EESTI STANDARD Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:2014) Heer ee Pe igh reproduce and distribute belongs to the Estonian Centre for Standardisation. ‘Single-user licence. Order No. 162343, 4/5/2015. Right of Use of this electronis document: SPECTRUMLABS SA EL EESTI STANDARDIKESKU:EESTI STANDARD! EESSONA NATIONAL FOREWORD See Eesti standard EVS-EN ISO 6606-1:2014 sisaldab Europa standardi EN ISO 6506-1:2014 inglisekoelset teksti Standard on joustunud _sellekohase avaldamisega EVS Teatajas. Europa standardimisorganisatsioonid on teinud likmetete Europa standardi_—_rahvuslikele kattesaadavaks 24,09.2014. Standard on kattesaadav Eesti Standardikeskusest, teate This Estonian standard EVS-EN TSO 6506-1:2014 consists of the English text of the European standard EN ISO 6506-1:2014. This standard has been endorsed with a notification published in the offical bulletin of the Estonian Centre for Standardisation. Date of Availability of the European standard 24.09.2014. ‘The standard is available from the Estonian Centre for Standardisation TTagasisidet standard sisu kohta on voimalik edastada, kasutades EVS-i veebilohel asuvat tagasiside vor! vOi saates ¢-Kirja melliaadressile standardiosakond@evs.ce. Ics 77,040.10 standard reprodutscerimise ja lovitamise Sigus kuulub Eest Standardikeskusole ancmets palundarine, tasteklaine kopeetimine, salvestaine eeKroonsesse slstee vO edastaming UksKGK rises vOmIS vl lise tet Ina Best Standardkeskuse kal loata on Keeatud Kul Tell on Kisimusi stand orale Koha, vitke palun Unondust Eos Standardikeskusega [Av 10, 10317 Tallinn, Gost yaw. evs.2; telefon GDS 6050: epost nfotevs. = the right to reproduce and dstbute standards belongs tothe Estonian Contre for Standardisation No pat of is paicaon maybe reproduced or ized in an frm aby any means, electric or acharieal, inelucng photocopying Ne ato ten pornisoen tons the Catonion Canto for Sandarcisaton it you nave ay questions about copyright, please contact Estonian Cente for Standardisation ety 0.40047 alan, Estonia wor vs. ce; phone 606 9060; -malinfo@evs ©e Pe aght to reproduce and distribute belongs to the Estonian Centre for Standardisation user licence. Order No, 162343, 4/5/2015, L093372485, Single. Right of Use of this electrons document: SPECTRUMLABS SA ElEUROPEAN STANDARD EN ISO 6506-1 NORME EUROPEENNE EUROPAISCHE NORM September 2014 10s 77,040.10 ‘Supersedes EN 180 6506-1:2005, English Version Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:2014) Matériaux métaique - Essai de dureté rine - Parti: Metatsche Werkstofie- Hérteptfung nach Brinall- Tol: MMathoge 'essa ISO 6508-12014) Pravvertahren (ISO 8806-12014) bute belongs to the Estonian Centre for Standardisation. “Tis European Standrd was approved by CEN on 90 August 2014, [CEN members are bound to comply with the CEN/CENELEG Internal Regulations which stipulate the conditions for giving this European 2 ‘Standard the status of a national standard without any alteration. Up-to-date lists and ‘bibliographical references conceming such national z ‘Standards may be obtained on application fo the CEN-CENELEC Management Centre or to any CEN member, § & “hs Epa Src outst hl rns eg}, Fecha) Avorn ane iaauoge ae yon 8 cenymaroar ne rato sens tet iat ang rl ga a La, ean 3 Pra 5 6 8 ‘= easy EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FOR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, 8-1000 Brussels ©2014 CEN At nghts of explataton in any form and by ay means reserved Ref, No. EN ISO 6506-1:2014 & twondvide for CEN national Members. Right of Use of this electrone document: SPECTRUMLABS SA EL095972488, the nEVS-EN ISO 6506-1:2014 Foreword This document (EN ISO 6606-1:2014) 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 national standard, either by publication of an identicat text or by endorsement, atthe latest by March 2016, and conflicting national standards shall be withdrawn at the latest by March 2018, ‘Attention is drawn to the possiblity that some of the elements of this document may be the subject of patent fights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights ‘This document supersedes EN ISO 6506-1:2005, ‘According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugosiav Republic of Macedonia, France, Germany, Greece, Hungary Iceland, reland, italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice “The text of ISO 6506-1:2014 has been approved by CEN as EN ISO 6508-1:2014 without any modification. 