1、BSI Standards PublicationBS 3S 98:2014Specification for 2.5%nickel-chromium-molybdenum (high carbon)steel billets, bars, forgingsand parts(1 160 1 310 MPa: limitingruling section 155 mm)Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documen
2、twas last issued. The British Standards Institution 2014Published by BSI Standards Limited 2014ISBN 978 0 580 83818 7ICS 49.025.10The following BSI references relate to the work on this document:Committee reference ACE/61Draft for comment 14/30287577DCPublication historyThis standard supersedes BS 2
3、S 98:1964, which is withdrawn.Amendments issued since publicationDate Text affectedBS 3S 98:2014 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Technical requirements 1Bibliography 6List of tablesTable1Technical requirements for 2.5% nickel-chromium-molybdenum steelforging sto
4、ck and forgings 2Table2Technical requirements for 2.5% nickel-chromium-molybdenum steelblack bar and bright bar 4Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii,pages 1 to 6, an inside back cover and a back cover.BRITISH STANDARD BS 3S 98:2014 The British
5、Standards Institution 2014 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 December 2014. Itwas prepared by Panel ACE/61/-/15, Steels for aerospace purposes, under theauthority
6、 of Technical Committee ACE/61, Metallic materials for aerospacepurposes. A list of organizations represented on this committee can be obtainedon request to its secretary.SupersessionThis British Standard supersedes BS 2S 98:1964, which is withdrawn.Information about this documentThis is a full revi
7、sion of the Standard, and introduces the following principalchanges: the requirements are stated in tabular format in accordance withBS EN 4500-1 and BS EN 4500-5; requirements are added for forgings in the softened condition (designationS 98G); limiting ruling section is increased from 150 mm to 15
8、5 mm; reference is made to the latest edition of BS S 100; and properties and dimensions are given in SI units.Hazard warningsWARNING. This British Standard calls for the use of substances and/orprocedures that can be injurious to health if adequate precautions are nottaken. It refers only to techni
9、cal suitability and does not absolve the userfrom legal obligations relating to health and safety at any stage.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“sha
10、ll”.Commentary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its corre
11、ct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARDBS 3S 98:2014ii The British Standards Institution 20141 ScopeThis British Standard specifies requirements for 2.5%nickel-chromium-molybdenum (high carbon) steel supplied in the followingfor
12、ms, and as parts. Forging stock: softened, designation S 98A. Forgings: hardened and tempered, designation S 98C. Forgings: softened, designation S 98G. Black bars for machining: hardened and tempered, designation S 98B. Black bars for machining: softened, designation S 98E. Bright bars for machinin
13、g: hardened and tempered, designation S 98D. Bright bars for machining: softened, designation S 98F.2 Normative referencesThe following British Standard, in whole or in part, is normatively referenced inthis document and is indispensable for its application. As this is an undatedreference, the lates
14、t edition of this referenced British Standard (including anyamendments) applies.BS S 100, Procedure for inspection, testing and acceptance of wrought steels(other than plate, sheet, strip and tube)3 Technical requirements3.1 Material to this standard shall conform to Tables 1 and 2.NOTE The format a
15、nd symbols used in Table 1 and Table 2 are derived fromBS EN 4500-1 and BS EN 4500-5.3.2 One top sample shall be taken from each ingot for sulfur printing or deepetching tests.3.3 The material shall be overall dressed at a suitable stage in manufacture.3.4 Parts hardened and tempered after machining
16、 shall conform toSection 1 and Section 7 of BS S 100.3.5 Parts shall be supplied in the hardened and tempered condition.BRITISH STANDARD BS 3S 98:2014 The British Standards Institution 2014 1Table 1 Technical requirements for 2.5% nickel-chromium-molybdenum steel forging stock andforgings1 Material
17、designation BS S 982 Chemical composition%Element C Si Mn P S Cr Mo Ni Al FeMin 0.36 0.10 0.45 0.50 0.45 2.30 0.015 BaseMax 0.44 0.35 0.70 0.025 0.015 0.80 0.65 2.80 0.0503 Method of melting Air melted by an electric process4.1 Form Forging stock (S 98A) Forgings (S 98G) Forgings (S 98C)4.2 Method o
18、f production Cast or wrought Forged from S 98A stock Forged from S 98Astock4.3 Limit dimension(s) mm aorD 1555 Technical specification Sections 1 and 5 of BS S 100 Sections 1 and 6 of BS S 100 Sections 1 and 6 ofBS S 1006.1 Delivery condition Softened Softened Hardened andtemperedHeat treatment 820C
