SANS 6506-3-2009 Metallic materials - Brinell hardness test Part 3 Calibration of reference blocks《金属材料 布氏硬度试验 第3部分：标准试块的校验》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22671-8 SANS 6506-3:2009Edition 2ISO 6506-3:2005Edition 2SOUTH AFRICAN NATIONAL STANDARD Metallic materials Brinell hardness test Part 3:

4、Calibration of reference blocks This national standard is the identical implementation of ISO 6506-3:2005 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27

5、 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 6506-3:2009 Edition 2 ISO 6506-3:2005 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 164, Engineering materials Mechanical testing of metals, in accor

6、dance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in October 2009. This SANS document supersedes SANS 6506-3:2003 (edition 1). Reference numberISO 6506-3:2005(E)ISO 2005INTERNATIONAL STANDARD ISO6506-3Second ed

7、ition2005-12-15Metallic materials Brinell hardness test Part 3: Calibration of reference blocks Matriaux mtalliques Essai de duret Brinell Partie 3: talonnage des blocs de rfrence SANS 6506-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS

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11、s given below. ISO 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs m

12、ember body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2005 All rights reservedSANS 6506-3:2009This s tandard may only be used and printed

13、by approved subscription and freemailing clients of the SABS .ISO 6506-3:2005(E) ISO 2005 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references 1 3 Manufacture of reference blocks .1 4 Calibration machine 2 5 Calibration procedure .3 6 Number of indentation

14、s 3 7 Uniformity of hardness .4 8 Marking .4 9 Validity 5 Annex A (informative) Uncertainty of measurement of hardness reference blocks 6 Bibliography 9 SANS 6506-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-3:2005(E) iv ISO

15、 2005 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested i

16、n a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commis

17、sion (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical

18、 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall

19、 not be held responsible for identifying any or all such patent rights. ISO 6506-3 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing. This second edition cancels and replaces the first edition (ISO 6506-3:1999) which has been technicall

20、y revised. ISO 6506 consists of the following parts, under the general title Metallic materials Brinell hardness test: Part 1: Test method Part 2: Verification and calibration of testing machines Part 3: Calibration of reference blocks Part 4: Table of hardness values SANS 6506-3:2009This s tandard

21、may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-3:2005(E) ISO 2005 All rights reserved vIntroduction Attention is drawn to the fact that in this part of ISO 6506, only the use of the hardmetal ball indenter is specified. The designation of the Brin

22、ell hardness is HBW and should not be confused with the former designation HB, or HBS when a steel ball indenter was used. SANS 6506-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SANS 6506-3:2009This s tandard may only be used and pri

23、nted by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 6506-3:2005(E) ISO 2005 All rights reserved 1Metallic materials Brinell hardness test Part 3: Calibration of reference blocks 1 Scope This part of ISO 6506 specifies a method for the calibration of referenc

24、e blocks to be used in the indirect verification of Brinell hardness testing machines as described in ISO 6506-2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated refere

25、nces, the latest edition of the referenced document (including any amendments) applies. ISO 376:2004, Metallic materials Calibration of force-proving instruments used for verification of uniaxial testing machines ISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile method Term

26、s, definitions and surface texture parameters ISO 6506-1:2005, Metallic materials Brinell hardness test Part 1: Test method ISO 6506-2:2005, Metallic materials Brinell hardness test Part 2: Verification and calibration of testing machines 3 Manufacture of reference blocks 3.1 The block shall be spec

27、ially manufactured for use as a hardness-reference block. NOTE Attention is drawn to the need to use a manufacturing process which will give the necessary homogeneity, stability of structure and uniformity of surface hardness. 3.2 Each metal block to be calibrated shall be of a thickness not less th

28、an: 16 mm for 10 mm balls; 12 mm for 5 mm balls; 6 mm for smaller balls. NOTE 12 mm for 10 mm balls may be used only if the hardness of the reference block is greater than 150 HBW. 3.3 The reference blocks shall be free of magnetism. It is recommended that the manufacturer shall ensure that the bloc

29、ks, if of steel, have been demagnetized at the end of the manufacturing process. SANS 6506-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-3:2005(E) 2 ISO 2005 All rights reserved3.4 The flatness of the two surfaces and the par

30、allelism of the reference block shall be in accordance with Table 1. Table 1 Requirements for the reference blocks Permissible surface roughness, Raam Diameter of ball mm Tolerance in flatness of the surfaces mm Tolerance in parallelism mm over 50 mm Test surface Bottom surface 10 5 1 2,0 1,5 1,0 NO

31、TE For a hardness value less than 200 HBW, the maximum permissible value of non-uniformity may be 2,0 %. 7.3 The determination of the uncertainty of measurement of hardness-reference blocks is given in Annex A. 8 Marking 8.1 Each reference block shall be marked with the following particulars: a) ari

32、thmetic mean of the hardness values found in the standardizing test, for example: 348 HBW 5/750; b) name or mark of the supplier or manufacturer; c) serial number; d) name or mark of the calibration agency; e) thickness of the block, or an identifying mark on the test surface (see 3.6); f) year of c

33、alibration, if not indicated in the serial number. 8.2 Any mark put on the side of the block shall be upright when the test surface is the upper face. SANS 6506-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-3:2005(E) ISO 2005

34、 All rights reserved 58.3 Each delivered reference block shall be accompanied by a document giving at least the following information: a) a reference to this part of ISO 6506; b) the identity of the block; c) the date of calibration; d) the arithmetic mean of the hardness values and the value charac

35、terizing the non-uniformity of the block (see 7.1); e) information about the location of the reference indentation and the orientation of its measured diameters, together with the mean measured diameter. 9 Validity The hardness-reference block is only valid for the scale for which it was calibrated.

