1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Aerospace series Titanium tube for 35 MPa operating pressurePart 1: Inch seriesBS ISO 184871:2017 ISO 2017Aerospace series Titanium tube for 35 MPa operating pressure Part 1: Inch seriesSrie arospatiale Tubes en titane
2、Pression de service : 35 MPa Partie 1: Srie en inchesINTERNATIONAL STANDARDISO18487-1First edition2017-04Reference numberISO 18487-1:2017(E)National forewordThis British Standard is the UK implementation of ISO 184871:2017.The UK participation in its preparation was entrusted to Technical Committee
3、ACE/69, Aerospace hydraulic systems, fluids and components.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 contract. Users are responsible for its correct application. The
4、 British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 82930 7ICS 49.080Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 Ju
5、ne 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 184871:2017 ISO 2017Aerospace series Titanium tube for 35 MPa operating pressure Part 1: Inch seriesSrie arospatiale Tubes en titane Pression de service : 35 MPa Partie 1: Srie en inchesINTERNATIONAL STAND
6、ARDISO18487-1First edition2017-04Reference numberISO 18487-1:2017(E)BS ISO 184871:2017ISO 18487-1:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or uti
7、lized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyrig
8、ht officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 184871:2017ISO 18487-1:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 Dimensions . 25 Tolerances . 36 Tec
9、hnical requirements 36.1 General . 36.2 Composition 36.3 Melting practice 36.4 Heat treatment and delivery condition 36.5 Tensile properties . 36.6 Microstructure 46.6.1 General 46.6.2 Grain size 46.6.3 Contractile strain ratio (CSR) 46.7 Surface condition and texture 46.7.1 Surface treatment 46.7.2
10、 Surface condition . 46.7.3 Surface texture, Ra.56.8 Ultrasonic inspection . 56.9 Flarability 56.9.1 General 56.9.2 Surface contamination 56.10 Bending 76.11 Flattening . 76.12 Deformation under pressure test . 76.13 Impulse pressure fatigue test . 86.13.1 General 86.13.2 Proof test. 86.13.3 Pressur
11、e impulse test 86.13.4 Additional test .116.13.5 Ultimate (as per CS 25.1435) and burst test.117 Quality assurance .128 Preparation for delivery 128.1 Marking 128.2 Packing 12Bibliography .13 ISO 2017 All rights reserved iiiContents PageBS ISO 184871:2017ISO 18487-1:2017(E)ForewordISO (the Internati
12、onal Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been
13、 established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standa
14、rdization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordanc
15、e with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details
16、 of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an en
17、dorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the followi
18、ng URL: www .iso .org/ iso/ foreword .html This document was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components.A list of all the parts in the ISO 18487 series can be found on the ISO website.iv ISO 2017 All rights reser
19、vedBS ISO 184871:2017ISO 18487-1:2017(E)IntroductionThis document is intended to harmonize the technical requirements for titanium tubes used in aerospace with design operating pressure of 35 MPa.It is noted that, while ISO standards should normally refer only to SI units, large segments of the aero
20、space industry refer to other measurement systems as a matter of common working practice. The mention of “inch series” in the title of this document reflects this. It recognizes the fact that the nominal sizes referred to in the document, which are in common use in the aerospace industry, were origi
21、nally defined in terms of fractional inches.Although the tube sizes were originally defined, and are frequently referred to, in terms of non-SI units, all dimensions used in this document are in SI units with inch units given in addition for the convenience of those users more familiar with these.It
