1、BSI Standards PublicationBS EN 16602-70-36:2014Space product assurance Material selection forcontrolling stress-corrosioncrackingBS EN 16602-70-36:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation ofEN 16602-70-36:2014. It supersedes BS EN 14101:2001 which is withd
2、rawn.The UK participation in its preparation was entrusted to Technical Committee ACE/68, Space systems and operations.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 provisions of a cont
3、ract. Users are responsible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 84600 7 ICS 49.140 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the auth
4、ority of the Standards Policy and Strategy Committee on 30 November 2014.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 16602-70-36 October 2014 ICS 49.025.01; 49.140 Supersedes EN 14101:2001 English version Space product a
5、ssurance - Material selection for controllingstress-corrosion cracking Assurance produit des projets spatiaux - Slection des matriaux en vue dviter leur fissuration par corrosion souscontrainte Raumfahrtproduktsicherung - Kriterien fr dieWerkstoffwahl zur Vermeidung von Spannungsrisskorrosion This E
6、uropean Standard was approved by CEN on 11 April 2014. CEN and CENELEC 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
7、 references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN and CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the respon
8、sibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
9、 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, Turkey and United Kingdom.
10、 CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN/CENELEC All rights of exploitation in any form and by any means reservedworldwide for CEN national Members and for CENELECMembers. Ref. No. EN 16602-70-36:2014 E BS EN 16602-70-36:2014Table of contents Foreword 5 1 Scope . 6
11、2 Normative references . 7 3 Terms, definitions and abbreviated terms 8 3.1 Terms from other standards 8 3.2 Terms specific to the present standard . 8 3.3 Abbreviated terms. 8 4 Principles 9 4.1 Stress corrosion 9 4.2 Evaluation of metal alloys . 9 5 Requirements 10 5.1 Stress corrosion cracking re
12、sistance evaluation of metal alloys 10 5.1.1 Overview . 10 5.1.2 Requirements for case 1 . 10 5.1.3 Requirements for Case 2 11 5.2 Materials selection criteria 11 5.2.1 General . 11 5.2.2 High SCC resistance alloys . 11 5.2.3 Moderate SCC resistance alloys . 12 5.2.4 Low SCC resistance alloys 12 5.2
13、.5 Unlisted materials . 13 5.3 Design and assembly . 13 5.4 Customers approval . 13 Annex A (normative) Request for SCC resistance evaluation - DRD . 23 A.1 DRD identification . 23 A.1.1 Requirement identification and source document 23 A.1.2 Purpose and objective . 23 A.2 Expected response . 23 A.2
14、.1 Scope and content 23 EN 16602-70-36:2014 (E)BS EN 16602-70-36:2014A.2.2 Special remarks 23 Annex B (normative) SCC resistance test specifications and procedures (Work Proposal) - DRD 24 B.1 DRD identification . 24 B.1.1 Requirement identification and source document 24 B.1.2 Purpose and objective
15、 . 24 B.2 Expected response . 24 B.2.1 Scope and content 24 B.2.2 Special remarks 24 Annex C (normative) Stress-corrosion evaluation form (SCEF) - DRD 25 C.1 DRD identification . 25 C.1.1 Requirement identification and source document 25 C.1.2 Purpose and objective . 25 C.2 Expected response . 25 C.
