Abstract
For the purpose of finding out the difference of the hardness value of major countries, we obtained the hardness reference blocks for Rockwell scales that were certified at the national metrology institute and four other equivalent institutions, and evaluated them using the hardness testing machines that we own. The experimental result showed a large difference among the institutions; 0.7 HRC with 30HRC and 1.4HRBW with 30HRBW at maximum. ISO6508-2 and ASTM E18 specify the allowance for the indirect verification. However, taking the expected difference of the hardness value and the experimental result into consideration, the verification result implies that the difference may exceed the allowance specified by the ASTM standard.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
