SIST EN 993-11:2008
(Main)Methods of test for dense shaped refractory products - Part 11: Determination of resistance to thermal shock
Methods of test for dense shaped refractory products - Part 11: Determination of resistance to thermal shock
This European Standard describes two alternative methods for determining the resistance to thermal shock of dense shaped refractory materials by an air quenching method, which proved to give the most reliable results when compared with the behaviour of refractories in furnace linings.
Method B can also be applied to unshaped refractory materials.
Prüfverfahen für dichte geformte feuerfeste Erzeugnisse - Teil 11: Bestimmung der Temperaturwechselbeständigkeit
Diese Europäische Norm legt zwei alternative Verfahren zur Bestimmung der Temperaturwechselbeständigkeit von dichten geformten feuerfesten Erzeugnissen durch Abschrecken an Luft fest, für die nachgewiesen wurde, dass sie, verglichen mit dem Verhalten von feuerfesten Erzeugnissen in Ofenauskleidungen, die zuverlässigsten Ergebnisse liefern. Verfahren B ist auch auf ungeformte feuerfeste Werkstoffe anwendbar.
Méthodes d'essai des produits réfractaires façonnés denses - Partie 11 : Détermination de la résistance au choc thermique
La présente Norme européenne définit deux méthodes alternatives permettant de déterminer la résistance aux chocs thermiques des matériaux réfractaires façonnés denses par une méthode de trempe à l’air ; il a été établi que, par comparaison avec le comportement des réfractaires placés dans les revêtements de fours, ces méthodes donnaient des résultats plus fiables.
La méthode B peut aussi être appliquée aux matériaux réfractaires non façonnés.
Metode preskušanja gosto oblikovanih ognjevzdržnih izdelkov - 11. del: Ugotavljanje odpornosti proti hitrim temperaturnim spremembam
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Methods of test for dense shaped refractory products - Part 11: Determination of resistance to thermal shockMetode preskušanja gosto oblikovanih ognjevzdržnih izdelkov - 11. del: Ugotavljanje odpornosti proti hitrim temperaturnim spremembamMéthodes d'essai des produits réfractaires façonnés denses - Partie 11 : Détermination de la résistance au choc thermiquePrüfverfahen für dichte geformte feuerfeste Erzeugnisse - Teil 11: Bestimmung der TemperaturwechselbeständigkeitTa slovenski standard je istoveten z:EN 993-11:2007SIST EN 993-11:2008en,fr,de81.080ICS:SIST-TS CEN/TS 993-11:20041DGRPHãþDSLOVENSKI
STANDARDSIST EN 993-11:200801-marec-2008
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 993-11December 2007ICS 81.080Supersedes CEN/TS 993-11:2003
English VersionMethods of test for dense shaped refractory products - Part 11:Determination of resistance to thermal shockProduits réfractaires façonnés denses - Partie 11:Détermination de la résistance au choc thermiquePrüfverfahen für dichte geformte feuerfeste Erzeugnisse -Teil 11: Bestimmung der TemperaturwechselbeständigkeitThis European Standard was approved by CEN on 15 November 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 993-11:2007: E
EN 993-11:2007 (E) 2 Contents Page Foreword.3 Introduction.5 1 Scope.6 2 Normative references.6 3 Terms and definitions.6 4 Principle.6 4.1 Method A.6 4.2 Method B.6 5 Apparatus.7 6 Test pieces.7 6.1 Number of test pieces.7 6.2 Preparation of test pieces.7 7 Procedure.8 7.1 Heating.8 7.2 Cooling.8 7.3 Measurement.8 8 Expression of results.9 8.1 Method A.9 8.2 Method B.9 9 Test report.9 Bibliography.11
EN 993-11:2007 (E) 3 Foreword This document (EN 993-11:2007) has been prepared by Technical Committee CEN/TC 187 “Refractory products and materials”, the secretariat of which is held by BSI. 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 June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. This document supersedes CEN/TS 993-11:2003. EN 993 'Methods of test for dense shaped refractory products' consists of 20 Parts: Part 1: Determination of bulk density, apparent porosity and true porosity Part 2: Determination of true density Part 3: Test methods for carbon-containing refractories Part 4: Determination of permeability to gases Part 5: Determination of cold crushing strength Part 6: Determination of modulus of rupture at ambient temperature Part 7: Determination of modulus of rupture at elevated temperatures Part 8: Determination of refractoriness-under-load Part 9: Determination of creep in compression Part 10: Determination of permanent change in dimensions on heating Part 11: Determination of resistance to thermal shock
Part 12: Determination of pyrometric cone equivalent (refractoriness) Part 13: Specification for pyrometric reference cones for laboratory use Part 14: Determination of thermal conductivity by the hot-wire (cross-array) method Part 15: Determination of thermal conductivity by the hot-wire (parallel) method Part 16: Determination of resistance to sulfuric acid Part 17: Determination of bulk density of granular materials by the mercury method with vacuum Part 18: Determination of bulk density of granular materials by the water method with vacuum Part 19: Determination of thermal expansion by a differential method Part 20: Determination of resistance to abrasion at ambient temperature
EN 993-11:2007 (E) 4 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
EN 993-11:2007 (E) 5 Introduction Thermal shock of refractory materials used in furnaces is influenced by three main factors: brick dimensions; heating/cooling conditions; material properties. Thermal shock tests are usually intended to test material properties. This is done by standardizing brick dimensions and heating conditions through which a relative order of the quality of different types of bricks can be established. However, in case of thermal shock, this can lead to complications in the field of engineering. The major complication is that, depending on the type of heating conditions, various material properties are involved.
This can be best illustrated on the basis of thermal stress parameters, which are a measure for critical crack initiation. Table 1 — Type of heating condition Hot face condition Stress parameter Example sudden temperature jump ε /α filling of metallurgical vessels constant heat flow into brick λ .ε /α Furnace preheating constant heating rate λ /(ρ. cp ) .ε /α Controlled preheating where ε
maximum allowable deformation; α
coefficient of expansion; λ
thermal conductivity; ρ
bulk density; cp
specific heat.
EN 993-11:2007 (E) 6 1 Scope This European Standard describes two a
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