1、BRITISH STANDARD BS ISO 8535-2:2003 Compression-ignition engines Steel tubes for high-pressure fuel injection pipes Part 2: Requirements for composite tubes ICS 43.060.40 BS ISO 8535-2:2003 This British Standard was published under the authority of the Standards Policy and S t r a t e g y C o m m i
2、t t e e o n 10 February 2004 BSI 10 February 2004 ISBN 0 580 43415 X National foreword This British Standard reproduces verbatim ISO 8535-2:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee MCE/22, Engines for road vehicl
3、es, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section e
4、ntitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compli
5、ance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related
6、international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was
7、 last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 8535-2:2003(E)INTERNATIONAL STANDARD ISO 8535-2 Second edition 2003-10-01 Compression-ignition engines Steel tubes for high-pressure fuel injection pipes Part 2: Requirements for composite tubes Moteurs all
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13、gro Pulbisdehi n Switlrez dnaii BSISO85352:2003 iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Dimensions and tolerances . 1 4 Material processing 3 5 Testing 5 6 Designation 7 7 Identification and marking . 8 8 Packing. 8 Bibliography . 9 BSISO85352:2003iv Foreword ISO (the Int
14、ernational 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 ha
15、s 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 (IEC) on all matters of electrotechnical
16、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 committees are circulated to the member bodie
17、s 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 be held responsible for identifying any o
18、r all such patent rights. ISO 8535-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 7, Injection equipment and filters for use on road vehicles. This second edition cancels and replaces the first edition (ISO 8535-2:1993), which has been technically revised. ISO 8535 c
19、onsists of the following parts, under the general title Compression-ignition engines Steel tubes for high-pressure fuel injection pipes: Part 1: Requirements for seamless cold-drawn single-wall tubes Part 2: Requirements for composite tubes BSISO85352:2003INTENRATIONAL TSANDADR IS-5358 O2:(3002E)1Co
20、mpression-ignition engines Steel tubes for high-pressure fuel injection pipes Part 2: Requirements for composite tubes 1 Scope This part of ISO 8535 specifies the dimensions of, and gives requirements for, composite steel tubes for high- pressure fuel injection pipes used on diesel (compression-igni
21、tion) engines (Class 2) and for fuel injection pump testing (Class 1). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced
22、document (including any amendments) applies. ISO 404, Steel and steel products General technical delivery requirements ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method ISO 6892, Metallic materials Tensile testing 3 Dimensions and tolerances 3.1 Diameters Recommended inside an
23、d outside diameters are given in Table 1. Other sizes may be used by agreement between supplier and purchaser. Tolerances on inside and outside diameters shall be as follows. a) Inside diameter, d 0,05 mm for Class 2 0,025 mm for Class 1 1)b) Outside diameter, D 0,06 mm for Classes 1 and 2 1) Tolera
24、nce in accordance with ISO 4093. BSISO85352:20032 c) Concentricity of the tube outside diameter relative to the inside diameter shall be proportional to the wall thickness, as shown in Figure 1. 3.2 Length Length and tolerances on length shall be by agreement between supplier and purchaser. Table 1
25、Recommended inside and outside diameters Dimensions in millimetres Inside diameter fin ad Outside diameter fin bD Preferred Non-preferred 4,5 6 7 1,12 1,25 1,4 1,5 1,6 1,7 1,8 1,9 2 2,12 2,24 2,36 2,5 2,65 2,8 3 3,15 3,35 NOTE The diameter sizes have been established with the ratio of outside to ins
26、ide diameter within the range of 2 to 4. aBased on ISO 3. bSize combinations to be used are those falling within the cross-hatched region. BSISO85352:2003I SO 3002 All irhgts seredevr 3Figure 1 Tube diameters 4 Material processing 4.1 Steel manufacturing process The tubes shall be manufactured from
27、an unalloyed quality steel or an equivalent quality steel produced by a steel-making process that ensures a very homogeneous structure. The composite structure can be produced in various ways: a seamless inner (liner) tube is indicated by “CA”; a seamed inner tube is indicated by “CB”. 4.2 Surface q
28、uality 4.2.1 General The outside and inside surfaces of finished tubes shall be free from scale, rust, grooves, laps, laminations, deep pits or other injurious defects. 4.2.2 Minimum surface quality of bore (Grade S) The inside of the tubes of bore Grade S shall be finished to ensure a smooth bore o
29、f accurate size with no more than five imperfections (fissures, crevices, etc.) over 0,08 mm to 0,13 mm maximum depth per tube cross-section, using 50 magnification for examination (see Table 2). This does not apply to tube type CB. 4.2.3 Higher surface quality of bore (Grades O, P, Q and R) If clos
30、er control over the depth of imperfections is required, bore grades O, P, Q or R, assessed under the magnification indicated (see Table 2), may be specified in the tube designation (see Clause 6). This does not apply to tube type CB. BSISO85352:20034 I SO 3002 All irhgts seredevrTable 2 Bore grades
31、Code Permitted imperfections Magnification S As in 4.2.2 50 R No imperfections over 0,08 mm deep are permitted; no more than five imperfections over 0,05 mm deep are permitted 100 Q A maximum of five imperfections over 0,02 mm to 0,05 mm deep 100 P A maximum of five imperfections over 0,01 mm to 0,0