3 3 é é da he right to reproduce and i Je-user licence. Order No. 162343, 4/5/2015, Sinel Right of Use of this electronis document: SPECTRUMLABS SA EL0953724EVS-EN ISO 6506-1:2014 Contents Foreword coo = zt Scope. _ - Normative references... ae Principle... : a . Symbols and abbreviated terms.... . Apparatus... . ee 7 Test piece... . 7 - Procedure on Uncertainty of the results. - - ‘Test report ‘Annex A (normative) Procedure for periodic checking of the testing machine by the user ‘Annex B (normative) Minimum thickness of the test piece in relation to the mean diameter of indentation. weawaueene ‘Annex € (informative) Uncertainty of the measured hardness values... Bibliography. - - (© 150.2014 Allrights reserved Page ean keene iti the Estonian Centre for Standardisation. 41812016. hi to reproduce and distribute betongs to t le-user licence. Order No, 162343, 1093372488, the ng sing! Right of Use of this electronic document: SPECTRUMLABS SAEVS-EN ISO 6506-1:2014 INTERNATIONAL STANDARD Metallic materials — Brinell hardness test — Part 1: Test method 1 Scope ‘This part of ISO 6506 specifies the method for the Brinell hardness test for metallic materials. I's applicable to both fixed location and portable hardness testing machines. For some specific materials and/or products, particular International Standards exist (eg, 1S0 4498) and make reference to this International Standard, 2 Normative references ‘The following documents, in whole or in part, are normatively referenced in this document and ar¢ indispensable for its application. For dated references, only the edition cited applies. for undated sess etes the latest edition of the referenced document (including any amendments) applies. 150 4498, Sintered metal materials, excluding hardmetals — Determination of apparent hardness and microhardness 150 6506-2:2014, Metallic materials —Brinell hardness test — Part2: Verification and calibration of testing machines 180 6506-3:2014, Metalic materials — Brinell hardness test — Part 3: Calibration of reference blocks {50 6506-4, Metallic materials — Brinell hardness test — Part 4: Table of hardness values 3. Principle An indenter (tungsten carbide composite ball with diameter, D) is forced into the surface ofa test piece ae iiaiter removal ofthe force, F, the diameter of the indentation, d, let in the surface [s measures. ‘The Brinell hardness is proportional to the quotient obtained by dividing the test force by the curved surface area of the indentation, The indentation is assumed to take the shape of the unloaded ball ara. and its surface area is calculated from the mean indentation diameter and the ball diameter, using the formula given in Table 1. 4 Symbols and abbreviated terms 4.1 See Figure and Table 1. © 180 2014 Allrights reserved 1 ipute belongs to the Estonian Centre for Standardisation. 4/8/2018. 093372485, the right fo reproduce and distil Single-user licence. Order No. 162343, Right of Use of this eledtrorc document: SPECTRUMLABS SAEVS-EN ISO 6506-1:2014 ‘Table 1 — Symbols and abbreviated terms Symbol/ saith : Definition nit abbreviated term oom e D Diameter ofthe ball mm F ‘est force N a Mean diameter of the indentation mm gaditde z aude indentation diameters measured at approximately 90° mm h Depth of indentation . mm BW Brinell hardness constant ee Note) ——————Pest oree Tdealized surface area of indentation | wow = 0.02» as a ror i-% Vo 0,102,702 _|Force-diameter index nore constant = 0202 were 9,006 651s the conversion factor from ft N- 38068 4:2. The following is an example of the designation of Brinell hardness, HBW. EXAMPLE mae yt uration time of test force (20 s), if not within the specified range (10 to 15 s) approximate kgf equivalent of applied test force, where 30 kof = 294,2 N pall diameter in mm hardness symbol Brinell hardness value NOTE. Informer editions ofthis international Standard, when use ofa stel ball was permitted, the Brinell hardness was denoted by HB or HBS. © 180 2014 Allrights reserved ibute belongs to the Estonian Centre for Standardisation. 