1、BRITISH STANDARDBS EN ISO 11114-4:2005Transportable gas cylinders Compatibility of cylinder and valve materials with gas contents Part 4: Test methods for selecting metallic materials resistant to hydrogen embrittlementThe European Standard EN ISO 11114-4:2005 has the status of a British StandardICS
2、 23.020.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 11114-4:2005This British Standard was published under the authority of the Stand
3、ards Policy and Strategy Committee on 30 April 2007 BSI 2007ISBN 978 0 580 50518 8National forewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 11114-4:2005. The UK participation in its preparation was entrusted by Technical Committee PVE/3, Gas containers, to Su
4、bcommittee PVE/3/1, Valve fittings for gas containers.A list of organizations represented on PVE/3/1 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.Compliance with
5、a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 11114-4August 2005ICS 23.020.30English VersionTransportable gas cylinders - Compatibility of cylinder and valvematerials wit
6、h gas contents - Part 4: Test methods for selectingmetallic materials resistant to hydrogen embrittlement (ISO11114-4:2005)Bouteilles gaz transportables - Compatibilit desmatriaux des bouteilles et des robinets avec les contenusgazeux - Partie 4: Mthodes dessai pour le choix dematriaux mtalliques rs
7、istants la fragilisation parlhydrogne (ISO 11114-4:2005)Ortsbewegliche Gasflaschen - Vertrglichkeit vonWerkstoffen fr Gasflaschen und Ventile mit den inBerhrung kommenden Gasen - Teil 4: Prfverfahren zurAuswahl von metallischen Werkstoffen, die gegenWasserstoffversprdung unempfindlich sind (ISO 1111
8、4-4:2005)This European Standard was approved by CEN on 22 July 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical
9、 references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member
10、 into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania
11、, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of
12、 exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 11114-4:2005: EForeword This document (EN ISO 11114-4:2005) has been prepared by Technical Committee ISO/TC 58 “Gas cylinders“ in collaboration with Technical Committee CEN/TC 23 “Transportable gas
13、cylinders“, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2006, and conflicting national standards shall be withdrawn at the latest by February
14、2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latv
15、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 11114-4:2005 has been approved by CEN as EN ISO 11114-4:2005 without any modifications, except as stated in normative annex N
16、A. NOTE Normative references to International Standards are listed in Annex ZA (normative). EN ISO 11114-4:2005Reference numberISO 11114-4:2005(E)INTERNATIONAL STANDARD ISO11114-4First edition2005-08-01Transportable gas cylinders Compatibility of cylinder and valve materials with gas contents Part 4
17、: Test methods for selecting metallic materials resistant to hydrogen embrittlement Bouteilles gaz transportables Compatibilit des matriaux des bouteilles et des robinets avec les contenus gazeux Partie 4: Mthodes dessai pour le choix de matriaux mtalliques rsistants la fragilisation par lhydrogne E
18、N ISO 11114-4:2005ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms, definitions and symbols 2 3.1 Terms and definitions. 2 3.2 Symbols . 3 4 General requirements. 3 5 Test methods. 4 5.1 Disc test (method A). 4 5.2 Fracture mechanic test (method B) 9 5.3
19、Test method to determine the resistance to hydrogen assisted cracking of steel cylinders (method C) . 13 5.4 Tensile tests 16 EN ISO 11114-4:2005Annex ZA (normative) Normative references to international publications with their relevant Annex NA (normative) Specific European requirements17 European
20、publications 18 iv Foreword ISO (the International 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 su
21、bject for which a technical committee has been 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 (
22、IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical commi
23、ttees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not b
24、e held responsible for identifying any or all such patent rights. ISO 11114-4 was prepared by Technical Committee ISO/TC 58, Gas cylinders. ISO 11114 consists of the following parts, under the general title Transportable gas cylinders Compatibility of cylinder and valve materials with gas contents:
25、Part 1: Metallic materials Part 2: Non-metallic materials Part 3: Autogenous ignition test in oxygen atmosphere Part 4: Test methods for selecting metallic materials resistant to hydrogen embrittlement EN ISO 11114-4:2005vIntroduction It is widely recognised that compressed hydrogen and some hydroge
26、n bearing gases can have an embrittling effect on metallic materials, especially steels. This embrittling effect has resulted in the failure of hydrogen cylinders (including some bursts) that has led gas cylinder users and manufacturers to adopt specific measures. The adoption of these measures has
27、eliminated all known failures of hydrogen cylinders from this embrittlement phenomenon. The basic recommendation was to minimise the stresses in the cylinder wall (see ISO 11114-1) and eliminate harmful defects. This tensile strength limit of 950 MPa was developed for quenched and tempered gas cylin
28、ders of 34 Cr Mo 4 type steels using steelmaking practices, chemistry and manufacturing techniques typical of those used during the early 1980s and successfully used for filling pressures up to 300 bar. This practice has been in widescale use up to the current time. Other higher pressures, although
29、at lower tensile strength limits, have also been used. In recent years, improvements in steelmaking, e.g. by reducing the sulphur and phosphorus contents, have indicated the possibility of increasing the tensile strength limit of 950 MPa for embrittling gas service, as a result of improvements in th
