1.1 These test methods cover the determination of the differential indentation depth hardness of metallic materials by the differential indentation depth hardness principle. These test methods provide the requirements for differential indentation depth hardness machines and the procedures for performing differential indentation depth hardness tests. 1.2 These test methods include additional requirements in annexes. 1.3 These test methods include nonmandatory information in appendixes that relates to the differential indentation depth hardness test. 1.4 Units-These test methods specify the units of force and length in the International System of Units (SI); that is, force in Newtons (N) and length in micrometers (m). However, because of continued common usage, values are provided in other units of measure for information. 1.5 The test principles, testing procedures, and verification procedures are essentially identical for all the differential indentation depth hardness testing instruments. The testing instruments may use different test forces and indenter shapes. The type and size of the indenters are matched to the design of the instrument by the manufacturer. Accordingly, the indenters, probes, and other instrument components are generally not interchangeable among manufacturers. 1.6 The hardness values reported by these instruments are based on direct correlations to existing hardness scales as determined by each manufacturer for each instrument and hardness scale. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywordsportable; hardness; mechanical test; metals; indentation depth
This standard is needed by the users of instruments it will cover. These instruments have been in use for many years in quality departments for incoming inspection and material qualification. Industries concerned with use of the instruments covered by this proposed standard are oil and gas, transportation, and machinery and tooling. The instruments that use these test methods are generally portable and cover an application range not served by instruments standardized in other test methods.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as E3246-2021 and Pending Publication