32、2 mm deep 200 O No imperfections over 0,01 mm deep are permitted 500 4.3 Surface finish The outside surface of the tube may be coated by metal plating or galvanizing, or may be submitted to a chemical surface treatment (see Table 3). The inside surface of a CA tube shall remain uncoated. Table 3 Sur
33、face finish Code Outside surface condition Application remarks 0 Not specified (at manufacturers choice) May have additional finish at manufacturers choice 1 Outside surface as-processed, without any additional finish. Tubes annealed or normalized in a controlled atmosphere may be discoloured, but s
34、hall be free from loose scale. Condition preferred for further surface processing 2 Zinc electroplated with a coating layer thickness of 8 m minimum and an additional colourless chromating aWhen minimum corrosion-resistance is required. Not recommended for use with light alcohol-based fuels such as
35、methanol. 3 Zinc electroplated with a coating layer thickness of 8 m minimum and an additional yellow chromating a(4, 5, 6, 7, 8) Reserved 9 As specified, subject to agreement aChromating as described in ISO 2080 and ISO 4520. BSISO85352:2003I SO 3002 All irhgts seredevr 54.4 Minimum mechanical prop
36、erties of tube The tubes shall comply with one of the classes of mechanical properties (Codes 1 to 2) resulting from the steel type and composite structure as listed in Table 4. Table 4 Mechanical properties Code Tube type Minimum tensile strength Rm Minimum upper yield stress ReH Minimum elongation
37、 A5 Maximum hardness N/mm 2N/mm 2% HV 5 aHV1 b1 CB 310 205 30 130 2 CA 310 205 23 130 170 NOTE The mechanical properties apply when the tube is tested in accordance with ISO 6892 and ISO 6507-1. aAs measured on the tube outside diameter. bAs measured on the cross-section of the inner (liner) tube. 4
38、.5 Cleanliness The bore shall be clean and free from any contamination or coating which would impair the processing and serviceability of the tubes. Any special requirements shall be agreed at the time of enquiry or order between supplier and purchaser. 4.6 Straightness Unless otherwise agreed betwe
39、en supplier and purchaser, the tubes shall be straight within a maximum error of 1 in 400 with no localised deformation. 4.7 Corrosion-resistance The outside and inside surfaces shall be protected against corrosion for transportation and storage in closed areas. A permanent coating may be used on th
40、e outside surface when agreed between supplier and purchaser. Any temporary coating used shall not be injurious to the injection and combustion systems of engines and shall be removable with diesel fuel. 5 Testing 5.1 General Unless otherwise specified, tests shall be carried out in accordance with
41、5.2 to 5.8. 5.2 Scope of tests Tubes shall be tested by lots of the same processing during composite construction, structure, dimensions and surface finish. For the test in 5.4, a test inspector shall select one tube from each lot and for the test in 5.6, three tubes. The tests in 5.3, 5.7.1 and 5.8
42、 shall be performed on all selected tubes. For the test in 5.7.3, lot size, number of samples and acceptance limit shall be agreed upon between supplier and purchaser in the order. BSISO85352:20036 5.3 Dimension measurements The tube dimension shall comply with the specifications in Clause 3. 5.4 Me
43、chanical property tests The tubes shall comply with the specifications given in Table 4. The tests shall be performed in accordance with ISO 6892 and ISO 6507-1. 5.5 Bending test The tube shall withstand cold bending through 180 over a rod of the same diameter as the tube outside diameter, without s
44、howing other than outside superficial cracks. 5.6 Cold upsetting of tubes A tube with twice the outside diameter (2D) length shall be capable of being compressed to length D without showing cracks exceeding 0,13 mm deep. The test shall be conducted between two plane and parallel plates in a suitable
45、 fixture. 5.7 Surface quality test 5.7.1 A visual check shall be carried out to ensure that tubes are in accordance with 4.3. 5.7.2 If mutually agreed upon between supplier and purchaser, the visual inspection may be replaced by a non-destructive test. 5.7.3 If a proof of a specified defect depth in
46、 the bore is required, an inspection by attributes, with an agreed AQL (acceptable quality level) shall be set when ordering; the test shall be made on metallographic cross- sections of the tube with the minimum magnification specified in Table 2. 5.7.4 Surface coatings on tubes with plated or other
47、 treated surfaces shall satisfy tests on these coatings when required. Such tests shall be agreed between supplier and purchaser. 5.8 Inside pressure test Tubes shall be capable of withstanding appropriate inside pressure agreed upon between supplier and purchaser. This capability shall be confirmed
48、 by a hydraulic test. Other non-destructive testing, such as electronic testing, may be used if agreed upon between supplier and purchaser. 5.9 Retests If, after testing in accordance with 5.4, the selected tube fails, two other tubes shall be tested from the same lot to repeat the test. The same pr
49、ocedure shall apply to the test in 5.6. Each of the tubes taken shall meet the test requirements. If any tube fails the test requirements, the whole lot shall be rejected. The supplier may resubmit a rejected lot for acceptance in an improved condition, e.g. by repeating the heat treatment. If, in this case, the test results of 5.4 and 5.6 do not fulfil the requirements, the whole lot