30、e fracture toughness of the material. Experimental work has shown that the relevant parameters affecting hydrogen embrittlement are the following: a) microstructure resulting from the combination of the chemistry and the heat treatment; b) mechanical properties of the material; c) applied wall stres
31、s; d) internal surface imperfections resulting in local stress concentrations; e) characteristics of the gas contained (composition, quality, pressure, etc.). When developing this part of ISO 11114 only the material aspects, a) and b) above, were considered. Other essential features, c) and d), are
32、covered by the relevant parts of ISO 9809. This part of ISO 11114 specifies test methods to identify steels which, when combined with the cylinder manufacturing requirements specified in ISO 9809 (all parts), will result in cylinders suitable for use in embrittling gas service. However, some low all
33、oy steels other than 34 Cr Mo 4 may require tensile strength lower than 950 MPa to be suitable for the manufacture of gas cylinders for embrittling gas service. These tests have been developed following an extensive world-wide programme which incorporated laboratory and full scale tests. EN ISO 1111
34、4-4:2005blank1Transportable gas cylinders Compatibility of cylinder and valve materials with gas contents Part 4: Test methods for selecting metallic materials resistant to hydrogen embrittlement 1 Scope This part of ISO 11114 specifies test methods and the evaluation of results from these tests in
35、order to qualify steels suitable for use in the manufacture of gas cylinders (up to 3 000 l) for hydrogen and other embrittling gases. This part of ISO 11114 only applies to seamless steel gas cylinders. The requirements of this part of ISO 11114 are not applicable if at least one of the following c
36、onditions for the intended gas service is fulfilled 1): the working pressure of the filled embrittling gas is less than 20 % of the test pressure of the cylinder; the partial pressure of the filled embrittling gas of a gas mixture is less than 5 MPa (50 bar) in the case of hydrogen and other embritt
37、ling gases, with the exception of hydrogen sulphide and methyl mercaptan in which cases the partial pressure shall not exceed 0,25 MPa (2,5 bar). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition c
38、ited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 4287, Geometrical product specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parameters ISO 7539-1:1987, Corrosion of metals and alloys
39、 Stress corrosion testing Part 1: General guidance on testing procedures ISO 7539-6:2003, Corrosion of metals and alloys Stress corrosion testing Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement ISO 9809-1, Gas cylinders Refillable seamless
40、steel gas cylinders Design, construction and testing Part 1: Quenched and tempered steel cylinders with tensile strength less than 1 100 MPa ISO 9809-2, Gas cylinders Refillable seamless steel gas cylinders Design, construction and testing Part 2: Quenched and tempered steel cylinders with tensile s
41、trength greater than or equal to 1 100 MPa 1) In such cases the cylinders may be designed as for ordinary (non embrittling) gases. EN ISO 11114-4:20052 ISO 9809-3, Gas cylinders Refillable seamless steel gas cylinders Design, construction and testing Part 3: Normalized steel cylinders ISO 11114-1:19
42、97, Transportable gas cylinders Compatibility of cylinder and valve materials with gas contents Part 1: Metallic materials ISO 11120, Gas cylinders Refillable seamless steel tubes for compressed gas transport, of water capacity between 150 l and 3 000 l Design, construction and testing 3 Terms, defi
43、nitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. Some of the definitions used are based upon those in ISO 7539-1:1987. 3.1.1 embrittling gases gases listed in ISO 11114-1:1997, Table A.3, group 2 and Table A.12, group 11 3.1.
44、2 hydrogen rupture pressure, PH2maximum pressure recorded during the hydrogen rupture pressure test 3.1.3 helium rupture pressure, PHemaximum pressure recorded during the helium rupture pressure test 3.1.4 hydrogen embrittlement index maximum value of the ratio PHe/PH2as a function of the pressure r
45、ise rate 3.1.5 environmentally-assisted cracking synergistic effect on a metal caused by the simultaneous action of a particular environment and a nominally static tensile stress, which results in the formation of cracking 3.1.6 threshold stress stress above which a crack will initiate and grow, for
46、 the specified test conditions 3.1.7 plane strain stress intensity factor, K1function of applied load, crack length and specimen geometry having dimensions of stress length NOTE K1 uniquely defines the elastic stress field intensification at the tip of a crack subjected to opening mode displacements
47、. 3.1.8 threshold stress intensity factor for susceptibility to environmentally-assisted cracking, K1Hstress intensity factor above which an environmentally-assisted crack will initiate and grow, for the specified test conditions under conditions of high constraint to plastic deformation, i.e. under
48、 essentially plane strain conditions 3.1.9 HAC hydrogen assisted cracking EN ISO 11114-4:200533.2 Symbols For the purposes of this document, the following symbols apply. a effective crack length measured from the crack tip to the loading plane a0 average value of a B specimen thickness emthe mean di
49、sc thickness E modulus of elasticity KIAPPapplied elastic stress-intensity K1Hthreshold stress intensity factor m elastic displacement per unit load P applied load Pr actual rupture pressure Pr corrected rupture pressure PrH2corrected hydrogen rupture pressure PrHetheoretical helium rupture pressure corresponding to the same pressure rise rate as for the hydrogen test, calculated by regression from the corrected helium rupture pressure Rmactual value of tensile strength RP0,2average
