1、BRITISH STANDARD AEROSPACE SERIESBS S 162:1990Incorporating Amendments Nos. 1 and 2Specification for18 % nickel-cobalt-molybdenum maraging steel for forging stock, forgings, bars and parts (1800 MPa: double vacuum melted)itish Industrial Fasteners Federationitish Investment Casting Trade Association
2、BS S 162:1990Committees responsible for this British StandardThStanwhBritish FBrBrBrThis British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 October 1990 BSI 17 Octob
3、er-2005The following BSI references relate to the work on this standard:Committee reference ACE/15Draft for comment 89/75368 DCISBN 0 580 18986 4British Steel IndustryBritish Steel Industry (Wire Section)Civil Aviation Authority (Airworthiness Division)Institute of British FoundrymenMinistry of Defe
4、nceNational Association of Steel StockholdersRolls-Royce LimitedSeamless Steel Tube AssociationSociety of British Aerospace Companies LimitedSteel Casting Research and Trade AssociationAmendments issued since publicationAmd. No. Date of issue Comments6373 July 199116005 October 2005 Indicated by a s
5、ideline in the margine preparation of this British Standard was entrusted by the Aerospace dards Policy Committee (ACE/-) to Technical Committee ACE/15 upon ich the following bodies were represented:orging Industry Associationitish Independent Steel Producers AssociationBS S 162:1990 BSI 17 October-
6、2005ContentsPageCommittees responsible Inside front coverForeword ii1Scope 12 References 13 Technical requirements 1Table 1 Technical requirements for 18 % Ni-Co-Mo maraging steel 2iBS S 162:1990iiDTD 5212, which it supersedes.A British Standard does not purport to include all the necessary provisio
7、ns of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself 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 bac
8、k cover.This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the ForewordThis British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is a revision of MoD (PE) Spe
9、cification BSI 17 October-2005inside front cover.BS S 162:1990 1 ScopeThis British Standard specifies the chemical composition, mechanical properties and inspection and test requirements for an 18 % nickel-cobalt-molybdenum maraging steel (iron base, Ni 18, Co 7.75, Mo 4.9) supplied in the following
10、 forms and as parts for general aerospace use:a) forging stock, designation S 162A, columns 2 and 3 of Table 1;b) forgings, designation S 162C, columns 4, 5 and 6 of Table 1;c) black bars for machining, designation S 162B, columns 7, 8 and 9 of Table 1;d) bright bars for machining, designation S 162
11、D, columns 10, 11 and 12 of Table 1.2 ReferencesThis standard makes reference to the following standards publications:BS S 100, Procedure for inspection and testing of wrought steels (other than sheet, strip and tubes).BS EN 2500, Guidelines for the preparation and use of standards for metallic mate
12、rials1).3 Technical requirements3.1 The material in its delivery and use conditions shall comply with Table 1, the format and nomenclature of which comply with BS EN 2500.3.2 This standard shall be used in conjunction with BS S 100, as given in Table 1, or as given in 3.3 to 3.5.3.3 One sample from
13、the top and bottom of each ingot shall be taken for sulphur printing or deep etching tests.3.4 The material shall be overall dressed.3.5 Finished parts shall be supplied in the solution treated and maraged condition and shall comply with sections 1 and 7 of BS S 100.(Text deleted)3.6 Where it is nec
14、essary to recover coarse grain structures, this shall be by the use of a refining treatment at 950 10C followed by AC or WQ prior to solution treatment. Where such refining thermal cycles are applied, the treatment details shall be stated on the certificate of conformity. BSI 17 October-2005 11) In
