Transcription of Standard Hardness Conversion Tables for Metals ...
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Standard Hardness Conversion Tables for Metals ...
Designation: E 140 07 Standard Hardness Conversion Tables for MetalsRelationship Among Brinell Hardness , Vickers Hardness ,Rockwell Hardness , Superficial Hardness , Knoop Hardness ,and Scleroscope Hardness1 This Standard is issued under the fixed designation E 140; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or Standard has been approved for use by agencies of the Department of Scope* ConversionTable 1presents data in the Rockwell Chardness range on the relationship among Brinell Hardness ,Vickers Hardness , Rockwell Hardness , Rockwell superficia
6.2 Since the various types of hardness tests do not all measure the same combination of material properties, conver-sion from one hardness scale to another is only an approximate process. 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.
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