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1、BRITISH STANDARD BS EN ISO 6508-2:1999 Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T) The European Standard EN ISO 6508-2:1999 has the status of a British Standard ICS 77.040.10 Licensed Copy: sheffieldun sh
2、effieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 6508-2:1999 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 November 1
3、999 BSI 03-2000 ISBN 0 580 35049 5 National foreword This British Standard is the English language version of EN ISO 6508-2:1999. It is identical with ISO 6508-2:1999. It supersedes BS EN 10109-2:1996 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee IS
4、E/NFE/4, Mechanical testing of metals, to Subcommittee ISE/NFE/4/5, Indentation hardness testing, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep
5、the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards norma
6、lly include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section
7、entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Com
8、pliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, page 2, the ISO title page, pages ii to iv, pages 1 to 8 and a back cover. This standard ha
9、s been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled
10、 Copy, (c) BSI BS EN ISO 6508-2:1999 BSI 03-2000i Contents Page National forewordInside front cover Foreword2 Forewordiii Text of ISO 6508-21 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na
11、, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6508-2 September 1999 ICS 77.040.10 English version Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G
12、, H, K, N, T) (ISO 6508-2:1999) Matriaux mtalliques Essai de duret Rockwell Partie 2: Vrification et talonnage des machines dessai (chelles A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-2:1999) Metallische Werkstoffe Hrteprfung nach Rockwell (Skalen A, B, C, D, E, F, G, H, K, N, T) Teil 2: Prfung und H
13、rteprfmaschinen (ISO 6508-2:1999) This European Standard was approved by CEN on 8 July 1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date
14、 lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the r
15、esponsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
16、 Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN all rights of exploitation in any form and by any
17、means reserved worldwide for CEN national Members. Ref. No. EN ISO 6508-2:1999 E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 6508-2:1999 BSI 03-2000 2 Foreword The text of the International Standard ISO 6508-2:1999 has been prepar
18、ed by Technical Committee ISO/TC 164 “Mechanical testing of metals” in collaboration with Technical Committee ECISS/TC 1 “Steel testing”, the secretariat of which is held by AFNOR. This European Standard supersedes EN 10109-2:1994. This European Standard shall be given the status of a national stand
19、ard, either by publication of an identical text or by endorsement, at the latest by March 2000, and conflicting national standards shall be withdrawn at the latest by March 2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bo
20、und to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 6
21、508-2:1999 was approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative). Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldu
22、n sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 6508-2:1999 ii BSI 03-2000 Contents Page Forewordiii Introduction1 1Scope1 2Normative references1 3General conditions1 4Direct verification1 5Indirect verification3 6Intervals between verifications5 7Verificatio
23、n report/calibration certificate5 Annex A (normative) Repeatability of testing machines6 Annex ZA (normative) Normative references to international publications with their relevant European publications8 Figure A.1 Rockwell hardness (scales A, B, C, D, E, F, G, H and K)6 Figure A.2 Rockwell superfic
24、ial hardness (scales N and T) 7 Table 1 Hardness levels for different scales2 Table 2 Tolerances for the different ball diameters3 Table 3 Values of mean diagonal (HV) for the determination of the hardness of ball indenters3 Table 4 Hardness ranges for different scales4 Table 5 Permissible repeatabi
25、lity and error of the testing machine5 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 6508-2:1999 BSI 03-2000iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
26、 (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations,
27、governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/
28、IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 6508-2 was prepared by
29、 the Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing. This first edition of ISO 6508-2 cancels and replaces ISO 716:1986 and ISO 1079:1989, of which it constitutes a technical revision as follows: Combination of the two different International Standa
30、rds for the verification of the hardness testing machines (ISO 716:1986 and ISO 1079:1989) into this part of ISO 6508. Addition of clause 6 concerning the intervals between the verifications. Addition of the hardmetal ball as indenter. ISO 6508 consists of the following parts, under the general titl
