The proposed revision is to clarify how Brinell hardness values are to be reported to 3 significant digits. The Brinell hardness standard ASTM E 10-10 states that a Brinell hardness value shall be reported as: 9.1.1 The Brinell hardness value H of the test results rounded to three significant digits in accordance with Practice E 29, for example, 125 HBW or 99.2 HBW. However, ASTM standard ASTM E29-08, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications, states in clause 188.8.131.52 that The significance of trailing zeros for numbers represented without the use of a decimal point can only be identified from knowledge of the source of the value. Therefore, a value of 300 HBW can be interpreted as having only one significant digit (the 3) since trailing zero digits may not be significant.
KeywordsBrinell; hardness; mechanical test; metals; Brinell hardness; Metallic hardness ;
Ballot Item Approved as E10-2014 and Pending Publication