1、BRITISH STANDARD CONFIRMED DECEMBER 1998 BS EN ISO 11125-3:1997 BS 7079-E8: 1994 Incorporating Amendment No. 1 to BS 7079-E8:1994 (which it renumbers as BS EN ISO 11125-3:1997) Preparation of steel substrates before application of paints and related products Test methods for metallic blast-cleaning
2、abrasives Part 3: Determination of hardness The European Standard EN ISO 11125-3:1997 has the status of a BritishStandard ICS 25.220.10; 87.020BSENISO11125-3:1997 This British Standard, having been prepared under the directionof the Surface Treatments and Coatings Standards Policy Committee, waspubl
3、ished under the authorityof the Standards Boardand comes into effect on 15March1994 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference STC/21 Draft for comment 92/50236 DC ISBN 0 580 23049 X Committees responsible for this British Standard The preparati
4、on of this British Standard was entrusted by the Surface Treatments and Coatings Standards Policy Committee (STC/-) to Technical Committee STC/21, upon which the following bodies were represented: Association of Consulting Engineers British Chemical Engineering Contractors Association British Coatin
5、gs Federation Ltd. British Constructional Steelwork Association Ltd. British Grit Association British Railways Board British Steel Industry Department of Transport Electricity Association Institute of Corrosion National Federation of Painting and Decorating Contractors Oil and Colour Chemists Associ
6、ation Paint Research Association Royal Society of Chemistry Amendments issued since publication Amd. No. Date Comments 9729 November 1997 Indicated by a sideline in the marginBSENISO11125-3:1997 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 S
7、cope 3 2 Normative references 3 3 Apparatus 3 4 Sampling 3 5 Preparation of the sample 3 6 Procedure 3 7 Expression of results 4 8 Alternative hardness scales 4 9 Test report 4 Annex A (informative) International Standards for metallic blast-cleaningabrasives 5 Annex ZA (normative) Normative referen
8、ces to international publicationswiththeir relevant European publications 6 List of references Inside back coverBSENISO11125-3:1997 ii BSI 04-2000 National foreword This British Standard has been prepared by Technical Committee STC/21 and is the English language version of EN ISO11125-3:1997 Prepara
9、tion of steel substrates before application of paints and related products Test methods for metallic blast-cleaning abrasives Part 3: Determination of hardness, published by the European Committee for Standardization (CEN). It is identical with ISO11125-3:1993, published by the International Organiz
10、ation for Standardization (ISO). International Standard ISO 11125-3 was prepared by Technical Committee ISO/TC35, Paints and varnishes, Subcommittee SC 12. Preparation of steel substrates before application of paints and related products. The other Parts of BS EN ISO 11125 are: Part 1: Sampling; Par
11、t 2: Determination of particle size distribution; Part 4: Determination of apparent density; Part 5: Determination of percentage defective particles and of microstructure; Part 6: Determination of foreign matter; Part 7: Determination of moisture. A British Standard does not purport to include all t
12、he necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference Publication referred to Corresponding British Standard EN ISO 11125-1:1997 (I
13、SO 11125-1:1993) BS EN ISO 11125 Preparation of steel substrates before application of paints and related products Testmethods for metallic blast-cleaning abrasives Part 1:1997 Sampling Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title pag
14、e, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 11125-3 June 1997 ICS
15、 87.020 Descriptors: Paints, varnishes, substrates, steel products, blast-cleaning, abrasives, metallic abrasives, tests, hardness tests, Vickers hardness English version Preparation of steel substrates before application of paints and related products Test methods for metallic blast-cleaning abrasi
16、ves Part 3: Determination of hardness (ISO 11125-3:1993) Preparation des subjectiles dacier avant application de peintures et de produits assimils Mthodes dessai pour abrasifs mtalliques destins la prparation par projection Partie 3: Determination de la duret (ISO 11125-3:1993) Vorbereitung von Stah
17、loberflchen vor dem Auftragen von Beschichtungsstoffen Prfverfahren fr metallische Strahlmittel Teil 3: Bestimmung der Hrte (ISO11125-3:1993) This European Standard was approved by CEN on 1997-05-28. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condit
18、ions 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 Central Secretariat or to any CEN member. This European Standard exists in three o
19、fficial 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austri
20、a, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Sec
21、retariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 11125-3:1997 EENISO11125-3:1997 BSI 04-2000 2 Foreword The text of the International Standard from Technical Committee ISO/TC35,
22、 Paints and varnishes, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC139, Paints and varnishes, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, eith
23、er by publication of an identical text or by endorsement, at the latest by December1997, and conflicting national standards shall be withdrawn at the latest by December1997. According to CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to im
24、plement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. NOTENormative references to International Standards are listed in Annex Z
25、A (normative)ENISO11125-3:1997 BSI 04-2000 3 1 Scope This is one of a number of parts of ISO11125 dealing with the sampling and testing of metallic abrasives for blast-cleaning. The types of metallic abrasive and requirements on each are contained in the various parts of ISO11124. The ISO 11124 and
26、ISO 11125 series have been drafted as a coherent set of International Standards on metallic blast-cleaning abrasives. Information on all parts of both series is given in Annex A. This part of ISO 11125 specifies a test method for the determination of the Vickers hardness of metallic blast-cleaning a
27、brasives. This method is not recommended for the testing of particle sizes below0,3mm. NOTE 1Accurate testing of particles below0,3mm (gradesS040/G050)is extremely difficult. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provision
