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ASTM E18

2017 Edition, July 1, 2017

Complete Document

Standard Test Methods for Rockwell Hardness of Metallic Materials

Includes all amendments and changes through Change/Amendment , July 1, 2017


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Product Details:

  • Revision: 2017 Edition, July 1, 2017
  • Published Date: July 1, 2017
  • Status: Historical
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 38
  • ANSI Approved: Yes
  • DoD Adopted: Yes

Description / Abstract:

These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials by the Rockwell indentation hardness principle. This standard provides the requirements for Rockwell hardness machines and the procedures for performing Rockwell hardness tests.

This standard includes additional requirements in annexes:

Verification of Rockwell Hardness Testing Machines Annex A1

Rockwell Hardness Standardizing Machines Annex A2

Standardization of Rockwell Indenters Annex A3

Standardization of Rockwell Hardness Test Blocks Annex A4

Guidelines for Determining the Minimum Thickness of a Test Piece Annex A5

Hardness Value Corrections When Testing on Convex Cylindrical Surfaces  Annex A6

This standard includes nonmandatory information in appendixes which relates to the Rockwell hardness test.

List of ASTM Standards Giving Hardness Values Corresponding to Tensile Strength Appendix X1

Examples of Procedures for Determining Rockwell Hardness Uncertainty Appendix X2

Units—At the time the Rockwell hardness test was developed, the force levels were specified in units of kilograms-force (kgf) and the indenter ball diameters were specified in units of inches (in.). This standard specifies the units of force and length in the International System of Units (SI); that is, force in Newtons (N) and length in millimeters (mm). However, because of the historical precedent and continued common usage, force values in kgf units and ball diameters in inch units are provided for information and much of the discussion in this standard refers to these units.

The test principles, testing procedures, and verification procedures are essentially identical for both the Rockwell and Rockwell superficial hardness tests. The significant differences between the two tests are that the test forces are smaller for the Rockwell superficial test than for the Rockwell test. The same type and size indenters may be used for either test, depending on the scale being employed. Accordingly, throughout this standard, the term Rockwell will imply both Rockwell and Rockwell superficial unless stated otherwise.

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.

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.

*A Summary of Changes section appears at the end of this standard