31、e Metallic materials Rockwell hardness test: Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T); Part 2: Verification and calibration of testing machines (scales A, B, C, D, E, F, G, H, K, N, T); Part 3: Calibration of reference blocks (scales A, B, C, D, E, F, G, H, K, N, T). Annex A form
32、s a normative part of this part of ISO 6508. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 6508-2:1999 BSI 03-20001
33、Introduction The force values in this part of ISO 6508 were calculated from kilogram force values. They were introduced before the SI-system was adopted. It was decided to keep the values based on the old units for this part of ISO 6508 but for the next revision it will be necessary to consider the
34、advantage of introducing rounded values of test force and the consequence on the hardness scales. Attention is drawn to the fact that in this part of ISO 6508, the use of hardmetal balls as indenters is equivalent to the use of steel balls; however, it is indicated that the measurements made with th
35、e two ball types give different results. 1 Scope This part of ISO 6508 specifies a method of verification of testing machines for determining Rockwell hardness (scales A, B, C, D, E, F, G, H, K, N, T). It specifies a direct method for checking the main functions of the machine and an indirect method
36、 suitable for the overall checking of the machine. The indirect method may be used on its own for periodic routine checking of the machine in service. If a testing machine is also to be used for other methods of hardness testing, it shall be verified independently for each method. This part of ISO 6
37、508 is applicable to portable hardness testing machines with the exception of requirements in 6.1 a) in which the word “relocation” does not apply. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of
38、 ISO 6508. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 6508 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated be
39、low. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 376, Metallic materials Calibration of force-proving instruments used for verification of uniaxial testing machines
40、. ISO 3878, Hardmetals Vickers hardness test. ISO 6507-1:1997, Metallic materials Vickers hardness test Part 1: Test method. ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T). ISO 6508-3, Metallic materials Rockwell hardness test Part
41、3: Calibration of reference blocks (scales A, B, C, D, E, F, G, H, K, N, T). 3 General conditions Before a Rockwell hardness testing machine is verified, the machine shall be checked to ensure the following: a) the machine is properly set up; b) the plunger holding the indenter is capable of sliding
42、 in its guide; c) the indenter-holder is firmly mounted in the plunger; d) the test force can be applied and removed without shock or vibration and in such a manner that the readings are not influenced; e) the readings are not affected either by movements of the test piece or by deformation of the f
43、rame. When a device is supplied, which locks the test piece against the upper part of the frame, the locking force shall exceed the total test force. The influence of deformations may be checked by using a plunger with a spherical tip (diameter of at least 10 mm), instead of the indenter, bearing ag
44、ainst the anvil through a spacer and using the locking device when it is supplied. The material of the plunger and of the spacer shall have a hardness of at least 60 HRC. The readings of the measuring device (with preliminary force applied) before application and after removal of the additional forc
45、e shall not differ by more than 1,5 Rockwell units (without locking equipment) and 0,5 Rockwell unit (with locking equipment). 4 Direct verification 4.1 General 4.1.1 Direct verification should be carried out at a temperature of (23 5) C. If the verification is made outside of this temperature range
46、, this shall be reported in the verification report. 4.1.2 The instruments used for verification and calibration shall be traceable to the national standards. 4.1.3 Direct verification involves: a) calibration of the test force; b) verification of the indenter; c) calibration of the depth-measuring
47、device; d) verification of the testing cycle. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:14:55 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 6508-2:1999 2 BSI 03-2000 4.2 Calibration of the test force 4.2.1 The preliminary test force F0 (see 4.2.4) and each total test force F used
48、 (see 4.2.5) shall be measured, and, whenever applicable, this shall be done at no less than three positions of the plunger spaced throughout its range of movement during testing. The preliminary test force shall be held for at least 2 s. 4.2.2 The forces shall be measured by one of the following tw
49、o methods: measuring with a force-proving device of class 1 in accordance with ISO 376 or, balancing against a force, accurate to 0,2 %, applied using calibrated masses by mechanical means. 4.2.3 Three readings shall be taken for each force at each position of the plunger. Immediately before each reading is taken, the plunger shall be moved in the same direction as during testing. 4.2.4 The tolerance on the preliminary test force Fo (before application and after removal of the additiona