4/5/2016. 186, the right to reproduce and distr \ce. Order No. 162343, 10933724 Single-user licen Right of Use of this electronic document: SPECTRUMLABS SAEVS-EN ISO 6506-1:2014 on Figure 1 — Principle of test For symbols, see Table. 5 Apparatus 5.1 Testing machine, capable of applying a predetermined test force or test forces within the range of 9/807 N to 29,42 kN, in accordance with 1S0 6506-2. 5.2. Indenter, a polished tungsten carbide composite ball, as specified in ISO 6506-2, 5.3 Indentation diameter measuring system, as specified in 1S0 6506-2. 6 Test piece 6A The test shall be carried out on a surface which is smooth and even; free from oxide scale, foreign matter, and, in particular, Free from lubricants. The test piece shall have a surface finish that will allow an accurate measurement of the diameter of the indentation. NOTE For indentations made with the smaller ball indenters, emight be necessary to polish or lap the surface prior to making the indentation, 62 Preparation shall be carried out in such a way that any alteration of the surface, for example, due to excessive heating or cold-working, is minimized. 63. The thickness of the test piece shall be at least eight times the depth of indentation. Values for the vc nimum thickness of the test piece in relation to the mean diameter of indentation are given in Annex B. Visible deformation at the back of the test piece can indicate that the test piece is too thin. © 150 2024 All rights reserved 3 {fos aght fo reproduce and distribute belongs to the Estonian Centre for Standardisation le-user licence. Order No. 162343, 4/5/2015. 1093372485, singl Right of Use of this electronis document: SPECTRUMLABS SAEVS-EN SO 6506-1:2014 7 Procedure 7.4 Ingeneral, the test should be carried out at ambient temperature within the limits of 10 °C to 35 °C. However because temperature Variation can affect the results, users of the Brinell test can choose to control the temperature within a tighter range, such as 23 °C #5 °C. 7.2. Before performing any tests, confirm that verification has been performed in accordance with AnnexA. 73. The test forces given in Table 2 shall be used. Other test forces and force-diameter indices can be used by special agreement. ‘Table 2 — Test forces for the different testing conditions Frcs] BARR rere mens nae] TEENS Lo tn (0.102 « F/D a awiojso00 | __10 30 29.420 BW 10/3 500 10 15 uno | BW 10/1 000 10 10 9.007 BW 10/500 10 5 4.903 {sw 107250 a0 2482 1B 10/100 10 1 9807 ew 5/750 5 30 7355 _| HBW 5/250 s 10 2.452 HBW 5/125 5 5 1226 BW 5/62,5, 5 25 6128 EW 5/25 5 1 2452 Hew 2,5/1875 25 30 1839 Jaaw2.5/625 25 _ [ars HAW 2,5/31,25 25 5 3065 [Bw 2,5/15,625 25 25 153,2 [new 25/625 25 1 61.29 BW 1/30 1 30 2942 pW 1/10 1 10 07 | HBW 1/5 1 5 4903, Hew 1/2.5 1 | 25 24,52 ew 1/1 fi 1 [9.807 74 The test force should be chosen so that the diameter of the indentation, d, ies between the values F124 D nad 0.6 D. If the diameter of the indentation lies outside these limits, the ratio of indentation dat tar to indenter diameter (d/D) shall be stated in the test report, Table 3 indicates recommended qamediameter indices (0,102 * F/D2) that are appropriate for use when testing certain materials and hardness levels, In order to test the langest representative area of the test piece, the diameter of the indenter ball should be chosen to be as large as possible. 