EN ISO 13807-2009 en Vitreous and porcelain enamels - Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industry《釉瓷和搪瓷 化学工业用瓷层热冲.pdf

1、BRITISH STANDARD Vitreous and porcelain enamels Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industry ICS 25.220.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN ISO 13807:2009 Incorporating Technical Corrigendum

2、 October 2000This British Standard published under the authority of the Standards Committee and comes into effect on 15 February 2001 National foreword Amendments/corrigenda issued since publication This British Standard is the UK implementation of EN ISO 13807:2009. It is identical with ISO 13807:1

3、999, incorporating technical corrigendum The UK participation in its preparation was entrusted to Technical Committee STI/36, Vitreous enamel coatings. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all

4、the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amd. No. Date Comments 13024 Technical Corrigendum July 2001 Implementation of ISO corrigendum October 2000. In 7.1 the last se

5、ntence in the paragraph after Figure 1 has been replaced This corrigendum renumbers BS ISO 13807:1999 as BS EN ISO 13807:2009ISBN 978 0 580 63561 8 BS EN ISO 13807:2009 BSI 2009 was 30 June 2009 October 2000. It supersedes BS ISO 13807:1999 which is withdrawn.EUROPEAN STANDARD NORME EUROPENNE EUROPI

6、SCHE NORM EN ISO 13807 January 2009 ICS 25.220.50 English Version Vitreous and porcelain enamels - Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industry (ISO 13807:1999, including Cor 1:2000) maux vitrifis - Dtermination de la temprature de fi

7、ssuration par choc thermique dmaux pour lindustrie chimique (ISO 13807:1999, Cor 1:2000 inclus) Aluminium-Emails - Bestimmung der Rissbildungstemperatur von Chemie-Emails beim Abschreckversuch (ISO 13807:1999, einschlielich Cor 1:2000) This European Standard was approved by CEN on 13 December 2008.

8、CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions 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 a

9、pplication 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Cent

10、re has the same status as the official 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, Polan

11、d, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by an

12、y means reserved worldwide for CEN national Members. Ref. No. EN ISO 13807:2009: E Foreword The text of ISO 13807:1999, including Cor 1:2000 has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” of the International Organization for Standardization (ISO) and has

13、 been taken over as EN ISO 13807:2009 by Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” 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 lates

14、t by July 2009, and conflicting national standards shall be withdrawn at the latest by July 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such pat

15、ent rights. 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, Irel

16、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 13807:1999, including Cor 1:2000 has been approved by CEN as a EN ISO 13807:2009 without any mod

17、ification. EN ISO 13807:2009 BS 1 1 Vitreous and porcelain enamels Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industry 1 Scope This International Standard specifies a test method for the determination of the crack formation temperature of en

18、amels for the chemical industry by subjecting enamelled steel specimens to thermal shock using cold water. The value of the crack formation temperature measured according to this test method is not valid for the finished component (see annex A). It is a parameter of vitreous and porcelain enamels fo

19、r comparing the relative quality of different enamel formulations. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of,

20、 any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative docu

21、ment referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 2746, Vitreous and porcelain enamels Enamelled articles for service under highly corrosive conditions High voltage test. ISO 2808, Paints and varnishes Determination of film thickness.

22、 IS0 3819, Laboratory glassware Beakers. ISO 10141, Vitreous and porcelain enamels Vocabulary. 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 10141 as well as the following apply. 3.1 crack formation temperature thermal shock temperatu

23、re at which the first damage to the enamel occurs in the form of cracks and/or chipping 3.2 thermal shock temperature temperature of the specimen immediately before quenching with cold water 9 BS EN ISO 13807:2002 4 Designation The test method for the determination of the crack formation temperature

24、 of enamels for the chemical industry by the thermal shock test described in this Intemational Standard is designated as follows: Test ISO 13807 5P r i n c i p l e The specimen is heated to the thermal shock temperature in a drying oven. After reaching the thermal shock temperature, the enamelled su

25、rface is covered by water at a temperature between 10 C and 30 C. Then the specimen is dried and visually examined for damage. To make cracks visible, the entire enamel surface is sprayed with electrostatically charged talcum powder. If no damage to the enamel is found after the first thermal shock

26、test, the test shall be repeated at a thermal shock temperature 10 C higher than in the previous test. 6 Apparatus 6.1 Drying oven, capable of maintaining temperatures of at least 300 C. 6.2 Low-form beaker, having a capacity of 2 000 ml meeting the requirements of ISO 3819. 6.3 Spray gun, equipped

27、with a hard-rubber nozzle for electrostatically charging the talcum powder. 7 Specimens 7.1 Shape and preparation of specimens Specimens shall be square sheet metal plates with a thickness of at least 10 mm and an edge length of 150 mm that have been enamelled on one side. Alternatively, specimens a

28、s shown in Figure 1 made of 10MnTi3 low-alloyed enamelling structural steel may be used. The steel shall have the following nominal composition (% mass fraction): carbon,u 0,12 %; manganese, 0,40 % to 1,00 %; titanium 0,10 % to 0,16 %; phosphorusu 0,035 %; sulphur,u 0,030 %. During the enamelling pr

29、ocess, these specimens shall be held in the horizontal position by means of a rod inserted in the 5 mm hole. The ground coat shall cover the entire surface. The cover coat may be applied only to the top and convex surface (radius 8 mm). NOTE Besides the determination of crack formation temperature,