19、 850C/OQ+ 500C 660C/AC6.2 Delivery condition code AA U7 Use condition Delivery condition Hardened and tempered Delivery conditionHeat treatment 820C 850C/OQ+ 500C 660C/ACCharacteristics8.1 Test sample(s) See Section 5 of BS S 100 See Section 6 of BS S 100 See Section 6 ofBS S 1008.2 Test piece(s) Se
20、e Section 5 of BS S 100 See Section 6 of BS S 100 See Section 6 ofBS S 1008.3 Heat treatment DeliveryconditionReference(see Line 29)DeliveryconditionUse condition Delivery condition9 Dimensions concerned mm a or D 155 a or D 155 aorD 15510 Thickness of cladding oneach face%11 Direction of test piece
21、 L L L12TTemperature C Ambient Ambient Ambient Ambient Ambient13 Proof stress Rp0.2MPa 1 000 1 000 1 00014 Strength RmMPa 1 160 Rm 1 310 1 160 Rm 1 3101 160 Rm 1 31015 Elongation A% 10 10 1016 Reduction ofareaZ% 17 Hardness HBW 277341 HBW 388 or 360 HV 410HBW 277341 HBW 388 or 360 HV 410341 HBW 388o
22、r 360 HV 41018 Shear strength RcMPa 19 Bending 20 Impact strength ft-lbf 25 25 2521CTemperature C 22 Time h23 Stress aMPa 24 Elongation a% 25 Rupture stress RMPa 26 Elongation atruptureA% 27 Notes (see line 98) BRITISH STANDARDBS 3S 98:20142 The British Standards Institution 2014Table 1 Technical re
23、quirements for 2.5% nickel-chromium-molybdenum steel forging stock andforgings29 Reference heat treatment Hardened + tempered820C 850C/ OQ + 500C 660C/AC44 External defects Forging stock: See Section 5 of BS S 100 Forgings: See Section 1 of BS S 10050 Cleanliness/inclusion count See Section 1 and An
24、nex B of BS S 10061 Internal defects See Section 1 and Annex C of BS S 10095 Marking See Section 1 of BS S 10096 Dimensional inspection See Section 1 of BS S 10098 Notes BRITISH STANDARD BS 3S 98:2014 The British Standards Institution 2014 3Table 2 Technical requirements for 2.5% nickel-chromium-mol
25、ybdenum steel black bar and brightbar1 Material designation BS 3S 982 Chemicalcomposition %Element C Si Mn P S Cr Mo Ni Al FeMin 0.36 0.10 0.45 0.50 0.45 2.30 0.015 BaseMax 0.44 0.35 0.70 0.025 0.015 0.80 0.65 2.80 0.0503 Method of melting Air melted by an electric process4.1 Form Black bar (S 98E)
26、and bright bar (S 98F) formachiningBlack bar (S 98B) and bright bar(S 98D) for machining4.2 Method of production 4.3 Limit dimension(s) mm aorD 1555 Technical specification Sections 1 and 2 of BS S 100 Sections 1 and 3 of BS S 1006.1 Delivery condition Black bar: SoftenedBright bar: Softened and sub
27、sequentlymachined or groundBlack bar: Hardened andtemperedBright bar: Hardened andtempered and cold drawn, coldrolled, machined or ground1)Heat treatment 820C 850C/OQ+ 500C 660C/AC 2)6.2 Delivery condition code AU7 Use condition Hardened and tempered Delivery conditionHeat treatment 820C 850C/ OQ +
28、500C 660C/AC2)Characteristics8.1 Test sample(s) See Section 2 of BS S 100 See Section 3 of BS S 1008.2 Test piece(s) See Section 2 of BS S 100 See Section 3 of BS S 1008.3 Heat treatment DeliveryconditionUse condition Use condition9 Dimensions concerned mm a or D 155 aorD 15510 Thickness of cladding
29、 oneach face%11 Direction of test piece L L12TTemperature C Ambient Ambient13 Proof stress Rp0.2MPa 1 000 1 00014 Strength RmMPa 1 160 Rm 1 310 1 160 Rm 1 31015 Elongation A% 10 1016 Reduction ofareaZ%17 Hardness 341 HBW 388 or 360 HV 410341 HBW 388 or 360 HV 41018 Shear strength RcMPa 19 Bending 20
30、 Impact strength ft-lbf 25 2521CTemperature C 22 Time h23 Stress a24 Elongation a%25RupturestressRMPa 26Elongation atruptureA%27 Notes (see line 98)1),2)BRITISH STANDARDBS 3S 98:20144 The British Standards Institution 2014Table 2 Technical requirements for 2.5% nickel-chromium-molybdenum steel black
31、 bar and brightbar44 External defects See Section 1 of BS S 10050 Cleanliness/inclusion count See Section 1 and Annex B of BS S 10061 Internal defects See Section 1 and Annex C of BS S 10095 Marking inspection See Section 1 of BS S 10096 Dimensional inspection See Section 1 of BS S 10098 Notes 1)Bar
32、s may be finally heat treated before or after cold drawing, cold rolling,machining or grinding2)Where bars delivered in the finally heat treated condition have been subjected toa cold straightening or cold rolling operation, they shall be given a stress relievingtreatment, which shall be sufficient
33、to restore the proof stress.BRITISH STANDARD BS 3S 98:2014 The British Standards Institution 2014 5BibliographyStandards publicationsFor these undated references, the latest edition of the referenced document(including any amendments) applies.BS EN 4500-1, Metallic materials Rules for the drafting a
34、nd presentation ofmaterial standards - Part 1: General rulesBS EN 4500-5, Metallic materials Rules for the drafting and presentation ofmaterial standards - Part 5: Specific rules for steelsBRITISH STANDARDBS 3S 98:20146 The British Standards Institution 2014This page deliberately left blankBSI is th
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