4 (© 1802014 Allrights reserved ti distribute belongs to the Estonian Centre for Standardisation, the right to reproduce and dist (093372486, the right to repr 4/512018. user licence. Order No. 162343, Single-t Rightof Use of this electronic document: SPECTRUMLABS SA ELEVS-EN ISO 6506-1:2014 ‘Table3 — Recommended force-diameter indices for different metallic materials T princi hardness | Force-diameter index Material HEW 0,102 » F/D2 Steel, nickel alloys, titanium alloys _ 30 Cast iron® oo » 2140 20 | <35 5 copper and copper alloys 35 t0200 10 >200 3d <3 25 5 3510 80 10 Light metals and their alloys is 380 10 15 ead in - 1 [Sintered metal According to ISO 4498 ft eng oan rm ei nt fal sale 25 om Sm 75. The test plece shall be placed on a rigid support. The contact surfaces shall be clean and free from foreign matter (scale, oil, dirt, ete). It is important that the test piece lies firmly on the support so that displacement cannot occur during the test. 7.6 Bring the indenter into contact with the test surface and apply the test force in a direction perpendicular to the surface; without shock, vibration, or overrun, until the applied force attains the specified value. The time from the initial application of force to the time the full test force is reached shall be 72 s, Maintain the test force for 147] s. For certain materials, where a longer duration of the test force is required, this time shall be applied with a tolerance of +2 s. NOTE Therequirements for the time durations are given withasymmetriclimits. Forexample, 75; sindicates that 7 is the nominal time duration, with an acceptable range of not less than 2 s (7 s~§ s) tomot more than 8s (Ts+15). 7.7 Throughout the test, the testing machine shall be protected from significant shock or vibration, which can influence the test result 7.8 The distance from the edge of the test piece to the centre of each indentation shall be a minimum 7Awo and a half times the mean indentation diameter. The distance between the centres of two adjacent indentations shall be at least three times the mean indentation diameter. 7.9 The optical measurement of the indentation diameter ean be performed with either a manual oF 7 automatic measuring system, The visual field for the optical device should be evenly llluminated, snd the type of illumination shall be unchanged from that used during the machine's direct and indirect verifications and its daily verification. For manual measuring systems, measure the diameter of each indentation in two directions Epproximately perpendicular to each other. The arithmetic mean of the two readings shall be taken for the calculation of the Brinel! hardness. © 150 2014 All rights reserved 5 4/512015, Fi to reproduce and distribute belongs to the Estonian Centre for Standardisation. EL093372486, the rial glee toance. Order No 162043 si Right of Use of this electronic document: SPECTRUMLABS 8!EVS-EN ISO 6506-1:2014 For test pieces with a ground surface, it is recommended that the direction of the indentation measurements be at approximately 45° to the direction of grinding, NOTE1 teshould be noted that for anisotropic materials, for example those which have been heavy coe weed, there might bea diference between the engths ofthe two diameters the Indentation. The specification for the product might indicate limits for such differences. For automatic measuring systems, other validated algorithms to compute the mean diameter are allowed, These algorithms include — the average of a greater number of measurements, and — anassessment of the projected area of the indentation. 7,40 Calculate the Brinell hardness value for tests on flat surfaces using the formula given in Table 1, Zounding the result to three significant figures. The Brinell hardness value can also be determined using the calculation table given in ISO 6506-4 8 Uncertainty of the results Acomplete evaluation of the uncertainty ‘should be done according to Reference [1]. For hardness, independent ofthe type of sources, there are two possibilities forthe determination of the uncertainty. — onepossibility sbased on the evaluation ofall relevant sourcesappearing duringa directcalibration, ‘Asa reference, a EURAMET guidelinel2) is available. — Theother possibility is based on indirect calibration usinga hardness reference’ block, see References {2} to [5]-A guideline for the determination is given in Annex G Ie may not always be possible to quantify all the identified contributions to the uncertainty, n shis case: sey ote of type A standard uncertainty can be obtained from the statistical analysis of repeated Inuentations into the test piece. Care should be taken, if standard uncertainties of type A and B are suinmarized, that the contributions are