30、enamelled specimens shown in Figure 1 may also be used for corrosion tests in closed systems according to ISO 13806. EN ISO 13807:2009 BS3 Dimensions in millimetres Roughness values in micrometres Figure 1 Steel specimen for determination of the crack formation temperature of enamels by thermal shoc

31、k Prepare the specimens by the same enamelling process used for the enamelled product, including the pretreatment, type of ground and cover coat, application technique, firing temperature and thickness of the ground coat. After each firing step, the specimens are removed from the oven and may be coo

32、led in air. However, the specimens shall be submitted to controlled cooling after the last coating or directly after the last firing. Heat the specimens up to 800 C in an oven, maintain this temperature for at least 20 min, then cool to, 250 C at a co o l in grateo fu1 C/mi n(se ea n ne xA ). The ov

33、erall thickness of the enamel measured by the method given in ISO 2808 shall be between 0,8 mm and 1,4 mm. The finished enamel coating shall be free from defects. This shall be checked visually, as well as with the high voltage test at 12 kV described in ISO 2746. Specimens of other shapes or manufa

34、cture may be used, when specified by the purchaser. The use of specimens having different shapes or manufacture shall be noted in the test report. 7.2 Number of specimens Two specimens of the same type shall be used for each determination. 8 Procedure 8.1 Place the two enamelled specimens with the e

35、namelled surface upwards in the drying oven (6.1) heated to the thermal shock temperature. The thermal shock temperature shall be about 20 C below the expected crack formation temperature. If necessary, determine the crack formation temperature by a preliminary test. 8.2 Determine by a preliminary t

36、est, the time span necessary for heating the specimens to the thermal shock temperature. After the specimens have reached the thermal shock temperature, open the drying oven (6.1) and remove one specimen by means of a fork or other tool, without touching the enamel surface. Hold the specimen horizon

37、tally and cover the centre of it by pouring 2 I of water at a temperature between 10 C and 30 C, pouring the water at a rate of approximately 100 ml/s. From the moment the drying oven (6.1) is opened until the cold water is poured on to the specimen, no more than 3 s shall elapse. 6 u EN ISO 13807:2

38、009 BS4 8.3 After the first specimen has been removed from the drying oven (6.1), leave the second specimen in the oven until it has again reached the thermal shock temperature, plus an additional 5 min. Then repeat the thermal shock step with the second specimen, by the procedure described in 8.2.

39、8.4 Check the dried specimens visually for damage to the enamel. To make cracks easier to detect, spray the enamel with electrostatically charged talcum powder using the spray gun (6.3). This technique will make even fine cracks easy to detect. 8.5 If no damage to the enamel is detected on one or bo

40、th specimens after the thermal shock test, repeat the test on the same specimens at a thermal shock temperature that is 10 C higher than in the first test. 8.6 If the difference in the crack formation temperature as determined by the above procedure is greater than 10 C, the test shall be repeated w

41、ith two new specimens. 9 Expression of results Average the crack formation temperatures that do not differ by more than 10 C. 10 Test report The test report shall include the following information: a) the type of enamel tested; b) the designation (see clause 4) of this test method, i.e. Test ISO 138

42、07; c) the thickness of the enamel coating; d) the material code or designation of the basis metal; e) if applicable, the shape of the specimen, if specified by the purchaser (see clause 7); f) the description of the damage to the enamel coating; g) the individual values of the crack formation tempe

43、ratures, in C; h) the arithmetic mean of the crack formation temperature, in C. EN ISO 13807:2009 BS5 Annex A (informative) Explanatory notes In the case of vitreous enamelling, the two components, enamel and metal, are firmly fused together by means of a mechanical and chemical bond. As a result of

44、 the different thermal expansion and softening characteristics of enamel and metal, temperature-dependent stresses develop in the composite. The components of the composite are generally designed such that compressive stresses are present in the melted-on enamel coating. In the case of vitreous enam

45、elling, four different types of thermal shock are known: a) cold-shock on the enamel side; b) heat shock on the metal side; c) heat shock on the enamel side; d) cold shock on the metal side. Since cold shock on the enamel side with cold water is the most critical type, this test is specified in this

46、 International Standard. The crack formation temperature of enamel as determined by thermal shock testing is a characteristic of the composite material. No conclusions should be drawn from the results of this thermal shock test about the resistance to cold of an enamelled product. In practice, the c

47、rack formation temperature is influenced by stresses due to manufacture, that originate from welded joints or from non-uniform cooling from the enamelling temperature. The crack formation temperature is also influenced by mechanical deformation occurring after enamelling as a result of welding on th

48、e double jacket of the vessel or by support forces introduced by the container support structure. In addition, stresses during service that occur at a particular production stage, e.g., compressive stress on the inner vessel or jacket, may affect the crack formation temperature. Consequently, the th

49、ermal shock resistance guaranteed by the enamel manufacturer for the enamelled product will always be considerably lower than the crack formation temperature determined in accordance with this International Standard. The controlled cooling of specimens after enamelling (see 7.1) reduces the stresses that are created by uncontrolled cooling in air. If cooling is controlled, the measured crack formation temperatures of different enamels can be compared. Specimens coated with the identical enamel that are rapidly cooled in air without c