DIN EN 10240-1998 Internal and or external protective coatings for steel tubes - Specification for hot dip galvanized coatings applied in automatic plants German version EN 10240 1.pdf

1、DEUTSCHE NORM Februarv 1998 DIN EN 10240 Internal and/or external protective coatings for steel tubes Specification for hot dip galvanized coatings applied in automatic plants Enalish version of DIN EN 10240 ICs 23.040.1 O; 25.220.40; 77.140.75 Supersedes DIN 2444, January 1984 edition. Descriptors:

2、 Coatings, steel pipes. Innere und/oder uere Schutzberzge fr Stahlrohre - Festlegungen fr durch Schmelztauchverzinken in automatisierten Anlagen hergestellte berzge European Standard EN 10240 : 1997 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This stand

3、ard has been prepared by ECISS/TC 29. The responsible German body involved in its preparation was the Normenausschu Rohre, Rohrverbindungen und Rohrleitungen (Pipes, Pipe Joints and Pipelines Standards Committee). Amendments DIN 2444, January 1984 edition, has been superseded by the specifications o

4、f EN 10240. Previous editions DIN 2444: 1963-03, 1972-08, 1978-07, 1984-01. EN comprises 17 pages. No pari of this standard may be reproduced without the prior permission of V Deutsches Institut fr Nonung e. V., Berlin. Luth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Sta

5、ndards (DIN-Normen). Ref. No. DIN EN 10240 : 1998-0 English price group 11 Sales No. 11 11 07.98 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 10240 December 1997 ICs 23.040.1 O; 25.220.40; 77.1 40.75 Descriptors: Coatings, steel pipes. English version Internal and/or external protective coat

6、ings for steel tubes Specification for hot dip galvanized coatings applied in automatic plants Revtements intrieurs eVou extrieurs des tubes en acier - Spcifications pour revtements chaud sur des lignes automatiques Innere und/oder uere Schutzber- Zge fr Stahlrohre - Festlegungen fr durch Schmelztau

7、chverzinken in automatisierten Anlagen hergestellte berzge This European Standard was approved by CEN on 1997-08-09. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any

8、 alteration. Up-to-date lists and bibliographical references concerning such national stand- ards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by

9、 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 Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,

10、 Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 8-1050 Brussels O 1997. CEN - All righ

11、ts of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 10240 : 1997 E Page 2 EN 10240 : 1997 Contents Foreword . 3 1 Scope 4 2 Normative references . 4 3 Definitions . 5 4 Designation of coating quality . 6 5 Information to be supplied by the purchas

12、er 6 6 Hot dip galvanizing process . 7 7 General requirements of the coating 7 8 Special requirements of the coating . 8 9 Inspection 10 io Sampling . 10 11 Inspection and test methods . 11 12 Post galvanizing treatment 13 13 Marking 14 Annex A (normative) Condition of the tube to be coated 14 Annex

13、 B (normative) Method of determination of the local coating thickness using the magnetic method (IS0 2178) . 14 Annex C (normative) Method of determination of the mass of the coating per unit Annex D (informative) Guidelines for the galvanizers procedure for non-specific area using the gravimetric m

14、ethod (EN IS0 1460) . 15 inspection and testing of coating quality A.1 in accordance with EN 10021 - Frequency of inspection and testing . 17 Page 3 EN 10240 : 1997 Foreword This European Standard has -een prepared by Technical Committee ECISSTTC 29 “Steel tubes and fittings for steel tubes“, the se

15、cretariat of which is held by UNI. 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 1998, and conflicting national standards shall be withdrawn at the latest by June 1998. The European Committ

16、ee for Iron and Steel Standardization (ECISS) instructed the Technical Committee ECISS/TC 29 to draw up a European Standard for hot dip galvanized coatings for steel tubes. This task has been undertaken by the sub-committee ECISSTTC 29/SC 4, the secretariat of which is held by the Association Franai

17、se de Normalisation (AFNOR). The sub-committee has recognised that the quality required of a hot dip galvanized coating depends on the intended application of the steel tubes and it must relate to the capabilities of the process by which the coating is applied. Consequently this standard specifies a