22、 is further noted that the standard ISO decimal symbol “,” (comma) is not used as common working practice for inch dimensions. A decimal point is used in the inch dimensions in this document as in many other aerospace standards.NOTE The use of non-SI units and the decimal point in this document does
23、 not constitute general acceptance of measurement systems other than SI within International Standards. ISO 2017 All rights reserved vBS ISO 184871:2017BS ISO 184871:2017Aerospace series Titanium tube for 35 MPa operating pressure Part 1: Inch series1 ScopeThis document is applicable to seamless tub
24、ing of circular cross-section made from titanium alloy and intended for use primarily in systems with system operating pressure of 35 MPa (5 080 psi) (Pressure Class J), but usage is not limited to such applications.2 Normative referencesThe following documents are referred to in the text in such a
25、way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4287, Geometrical Product Specifications (GPS) Surface t
26、exture: Profile method Terms, definitions and surface texture parametersISO 6772, Aerospace Fluid systems Impulse testing of hydraulic hose, tubing and fitting assembliesISO 8492, Metallic materials Tube Flattening testISO 8575:2016, Aerospace Fluid systems Hydraulic system tubingISO 10583, Aerospac
27、e fluid systems Test methods for tube/fitting assembliesISO 12573, Aircraft Tubing tolerances Inch seriesEN 2003-010, Aerospace series Titanium and titanium alloys Test methods Part 010: Sampling for determination of hydrogen contentEN 3718, Aerospace series Test method for metallic materials Ultras
28、onic inspection of tubesAS 4076, Contractile strain ratio testing of titanium hydraulic tubingAMS 2634, Ultrasonic inspection, thin wall metal tubing supersedingASTM E112, Standard test methods for determining average grain sizeASTM E1409, Standard test method for determination of oxygen and nitroge
29、n in titanium and titanium alloys by inert gas fusionASTM E1941, Standard test method for determination of carbon in refractory and reactive metals and their alloys by combustion analysisASTM E1447, Standard test method for determination of hydrogen in titanium and titanium alloys by the inert gas f
30、usion thermal conductivity/infrared detection methodASTM E2371, Standard test method for analysis of titanium and titanium alloys by direct current plasma and inductively coupled plasma atomic emission spectrometry (Performance-based test methodology)INTERNATIONAL STANDARD ISO 18487-1:2017(E) ISO 20
31、17 All rights reserved 1BS ISO 184871:2017ISO 18487-1:2017(E)3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p
32、 :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1outside diameterd1distance between any two points at 180 to each other around the outside of a single section across the tubeKeyd1outside diameterd2inside diametert wall thicknessFigure 1 Outside d
33、iameter, inside diameter and wall thickness3.2inside diameterd2distance between any two points at 180 to each other around the inside of a single section across the tube3.3wall thicknesstthickness measured at a right angle across the tube wall4 DimensionsUnless otherwise specified by purchaser, dime
34、nsions shall conform to ISO 8575:2016, Table 2 that is relevant to Pressure Class J.2 ISO 2017 All rights reservedBS ISO 184871:2017ISO 18487-1:2017(E)5 TolerancesUnless otherwise specified by purchaser, dimensional tolerances shall conform to ISO 12573.6 Technical requirements6.1 GeneralExcept as m
35、entioned below, testing to establish compliance with all of the technical requirements below shall be conducted on a single sample per batch of tubes.6.2 CompositionChemical composition shall conform to the percentages by weight given in Table 1. Suitable methods of determination of composition are
36、also given in Table 1. Other analytical methods may be used by agreement with the purchaser.Table 1 Chemical compositionValues in percentagesElement Al V Fe O2N2H2C YOthersTiEach TotalMinimum 2,50 2,00RemainderMaximum 3,50 3,00 0,3 0,120 0,020 0,005 0 0,05 0,005a0,10a0,40aMethod of determinationASTM