36、 The calibration validity should be limited to a duration of five years. Attention is drawn to the fact that, for Al- and Cu-alloys, the calibration validity could be reduced to two - three years. SANS 6506-3:2009This s tandard may only be used and printed by approved subscription and freemailing cl

37、ients of the SABS .ISO 6506-3:2005(E) 6 ISO 2005 All rights reservedAnnex A (informative) Uncertainty of the mean hardness value of hardness-reference blocks The metrological chain necessary to define and disseminate hardness scales is shown in Figure C.1 in ISO 6506-1:2005. A.1 Direct verification

38、of the hardness-calibration machine A.1.1 Calibration of the test force See ISO 6506-2:2005, Annex A. A.1.2 Calibration of the optical measuring device See ISO 6506-2:2005, Annex A. A.1.3 Verification of the indenter See ISO 6506-2:2005, Annex A. A.1.4 Verification of the test cycle See ISO 6506-2:2

39、005, Annex A. A.2 Indirect calibration of the hardness-calibration machine NOTE In this annex, the index “CRM (Certified Reference Material)” means, according to the definitions of the hardness testing standards, “Hardness Reference Block”. By the indirect verification with primary hardness-referenc

40、e blocks, the overall function of the hardness-calibration machine is checked and the repeatability as well as the deviation of the hardness-calibration machine from the actual hardness value are determined. The uncertainty of measurement of the indirect calibration of the hardness-calibration machi

41、ne follows from the equation: 22 22CM CRM P CRM 1 CRM D msxuu u u u=+ (A.1) where uCRM-Pis the calibration uncertainty of the primary hardness-reference block according to the calibration certificate for k = 1; u-xCRM-1is the repeatability of the hardness-calibration machine; uCRM-Dis the hardness c

42、hange of the primary hardness-reference block since its last calibration due to drift; umsis the standard uncertainty due to the resolution of the optical measuring device. SANS 6506-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6

43、506-3:2005(E) ISO 2005 All rights reserved 7EXAMPLE Primary hardness-reference block: (591,7 3,6) HBW 2,5/187,5 Uncertainty of measurement of the primary hardness-reference block uCRM-1= 1,8 HBW 2,5/187,5 Time drift of the primary hardness-reference block uCRM-D= 0 Resolution of the measuring device

44、 ms= 0,1 m Table A.1 Results of the indirect verification Number Measured indentation diameter, d mm Calculated hardness value, H HBW 1 0,630 5max591,4min2 0,630 0 592,3 3 0,629 5min593,3max4 0,629 7 592,9 5 0,629 5 593,3 Mean value H 0,629 8 592,6 Standard deviation sxCRM10,000 42 0,81 HBW: Brinell

45、 hardness CRM 1CRM 1041xxtsu,n= (A.2) (t = 1,14 for n = 5) Table A.2 Budget of uncertainty of measurement Quantity XiEstimated value xiStandard uncertainty of measurement u(xi) Distribution type Sensitivity coefficient ciUncertainty contribution ui(H) HBW UCRM-1591,7 HBW 1,8 HBW Normal 1,0 1,80 uxCR

46、M-10 HBW 0,41 HBW Normal 1,0 0,41 ums 0,1 m 0,2 m Rectangular 1 909,2 HBW/mm a0,06 uCRM-D0 HBW 0 HBW Triangular 1,0 0 Combined uncertainty of measurement uCM1,85 HBW: Brinell hardness a The sensitivity coefficient follows from: 2222H HD D dddDd+= (A.3) for H = 591,7 HBW, D = 2,5 mm, d = 0,630 0 mm.

47、SANS 6506-3:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6506-3:2005(E) 8 ISO 2005 All rights reservedA.3 Uncertainty of measurement of hardness-reference blocks The uncertainty of measurement of hardness-reference blocks follows f

48、rom the equation 22CRM CM CRM 2xuuu=+ (A.4) where uCRMis the calibration uncertainty of hardness-reference blocks; uxCRM-2is the standard deviation due to the inhomogeneity of the hardness distribution of the hardness-reference block; uCMsee Equation (A.1). Table A.3 Determination of the inhomogenei

49、ty of the hardness-reference block Number Measured indentation diameter, d mm Calculated hardness value, H HBW 1 0,630 4max591,01min2 0,630 1 591,6 3 0,629 4min592,92max4 0,629 6 592,53 5 0,629 7 592,34 Mean value H 0,629 8 592,08 Standard deviation sxCRM-20,000 40 0,77 Standard uncertainty of CRM: CRM 2CRM 2xxtsun= (A.5) with t = 1,14 and n = 5: uxCRM-2= 0,39 HBW Table A.4 Uncertainty of measurement of the hardness-reference block Hardness of hardnes