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ASTM-E18:2005 Edition

ASTM-E18:2005 Edition

$58.50

E18-05 Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials

Published By Publication Date Number of Pages
ASTM 2005 22
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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.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
2 Terminology
Significance and Use
Principles of Test and Apparatus
FIG. 1
FIG. 2
3 TABLE 1
TABLE 2
FIG. 3
FIG. 4
TABLE 3
TABLE 4
4 TABLE 5
TABLE 6
5 Test Piece
Procedure
TABLE 7
TABLE 8
6 TABLE 9
TABLE 10
7 FIG. 5
8 Conversion to Other Hardness Scales or Tensile Strength Values
Report
FIG. 6
9 Precision and Bias
TABLE 11
TABLE 12
10 TABLE 13
TABLE 14
TABLE 15
TABLE 16
11 Scope
General Requirements
Verification
12 TABLE 17
TABLE 18
TABLE 19
TABLE 20
13 Procedure for Periodic Checks by the User
TABLE 21
TABLE 22
14 Scope
Manufacture
Standardizing Machine
Standardizing Procedure
Number of Indentations
Uniformity of Hardness
Marking and Certification Requirements
15 Keywords
X1. LIST OF ASTM SPECIFICATIONS GIVING HARDNESS VALUES CORRESPONDING TO TENSILE STRENGTH
X1.1
X2. EXAMPLES OF PROCEDURES FOR DETERMINING ROCKWELL HARDNESS UNCERTAINTY
X2.1 Scope
TABLE 23
16 X2.2 Equations
X2.3 General Requirements
X2.4 General Procedure
17 X2.5 Sources of Uncertainty
18 X2.6 Procedure for Calculating Uncertainty: Indirect Verification
19 X2.7 Procedure for Calculating Uncertainty: Rockwell Hardness Measurement Values
21 X2.8 Procedure for Calculating Uncertainty: Certified Value of Standardized Test Blocks

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