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  • ASTM
    E18-17e1 Standard Test Methods for Rockwell Hardness of Metallic Materials
    Edition: 2017
    $148.51
    Unlimited Users per year

Description of ASTM-E18 2017

ASTM E18-17e1

Historical Standard: Standard Test Methods for Rockwell Hardness of Metallic Materials




ASTM E18

Scope

1.1 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.

1.2 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

1.3 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

1.4 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.

1.5 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.

1.6 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.

1.7 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.


Keywords

hardness; mechanical test; metals; Rockwell;


ICS Code

ICS Number Code 77.040.10 (Mechanical testing of metals)


DOI: 10.1520/E0018-17E01

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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