BS ISO BRITISH STANDARD 21988:2006 Abrasion-resistant cast irons Classification ICS 77.080.10 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSIS021988:2006 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 21988:2006. The UK participation in its preparation was entrusted to Technical Committee ISE/35, Cast iron. A list of organizations represented on ISE/35 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was Amendmentsissued sincepublication published underthe authority of the Standards Policy and Amd. No. Date Comments Strategy Committee on 31 January 2007 @BSI 2007 ISBN978 0580 499012 BS ISO 21988:2006 ISO INTERNATIONAL STANDARD 21988 First edition 2006-07-01 Abrasion-resistant cast irons Classification FontesresistantaI'usureparabrasion-Classification Reference number ISO21988:2006(E) ISO = BS ISO 21988:2006 Contents Page Foreword, Introduction 1 Scope 2 Normativereferences 3 Terms and definitions 4 Designation. 2 5 Order information 6 Manufacture. 6.1 General... 6.2 Heat treatment. 3 Requirements 7.1 Chemicalcomposition 3 7.2 Brinell hardness. 7.3 Microstructure.. 8 Sampling.. 8.1 Frequencyofsamplingforchemicalanalysis 8.2 NumberandfrequencyofBrinell hardnesstests 9 Testing 9.1 Chemical analysis.. 9.2 Hardness test 9.3 Microstructuresample 10 10.1 Need for retests... 10.2 Test validity 10.3 Nonconforming test results. 10.4 Heat treatment of castings... 5 AnnexA (informative) Heat treatment.. AnnexB(informative)ConversionbetweenBrinell,VickersandRockwellChardness 10 AnnexC(informative)Relationshipbetweencastingthicknessandchemicalcompositionfor nickel-chromiumcastirons.... 11 AnnexD (informative)Typical microstructures of abrasion-resistant cast iron 12 AnnexE(informative)Crossreferencestootherstandards .13 Bibliography 14 ii BSIS0 21988:2006 Foreword IsO (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 non-governmental, in liaison with IsO, also take part in the work. Iso collaborates closely with the InternationalElectrotechnicalCommission(iEC)onallmattersofelectrotechnicalstandardization International Standards are drafted in accordance with the rules given in the IsO/lEC Directives, Part 2 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. ISO 21988 was prepared by Technical Committee ISO/TC 25, Cast irons and pig irons, Subcommittee SC 6 High alloy cast irons. This International Standard is one of a number that has been prepared by ISO/TC 25/SC 6 under the auspices however, the funding and resources for the Secretariat have been provided by the Cast Metals Federation. iv BSIS021988:2006 Introduction This International Standard deals with the classification of abrasion-resistant white cast irons in accordance with their chemical composition and hardness. Such cast irons are widely used in the mining, earth moving, milling and manufacturing industries where high resistance to abrading minerals and other abrading solids is required. the application. These properties are obtained by careful control of the material composition and the processing route. V