1、BSI Standards PublicationBS EN 4720:2014Aerospace 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 1 150 MPa Rm 1 300 MPaBS EN 4720:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation
2、 of EN 4720:2014. 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 pr
3、ovisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 84538 3ICS 49.025.10Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was publi
4、shed 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 4720:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4720 October 2014 ICS 49.025.10 English Version Aerospace series -
5、Steel X4CrNiMo16-5-1 (1.4418) - Air melted and electroslag remelted (ESR) - Hardened and tempered - Bar -De 200 mm - 1 150 MPa Rm 1 300 MPa Srie arospatiale - Acier X4CrNiMo16-5-1 (1.4418) - labor lair - Tremp et revenu - Barres - De 200 mm -1 150 MPa Rm 1 300 MPa Luft- und Raumfahrt - Stahl X4CrNiM
6、o16-5-1 (1.4418) - Lufterschmolzen - Gehrtet und angelassen - Stangen - De 200 mm - 1 150 MPa Rm 1 300 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 S
7、tandard 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 (Eng
8、lish, 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-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium,
9、 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, Switzerlan
10、d, Turkey 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 Mem
11、bers. Ref. No. EN 4720:2014 EBS EN 4720:2014EN 4720:2014 (E) 2 Contents Page Foreword 3 Introduction . 4 1 Scope 5 2 Normative references 5 BS EN 4720:2014EN 4720:2014 (E) 3 Foreword This document (EN 4720:2014) has been prepared by the Aerospace and Defence Industries Association of Europe - Standa
12、rdization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received 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
13、be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2015 and conflicting national standards shall be withdrawn at the latest by April 2015. Attention is drawn to the possibility that some of the elements of this document ma
14、y 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 of the following countries are bound to implement this European Standard: Austria
15、, Belgium, 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,
16、Switzerland, Turkey and the United Kingdom. BS EN 4720:2014EN 4720:2014 (E) 4 Introduction This standard is part of the series of EN metallic material standards for aerospace applications. The general organization of this series is described in EN 4258. This standard has been prepared in accordance
17、with EN 4500-005. BS EN 4720:2014EN 4720:2014 (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 tempered Bar De 200 mm 1 150 MPa Rm 1 300 MPa for aerospace applications. NOTE Other common
18、designation: AIR: Z 8 CND 17-04. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referen
19、ced document (including any amendments) applies. EN 2043, Aerospace series Metallic materials General requirements for semi-finished product qualification (excluding forgings and castings) EN 2951, Aerospace series Metallic materials Test method Micrographic determination of content of non-metallic
20、inclusions 1)EN 4050-4, Aerospace 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 Links between types of EN standards and their
21、 use EN 4500-005, Aerospace series Metallic materials Rules for drafting and presentation of material standards Part 005: Specific rules for steelsEN 4700-002, Aerospace series Steel and heat resisting alloys Wrought products Technical specification Part 002: Bar and sectionAMS 2315, Determination o
22、f 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 4720:2014EN 4720:2014 (E) 6 1 Material designation Steel X4CrNiMo16-5-1 (1.4418)
23、 2 Chemical composition % Element C Si Mn aP bS bN 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 4.3 Limit dimension(s) mm De 200 5 Technical specificatio
24、n EN 4700-002 6.1 Delivery condition Annealed Hardened (direct quenching on hot rolled products) + Tempered Hardened + Tempered Heat treatment 830 C 850 C 1 060 C / AC Tempered 250 C 1 010 C 1 060 C / OQ or WQ c+ Tempered 375 C 405 C 6.2 Delivery condition code A U 7 Use condition Hardened and tempe
25、red Delivery condition Heat treatment Delivery condition + 1 010 C 1 060 C / OQ or WQ c + 375 C 405 C Characteristics 8.1 Test sample(s) See EN 4700-002. See EN 4700-002. 8.2 Test piece(s) See EN 4700-002. See EN 4700-002. 8.3 Heat treatment Annealed Use condition 9 Dimensions concerned mm De 200 De
26、 75 De 75 75 De 200 10 Thickness of cladding on each face % 11 Direction of test piece L L LT 12 T Temperature C Ambient Ambient Ambient 13 Proof stress Rp0,2MPa 900 900 14 Strength Rm MPa 1 150 Rm 1 300 1 150 Rm 1 300 15 Elongation A % 14 14 8 16 Reduction of area Z % 17 Hardness HBW 293 350 HBW 40
27、1 350 HBW 401 18 Shear strength Rc MPa 19 Bending k 20 Impact strength KV J 100 J at 20 C Notch direction T 60 J at 30 C Notch direction T (see line 98) 100 J at 20 C Notch direction T 60 J at 30 C Notch direction T (see line 98) 50 J at 20 C Notch direction L 20 J at 30 C Notch direction L (see lin
28、e 98) 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, b, c BS EN 4720:2014EN 4720:2014 (E) 7 30 Microstructure EN 4700-002 1 See AMS 2315.7 The ferrite content shall not exceed 5 %34 Grain size EN 4700-002 7
29、G = 5 or finer 44 External defects (visual) 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 4050-2. 7 Class 5 95 Marking inspection EN 4700-002 96 Dimensional inspection EN 4700-002 98 Notes a Where a mor
30、e stringent impact strength is required (e.g. 20 J at 40 C direction L and 50 J at 40 C direction T), the maximum Mn content may be increased to 2 % subject to agreement between the customer and the supplier.b For specific welding applications (e.g. high power beam), and after agreement between manu
31、facturer and purchaser, S+P should be equal or less than 0,023 %.c Air quenching may be used for De 20 mm. 99 Typical use BS EN 4720:2014EN 4720:2014 (E) 8 100 Product qualification EN 2043 Qualification programme to be agreed between manufacturer and purchaser. This page deliberately left blankBSI
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