ASTM E1842-96

Standard Test Method for Macro-Rockwell Hardness Testing of Metallic Materials (Withdrawn 2002)

SCOPE
1.1 This test method covers the procedure for Macro-Rockwell hardness testing of metallic materials, employing the Rockwell depth measuring principle (Test Method E 18), with high test forces and 5 or 10-mm diameter tungsten carbide ball indenters.  
1.2 This Macro-Rockwell hardness test method has been developed to satisfy the need for more rapid testing in production environments as compared to conventional Brinell hardness testing. This test method employs the Rockwell test principle of measuring the depth of penetration to determine hardness.  
1.3 Values stated in kilogram-force units are to be regarded as standard. SI units are provided for information only.  
1.4 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.

General Information

• Status: Withdrawn
• Publication Date: 09-Dec-1996
• Withdrawal Date: 10-Jul-2002
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: E28 - Mechanical Testing
• Drafting Committee: E28.06 - Indentation Hardness Testing

Standards Content (Sample)

Designation: E 1842 – 96 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
1
Macro-Rockwell Hardness Testing of Metallic Materials
This standard is issued under the fixed designation E 1842; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Definitions of Terms Specific to This Standard:
3.2.1 Macro-Rockwell hardness number, HMR—a number
1.1 This test method covers the procedure for Macro-
derived from the permanent increase in depth of indentation
Rockwell hardness testing of metallic materials, employing the
and denoted by the symbol HMR preceded by the hardness
Rockwell depth measuring principle (Test Method E 18), with
value and followed by numbers representing the ball indenter
high test forces and 5 or 10-mm diameter tungsten carbide ball
diameter and the total kilogram test force. The combination of
indenters.
test force and ball diameter indicate the scale. Example: 359
1.2 This Macro-Rockwell hardness test method has been
HMR 10/3000 5 Macro-Rockwell hardness of 359 measured
developed to satisfy the need for more rapid testing in
on the 10/3000 scale. All Macro-Rockwell hardness numbers
production environments as compared to conventional Brinell
are to be reported to the nearest whole number, rounding to be
hardness testing. This test method employs the Rockwell test
in accordance with Practice E 29.
principle of measuring the depth of penetration to determine
3.2.2 Macro-Rockwell hardness test—an indentation hard-
hardness.
ness test using a verified machine to force a tungsten carbide
1.3 Values stated in kilogram-force units are to be regarded
ball under specified conditions, into the surface of the material
as standard. SI units are provided for information only.
under test in two operations, and to measure the difference in
1.4 This standard does not purport to address all of the
depth of the indentation under the specified conditions of
safety concerns, if any, associated with its use. It is the
preliminary and total test forces.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use.
4.1 The Macro-Rockwell hardness test is an indentation
2. Referenced Documents hardness test that provides useful information about metallic
materials. This information may correlate to tensile strength,
2.1 ASTM Standards:
2
wear resistance, ductility, and other mechanical characteristics
E 4 Practices for Force Verification of Testing Machines
of metallic materials.
E 6 Terminology Relating to Methods of Mechanical Test-
2
4.2 Macro-Rockwell hardness testing at a specific location
ing
on a part may not represent the mechanical characteristics of
E 18 Test Methods for Rockwell Hardness and Rockwell
2
the whole part or end product.
Superficial Hardness of Metallic Materials
4.3 Macro-Rockwell hardness tests are considered satisfac-
E 29 Practice for Using Significant Digits in Test Data to
3
tory for acceptance testing of commercial shipments.
Determine Conformance with Specifications
E 74 Practice of Calibration of Force-Measuring Instru-
General Description and Test Procedure for Macro-
ments for Verifying the Force Indication of Testing Ma-
Rockwell Hardness Test Methods
2
chines
E 92 Test Method for Vickers Hardness of Metallic Mate-
5. Apparatus
2
rials
5.1 General Principles—The general principles of the
Macro-Rockwell hardness test are illustrated in Fig. 1. Tables
3. Terminology
1 and 2 define scales and symbols used in the Macro-Rockwell
3.1 General terminology related to hardness testing can be
hardness test.
found in Terminology E 6.
5.2 The test machine shall be capable of applying predeter-
mined forces as shown in Table 1, and in accordance with
1
Annex A1.
This test method is under the jurisdiction of ASTM Committee E-28 on
Mechanical Testing and is the direct responsibility of Subcommittee E28.06 on
5.3 The tungsten carbide ball indenter shall be in accor-
Indentation Hardness Testing.
dance with A1.3.2.
Current edition approved Dec. 10, 1996. Published February 1997.
2 5.4 The measuring device shall be in accordance with
Annual Book of ASTM Standards, Vol 03.01.
3
Annual Book of ASTM Standards, Vol 14.02. A1.3.3.
1

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E 1842
FIG. 1 Macro-Rockwell Hardness Test Method (Schematic Diagram)
TABLE 1 Macro-Rockwell Hardness Scales
Preliminary Test Additional Test Field of Application
Macro-Rockwell Indenter Diameter, Total Force, F,
Force, F , Force, F , Macro-Rockwell Hardness
0 1
Hardness Scale mm k
...