28、s of this part of ISO11125. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO11125 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated bel
29、ow. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 6507-2:1983, Metallic materials Hardness test Vickers test Part 2: HV 0,2 to less than HV 5. ISO 11125-1:1993, Preparation of steel substrates before application of paints and related products Test methods
30、for metallic blast-cleaning abrasives Part 1: Sampling. 3 Apparatus 3.1 Hardness tester, for application of a test force up to 10N, and an optical device for magnification of the hardness-test indentations to at least 200. 3.2 Hardness comparison plates, of hardness range similar to the product unde
31、r test. 3.3 Metallurgical sample mounting material, which will harden at temperatures below140 C. NOTE 2The elongation limit value of the mounting material should preferably be at least twice the value of the compressive stress which is exerted on the test specimen due to the applied test force. EXA
32、MPLE 1 A particle of nominal diameter 0,4mm has an area of about 0,126mm 2 . At an applied test force of 9,807N, a compressive stress of about 80N/mm 2results. The elongation limit of the mounting medium should therefore be above160N/mm 2 . NOTE 3Use of a metallurgical sample mounting material which
33、 hardens at temperatures above140 C may lead to a tempering action on the material under test and affect the hardness values obtained. 3.4 Metallurgical sample moulds, at least 25 mm in diameter. 4 Sampling Take a representative sample of the product to be tested, as described in ISO11125-1. 5 Prepa
34、ration of the sample The abrasive particles shall be placed in a single layer in the base of a metallurgical sample mould(3.4) and embedded in the metallurgical sample mounting material (3.3) so that a test sample is obtained which can be abraded and polished. Wet abrading of the sample shall take p
35、lace until one-half of the nominal particle diameter is exposed. The bearing area and the test surface of the mount shall be parallel. NOTE 4Sufficient particles should preferably be taken for each test sample to ensure, as far as possible, that at least half the base area of the test specimen is co
36、vered after abrading and polishing. NOTE 5This mounted sample prepared for hardness testing may also be used for the determination of defective particles and microstructure as described in ISO11125-5 (see Annex A). 6 Procedure Carry out the determination in duplicate. 6.1 Carry out all hardness meas
37、urements at ambient temperature in accordance with ISO6507-2. 6.2 Prior to measuring the hardness of the sample, check the calibration using a hardness comparison plate (3.2) of range similar to the product to be tested. 6.3 Measure the hardness of the samples using a test force of 9,807N, i.e.HV1,
38、when testing particles with a diameter greater than 0,5mm. Measure the hardness of the samples using a test force of 4,904N, i.e.HV0,5, when testing particles with a diameter of0,3mm to0,5mm. Use a test duration of between 10s and 15s.ENISO11125-3:1997 4 BSI 04-2000 6.4 Do not carry out measurements
39、 on particles which are located less than3mm from the edge of the test sample. Make the hardness indentations halfway between the edge and the centre of each particle. Metallic abrasives sometimes contain internal shrinkage defects and voids which remain undetected beneath the surface in a mounted a
40、nd polished sample. These hidden cavities cause a non-uniform hardness indentation and give an erroneous hardness reading. These indentations shall be ignored. NOTE 6Definitions of defects are given in the part of ISO11124 appropriate to the material under test. 6.5 Make ten acceptable indentations
41、in different particles for each test sample, disregarding any indentations that have a difference between the two diagonals of greater than5%. Record the ten hardness values obtained. 7 Expression of results From the ten hardness values obtained, calculate the percentage conformance with the require
42、ments specified in the appropriate part of ISO11124 (seeAnnex A). NOTE 7The arithmetic mean may also be calculated, although this is not necessary when using this method to assess compliance with the appropriate parts of ISO11124. 8 Alternative hardness scales There is no general procedure for accur
43、ately converting Vickers hardness into other scales of hardness or into tensile strength. Such conversions should therefore be avoided, unless a reliable basis for conversion can be obtained by comparison tests. A strict comparison of hardness values is only possible at identical test forces. 9 Test
44、 report The test report shall contain at least the following information: a) all details necessary to identify the product tested, in accordance with the appropriate part of ISO 11124 (see Annex A), if applicable; b) a reference to this part of ISO 11125 (ISO11125-3); c) the result of the test; d) a
45、ny deviation from the test method specified; e) the date of the test; f) the name of the person who carried out the test.ENISO11125-3:1997 BSI 04-2000 5 Annex A (informative) International Standards for metallic blast-cleaning abrasives Requirements and test methods for metallic blast-cleaning abras
46、ives are contained in ISO11124 and ISO 11125, respectively. ISO 11124 will consist of the following parts, under the general title: Preparation of steel substrates before application of paints and related products Specification for metallic blast-cleaning abrasives Part 1: General introduction and c
47、lassification; Part 2: Chilled-iron grit; Part 3: High-carbon cast-steel shot and grit; Part 4: Low-carbon cast-steel shot; Part 5: Cut steel wire. ISO 11125 will consist of the following parts, under the general title: Preparation of steel substrates before application of paints and related product
48、s Test methods for metallic blast-cleaning abrasives Part 1: Sampling; Part 2: Determination of particle size distribution; Part 3: Determination of hardness; Part 4: Determination of apparent density; Part 5: Determination of percentage defective particles and of microstructure; Part 6: Determinati
49、on of foreign matter; Part 7: Determination of moisture; Part 8: Determination of abrasive mechanical properties.ENISO11125-3:1997 6 BSI 04-2000 Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