16、2.1 Scope and content 25 C.2.2 Special remarks 29 Annex D (informative) Grain orientation . 31 D.1 Introduction . 31 D.2 Anisotropy of grain orientation 31 Annex E (informative) SCC resistance of alloys . 35 E.1 Stress corrosion susceptibility . 35 E.2 Metal alloys. 36 E.2.1 Aluminium . 36 E.2.2 Ste
17、el . 36 E.2.3 Nickel 36 E.2.4 Copper 36 Annex F (informative) Stress sources . 38 F.1 Introduction . 38 F.2 Stress sources 38 Bibliography . 39 Figures Figure C-1 : Example of a Stress-corrosion evaluation form . 29 Figure D-1 : Grain orientations in standard wrought forms 32 EN 16602-70-36:2014 (E)
18、BS EN 16602-70-36:2014Figure D-2 : Examples of tensile stresses in short transverse direction applied during assembly 33 Figure D-3 : Examples of tensile stresses in short transverse direction resulting from assembly 34 Figure E-1 : Typical residual stress distributions in 7075 Aluminium alloys . 37
19、 Tables Table 5-1: Alloys with high resistance to stress-corrosion cracking 14 Table 5-2: Alloys with moderate resistance to stress-corrosion cracking 18 Table 5-3: Alloys with low resistance to stress-corrosion cracking 20 Table F-1 : Sources of stress 38 EN 16602-70-36:2014 (E)BS EN 16602-70-36:20
20、14Foreword This document (EN 16602-70-36:2014) has been prepared by Technical Committee CEN/CLC/TC 5 “Space”, the secretariat of which is held by DIN. This standard (EN 16602-70-36:2014) originates from ECSS-Q-ST-70-36C. This European Standard shall be given the status of a national standard, either
21、 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 may be the subject of patent rights. CEN and/or CEN
22、ELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14101:2001. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This document has been developed to cover specifi
23、cally space systems and has therefore precedence over any EN covering the same scope but with a wider domain of applicability (e.g. : aerospace). According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European St
24、andard: Austria, 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,
25、Spain, Sweden, Switzerland, Turkey and the United Kingdom. EN 16602-70-36:2014 (E)BS EN 16602-70-36:20141 Scope This Standard covers the following processes of the general materials, mechanicals parts and processes (MMPP) flow of ECSS-Q-ST-70: The selection of metal alloys for which preference is gi
26、ven to approved data sources (Table 5-1 to Table 5-3) The criticality analysis to determine if a stress corrosion cracking (SCC) evaluation is necessary This Standard sets forth the criteria to be used in the selection of materials for spacecraft and associated equipment and facilities so that failu
27、re resulting from stress-corrosion is prevented. It is intended to provide general criteria to be used in stress-corrosion cracking control, which begins during design thanks to a methodological material selection. This document does not intend to include all factors and criteria necessary for the t
28、otal control of stress-corrosion cracking in all alloys. The criteria established in this Standard are only applicable to designs for service involving exposure conditions similar to testing conditions As regards weldments, this Standard is applicable to aluminium alloys, selected stainless steels i
29、n the 300 series and alloys listed in Table 5-1. This Standard is not applicable to listed materials whose behaviour differs at elevated temperature and in specific chemical. This standard may be tailored for the specific characteristic and constrains of a space project in conformance with ECSS-S-ST
30、-00. EN 16602-70-36:2014 (E)BS EN 16602-70-36:20142 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this ECSS Standard. For dated references, subsequent amendments to, or revision of any of these publications d
31、o not apply, However, parties to agreements based on this ECSS Standard are encouraged to investigate the possibility of applying the more recent editions of the normative documents indicated below. For undated references, the latest edition of the publication referred to applies. EN reference Refer
32、ence in text Title EN 16601-00-01 ECSS-S-ST-00-01 ECSS system - Glossary of terms EN 16602-70 ECSS-Q-ST-70 Space product assurance - Materials, mechanical parts and processes. EN 16602-70-37 ECSS-Q-ST-70-37 Space product assurance - Determination of the susceptibility of metals to stress-corrosion c
33、racking. NASA-MSFC-SPEC 522B (July 1987) Design criteria for controlling stress-corrosion cracking EN 16602-70-36:2014 (E)BS EN 16602-70-36:20143 Terms, definitions and abbreviated terms 3.1 Terms from other standards For the purpose of this Standard, the terms and definitions from ECSS-ST-00-01 and
34、 ECSS-Q-ST-70 apply. 3.2 Terms specific to the present standard 3.2.1 stress-corrosion combined action of sustained tensile stress and corrosion that can lead to the premature failure of materials 3.3 Abbreviated terms For the purpose of this Standard, the abbreviated terms from ECSS-S-ST-00-01 and
