1、BRITISH STANDARD AEROSPACE SERIESBS 2S 204:2004(Superseding BS S 204:1967)Chromium-vanadium steel wire rod, wire and springs High duty ground wire Hardened and tempered SpecificationICS 49.025.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g3
2、8g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Incorporating um No. 1CorrigendCommittees responsible for this British StandardThe preparation of this British Standard was entrusted by ACE/61, Metallic materials for aerospace to Technical Committee ACE/
3、61/-/15, Steels, upon which the following bodies were represented:Cast Metals FederationCivil Aviation Authority AirworthinessConfederation of British MetalformingInstitute of Spring TechnologyMinistry of Defence UK Defence StandardizationSociety of British Aerospace Companies Ltd.UK Steel Associati
4、onBS 2S 204:2004This British Standard waspublished under the authorityof the Standards Policy andStrategy Committee on14 December 2004 BSI 2011The following BSI referencesrelate to the work on this British Standard:Committee reference ACE/61/-/15Draft for comment 03/316692 DCAmendments/corrigenda is
5、sued since publicationAmd. No. Date Comments C1 31 March 2011 Normative references: “BS 5S 100” changed to “BS S 100”. Reference to BS EN 10270 changed to correct part.Throughout: “the latest edition of British Standard S 100” changed to “BS S 100”ISBN 978 0 580 72677 4BS 2S 204:2004 BSI 2011iConten
6、tsPageCommittees responsible Inside front coverForeword ii1Scope 12 Inspection and testing procedure 13 Normative references 14 Process of manufacture 15 Chemical composition 16 Surface dressing 17 Condition 28 Freedom from defects 29 Final heat treatment 210 Mechanical properties 211 Examination fo
7、r decarburization 312 Dimensional tolerances 3Table 1 Chemical composition 1Table 2 Condition of supply 2Table 3 Tensile test strength 2BS 2S 204:2004ii BSI 2011ForewordThis British Standard has been prepared by Technical Committee ACE/61/-/15. It supersedes BS S 204:1967, which is withdrawn. The or
8、iginal standard was based on Ministry of Technology Specification DTD 4C.This standard covers the specification of chromium-vanadium steel wire rod, wire and springs, using high duty ground wire which has been hardened and tempered. In this revision units of measurement have been brought into line w
9、ith SI.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front co
10、ver, pages i and ii, pages 1 to 3 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.BS 2S 204:2004 BSI 201111 ScopeThis standard specifies chromium-vanadium steel wire rod, wire and springs (high duty ground wire, hardened and tempered)
11、for aerospace purposes.Wire conforming to this specification is suitable for high duty dynamically stressed springs. For other applications where hardened and tempered springs are required, wire conforming to the latest edition of British Standard S 203 ought to be used.2 Inspection and testing proc
12、edure2.1 GeneralThis British Standard shall be used in conjunction with BS S 100.2.2 Sulfur printing and deep etching testsSamples shall be selected in accordance with BS S 100.3 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated
13、references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS S 100, Procedure for inspection, testing and acceptance of wrought steels (other than plate, sheet, strip and tube).BS EN 10270-2, Steel wire for me
14、chanical springs Part 2: Oil hardened and tempered spring steel wire.4 Process of manufactureThe material shall be manufactured by an electric process unless agreed between the manufacturer and the purchaser in accordance with BS S 100.5 Chemical compositionThe steel shall contain the chemical level
15、s shown in Table 1.Table 1 Chemical composition6 Surface dressing6.1 The material from which the rods are rolled shall be overall dressed in accordance with the requirements of BS S 100.6.2 At a convenient stage of manufacture, the wire or the rod from which it is drawn shall be ground or machined a
16、ll over in order to remove surface defects and decarburization.Element Percentagemin. max.Carbon 0.46 0.54Silicon 0.10 0.35Manganese 0.60 0.90Chromium 0.80 1.10Vanadium 0.15 0.25Sulfur 0.020Phosphorus 0.025BS 2S 204:20042 BSI 20117 ConditionThe material shall be supplied in the appropriate condition
17、 stated in Table 2 unless otherwise agreed between the manufacturer and the purchaser, in which case the condition in which the material is to be supplied shall be stated on the order.Table 2 Condition of supply8 Freedom from defects8.1 Surface defects Visual examinationThe rod and wire shall be vis
18、ually examined in accordance with BS S 100.8.2 Surface defects Deep etching testsSamples of rod and wire, selected and prepared for examination in accordance with BS S 100, shall be immersed in a 50 % solution of concentrated hydrochloric acid in water at a temperature of not less than 85 C. The tim
19、e of immersion shall be approximately two seconds for every 0.025 mm of diameter but shall be not less than two minutes nor more than ten minutes.9 Final heat treatmentThe final heat treatment of the springs, the tensile test pieces for the rod, wire and springs and the reverse bend test pieces shal
20、l be:1) harden in oil from a temperature between 850 C and 880 C;2) temper at a temperature not less than 400 C to give the mechanical properties specified in Clause 10.10 Mechanical properties10.1 Tensile testsThe tensile properties of test pieces representing rod, wire and springs, selected, prepa
21、red and tested in accordance with BS S 100 and heat treated in accordance with Clause 9 shall conform to the values inTable 3. Table 3 Tensile test strength10.2 Reverse bend test (wire only 2.2 mm diameter or thickness and greater)The test pieces, selected in accordance with BS S 100, shall be heat
22、treated in accordance with Clause 9and shall then be tested in accordance with BS S 100. For round wire, each test piece shall be bent oversuitable formers having radii not exceeding three times the nominal wire diameter and shall withstand,without cracking, three complete bends.Material Condition o
23、f supplyRod for the manufacture of wire As rolledWire for the manufacture of springs Annealed or annealed and lightly drawn orannealed, lightly drawn and polished orannealed and polishedSprings Finally heat treatedTensile strengthMPaMin. Max.1 390 1 700BS 2S 204:2004 BSI 2011310.3 Single bend test (
24、wire only 2.2 mm diameter or thickness and greater)The test pieces selected in accordance with BS S 100, shall be taken from the wire in the condition asdelivered and shall not be heat treated before being tested. They shall be tested in accordance withBS S 100 over a radius equal to half the diamet
25、er or minor sectional dimension of the wire.10.4 Wrapping test (wire only less than 2.2 mm diameter or thickness)The test pieces, selected in accordance with BS S 100, shall be taken from the wire in the condition asdelivered and shall not be heat treated before being tested. They shall be tested in
26、 accordance withBS S 100.11 Examination for decarburization11.1 Microscopical examination of rod, wire and springs shall be made in accordance with BS S 100. 11.2 Unless otherwise agreed between the rod supplier and the wire manufacturer, the maximum amount of identifiable decarburization of rods th
27、at have not been ground shall not exceed one per cent of the diameter.11.3 The wire shall be completely free from decarburization.11.4 The section taken from the tensile test sample representing the springs shall be completely free from decarburization.12 Dimensional tolerancesDimensional tolerances
28、 of wire shall conform to BS EN 10270-2.BS 2S 204:2004BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorpora
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