18、 number of coating qualities each with different coating requirements for hot dip galvanized coatings applied to steel tubes in automatic plants The purchaser is required to specify one of these coating qualities in his enquiry and order. In respect of potential adverse effects on the quality of wat

19、er intended for human consumption, caused by the product covered by this standard : 1) this standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA ; 2) it should be noted that, while awaiting the adoption of verifiable

20、 European criteria, existing national regulations concerning the use andior the characteristics of this product remain in force. No EURONORM is replaced by this European Standard. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bo

21、und to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Page 4 EN 10240 : 1997 1 Scope 1.1 This European Standard speci

22、fies the requirements and tests for hot dip galvanized coatings applied to steel tubes hot dip galvanized in automatic plants (see 3.9) for the following : a) gas and water installations, including water intended for human consumption ; b) other applications e.g. scaffold tubes, structural hollow se

23、ctions. NOTE 1 : Subsequently in this European Standard, the term “tube“ includes “hollow section“. NOTE 2 Hot dip galvanized coatings for steel tubes fabricated (see 3.10) subsequent to manufacture or hot dip galvanized in non-automatic plants are specified in prEN IS0 1461 Hot dip galvanized coati

24、ngs for steel tube fittings and accessories are within the scope of sub-committee ECISSTC 29iSC 3. 1.2 requirements specified in EN 10021 apply. In addition to the requirements of this European Standard the general technical delivery 2 Normative references This European Standard incorporates by date

25、d 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 dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard o

26、nly when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 1179 Zinc and zinc alloys - Primary zinc EN 10021 General technical delivery requirements for steel and iron products EN 10204 Metallic products - Types of inspe

27、ction documents (including amendment AI : 1995) EN 10232 Metallic materials - Tube (in full section) - Bend test EN 10233 Metallic materials - Tube - Flattening test prEN 10266) Steel tubes, fittings and structural hollow sections - Definitions and symbols for use in product standards EN IS0 1460 Me

28、tallic coatings - Hot dip galvanized coatings on ferrous materials - Gravimetric determination of the mass per unit area prEN IS0 14611) Hot dip galvanized coatings on fabricated ferrous products - Specification In preparation ; until this document is published as a European Standard, a correspondin

29、g national standard should be agreed at the time of enquiry and order. Page 5 EN 10240 : 1997 EN IS0 1463 Metallic and oxide coatings - Measurement of coating thickness - Microscopical method EN IS0 9001 Quality systems - Model for quality assurance in design, development, production, installation a

30、nd servicing EN IS0 9002 Quality systems - Model for quality assurance in production, installation and servicing IS0 2178 Non-magnetic coatings on magnetic substrates - Measurement of coating thickness - Magnetic method 3 Definitions For the purpose of this European Standard, the following definitio

31、ns apply , in addition to those of prEN 10266 : 3.1 hot dip galvanizing Formation of a coating of zinc and/or zinc-iron alloys produced by dipping prepared steel in molten zinc. 3.2 The coating consisting of zinc-iron alloys usually covered by zinc, obtained by hot dip galvanizing. hot dip galvanize

32、d coating (subsequently referred to as “the coating“) 3.3 coating mass The total mass of zinc andlor zinc-iron alloys per unit area of surface (expressed in grammes per square metre, g/m2). 3.4 coating thickness The total thickness of zinc and/or zinc-iron alloys (expressed in micrometers, pm). 3.5

33、local coating thickness The mean value of coating thickness obtained from the specified number of measurements within a reference area for a magnetic test or determined from the single value from a gravimetric test. 3.6 local coating mass The value of coating mass obtained from a single gravimetric

34、test. Page 6 EN 10240 : 1997 3.7 significant surface The whole of the inside and/or outside surfaces of the tube depending upon the application, but excluding the end faces. 3.8 reference area An area of significant surface within which a specified number of single measurements of coating thickness

35、is to be made. 3.9 automatic plant A plant in which tubes are hot dip galvanized and mechanically handled individually at withdrawal from the hot dip galvanizing bath. 3.10 fabricated Manipulated e.g. welded, bent, assembled. 4 Designation of coating quality For the coatings specified in this Europe