37、 E2371 ASTM E1409ASTM E1447 or EN 200310ASTM E1941 ASTM E2371aDetermination not required for routine acceptance.6.3 Melting practiceMultiple melts are required. Inert gas flooding shall be used for all steps. Open air furnace melting is not permitted. Only vacuum arc remelting (VAR) is permissible f
38、or second and subsequent melts.6.4 Heat treatment and delivery conditionCold worked and stress relieved by heating in vacuum or inert atmosphere at a temperature of at least 370 C and maintained for 30 min minimum.Rotary straightening after final heat treatment is not permitted.6.5 Tensile propertie
39、sTensile properties at 15 C for four samples per batch taken in the longitudinal direction shall meet the requirements set out in Table 2. Test method should be according to EN 2002-001 (or ASTM E8a). The method used shall be reported in the certificate. The length of the sample between the clamping
40、 jaws of the test equipment shall be at least 300 mm. ISO 2017 All rights reserved 3BS ISO 184871:2017ISO 18487-1:2017(E)Table 2 Tensile propertiesPropertyFor tubing of diameter in mm (in)6,35 10 13 10 t13 16 12 t16 20 15 tSubsequent to an examination of the outer surfaces, the sample shall be cut l
41、ongitudinally (perpendicularly to the two parallel plates) and the inner surfaces examined. When checked at 5 to 10 magnification, the inner and outer surfaces shall reveal no cracks, tears, breaks, opened die marks or opened polishing marks.6.12 Deformation under pressure testA pressure test shall
42、be performed on two tube sections per batch having a minimum length of 300 mm (12 in). The pressure shall be applied evenly and smoothly on straight tubes and shall be held for a ISO 2017 All rights reserved 7BS ISO 184871:2017ISO 18487-1:2017(E)minimum period of 2 min. Tubes shall show no bulges, l
43、eaks, pin holes, cracks or other defects when subjected to an internal hydrostatic pressure (P) sufficient to cause a tensile stress equal to Rp0,2.The average outer diameter shall not increase by more than 0,2 %.The test pressure, P, is calculated on the basis of tube dimensions and the elastic lim
44、it of the material using Formula (1):PRddddp=+0212221222,(1)whereP is the test pressure in MPa;d1is the outer diameter in mm;d2is the inner diameter in mm;Rp0,2is the minimum 0,2 % proof stress in MPa (as defined in Table 2).6.13 Impulse pressure fatigue test6.13.1 GeneralTable 6 gives the sequence,
45、 number of cycles and temperature for this sequence of tests.Table 6 Test sequence and samplesTestTemperature CTest specimen number1 2 3 4 5 6Proof x x x x x xPressure impulse test 300 000 cycles 40 C 95 C x x x x x xUltimate pressure test and burst test15 C x x95 C x xAdditional pressure impulse te
46、st up to 450 000 cycles95 C x x6.13.2 Proof testSamples shall be bled of air before testing. Before performing the pressure impulse test, carry out on all six samples a proof test at ambient temperature, at a pressure 52,5 MPa (1,5 times design operating pressure), for 5 min, according to ISO 10583.
47、 No leakage or permanent deformation of the tube or fittings is permissible.6.13.3 Pressure impulse testExcept where specified by the purchaser, this test may be conducted with samples according to any of the three configurations (see Figure 5 to Figure 7).8 ISO 2017 All rights reservedBS ISO 184871
48、:2017ISO 18487-1:2017(E)Dimensions in millimetresKeya ovalityFigure 5 Configuration 1 for impulse pressure fatigue test samplesOvality shall be representative of worst case scenario as defined by the purchaser. ISO 2017 All rights reserved 9BS ISO 184871:2017ISO 18487-1:2017(E)Keyl 31,75 mm to 38,1
49、mm (1.25 in to 1.50 in)Figure 6 Configuration 2 for impulse pressure fatigue test samplesTable 7 Straight length between bends for Configuration 2Tube OD (mm) Tube OD (in)L (mm)+12.7/0,00L (in)+0.50/0.006,35 0.250 63,5 2.509,52 0.375 63,5 2.5012,70 0.500 88,9 3.5015,87 0.625 139,7 5.5019,05 0.750 139,7 5.5025,4 1.000 139,7 5.5031,75 1.250 139,7 5.5010 ISO 2017 All rights reservedBS ISO 184871:2017ISO 18487-1:2017(E)Keyl 31,75 m
