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    ASTM E18-00

    Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
    • 발행일 : 2002-01-10
    • 발행기관 : ASTM
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분야 03.01 : 금속-기계적 시험;가열 및 저온시험;금속 조직학
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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.

1.3 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 6.)

Note 1—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 2—In previous editions of this standard, ball indenters were required to be of hard steel. Beginning with this edition, tungsten-carbide balls are also allowed. This change is a first step in a planned future transition to eliminate steel balls and allow only the use of tungsten carbide balls. The elimination of steel ball indenters is scheduled to occur in about two years. 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. In addition, NIST is planning to standardize the HRB scale using tungsten-carbide balls. As a result of this change, this edition also requires that when a ball indenter is used, the Rockwell hardness value must be reported with the scale designation followed by the letter "S" to indicate the use of a steel ball or the letter "W" to indicate the use of a tungsten carbide ball. 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.
국제분류(ICS)코드 77.040.10 : 금속의 기계적 시험
페이지수 15
Edition 00

이력정보

No. 표준번호 표준명 발행일 상태
1 ASTM E18-24상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2024-04-01 표준
2 ASTM E18-24 REDLINE상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2024-04-01 표준
3 ASTM E18-22 REDLINE상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2022-05-01 구판
4 ASTM E18-22상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2022-05-01 구판
5 ASTM E18-20 REDLINE상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2020-02-01 구판
6 ASTM E18-20상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2020-02-01 구판
7 ASTM E18-19상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2019-01-01 구판
8 ASTM E18-19 REDLINE상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2019-01-01 구판
9 ASTM E18-18a상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2018-10-01 구판
10 ASTM E18-18a REDLINE상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2018-10-01 구판
11 ASTM E18-18상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2018-07-01 구판
12 ASTM E18-17e1상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2017-07-01 구판
13 ASTM E18-17상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2017-07-01 구판
14 ASTM E18-16상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2016-05-01 구판
15 ASTM E18-15상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2015-02-01 구판
16 ASTM E18-14a상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2014-10-01 구판
17 ASTM E18-14상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2014-01-01 구판
18 ASTM E18-12상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2012-12-01 구판
19 ASTM E18-11상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2011-11-01 구판
20 ASTM E18-08b상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2008-12-01 구판
21 ASTM E18-08a상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2008-05-15 구판
22 ASTM E18-08상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2008-01-15 구판
23 ASTM E18-07상세보기 Standard Test Methods for Rockwell Hardness of Metallic Materials 2007-04-01 구판
24 ASTM E18-05e1상세보기 Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials 2005-04-01 구판
25 ASTM E18-05상세보기 Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials 2005-02-01 구판
26 ASTM E18-03e1상세보기 Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials 2003-06-10 구판
27 ASTM E18-03상세보기 Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials 2003-06-10 구판
28 ASTM E18-00상세보기 Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials 2002-01-10 구판
29 ASTM E18-02상세보기 Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials 2002-01-10 구판

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