1、BSI Standards PublicationBS EN ISO 6506-3:2014Metallic materials Brinellhardness testPart 3: Calibration of reference blocksBS EN ISO 6506-3:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO6506-3:2014. It supersedes BS EN ISO 6506-3:2005 which iswithdraw
2、n.The UK participation in its preparation was entrusted to TechnicalCommittee ISE/101/5, Indentation hardness testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contrac
3、t. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 79051 5ICS 77.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authorit
4、y of theStandards Policy and Strategy Committee on 30 September 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6506-3 September 2014 ICS 77.040.10 Supersedes EN ISO 6506-3:2005English Version Metallic materials - Brinell hardness te
5、st - Part 3: Calibration of reference blocks (ISO 6506-3:2014) Matriaux mtalliques - Essai de duret Brinell - Partie 3: talonnage des blocs de rfrence (ISO 6506-3:2014) Metallische Werkstoffe - Hrteprfung nach Brinell - Teil 3: Kalibrierung von Hrtevergleichsplatten (ISO 6506-3:2014)This European St
6、andard was approved by CEN on 30 August 2014. 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 lists and bibliographical references concernin
7、g such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 responsibility of a CEN member into it
8、s own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germa
9、ny, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR
10、NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6506-3:2014 EBS EN ISO 6506-3:2014EN ISO 6506-3:2014 (E) 3 Foreword This document (EN ISO 6506-3:2014
11、) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals“ in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other than chemical analysis)” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a nationa
12、l standard, either by publication of an identical text or by endorsement, at the latest by March 2015, and conflicting national standards shall be withdrawn at the latest by March 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent righ
13、ts. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 6506-3:2005. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Sta
14、ndard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, S
15、pain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 6506-3:2014 has been approved by CEN as EN ISO 6506-3:2014 without any modification. BS EN ISO 6506-3:2014ISO 6506-3:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative ref
16、erences 13 Manufacture of reference blocks . 14 Calibration machine 25 Calibration procedure . 36 Number of indentations 37 Non-uniformity of reference block 48 Marking 49 Validity 5Annex A (informative) Uncertainty of the mean hardness value of reference blocks. 6Bibliography .10BS EN ISO 6506-3:20
17、14ISO 6506-3:2014(E)ForewordISO (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 in a su
18、bject 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 Commission (
19、IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be
20、 noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identif
21、ying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenien
22、ce of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Su
23、pplementary informationThe committee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee SC 3, Hardness testing.This third edition cancels and replaces the second edition (ISO 6506-3:2005), which has been technically revised.ISO 6506 consists of the following part
24、s, 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: Tables of hardness valuesiv ISO 2014 All rights reservedBS EN ISO 6506-3:2014INTERNATIONAL STANDARD ISO 65
25、06-3:2014(E)Metallic materials Brinell hardness test Part 3: Calibration of reference blocks1 ScopeThis part of ISO 6506 specifies a method for the calibration of reference blocks to be used in the indirect verification of Brinell hardness testing machines as described in ISO 6506-2.The procedures n
26、ecessary to ensure metrological traceability of the calibration machine are also specified.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies.
27、For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 376, Metallic materials Calibration of force-proving instruments used for the verification of uniaxial testing machinesISO 6506-1:2014, Metallic materials Brinell hardness test Part 1: Test m
28、ethodISO 6506-2:2014, Metallic materials Brinell hardness test Part 2: Verification and calibration of testing machines3 Manufacture of reference blocks3.1 The block shall be specially manufactured for use as a reference block.NOTE Attention is drawn to the need to use a manufacturing process which
29、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 than 16 mm for 10 mm balls, 12 mm for 5 mm balls, or 6 mm for smaller balls.NOTE 12 mm for 10 mm balls can be used only if the hardne
30、ss 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 blocks, if of steel, have been demagnetized at the end of the manufacturing process.3.4 The flatness of the two surfaces and the parall
31、elism of the reference block shall be in accordance with Table 1. ISO 2014 All rights reserved 1BS EN ISO 6506-3:2014ISO 6506-3:2014(E)Table 1 Requirements for the reference blocksDiameter of ball mmTolerance in flatness of the surfaces mmTolerance in parallelism mm over 50 mmPermissible surface rou
