NF-EN-10253-2-2007-ENG.pdf
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1、EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 10253-2 October 2007 ICS 77.140.45; 23.040.40 English Version Butt-welding pipe fittings - Part 2: Non alloy and ferritic alloy steels with specific inspection requirements Raccords souder bout bout - Partie 2: Aciers non allis et aciers ferritiqu
2、es allis avec contrle spcifique Formstcke zum Einschweien - Teil 2: Unlegierte und legierte ferritische Sthle mit besonderen Prfanforderungen This European Standard was approved by CEN on 18 August 2007. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the co
3、nditions 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 CEN Management Centre or to any CEN member. This European Standard exists in t
4、hree 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 Centre has the same status as the official versions. CEN members are the national standards bodies o
5、f 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. EUROPEA
6、N COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10253-2:2007: E EN 10253-2:200
7、7 (E) 2 Contents Foreword4 1 Scope 5 2 Normative references5 3 Terms and definitions .7 4 Symbols9 5 Designations 10 5.1 Designation of steel grades10 5.2 Designation of fittings.10 6 Information to be supplied by the purchaser .10 6.1 Mandatory information10 6.2 Options .11 6.3 Examples of an order
8、 12 7 Resistance to internal pressure.12 7.1 General12 7.2 Fittings of type A12 7.3 Fittings of type B13 8 Manufacturing process .13 8.1 Steelmaking process.13 8.2 Product making process for fittings and heat treatment.13 9 Technical requirements 17 9.1 General17 9.2 Chemical composition 17 9.3 Mech
9、anical properties.19 9.4 Weldability24 10 Appearance and internal soundness.24 11 Dimensions and tolerances25 11.1 Dimensions.25 11.2 Dimensional tolerances 39 11.3 End finishing43 12 Inspection.44 12.1 Type of inspection.44 12.2 Inspection documents.44 12.3 Summary of inspection and testing.45 13 S
10、ampling.46 EN 10253-2:2007 (E) 3 13.1 Frequency of tests.46 13.2 Preparation of samples and test pieces47 14 Test methods.48 14.1 Chemical analysis .48 14.2 Tensile test on the base material.49 14.3 Transverse tensile test on the weld.49 14.4 Hardness test.49 14.5 Weld bend test.49 14.6 Impact testi
11、ng 49 14.7 Dimensional testing 50 14.8 Visual inspection.50 14.9 Non destructive testing.50 14.10 Material identification53 15 Marking.53 15.1 Marking to be applied53 15.2 Methods54 16 Protection and packaging 54 Annex A (informative) Determination of pressure factors and wall thickness.55 Annex B (
12、informative) Pressure factor tables for Fittings of type A79 Annex C (informative) Wall thickness tables for Fittings of type B.97 Annex D (informative) Recommended heat treatment temperatures 122 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU
13、 Directive 97/23/EC123 Bibliography125 EN 10253-2:2007 (E) 4 Foreword This document (EN 10253-2:2007) has been prepared by Technical Committee ECISS/TC 29 “Steel tubes and fittings for steel tubes”, the secretariat of which is held by UNI/UNSIDER. This European Standard shall be given the status of
14、a national standard, either by publication of an identical text or by endorsement, at the latest by May 2008, and conflicting national standards shall be withdrawn at the latest by May 2008. This document has been prepared under a mandate given to CEN by the European Commission and the European Free
15、 Trade Association, and supports essential requirements of EU Directive (97/23/EC). For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document. EN 10253 comprises a series of European Standards about Butt-welding pipe fittings, namely: Part 1 : Wrought c
16、arbon steel for general use and without specific inspection requirements Part 2 : Non alloy and ferritic alloy steels with specific inspection requirements Part 3 : Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements Part 4 : Wrought austenit
17、ic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements In writing this European Standard the competent committee recognized that there are two broad types of products commonly used, and decided to reflect these in the standard by differentiating between two parts.
18、 EN 10253-1 describes fittings without formal reference to the pressure resistance, which are not intended to be used in applications covered by the Pressure Equipment Directive (97/23/EC). EN 10253-2 defines two types of fittings : Type A fittings have the same wall thickness at the welding ends an
19、d at the body of the fitting than a pipe having the same specified wall thickness. Their resistance to internal pressure is, in general, less than that of a straight pipe with the same dimensions. Type B fittings showing increased wall thickness at the body of the fitting are designed to resist the
20、same internal pressure as a straight pipe with same dimensions. These two types of fittings are intended to be used in applications covered by the EU Directive 97/23/EC. According to this Directive and further interpretation guidelines (e.g. guideline 7/19), seamless fittings are considered as mater
21、ials whereas welded fittings are considered as components. Therefore, in some areas of this European Standard, provisions for seamless and welded fittings are different. The selection of steel type and requirement level depend on many factors; the properties of the fluid to be conveyed, the service
22、conditions, the design code and any statutory requirements should all be taken into consideration. Therefore this standard gives no detailed guidelines for the application of different parts. It is the ultimate responsibility of the user to select the appropriate part for the intended application. A
23、ttention 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 patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations
24、 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, S
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