ASTM E140 PDF

ASTM E Standard Hardness Conversion Tables for Metals Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Superficial. Hardness Conversion per ASTM E, Strength per ASTM A, See bottom half of table. Hardness C. Hardness Conversion Ta rdness Conversion Table. This standard is issued under the fixed designation E ; the number 1 These conversion tables are under the jurisdiction of ASTM Committee E28 on.

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It is recommended that hardness conversions be applied primarily to values such as specification limits, which are established by agreement or mandate, and that the conversion of test data be avoided whenever possible see Note 1.

The equations given in Annex A1- Annex A9 were developed from the data in Tables 1 to 9, respectively. These hardness conversion relationships are intended to apply particularly to the following: The atm in Table 10 was calculated from the Annex A10 equations.

ASTM E140-07

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Link to Active This link will always route to the current Active version of the standard. Differences in sensitivity within the range of a given hardness scale for example, Rockwell B may be greater than between two different scales or types of instruments.

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Most Rockwell hardness numbers are presented e410 the nearest 0.

Each type of hardness test is subject to certain errors, but asm precautions are carefully observed, the reliability of hardness readings made on instruments of the indentation type will be found comparable. Since all converted hardness values must aetm considered approximate, however, all converted Rockwell hardness numbers shall be rounded to the nearest whole number in accordance with Practice E Differences in sensitivity within the range of a given hardness scale for example, Rockwell B may be greater than between two different scales or types of instruments.

ASTM Hardness Conversion Chart

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.

Most Rockwell hardness numbers are presented to the nearest 0.

Active view sstm version of standard. The equations given in Annex A10 were developed at the time the Leeb hardness test was invented see Appendix X2. This is because conversions can be affected by several factors, including the material alloy, grain structure, heat treatment, etc. Historical Version s – view previous versions of standard.

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The conversion values, whether from the tables or calculated from the equations, are only approximate and may be inaccurate for specific application.

Link to Active This link will always route to the current Active version of the standard. Even in the case of a table established for a single material, such as the table for cartridge brass, some error is involved depending on composition and methods of processing.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. These hardness conversion relationships are intended to apply particularly to the following: The conversion values, whether from the tables or calculated from the equations, are only approximate and may be inaccurate for specific application.

Since all converted hardness values must be considered approximate, however, all converted hardness numbers shall be rounded in accordance with Practice E Because of the wide range of variation among different materials, it is not possible to state confidence limits for the errors in using a conversion chart.