32、ghness RaamTest surface Bottom surface10 0,040 0,050 0,3 0,85 0,030 0,040 0,2 0,82,5 0,020 0,030 0,1 0,81,0 0,020 0,030 0,05 0,8aSampling length: l = 0,80 mm (see ISO 4287).3.5 The test surface shall be free from scratches which interfere with the measurement of the indentations (see Table 1).3.6 To
33、 verify that no material is subsequently removed from the reference block, the thickness at the time of calibration shall be marked on it to the nearest 0,1 mm, or an identifying mark shall be made on the test surface see 8.1, item e).4 Calibration machine4.1 In addition to fulfilling the general re
34、quirements specified in ISO 6506-2:2014, Clause 3, the calibration machine shall also meet the requirements given in 4.2 to 4.7.4.2 The machine shall be verified directly in intervals not exceeding 12 months.Direct verification involvesa) measurement of the test forces,b) measurement of the diameter
35、, hardness, and density of the indenter ball,c) calibration of the indentation diameter measuring device, andd) measurement of the testing cycle, if this is not possible, at least the force versus time behaviour.4.3 The instruments used for verification and calibration shall be traceable to the SI.4
36、.4 Each test force shall be measured a minimum of three times using an elastic proving device of ISO 376 class 0,5 or better. For machines that apply the force by hydraulic or weight systems, these force measurements shall be made at each of three different indenter positions uniformly spaced throug
37、hout its range of movement during machine operation. The mean measurement (at each indenter position, where applicable) shall agree with the nominal value to within 0,1 %.4.5 The indenters shall be measured as specified in ISO 6506-2:2014, 4.3, and shall meet the size, hardness, and density requirem
38、ents given there.4.6 The scale of the indentation diameter measuring system shall be graduated to read to 0,002 mm for indentations made with 10 mm and 5 mm balls, and 0,001 mm for indentations made with balls of less than 5 mm diameter.The indentation diameter measuring system shall be calibrated a
39、gainst a standard scale at a minimum of five intervals over each working range. The performance of the indentation diameter measuring system (defined as the sum of the measured deviation from the standard scale and the expanded uncertainty of the standard scale) in relation to the diameters of inden
40、tation shall be as given in Table 2.2 ISO 2014 All rights reservedBS EN ISO 6506-3:2014ISO 6506-3:2014(E)Table 2 Performance of the indentation diameter measuring deviceDiameter of indentation mmPerformance mmd 1 1,0NOTE For hardness values less than 225 HBW, the maximum permissible value of non-uni
41、formity can be 2,0 %.7.3 Methods for determining the uncertainty of measurement of hardness reference blocks are given in Annex A and Reference 6.8 Marking8.1 Each reference block shall be marked with the following:a) arithmetic mean of the hardness values found in the block calibration, for example
42、: 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 calibration, if not indicated in the serial number.8.2 Any mark put on the side of the
43、block shall be upright when the test surface is the upper face.4 ISO 2014 All rights reservedBS EN ISO 6506-3:2014ISO 6506-3:2014(E)8.3 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 (i.e. ISO 6506-3
44、);b) the identity of the block;c) the date of calibration;d) the arithmetic mean of the hardness values and its associated uncertainty and the value characterizing the non-uniformity of the block (see 7.1);e) information about the location of the reference indentation(s) and the orientations and val
45、ues of the measured diameters, together with the mean measured diameter(s).9 ValidityThe hardness-reference block is only valid for the scale for which it was calibrated.The calibration validity should be limited to a duration of five years. Attention is drawn to the fact that, for Al- and Cu-alloys
46、, the calibration validity should be reduced to two to three years. ISO 2014 All rights reserved 5BS EN ISO 6506-3:2014ISO 6506-3:2014(E)Annex A (informative) Uncertainty of the mean hardness value of reference blocksA.1 GeneralMeasurement uncertainty analysis is a useful tool to help determine sour
47、ces of error and to understand differences between measured values. This annex gives guidance on uncertainty estimation but the values derived are for information only, unless specifically instructed otherwise by the customer.The criteria specified in this part of ISO 6506 for the calibration requir
48、ements of the reference block have been developed and refined over a significant period of time. When determining a specific tolerance that the reference block needs to meet, the uncertainty associated with the use of measuring equipment has been incorporated within this tolerance and it would there
49、fore be inappropriate to make any further allowance for this uncertainty by, for example, reducing the tolerance by the measurement uncertainty. This applies to all measurements associated with the manufacture and calibration of the reference blocks and also to all measurements made when performing a verification of the calibration machine. In each case, it is simply the measured value resulting from the use of the specified measuring equipment that is used to assess compliance with this part of ISO 6506.The metrologic
