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# ASTM International - ASTM E18-05

## Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials

inactive
 Organization: ASTM International Publication Date: 1 February 2005 Status: inactive Page Count: 22 ICS Code (Mechanical testing of metals): 77.040.10
##### scope:

1.1 These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials, including test methods for the verification of machines for Rockwell hardness testing (Part B) and the calibration of standardized hardness test blocks (Part C).

1.2 Values stated in inch-pound units are to be regarded as the standard. SI units are provided for information only.

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. (See Note 0.)

Note 2

The National Institute of Standards and Technology (NIST) maintains the national Rockwell hardness standards for the United States. In June 1998, NIST released new Rockwell C scale (HRC) test blocks as Standard Reference Materials (SRMs). The blocks were calibrated using NIST's primary reference standardizing machine. The major benefit of the NIST standards is that their HRC levels are in line with the other industrialized countries around the world. The NIST HRC levels establish the hardness of materials slightly harder than the historical standards used in the United States for the past 75 years. The revision of E 18 requires that all performance verifications of Rockwell hardness indenters and hardness machines must be made using test blocks calibrated traceable to the Rockwell standards maintained by NIST. This can be accomplished through the use of commercial test blocks calibrated traceable to the NIST standards or by directly using the NIST SRMs. This requirement will apply only to the Rockwell scale(s) for which NIST supplies primary reference test blocks

Note 3

Previous editions of this standard have stated that the steel ball was the standard type of Rockwell indenter ball. Starting with this edition, the tungsten carbide ball is considered the standard type of Rockwell indenter ball. The use of tungsten carbide balls will provide an improvement to the Rockwell hardness test because of the tendency of steel balls to flatten with use, which results in an erroneously elevated hardness value. The user is cautioned that Rockwell hardness tests comparing the use of steel and tungsten carbide balls have been shown to give different results. For example, depending on the material tested and its hardness level, Rockwell B scale tests using a tungsten carbide ball indenter have given results up to one Rockwell point lower than when a steel ball indenter is used.

### Document History

February 1, 2020
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
January 1, 2019
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
October 1, 2018
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
July 1, 2018
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
July 1, 2017
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
July 1, 2017
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
May 1, 2016
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
February 1, 2015
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
October 1, 2014
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
January 1, 2014
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
December 1, 2012
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
November 1, 2011
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
December 1, 2008
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
May 15, 2008
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
January 15, 2008
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
April 1, 2007
Standard Test Methods for Rockwell Hardness of Metallic Materials
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...
April 1, 2005
Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
1.1 These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials, including test methods for the verification of machines for...
ASTM E18-05
February 1, 2005
Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
1.1 These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials, including test methods for the verification of machines for...
June 10, 2003
Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
1.1 These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials, including test methods for the verification of machines for...
June 10, 2003
Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
1.1 These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials, including test methods for the verification of machines for...
January 10, 2002
Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
1.1 These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials, including test methods for the verification of machines for...
January 10, 2002
Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
1.1 These test methods cover the determination of the Rockwell hardness and the Rockwell superficial hardness of metallic materials, including test methods for the verification of machines for...