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
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Carousel Previous Carousel Next. Jump to Page. Search inside document. Most Rockwell hardness numbers are presented to the nearest 0. Since all converted hardness values must be considered approximate, however, all converted hharcness numbers shall be rounded in accordance with Practice B29 L12 Conversion of hardness values should be used only when itis impossible to test the material under the conditions specitied, and when conversion is made it should be done with diseretion and under controlled conditions.
Each type of hardness testis subject to certain errors, but if precautions ane carefully observed, the reliability of hardness readings made on instruments of the indentation type will be found comparable.
Referenced Documents 2. Methods for Hardness Determinations 3. N, T, T, T, W. The use of tungsten earbids Will produce slightly viflerent hardness results tin see balls Therefore, the use is eautioned to consider these dilfeences and to hee in mind the approximate nature of these conversions When spying ther to the resus tess using tungsten carbide balls 4. Apparatus and Reference Standards 4. Principle of Method of Conversion 5.
Therefore separate conversion tables are necessary for different materials, [Nowe 2—Handness conversion values for other metals based on com- parative test on similar materials having similar mechanical proptis wil be ade to this standard asthe nced arises 6.
Significance and Use 6. Because of the wide range of variation among different materials itis not possible to state confidence limits for the errors in using a conversion chart.
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 compo- sition and methods of processing. It is recommended that hardness conversions be applied pritna- rily to values such as specification limits, which are established by agreement or mandate, and that the conversion of test data be avoided whenever possible se2 Nov 7.
Reporting of Hardness Numbers 7. Keywords 8. Hardnoss Number pel tied ue locke Hardnoss Har 1ckwel Super! Rete o 1. Contains an equation cervering cetemined Binal harass rurers to Rocka 8 hardness nombre fe austne se! Retr oI. Tempers ranged fron annealed to extra hard for Type , witha smaller range of tempers forthe other tyres Test coupon thicknesses ranged from approximately 0. Sous S. Due to inherent inaccuracies in the conversion process, the converted number should be rounded to the nearest whole nber in accordance with Practice X1.
The following equation was generated from the specitie hardness numbers contained in Tse 5 and should not be used for converting numbers outside of the defined hardness range. Due to inherent inaccuracies in the conversion process, the converted number should be rounded to the nearest whole umber in accordance with Practice I!
For ferrous and nonferrous metals softer than HB, a single set of hardness conversion relationships inevitably introduces large errors because of the wide difference that may exist in the amount of cold working before testing, as well as the amount that occuts during the test itself.
This dependence on strain-hardening characteristics can be demonstrated by the Rockwell scales T, T, T, F, and B. As higher forces are used, the increased strain raises the hardness by an amount that depends on the pretest capacity of the metal for strain hardening. For example, an annealed iron and a cold-rolled aluminum alloy may have hhardnesses of 71 and 72 HR 1ST, respectively. This is true of yellow borasses and low-carbon steels and irons. The limiting condi- tions can usually be identified by the appearance of the hardness indentations themselves.
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ASTM E140-07 - Standard Hardness Conversion Table
A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. These hardness conversion relationships are intended to apply particularly to the following: nickel-aluminum-silicon specimens?
Hardness Converter ASTM E140-07 ISO 18265:2003 | Trelleborg
Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More E This is because conversions can be affected by several factors, including the material alloy, grain structure, heat treatment, etc. 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.
Active view current version of standard. Translated Standard: Russian. Other Historical Standards. Work Item s - proposed revisions of this standard. More E 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.