1、June 2015 Translation by DIN-Sprachendienst.English price group 12No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 7
2、7.040.10!%CZj“2325571www.din.deDDIN EN ISO 6508-3Metallic materials Rockwell hardness test Part 3: Calibration of reference blocks (ISO 6508-3:2015);English version EN ISO 6508-3:2015,English translation of DIN EN ISO 6508-3:2015-06Metallische Werkstoffe Hrteprfung nach Rockwell Teil 3: Kalibrierung
3、 von Hrtevergleichsplatten (ISO 6508-3:2015);Englische Fassung EN ISO 6508-3:2015,Englische bersetzung von DIN EN ISO 6508-3:2015-06Matriaux mtalliques Essai de duret Rockwell Partie 3: talonnage des blocs de rfrence (ISO 6508-3:2015);Version anglaise EN ISO 6508-3:2015,Traduction anglaise de DIN EN
4、 ISO 6508-3:2015-06SupersedesDIN EN ISO 6508-3:2006-03www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 24 pages06.15 DIN EN ISO 6508-3:2015-06 2 A comma is used as the decimal marker. National foreword This document (EN ISO 6508-3:2015)
5、has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals”, Subcommittee SC 3 “Hardness testing” (Secretariat: DIN, Germany) in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other than chemical analysis)” (Secretariat: AFNOR, France) in accordan
6、ce with the agreement on technical cooperation between ISO and CEN (Vienna Agreement). The responsible German body involved in its preparation was the DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-01-41 AA Hrteprfung fr Metalle. DIN EN ISO 6
7、508 consists of the following parts, under the general title Metallic materials Rockwell hardness test: Part 1: Test methods Part 2: Verification and calibration of testing machines and indenters Part 3: Calibration of reference blocks The DIN Standards corresponding to the International Standards r
8、eferred to in this document are as follows: ISO 376 DIN EN ISO 376 ISO 4287 DIN EN ISO 4287 ISO 6508-1 DIN EN ISO 6508-1 ISO 6508-2 DIN EN ISO 6508-2 ISO/IEC 17011 DIN EN ISO/IEC 17011 ISO/IEC 17025 DIN EN ISO/IEC 17025 Amendments This standard differs from DIN EN ISO 6508-3:2006-03 as follows: a) C
9、lause 4 “Calibration machine and calibration indenter” has been thoroughly revised and extended to include detailed information about reference indenters; b) Clause 9 “Calibration certificate” has been added; c) Annex B “Uncertainty of the mean hardness value of hardness-reference blocks” has been t
10、horoughly revised; d) Annex C “Requirements for reference diamond indenters” has been added; e) the standard has been editorially revised. Previous editions DIN 51303: 1983-11, 1995-01 DIN EN 10109-3: 1995-01 DIN EN 10109-3 Supplement 1: 1995-01 DIN EN ISO 6508-3 Supplement 1: 1999-10 DIN EN ISO 650
11、8-3: 1999-10, 2006-03 DIN EN ISO 6508-3:2015-06 3 National Annex NA(informative)Reference block design (examples) NA.1 Examples of reference block forms Figure NA.1 shows examples of reference block forms, including the arrangement and numbering of inden-tations. All three forms (thickness at least
12、6 mm) are suitable for all Rockwell methods of hardness testing. Key XXX Mark of calibrating agency Figure NA.1 Examples of reference block forms, including arrangement of calibration indentations NA.2 Standard hardness of reference blocks To take account of market needs, the following Rockwell hard
13、ness values should be preferred: For the scales HRB, HRF, HRG, HRE, HRH and HRK the standard hardnesses 20, 30, 40, 50, 60, 80, 90 and 100 HRB, and for the scales HRA, HRC, HRD, HR15N, HR30N and HR45N the standard hardnesses 20, 25, 30, 35, 40, 45, 50, 55, 60, 62/63, 65 and 67 HRC in the areas of ap
14、plication specified in DIN EN ISO 6508-1. NA.3 Calibration of reference blocks The comparability of results of measurements obtained using different testing machines can only be ensured if reference blocks are used which can be traced to a national (measurement) standard. In Germany, such standards
15、are produced and maintained by the Physikalisch-Technische Bundesanstalt (PTB) (German Federal Institute for Science and Technology). The DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), 10772 Berlin, has a list of accredited calibration laboratories which calibrate ha
16、rdness reference blocks. DIN EN ISO 6508-3:2015-06 4 National Annex NA (informative) Bibliography DIN EN ISO 376, Metallic materials Calibration of extensometer systems used in uniaxial testing DIN EN ISO 4287, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitio
17、ns and surface texture parameters DIN EN ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test methods DIN EN ISO 6508-2, Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing machines and indenters DIN EN ISO/IEC 17011, Conformity assessment General
18、requirements for accreditation bodies accrediting conformity assessment bodies DIN EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories English Version Metallic materials - Rockwell hardness test - Part 3:Calibration of reference blocks (ISO 6508-3:2015)M
19、atriaux mtalliques - Essai de duret Rockwell - Partie 3: talonnage des blocs de rfrence (ISO 6508-3:2015) Metallische Werkstoffe - Hrteprfung nach Rockwell -Teil 3: Kalibrierung von Hrtevergleichsplatten(ISO 6508-3:2015)This European Standard was approved by CEN on 10 January 2015. CEN members are b
20、ound 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 concerning such national standards may be obtained on application to the
21、 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 its own language and notified to the CEN-CENELEC Management Centr
22、e 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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania
23、, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN
24、national Members. Ref. No. EN ISO 6508-3:2015 EEUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGEN ISO 6508-3 March 2015 ICS 77.040.10 Supersedes EN ISO 6508-3:2005EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMContents Page Foreword . 3 1 Scope . 4 2
25、 Normative references. 4 3 Manufacture of reference blocks 4 4 Calibration machine and calibration indenter . 5 4.1 General 5 4.2 Calibration machine . 5 4.3 Calibration diamond indenter . 5 4.4 Calibration ball indenter 7 5 Calibration procedure 7 6 Number of indentations . 8 7 Uniformity of hardne
