains an equation converting determined Brinell hardness numbers to Rockwell B hardness numbers for austenitic steel plate in the annealed condition.

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More E Область применения 1. Эти взаимосвязи твердости предназначены, в частности, для никель-алюминий-кремниевых образцов, обработанных по стандартам промышленных предприятий для испытаний на твердость, охватывающих полный ассортимент указанных сплавов в состоянии от отожженного до сильно нагартованного либо дисперсноупрочнённого, включая промежуточные состояния. Большая часть значений твердости по Роквеллу приведена с точностью до 0,1 - 0,5 числа твердости, что позволяет точно воспроизводить эти кривые. Все преобразованные числа твердости следует считать приближенными, однако все преобразованные числа твердости по Роквеллу должны быть округлены до ближайшего целого согласно Методике E Все преобразованные числа твердости следует считать приближенными, однако все преобразованные числа твердости должны быть округлены согласно Методике E Преобразование следует проводить с осторожностью и при контролируемых условиях.

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ASTM E140-12

More E Scope 1. These hardness conversion relationships are intended to apply particularly to the following: nickel-aluminum-silicon specimens finished to commercial mill standards for hardness testing, covering the entire range of these alloys from their annealed to their heavily cold-worked or age-hardened conditions, including their intermediate conditions. Most Rockwell hardness numbers are presented to the nearest 0.

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