not counted twice (see 4.3.10 of Reference (1) 9 Testreport Atleastthe following information shall be recorded and included in the report, unless otherwise agreed by the parties involved: a) _areference to this part of ISO 6506 (ie. ISO 6506-1); by alldetails necessary for the complete identification of the test pleces ©) the date of the test; 4). the test temperature if itis not within the limits 10 °C to 35 @) the ratio of indentation diameter to indenter diameter, it falls outside the limits of 0.2410 0,60; 1). the result obtained, in HBW, reported in accordance with the designation specified in 4.2: where conversion to another hardness scale is also performed, the basis and method of this conversion shall be specified (see Reference (6); NOTE Thereisno general process of accurately converting Brinell hardness into other scales of hardness for into tensile strength. 1) additional requirements outside the scope ofthis part of 0 6506; 6 © 180 2014 ~All rights reserved user licence. Order No. 162343, 4/5/2015. (093372485, Singles Rightof Use of ths electroric document: SPECTRUMLABS SA EL Qa Mie rearoduce and diatbute belongs tothe Estonian Centre for StandarisabonEVS-EN ISO 6506-1:2014 ogesiprepueig 10} 2009 ue}o%s3 ayo} sSuojeq eynqHIsD pue eonpoidas oL NEL ow SBFZLEEESE IS AG gay WnalLgads 1UaUns0p quoNDeFe SUH JO 257 JO WHEL 1) details of any occurrence which may have affected the result. “glOzISIP ‘EvEZOL “ON JONI @0U2D)| 18SM-9IOUIS 1802014 Allrignts reservedEVS-EN ISO 6506-1:2014 Annex A (normative) Procedure for periodic checking of the testing machine by the user ‘Acheck of the machine shall be carried out on each day that the machine is used, for each scale that is to ‘be used at approximately the hardness level of the material to be tested. ‘The check involves at least one indentation being made on a hardness reference block, calibrated i aoe eee with ISO 6506-2. If the difference between the mean measured hardness and the block's seer ceue is within the permissible error limits given in 1S0 6506-2:2014, Tables 2 and 3, the cerehine can be regarded as satisfactory. If not, verify that the indenter, specimen holder, and tester aacirne ca condition and repeat the test. IF the machine continues to fail the daily test, an indirect Verification as specified in ISO 6506-2:2014, Clause 5, shall be performed, NOTE tis good metrological practice to maintain a record of these results over a period of time and to use this record to measure reproducibility and monitor drift of the machine. © 150 2014 All rghts reserved Je-user cence. Order No. 162343, 4/5/2015. Sin ight of Use ofthis elecronic document: SPECTRUMLABS SA FL093372489, ation. Sree No reproduce and distribute belongs to the Estonian Centre for StandardsEVS-EN ISO 6506-1:2014 Annex B (normative) Minimum thickness of the test piece in relation to the mean diameter of indentation ‘Table B.A — Minimum test plece thickness values, see 6.3 Dimensions in millimetres Mean diameter ofthe inden’ Minimumihicknessofthetestplece id Det p=25 Des p=10 uz ua [0a 08 [- 04 033 L Os os 06 0,80 0,29 - 07 040 08 053 09 067 | 10 083 | | Li 102 12 123 ase _ 1,3 - 146 0,69 14 _ 172 0,80 - | 15 2.00 082 - 16 105 a7 19 18 134 _ | 19 1,50 2.0 167 _ 22 a 2,04 _ 2a 245 a 26 _ 292, 1,38 [_ 28 i 343 1,60 30 —_ 400 184 32, oma - 2,10 |_ 34 2,38 IE 3,6 - 2,68 38 3.00 a0 Bae 42 | 3,70 © 1502014 All rights reserved 9 5 3 4 5 é 3 : é z £ the right to reproduce and dist user licence. Order No. 162343, 4/5/2015. £L093372485, Single. Rightof Use ofthis elactronic document: SPECTRUMLABS SAEVS-EN ISO 6506-1:2014 10 a 3 Table B.l (continued) z tation r T 7 T ~ = td d a D=25 D=5 p=10 3 4A 408 g 46 448) & 48 491 5 5.0 5.36 § 52 583 a 54 633 a 56 686 % 58 __t 742, 5 69 8,00 3 ht to reproduce and di le-user licence. Order No. 162343, 4/5'2015. '€L093372485, the rial sing Right of Use of this electronic document: SPECTRUMLABS SA @ 150 2014 ~All rights reservedEVS-EN ISO 6506-1:2014 Annex C (informative) Uncertainty of the measured hardness values C1 General requirements ‘The approach for determining uncertainty, presented in this annex, considers only those uncertainties