1、BSI Standards PublicationBS EN 4721:2014Aerospace series Steel X4CrNiMo16-5-1 (1.4418) Air melted and electroslag r e m e l t e d ( E S R ) H a r d e n e d and tempered Bar De 200 mm 900 MPa Rm 1 050 MPaBS EN 4721:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation o
2、f EN 4721:2014. The UK participation in its preparation was entrusted to TechnicalCommittee ACE/61/-/15, Steels for Aerospace Purposes.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary prov
3、isions of a contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 84539 0ICS 49.025.10Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was publish
4、ed under the authority of the Standards Policy and Strategy Committee on 31 October 2014.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 4721:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4721 October 2014 ICS 49.025.10 English Version Aerospace series - St
5、eel X4CrNiMo16-5-1 (1.4418) - Air melted and electroslag remelted (ESR) - Hardened and tempered - Bar -De 200 mm - 900 MPa Rm 1 050 MPa Srie arospatiale - Acier X4CrNiMo16-5-1 (1.4418) - labor lair - Tremp et revenu - Barres - De 200 mm -900 MPa Rm 1 050 MPa Luft- und Raumfahrt - Stahl X4CrNiMo16-5-
6、1 (1.4418) - Lufterschmolzen - Gehrtet- und angelassen - Stangen - De 200 mm -900 MPa Rm 1 050 MPa This European Standard was approved by CEN on 4 January 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
7、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-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, Fr
8、ench, 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-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgari
9、a, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turke
10、y and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Re
11、f. No. EN 4721:2014 EBS EN 4721:2014EN 4721:2014 (E)2 Contents Page Foreword . 3 Introduction 4 1 Scope . 5 2 Normative references . 5 BS EN 4721:2014 EN 4721:2014 (E)3 Foreword This document (EN 4721:2014) has been prepared by the Aerospace and Defence Industries Association ofEurope - Standardizat
12、ion (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard hasreceived the approval of the National Associations and the Official Services of the member countries of ASD,prior to its presentation to CEN. This European Standard shall be given
13、 the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by April 2015, and conflicting national standards shall be withdrawn atthe latest by April 2015. Attention is drawn to the possibility that some of the elements of this document may be the
14、subject of patentrights. 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 of the followingcountries are bound to implement this European Standard: Austria, Belgium,
15、Bulgaria, Croatia, Cyprus,Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, T
16、urkey and the UnitedKingdom. BS EN 4721:2014EN 4721:2014 (E)4 Introduction This standard is part of the series of EN metallic material standards for aerospace applications. The generalorganization of this series is described in EN 4258. This standard has been prepared in accordance with EN 4500-005.
17、 BS EN 4721:2014EN 4721:2014 (E)5 1 Scope This European Standard specifies the requirements relating to: Steel X4CrNiMo16-5-1 (1.4418) Air melted and electroslag remelted (ESR) Hardened and temperedBar De 200 mm 900 MPa Rm 1 050 MPa for aerospace applications. NOTE Other common designation: AIR: Z 8
18、 CND 17-04. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and areindispensable for its application. For dated references, only the edition cited applies. For undated references,the latest edition of the referenced document (including
19、 any amendments) applies. EN 2043, Aerospace series Metallic materials General requirements for semi-finished productqualification (excluding forgings and castings) EN 2951, Aerospace series Metallic materials Test method Micrographic determination of content ofnon-metallic inclusions 1)EN 4050-4, A
20、erospace series Test method for metallic materials Ultrasonic inspection of bars, plates,forging stock and forgings Part 4: Acceptance criteria EN 4258, Aerospace series Metallic materials General organization of standardization Linksbetween types of EN standards and their use EN 4500-005, Aerospace
21、 series Metallic materials Rules for drafting and presentation of materialstandards Part 005: Specific rules for steelsEN 4700-002, Aerospace series Steel and heat resisting alloys Wrought products Technicalspecification Part 002: Bar and sectionEN ISO 643, Steels Micrographic determination of the a
22、pparent grain size (ISO 643:2003) AMS 2315, Determination of delta ferrite content 2) 1)Published as ASD-STAN Prestandard at the date of publication of this standard (www.asd-stan.org). 2)Published as SAE National (US) Society of Automotive Engineers (http:/www.sae.org/). BS EN 4721:2014EN 4721:2014
23、 (E) 6 1 Material designation Steel X4CrNiMo16-5-1 (1.4418) 2 Chemical composition % Element C Si Mn P aS aN Cr Mo Ni Fe min. 0,020 15,00 0,80 4,00 Base max. 0,06 0,70 1,50 0,030 0,005 17,00 1,50 6,00 3 Method of melting Air melted and electroslag remelted (ESR) 4.1 Form Bar 4.2 Method of production
24、 4.3 Limit dimension(s) mm De 200 mm 5 Technical specification EN 4700-002 6.1 Delivery condition Annealed Hardened and tempered Heat treatment 1 010 C 1 060 C / OQ or WQ b+ Tempered 580 C 610 C 6.2 Delivery condition code A U 7 Use condition Hardened and tempered Delivery condition Heat treatment 1
25、 010 C 1 060 C / OQ or WQ b+ Tempered 580 C 610 C Characteristics 8.1 Test sample(s) 8.2 Test piece(s) 8.3 Heat treatment Delivery condition Use condition 9 Dimensions concerned mm De 200 De 75 75 De 200 10 Thickness of cladding on each face % 11 Direction of test piece L LT 12 T Temperature C Ambie
26、nt Ambient Ambient 13 Proof stress Rp0,2MPa 700 700 14 Strength RmMPa 900 Rm 1 050 900 Rm 1 050 15 Elongation A % 16 12 16 Reduction of area Z % 17 Hardness HBW 293 269 HBW 331 269 HBW 331 18 Shear strength RcMPa 19 Bending k 20 Impact strength KV J 120 J at 20 C Notch direction T 70 J at 40 C Notch
27、 direction T 60 J at 20 C Notch direction L 35 J at 40C Notch direction L 21 C Temperature C 22 Time h 23 Stress aMPa 24 Elongation a % 25 Rupture stress RMPa 26 Elongation at rupture A % 27 Notes (see line 98) a, bBS EN 4721:2014EN 4721:2014 (E) 7 30 Microstructure EN 4700-002 1 See AMS 2315.7 The
28、ferrite content shall not exceed 5 %34 Grain size EN 4700-002 1 See EN ISO 643. 7 G 5 or finer 44 External defects EN 4700-002 50 Cleanliness/inclusion content EN 4700-002 (micro cleanness) 1 See EN 2951. 7 Category 4 61 Internal defects EN 4700-002 1 See EN 4050-4. 7 Class 5 95 Marking inspection E
29、N 4700-002 96 Dimensional inspection EN 4700-002 98 Notes aFor specific welding applications (e.g. high power beam), and after agreement between manufacturer and purchaser, S+P should be equal or less than 0,023 %. bAir quenching may be used for De 20 mm. 99 Typical use BS EN 4721:2014EN 4721:2014 (
30、E) 8 100 Product qualification EN 2043 Qualification programme to be agreed between manufacturer and purchaser. This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated
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