CERTIFICATE OF ANALYSIS ERM®- FA015y Steel Charpy V-notch test pieces Certified value 2) [J]
Uncertainty 3) [J]
Absorbed energy (KV) 1)
1) The absorbed energy (KV) is a method defined measurand. KV is the impact energy required to break a Vnotched bar of standardised dimensions, as defined in EN 10045-1 and ISO 148-1. The certified value is valid only for strikers with a 2 mm tip radius, and in the temperature range of (20 ± 2) °C. 2) The certified value of ERM®-FA015y, and its uncertainty, are traceable to the International System of Units (SI), via the master batch ERM®-FA015v of the same nominal absorbed energy (80 J) by testing samples of ERM®-FA015v and ERM®-FA015y under repeatability conditions on an impact pendulum verified and calibrated with SI-traceably calibrated tools. 3) Estimated expanded uncertainty of the mean KV of the 5 specimens (delivered as 1 set), with a coverage factor k = 2, corresponding to a level of confidence of about 95 %, as defined in the ISO/IEC Guide 98-3:2008; Uncertainty of measurement – Part 3: Guide to the expression of uncertainty in measurement (GUM). The number of degrees of freedom of the certified uncertainty, RM = 53.
This certificate is valid until January 2021.
NOTE European Reference Material ERM®-FA015y was produced and certified under the responsibility of the IRMM according to the principles laid down in the technical guidelines of the European Reference Materials® cooperation agreement between BAM-IRMM-LGC. Information on these guidelines is available on the internet (http://www.erm-crm.org). Accepted as an ERM®, Geel, May 2011 Signed: Prof. Dr. Hendrik Emons European Commission Joint Research Centre Institute for Reference Materials and Measurements Retieseweg 111 B-2440 Geel, Belgium
Registration No. 268-TEST ISO Guide 34 for the production of reference materials
All following pages are an integral part of the certificate. Page 1 of 3
DESCRIPTION OF THE SAMPLE A unit consists of five Charpy V-notch test pieces, which are rectangular steel bars of nominal dimensions 55 mm x 10 mm x 10 mm, with one V-notch, accurately machined to tolerances imposed in EN 10045-2 and ISO 148-3. The five specimens are packed together in a plastic bag filled with oil to prevent oxidation.
METHOD USED FOR CERTIFICATION Charpy pendulum impact tests in accordance with EN 10045-1 and ISO 148-1, using pendulum impact machines with a 2 mm striker tip radius.
Aubert&Duval, Les Ancizes and Gennevillers (FR)
European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Geel (BE), ISO/IEC 17025 accreditation by BELAC No. 268-TEST
Laboratoire National de Métrologie et d’Essais, Trappes (FR), ISO/IEC 17025 accreditation by COFRAC No. 2.1287
SAFETY INFORMATION Precautions need to be taken to avoid injury of the operator by broken specimens when operating the Charpy impact pendulum.
INTENDED USE Samples of ERM®-FA015y correspond to the ‘certified BCR test pieces’ as referred to in EN 10045-2 (Method for the verification of impact testing machines), as well as to the ‘certified reference test pieces’ as defined in ISO 148-3 (Preparation and characterisation of Charpy V reference test pieces for verification of test machines). Sets of five of these certified reference test pieces are intended for the indirect verification of impact testing machines with a striker of 2 mm tip radius, according to procedures described in detail in EN 10045-2 and ISO 148-2. The indirect verification provides an assessment of the bias of the user’s Charpy pendulum impact machine. The bias value is one element in the calculation of the measurement uncertainty of Charpy tests on the pendulum after indirect verification. The certified value and the associated uncertainty (given on page 1 of the certificate) are input parameters for this uncertainty assessment. In addition, when testing limited numbers of samples, the uncertainty calculation requires a check of the number of degrees of freedom, for which one needs the number of degrees of freedom of the certified uncertainty, RM. In the case of ERM-FA015y, RM = 53.
INSTRUCTIONS FOR USE Special attention is drawn to the cleaning and conditioning of the specimens prior to testing. It is mandatory to remove the oil from the sample surface prior to testing, without damaging the edges of the sample. Between the moment of removing the protective oil layer and the actual test, corrosion can occur. This must be avoided by limiting this period of time, while keeping the sample clean. The following cleaning and conditioning procedure is considered to be good practice. 1.
First use absorbent cleaning-tissue to remove the excess oil. Pay particular attention to the notch of the sample, but do not use hard (e.g. steel) brushes to remove the oil from the notch.
Submerge the samples in technically pure ethanol for about 5 minutes. Use of ultrasonication is encouraged, but only if the edges of the samples are prevented from rubbing against each other. To reduce the consumption of solvent, it is allowed to make a first cleaning step with detergent, immediately prior to the solvent step.
Once samples are removed from the solvent, only manipulate the samples wearing clean gloves. This is to prevent development of corrosion between the time of cleaning and the actual test.
Before testing, bring the specimens to the test temperature (20 ± 2) °C. To ensure thermal equilibrium, move the specimens to the test laboratory at least 3 h before the tests.
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After cleaning and equilibration, the 5 samples constituting a CRM-unit need to be broken with a pendulum impact test machine operated in accordance with EN 10045-1 or ISO 148-1 standards. Prior to the tests, the anvils must be cleaned. It must be noted that Charpy test pieces sometimes leave debris on the Charpy pendulum anvils. Therefore, the anvils must be checked regularly and if debris is found, it must be removed. The comparison of the indirect verification results with the certified value and uncertainty must be based on the mean of the 5 measured KV values, because this is the sample size for which the uncertainty of the certified value has been calculated.
STORAGE Specimens should be kept at room temperature (18 ± 5) °C in their original packing until used. The European Commission cannot be held responsible for changes that happen during storage of the material at the customer’s premises, especially of opened samples.
LEGAL NOTICE Neither IRMM, its contractors nor any person acting on their behalf: (a) make any warranty or representation, express or implied, that the use of any information, material, apparatus, method or process disclosed in this document does not infringe any privately owned intellectual property rights; or (b) assume any liability with respect to, or for damages resulting from, the use of any information, material, apparatus, method or process disclosed in this document, save for loss or damage arising solely and directly from the negligence of IRMM.
NOTE A detailed technical report of the certification project is available on www.erm-crm.org. A paper copy can be obtained from IRMM on request. European Commission – Joint Research Centre Institute for Reference Materials and Measurements (IRMM) Retieseweg 111, 2440 Geel (Belgium) Telephone: +32-(0)14-571.722 - Telefax: +32-(0)14-590.406
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