15、preparation.BS S 162:1990Table 1 Technical requirements for 18 % Ni-Co-Mo maraging steel1 Chemical composition %Element N C Si Mn P S Al B Ca Co Cr Mo Ni Ti Zr Femin. 0.05 7.0 4.6 17.0 0.30 Basemax. 0.005 0.010 0.10 0.10 0.010 0.010 0.15 0.005 0.05 8.5 0.25 5.2 19.0 0.60 0.022 1 2 3 4 5 63 Method of
16、 melting Vacuum induction melted and vacuum arc remelted4 FormMethod of productionLimit dimensionsForging stock Forgings5 Acceptance standards Sections 1 and 5 of BS S 100 Sections 1 and 6 of BS S 1006 Condition of supply and heat treatment prior to deliveryAs forged or as rolled Solution treated820
17、 C 10 C/AC (1)7 Condition of use and heat treatment prior to useAs supplied Condition of supply and maraged = 485 C 10 C/W 3 h/AC8 Test pieceHeat treatmentSamplingReference heat treatmentSee line 29As condition of supplyReference heat treatmentsee line 299 Dimensions concernedD or a mm 75 W75 75 W 7
18、510 Thickness of cladding on each face% 11 Direction of sample L T L T12TensileTemperature C Ambient temperature13 Proof stress Rp0.2MPa W 1 700 W 1 70014 Strength RmMPa 1 800 u Rmu 2 000 1 800 u Rmu 2 00015 Elongation A % W 8 W 5 W 8 W 516 Reduction of areaZ % W 40 W 25 W 40 W 2517 Hardness HV 520
19、u HV u 620 u 335 or u 321 HB 520 u HV u 62018 Shear strength RcMPa 19 Bending(r = k a)k 20 Impact Izod ft.lb W 18 W 8 W 18 W 829 Reference heat treatment Solution treated and maraged = 820 C 10 C/air cool (1) = 485 C 10 C/W 3 h/air cool34 Grain size check (2) ASTM 5 or finer; occasional grains as la
20、rge as ASTM 3 permitted44 Non destructive testing Ultrasonic check in accordance with BS S 10060 Micro cleanness check In accordance with BS S 10097 Designation S 162A S 162C98 Notes (1) The time at temperature shall be between 30 min and 60 min per 25 mm of section but not less than 30 min.(2) Grai
21、n size to be measured on material in the finally heat treated condition.2 BSI 17 October-2005BS S 162:1990 1234567891011121314151617181920293444609798Table 1 Technical requirements for 18 % Ni-Co-Mo maraging steelChemical composition %Element N C Si Mn P S Al B Ca Co Cr Mo Ni Ti Zr Femin. 0.05 7.0 4
22、.6 17.0 0.30 Basemax. 0.005 0.010 0.10 0.10 0.010 0.010 0.15 0.005 0.05 8.5 0.25 5.2 19.0 0.60 0.021 7 8 9 10 11 12Method of melting Vacuum induction melted and vacuum arc remeltedFormMethod of productionLimit dimensionsBlack barsforged or rolledBright barsforged or rolledmachined or groundAcceptanc
23、e standards Sections 1 and 2 of BS S 100Condition of supply and heat treatment prior to deliverySolution treated820 C 10 C/AC (1)Condition of use and heat treatment prior to useCondition of supply and maraged = 485 C 10 C/W 3 h/ACTest pieceHeat treatmentSamplingAs condition of supplyReference heat t
24、reatmentSee line 29As condition of supplyReference heat treatmentSee line 29Dimensions concernedD or a mm 75 W 75 75 W 75Thickness of cladding on each face% Direction of sample L T L TTensileTemperature C Ambient temperatureProof stress Rp0.2MPa W 1 700 W 1 700Strength RmMPa 1 800 u Rmu 2 000 1 800
25、u Rmu 2 000Elongation A % W 8 W 5 W 8 W 5Reduction of areaZ % W 40 W 25 W 40 W 25Hardness HV u 335 oru 321 HB520 u HV u 620 u 335 oru 321 HB520 u HV u 620Shear strength RcMPa Bending(r = k a)k Impact Izod ft.lbs W 18 W 8 W 18 W 8Reference heat treatment Solution treated and maraged = 820 C 10 C/AC (
26、1) = 485 C 10 C/W 3 h/ACGrain size check (2) ASTM 5 or finer; occasional grains as large as ASTM 3 permittedNon destructive testing Ultrasonic check in accordance with BS S 100Micro cleanness check In accordance with BS S 100Designation S 162B S 162DNotes (1) The time at temperature shall be between
27、 30 min and 60 min per 25 mm of section but not less than 30 min.(2) Grain size to be measured on material in the finally heat treated condition. BSI 17 October-2005 3BS S 162:1990BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible f
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