1、BRITISH STANDARD AEROSPACE SERIESBS 2S 205:2004(Superseding BS S 205:1969)Austenitic chromium-nickel steel wire rod, wire and springs SpecificationICS 49.025.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44
2、g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Incorporating um No. 1 CorrigendCommittees responsible for this British StandardThe preparation of this British Standard was entrusted by ACE/61, Metallic materials for aerospace to Technical Committee ACE/61/-/15, Steels, upon which the fo
3、llowing 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 AssociationBS 2S 205:2004This British Stand
4、ard 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 03/316693 DCAmendments/corrigenda issued since publicationAmd. No. Dat
5、e Comments C1 31 March 2011 Normative references: “BS 5S 100” changed to “BS S 100”Throughout: “the latest edition of British Standard S 100” changed to “BS S 100”ISBN 978 0 580 72678 1BS 2S 205:2004 BSI 2011iContentsPageCommittees responsible Inside front coverForeword ii1Scope 12 Inspection and te
6、sting 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 Dimensional tolerances 3Table 1 Chemical composition 1Table 2 Condition of supply 2Table 3 Tensile
7、test strengths 3BS 2S 205:2004ii BSI 2011ForewordThis British Standard has been prepared by Technical Committee ACE/61/-/15. It supersedes BS S 205:1969, which is withdrawn. The original standard was based on Ministry of Technology Specification DTD 5006.This standard covers the specification of aus
8、tenitic chromium-nickel steel wire rod, wire and springs. In this revision units of measurement have been brought into line with 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 Sta
9、ndard cannot confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, 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 205:2004 BSI 201111 Sc
10、opeThis standard specifies austenitic chromium-nickel steel wire rod, wire and springs for aerospace purposes.2 Inspection and testing procedure2.1 GeneralThis British Standard shall be used in conjunction with BS S 100.2.2 Sulfur printing or deep etching testsSamples shall be selected in accordance
11、 with BS S 100.3 Normative referencesThe 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 document (including any amendments) applies.BS S 100, Pro
12、cedure for inspection, testing and acceptance of wrought steels (other than plate, sheet, strip and tube).BS EN 10270-3, Steel wire for mechanical springs Part 3: Stainless spring steel wire.4 Process of manufactureThe material shall be manufactured by an electric process unless otherwise agreed bet
13、ween the manufacturer and the purchaser in accordance with BS S 100.5 Chemical compositionThe steel shall contain the chemical levels shown in Table 1.Table 1 Chemical composition6 Surface dressingThe material from which the rods are rolled shall be overall dressed in accordance with the requirement
14、s of BS S 100.Element PercentageMin. Max.Carbon 0.15Silicon 0.20 1.0Manganese 0.50 2.0Phosphorus 0.035Sulfur 0.025Chromium 17.0 19.0Nickel 7.5 9.0BS 2S 205:20042 BSI 20117 ConditionThe material shall be supplied in the appropriate condition stated in Table 2 unless otherwise agreed between the manuf
15、acturer 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 visually examined in accordance with BS S 100.8.2 Surface defe
16、cts Deep etching testsSamples of rod and wire, selected and prepared for examination in accordance with BS S 100,shall be immersed in a solution containing 10 % by volume of concentrated nitric acid and 3.5 % by volume of hydrofluoric acid (40 % HF) in water at approximately 60 C. The time of immers
17、ion shall be approximately two seconds for every 0.025 mm of diameter, but shall not be less than two minutes nor more than ten minutes. An alternative solution may be used if agreed by the Inspecting Authority 8.3 Alternatively to 8.2, for wire of less than 2.0 mm diameter the deep etching test sha
18、ll be replaced by a twisting test. The test samples selected shall have a test length of 100 diameters and shall be twisted at a speed not exceeding 60 r/min until failure occurs. The wire shall be examined after five turns and after failure and shall show no evidence of defects likely to be detrime
19、ntal to the end use.9 Final heat treatmentThe final heat treatment of the springs and the tensile test pieces representing the springs shall be:Low temperature heat treatment at a temperature between 350 C and 450 C for not less than 30 min.10 Mechanical properties10.1 Tensile test (wire and springs
20、 only)10.1.1 Wire. The tensile properties of test pieces for wire, selected prepared and tested in accordance with BS S 100, shall comply with the tensile range given in Table 3.10.1.2 Test pieces representing springs. The tensile properties of test pieces representing springs, selected, prepared an
21、d tested in accordance with BS S 100 and heat treated in accordance with Clause 9, shallcomply with the minimum tensile strength values given in Table 3.10.2 Reverse bend test (wire only, 3.0 mm diameter or thickness and greater)The test pieces, selected in accordance with BS S 100, shall be taken f
22、rom wire in the condition as deliveredand shall not be heat treated before being tested in accordance with BS S 100. For round wire, the testpiece shall be bent over suitable formers having radii not exceeding three times the nominal wirediameter and shall withstand, without cracking, three complete
23、 bends.Material Condition of supplyRods for the manufacture of wire As rolledWire for the manufacture of springs Cold drawnSprings Finally heat treatedBS 2S 205:2004 BSI 2011310.3 Wrapping test (wire only, less than 3.0 mm diameter or thickness)The test pieces selected in accordance with BS S 100, s
24、hall be taken from wire in the condition as deliveredand shall not be heat treated before being tested in accordance with BS S 100.Table 3 Tensile test strengths11 Dimensional tolerancesDimensional tolerances of wire shall conform to BS EN 10270-3.Nominal wire diameter Tensile strengthOver Up to and
25、 including Min. Max.mm mm MPa MPa0.200.300.400.300.400.502 1502 1002 0500.500.600.700.600.700.802 0001 9501 9002 1502 1000.801.001.301.001.301.601 8501 8001 7502 0502 0001 9501.601.902.201.902.202.601 7001 6501 6001 9001 8501 8002.603.003.403.003.403.801 5501 5001 4501 7501 7001 6503.804.204.604.204
26、.605.001 4001 3501 3001 6001 5501 5005.005.606.408.005.606.408.0010.001 2501 2001 1001 0001 4501 4001 3001 200BS 2S 205:2004BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view
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