36、an Standard, the quality designation shall consist of one of the following to identify the intended application of the tube : a) A for gas and water installations, including water intended for human consumption ; b) B for other applications ; followed by a full stop and a number to identify the spec

37、ial requirements for that application (see 8.2.1 and table I), e.g. A.3. 5 information to be supplied by the purchaser 5.1 Mandatory information The following information, when appropriate, shall be supplied by the purchaser to the galvanizer at the time of enquiry and order : a) the number of this

38、European standard ; b) the designation of coating quality (see clause 4) ; c) the product standard to which the tubes to be galvanized were manufactured. Page 7 EN 10240 : 1997 5.2 Options A number of options are permitted by this European Standard, and they are listed below with the appropriate cla

39、use references. Where the purchaser identifies an option he shall include it in his enquiry and order. In the event that the purchaser does not indicate his wish to implement an option, the galvanizer shall supply in accordance with the base specification : 1) the minimum local coating thickness on

40、the outside surface is specified. This option applies to coating qualities A. 1, A.2 and A.3 only, and the purchaser shall indicate the minimum local coating thickness required (see 8.2.1) ; 2) the chemical composition of the coating shall comply with 8.2.lf. This option applies to coating qualities

41、 A.2 and A.3 only 3) the minimum local coating thickness required is in excess of 55 pm. This option applies to coating quality B.l only and the purchaser shall indicate the minimum coating thickness required (see 8.2.2), e.g. as specified in prEN IS0 1461 ; 4) the type of post galvanizing treatment

42、 is specified. The purchaser shall indicate the type of post galvanizing treatment required (see clause 12) ; 5) a post galvanizing treatment is precluded (see clause 12). 6 Hot dip galvanizing process 6.1 operate a quality system in accordance with EN IS0 9002. The galvanizer and the stockist, wher

43、e products are supplied through a stockist, shall NOTE : This requirement is also fulfilled by a quality system in accordance with EN IS0 9001. 6.2 The zinc added to the galvanizing bath shall contain a total of impurities (other than iron and tin) specified in EN 1179 not exceeding 1,5 %. 7 General

44、 requirements of the coating NOTE : The surface quality, thickness and adhesion of the coating may be influenced by the surface condition of the tubes to be coated (see annex A). 7.1 Surface The coating on both the inside and outside surfaces shall be continuous, smooth and free from flux residues o

45、n the significant surface. NOTE 1 White marks on the surface of the coating (commonly known as “wet storage stain“) are permitted if the requirements for the coating thickness are met. Page 8 EN 10240 : 1997 7.2 Thickness The coating thickness on the significant surface (inside andlor outside as app

46、licable) shall comply with the requirements of the coating quality specified (see 8.2). NOTE : Service life increases with increase in coating thickness, but thicker coatings are more susceptible to mechanical damage. 7.3 Adhesion When tested in accordance with 11.4.2 or 11.4.3 the coating shall sho

47、w no evidence of flaking on the significant surface. In addition the coating shall show no evidence of cracking on the significant surface when subjected to the bend test. Flaking adjacent to cut faces or at the corners of square or rectangular tubes shall not be cause for rejection. 8 Special requi

48、rements of the coating 8.1 All coatings have special requirements which are related to the application of the tube. These are detailed in the coating qualities specified in 8.2 one of which shall be specified by the purchaser in his enquiry and order (see 5.1). 8.2 Requirements of coating quality 8.

49、2.1 Coating qualities, A.l, A.2 and A.3 a) the surface of the coating on the inside surface shall be as smooth as can be achieved by steam blowing. NOTE 1 : Steam blowing produces a smoother surface on tubes of outside diameter 21,3 mm up to and including 88,9 mm than on tubes of other sizes. NOTE 2 : Some variations may occur in the surface condition of the coating at the points where the tube is held whilst steam blowing and within 50 mm of the tube ends ; b) the minimum local coating thickness on the inside surface shall be as specified in table I ; c) un