35、the following apply: Abbreviation Meaning SCC stress-corrosion cracking SCEF stress-corrosion evaluation form EN 16602-70-36:2014 (E)BS EN 16602-70-36:20144 Principles 4.1 Stress corrosion Certain materials are more susceptible to stress corrosion cracking (SCC) than others. If a susceptible materia
36、l is placed in service in a corrosive environment under tension of sufficient magnitude, and the duration of service is sufficient to permit the initiation and growth of cracks, failure occurs at a stress lower than that which the material is normally be expected to withstand. The corrosive environm
37、ent need not be severe in terms of general corrosive attack. NOTE Service failures due to stress-corrosion are frequently encountered in cases where the surfaces of the failed parts are not visibly corroded in a general sense. Moreover, stresses are additive and threshold stresses for susceptibility
38、 are often low. There have been a number of stress-corrosion failures for which design stresses were intermittent and of short duration, and only of minor significance in contributing to failure. Stress-corrosion cracking in those cases occurred because of a combination of residual and assembly stre
39、sses not anticipated in design. 4.2 Evaluation of metal alloys Resistance to stress- corrosion cracking of metal alloys depends mainly on factors: Grain orientation (see Annex D) Susceptibility to SCC (see Annex E) EN 16602-70-36:2014 (E)BS EN 16602-70-36:20145 Requirements 5.1 Stress corrosion crac
40、king resistance evaluation of metal alloys 5.1.1 Overview Clause 5.1.2 lists the requirements applicable for applications involving and identified as case 1: unlisted materials (i.e. materials not listed in tables 1, 2 or 3), or combinations of materials and environments outside the scope of this St
41、andard Clause 5.1.3 lists the requirements applicable for application involving listed materials with moderate SCC resistance, low SCC resistance, or moderate or low SCC resistance and coated or plated with materials with a high SCC resistance. and identified as case 2. NOTE The classes for high, mo
42、derated and low resistance to SCC are defined in ECSS-Q-ST-70-37. 5.1.2 Requirements for case 1 a. A request for evaluation shall be established in conformance with the DRD in Annex A. b. As a reply to the customer request for SCC evaluation, the supplier shall provide a work proposal (including tes
43、t specifications and procedures) in conformance with the DRD in Annex B. NOTE An example of approved test specifications and procedures is ECSS-Q-ST-70-37. c. The supplier shall perform a detailed evaluation of susceptibility according to test specifications and procedures approved by the customer E
44、N 16602-70-36:2014 (E)BS EN 16602-70-36:2014NOTE This is often the case for many applications involving unfamiliar materials, or unusual combinations of materials and environments. d. The results of stress corrosion cracking resistance evaluation shall be reported in conformance with DRD in Annex A
45、of ECSS-Q-ST-70-37. e. The SCC test report shall be submitted for customers approval before the material under evaluation is used or incorporated in a design. 5.1.3 Requirements for Case 2 a. The supplier shall provide the SCEF in conformance with the DRD in Annex C. 5.2 Materials selection criteria
46、 5.2.1 General a. The supplier shall use in preference high SCC resistance alloys listed in Table 5-1. NOTE Selecting an alloy from this table avoid the need to perform a stress corrosion evaluation 5.2.2 High SCC resistance alloys 5.2.2.1 Surface treated materials a. Alloys which are surface treate
47、d shall be evaluated according to 5.1.3a. NOTE 1 For example: Metals having been treated with surface treatments such as nitriding and carburising. A low-strength plain carbon steel, carburised on the surface to a hardness corresponding to a tensile strength above 1 370 MPa (200 ksi). NOTE 2 Surface
48、 treatment such as nitriding and carburising can make a stress-corrosion evaluation necessary for a material not normally considered susceptible. EN 16602-70-36:2014 (E)BS EN 16602-70-36:20145.2.3 Moderate SCC resistance alloys 5.2.3.1 Coated and plated materials a. Alloys with moderate SCC resistan
49、ce and coated or plated with materials with a high SCC resistance shall be evaluated according to 5.1.3a. NOTE 1 For example: Even though 2024-T6 aluminium is anodised, this material has moderate resistance to stress corrosion. NOTE 2 All electroplated, anodised and chemical-conversion coatings on otherwise acceptable materials are excluded from the requirements of this specification 5.2.3.2 Thin materials (alloy or temper of metal) a. Sheet material less than 6,5 mm (0,250 inch) thick of the aluminium alloys listed in Table 5-2 do not require a SCEF accord