26、ss 8 8 Marking 9 9 Calibration certificate. 10 10 Validity . 10 Annex A (normative) Uniformity of reference blocks 11 Annex B (informative) Uncertainty of the mean hardness value of hardness-reference blocks . 13 Annex C (normative) Requirements for reference diamond indenters 19 Bibliography 20 2DI
27、N EN ISO 6508-3:2015-06 EN ISO 6508-3:2015 (E) Foreword This document (EN ISO 6508-3:2015) 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 o
28、f which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2015, and conflicting national standards shall be withdrawn at the latest by September 2015. Attention is drawn
29、to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 6508-3:2005. According to the CEN-CENELEC Internal Regulations, the natio
30、nal standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lith
31、uania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 6508-3:2015 has been approved by CEN as EN ISO 6508-3:2015 without any modification. “”3DIN EN ISO 6508-3:2015-0
32、6EN ISO 6508-3:2015 (E)1 ScopeThis part of ISO 6508 specifies a method for the calibration of reference blocks to be used for the indirect and daily verification of Rockwell hardness testing machines, as specified in ISO 6508-2:2015.Attention is drawn to the fact that the use of hard metal for ball
33、indenters is considered to be the standard type of Rockwell indenter ball. Steel indenter balls can be used only when complying with ISO 6508-1:2015, Annex A.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its
34、application. For dated references, only the edition cited applies. 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 6
35、508-1:2015, Metallic materials Rockwell hardness test Part 1: Test methodISO 6508-2:2015, Metallic materials Rockwell hardness test Part 2: Verification and calibration of testing machines and indenters3 Manufacture of reference blocks3.1 The block shall be specially manufactured for use as a hardne
36、ss-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 hardness reference block shall be of a thickness not less than 6 mm. To minimize the effect of hardnes
37、s change with increasing number of indents, thicker blocks should be used.3.3 The reference blocks shall be free of magnetism. It is recommended that the manufacturer ensure that the blocks, if made of steel, have been demagnetized at the end of the manufacturing process (before calibration).3.4 The
38、 deviation from surface flatness of the top and bottom surfaces shall be 0,01 mm. The bottom of the blocks shall not be convex. The deviation from parallelism of the top and bottom surfaces shall be 0,02 mm per 50 mm.3.5 The test surface and lower surface shall be free from damage, such as notches,
39、scratches, oxide layers, etc., which can interfere with the measurement of the indentations. The surface roughness, Ra, shall not exceed 0,000 3 mm for the test surface and 0,000 8 mm for the bottom surface. Sampling length is l = 0,8 mm (see ISO 4287:1997, 3.1.9).4DIN EN ISO 6508-3:2015-06 EN ISO 6
40、508-3:2015 (E) 3.6 To 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 e).4 Calibration machine and calibration indenter4.1
41、 General4.1.1 Calibrations and verifications of Rockwell calibration machines and calibration indenters shall be carried out at a temperature of (23 5) C.4.1.2 The instruments used for calibration shall be traceable to national standards.4.2 Calibration machine4.2.1 In addition to fulfilling the gen
42、eral conditions specified in ISO 6508-2:2015, Clause 3, the calibration machine shall also meet the requirements given in 4.2.2, 4.2.3, 4.2.4, 4.2.5, and 4.2.6.4.2.2 The machine shall be directly verified in intervals not exceeding 12 months. Direct verification involves calibration and verification
43、 of the following:a) test force;b) measuring system;c) testing cycle; if this is not possible, at least the force versus time behaviour.4.2.3 The test force shall be measured by means of an elastic proving device (according to ISO 376) class 0,5 or better and calibrated for reversibility, or by anot
44、her method having the same or better accuracy.Evidence should be available to demonstrate that the output of the force-proving device does not vary by more than 0,1 % in a period of 1 s to 30 s, following a stepped change in force.4.2.4 Each test force shall be measured and shall agree with the nomi
45、nal preliminary test force, F0, to within 0,2 % and the nominal total test force, F, to within 0,1 %.4.2.5 The measuring system shall have a resolution of 0,000 1 mm and a maximum expanded uncertainty of 0,000 2 mm, when calculated with a confidence level of 95 % over its working range.4.2.6 The tes
46、ting cycle shall be timed with an uncertainty less than 0,5 s and shall conform to the testing cycle of Clause 5.4.3 Calibration diamond indenter4.3.1 The geometric shape and performance of calibration diamond indenters shall be calibrated as defined below. Direct verification of the geometric shape
47、 shall be made before first use and at a frequency of no greater than five years. Verification of the indenter performance, as specified in 4.3.3, shall be made before first use and at a frequency of no greater than 12 months.4.3.2 The diamond indenter shall be measured on at least eight unique axia
48、l section planes equidistant from each other (e.g. the eight cross-sections will be spaced approximately 22,5 apart at 0, 22,5, 45, 67,5, 90, 112,5, 135, 157,5), and shall meet the following requirements:5DIN EN ISO 6508-3:2015-06EN ISO 6508-3:2015 (E)a) The cone angle shall be measured adjacent to
49、the blend. The diamond cone shall have a mean included angle of (120 0,1). In each measured axial section, the included angle shall be (120 0,17).b) The mean deviation from straightness of the generatrix of the diamond cone adjacent to the blend shall not exceed 0,000 5 mm over a minimum length of 0,4 mm. In each measured section, the deviation shall not exceed 0,000 7 mm.c) The radius of the spherical tip of