areebited with the overall measurement performance of the hardness testing machine with respect whe hardness reference blocks. These performance uncertainties reflect the combined effect of all the separate uncertainties (Indirect verification). Because of this approach, it is important that the individual machine components are operating within the tolerances. It is strongly recommended that this procedure be applied fora maximum of one year after the successful passing of a direct verification Figure €.1 shows the four-level structure of the metrological chain necessary to define and disseminate hasdnose scales, The chain starts at the international level, using international definitions of the tanlous hardness scales to carry out international intercomparisons. A number of primary hardness Standard machines at the national level “produce” primary hardness reference blocks for the calibration laboratory level. Naturally, direct calibration and the verification of these machines should be at the highest possible accuracy. International [International International level comparisons definitions t n Primary hardness Direct Neer standard machine calibration Calibration Primary hardness [__,| Hardness calioration Direct laboratory level, |_reference blocks machines verification ‘soos (ect an eo vereatons Tardness Farin tra User 10h ay | rfrooniocs mscines [one manne Direct verification Measurement "0 6s (est neta proseaures Figure C.1 — Structure of the metrological chain for the definition and dissemination of hardness scales Measurement uncertainty analysis isa useful tool to help determine sources of error and to understand aera ia teat results, This annex gives guidance on uncertainty estimation, but the values derived fre for information only, unless specifically instructed otherwise by the customer. Most product specifications have tolerances that have been developed over the past years based mainly on the requirements of the product, but also, in part, on the performance of the machine used raanlke the hardness measurement, These tolerances, therefore, incorporate a contribution due to the area sinty of the hardness measurement and It would be inappropriate to make any further allowance Tor this uncertainty by, for example, reducing the specified tolerance by the estimated uncertainty of @ 160 2014 Allrights reserved it to the Estonian Centre for Standardisation. £134337 2488, the right to reproduce and distribute belongs Single-user licence. Order No. 162343, 4/5/2015, Right of Use of tis electronic document: SPECTRUMLABS 5)EVS-EN ISO 6506~ the hardness measurement. In other words, where a product specification states that the hardness of an item shall be higher or lower than a certain value, this should be interpreted as simply specifying thay see eeelhed and calculated hardness value(s) shall meet this requirement, unless specifically stated otherwise in the product standard. C.2 General procedure ‘This procedure calculates an expanded uncertainty, U, associated with the measured hardness vali, ‘Two different approaches to this calculation are given in Tables C.1 and C.2, together with details of the symbols used. In both cases, a number of uncorrelated standard uncertainty sources are combined by the Root-Sum-Square (RSS) method, and then multiplied by the coverage factor, k= 2. NOTE This uncertainty approach makes no allowance for any possible drift in the machine performance MMbsequent to its last calibration, asst assumes that any such changes will be insignificant in magnitude. As such, aera this analysis could be performed immediately after the machine's calibration and the results included in tthe machine's calibration certificate, C3 Bias of the machine ‘The bias, b, fa hardness testing machine (also termed from the difference between ror") isderived, duringan indirect verification, — the certified calibration value of the hardness reference block used, and — the mean hardness value of the five indentations made in this block during verification of the machine, ‘and can be implemented in different ways into the determination of uncertainty. 