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ASTM A956/A956M-22

Current Revision

Standard Test Method for Leeb Hardness Testing of Steel Products

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1.1 This test method covers the determination of the Leeb hardness of steel, cast steel, and cast iron (Part A), including the methods for the verification of Leeb hardness testing instruments (Part B), and the calibration of standardized test blocks (Part C).

Note 1: The original title of this standard was “Standard Test Method for Equotip Hardness Testing of Steel Products.”1

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 Hardness of a material is a poorly defined term that may have many meanings depending on the type of test performed and the expectations of the person involved. The Leeb hardness test is of the dynamic or rebound type, which primarily depends both on the plastic and on the elastic properties of the material being tested. The results obtained are indicative of the strength and dependent on the heat treatment of the material tested.

5.2 The Leeb hardness test is a superficial determination only measuring the condition of the surface contacted. The results generated at that location do not represent the part at any other surface location and yield no information about the material at subsurface locations.

SDO ASTM: ASTM International
Document Number A956
Publication Date Sept. 1, 2022
Language en - English
Page Count 13
Revision Level 22
Supercedes
Committee A01.13
Publish Date Document Id Type View
Sept. 1, 2022 A0956_A0956M-22 Revision
Nov. 1, 2017 A0956_A0956M-17A Revision
Sept. 1, 2017 A0956_A0956M-17 Revision