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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Most Rockwell hardness numbers are presented to the nearest 0.

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. These hardness conversion relationships are intended to apply particularly to the following: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

The equations given in Annex A10 were developed at the time aastm Leeb hardness test was invented see Appendix X2. 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.

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Active view current version of 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.

ASTM E140-07

These hardness conversion relationships are intended to apply xstm to the following: Since all converted hardness values must be considered approximate, however, all converted hardness numbers shall be rounded 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.

The data in Table 10 was calculated from the Annex A10 equations.

This is because conversions can be affected by several factors, including the material alloy, grain structure, heat treatment, etc. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Calam̩o РASTM E

The conversion values, whether from the tables or calculated from the equations, are only approximate asgm may be inaccurate for specific application. The equations given in Annex A1- Annex A9 were developed from the data in Tables 1 to 9, respectively. Since all converted hardness values must be considered approximate, however, all converted Rockwell hardness xstm shall be rounded to the nearest whole number in accordance with Practice E It is recommended that hardness conversions be applied primarily to aetm 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.

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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.

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

Historical Version s – view previous versions of standard. Link to Active This link will always route to the current Active version of the standard.

Link to Active This link will always route to the current Active version of the standard.

Most Rockwell hardness numbers are presented to the nearest 0.