4 Procedures for calculating uncertainty: Hardness measurement values NOTE In this annex, the abbreviation “CRM" stands for “certified reference material’. In hardness testing Nandards, certified reference material is equivalent to the hardness reference block, i. a piece of material with certified value and associated uncertainty. 4.1 Procedure without consideration of bias (method M1) Method M1 isa simplified method which can be used without needing to consider the magnitude of any systematic error of the hardness testing machine, In M1, the error limit (the amount by which the machine's reading is allowed to differ from the reference block's value) Is used to define one component, Umpe, of the uncertainty. There is no correction of the hardness values with respect to the measured error: “The procedure for the determination of U is explained in Table.C. (see References [1] and (2] in the Bibliography). 5 veda rh uh “88 eo where the result of the measurement is given by XextU (2 12 © 180 2014 All rights reserved ingle-user licence. Order No. 162343, 4/5/2016. ng Right of Use of this electronic document: SPECTRUMLABS Si (Sight fo veproduce and diatsbute belongs to the Estonian Centre for Standardisation. 1€L093372485, thEVS-EN ISO 6506-1:2014 (4.2 Procedure with consideration of bias (method M2) [Asanalternative to method M1, method M2 can be used, This is correlated with the conduct of a control chart, Method M2 can lead to smaller values of uncertainty than method M1. ‘The bias b (step 5 in Table C.2) can be expected to be a systematic effect. In GUM itis recommended theta correction be used to compensate for systematic effects, and this isthe basis of M2. The error limit term, Unpo. is no longer a component in the uncertainty calculation, but either all determined hardness Heres ene to be reduced by b or Ucorr has to be increased by b. The procedure for the determination of Ucorr is explained in Table C.2 (see References (4] and [5] in the Bibliography). Vcore =k Yuen +H * ns 3) where the result of the measurement is given by Kore =(%-5) Vcore (cay orby Xycore =X* core |) (C5) depending on whether the bias (error), b, is considered to be part of the mean value or of the uncertainty. When method M2 used, itisalso necessary to include an additional uncertainty component within the RSS term relating to the value of b employed. This will particularly be the case when — the measured hardness is significantly different from the hardness levels of the blocks used during the machine's calibration, — the machine's bias value varies significantly throughout its calibrated range, and — the material being measured is different from the material of the hardness reference blocks used during the machine's calibration, inall circumstances, a robust method for estimating the uncertainty associated with b is required. 5 Expression of the result of measurement When reporting the measurement result, the method (M1 or M2) used to estimate the uncertainty should also be specified. @ 1802014 Allrights reserved 13 ute belongs to the Estonian Centre for Standardisation. 41512018, ‘duce and dist le-user licence. 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BIPM/IEC/IFCC/ILAC/ISO/IUPAC/IUPAP/OIML, 2008 EURAMET/cg-16/v.01, Guidelines on the Estimation of Uncertainty in Hardness Measurements, 2007 GanaveRr W. Manual of Codes of Practice for the Determination of Uncertainties in Mechanical Tests on Metallic Materials, The Estimation of Uncertainties in Hardness Measurements, Project, No. ‘SMT4-CT97-2165, UNCERT COP 14:2000 GavaveRW, & BineR O, Abschatzung der Messunsicherheitin der Hartepriffung unter Verwendung der indirekten Kalibriermethode, DVM Werkstoffordfung. Tagungsband, 2000, pp. 255-261. POLZINT,, & SCHWENK D. Method for Uncertainty Determination of Hardness Testing; PC file for the Determination, Materialprifung. 2002, 44 pp. 64-71 ISO 18265, Metallic materials — Conversion of hardness values © 180 2014 Al rights reserved Single-user licence. Order No. 162343, 4/5/2015. Right of Use of this electronic document: SPECTRUMLABS SA ELO93372485, {his sight to reproduce end distribute belongs to the Estonian Centre for Standardisation.