1、BRITISH STANDARD AEROSPACE SERIES BS S 162:1990 Incorporating Amendments Nos. 1 and 2 Specification for 18 % nickel-cobalt- molybdenum maraging steel for forging stock, forgings, bars and parts (1800 MPa: double vacuum melted)BS S 162:1990 This British Standard, having been prepared under the direct
2、ion 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 October-2005 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment 89/75368 DC ISBN 0 580 18
3、986 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/15 upon which the following bodies were represented: British Forging Industry Association British Independent S
4、teel Producers Association British Industrial Fasteners Federation British Investment Casting Trade Association British Steel Industry British Steel Industry (Wire Section) Civil Aviation Authority (Airworthiness Division) Institute of British Foundrymen Ministry of Defence National Association of S
5、teel Stockholders Rolls-Royce Limited Seamless Steel Tube Association Society of British Aerospace Companies Limited Steel Casting Research and Trade Association Amendments issued since publication Amd. No. Date of issue Comments 6373 July 1991 16005 October 2005 Indicated by a sideline in the margi
6、nBS S 162:1990 BSI 17 October-2005 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 References 1 3 Technical requirements 1 Table 1 Technical requirements for 18 % Ni-Co-Mo maraging steel 2BS S 162:1990 ii BSI 17 October-2005 Foreword This British Standard has bee
7、n prepared under the direction of the Aerospace Standards Policy Committee and is a revision of MoD (PE) Specification DTD 5212, which it supersedes. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correc
8、t application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have
9、had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS S 162:1990 BSI 17 October-2005 1 1 Scope This British Standard specifies the chemical composition, mechanical properties and inspection and test requirements for an 18 % nickel-cobalt-molybdenum m
10、araging steel (iron base, Ni 18, Co 7.75, Mo 4.9) supplied in the following 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,
11、 columns 7, 8 and 9 of Table 1; d) bright bars for machining, designation S 162D, columns 10, 11 and 12 of Table 1. 2 References This 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)
12、. BS EN 2500, Guidelines for the preparation and use of standards for metallic materials 1) . 3 Technical requirements 3.1 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 conjun
13、ction with BS S 100, as given in Table 1, or as given in 3.3 to 3.5. 3.3 One sample from 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 con
14、dition and shall comply with sections 1 and 7 of BS S 100. (Text deleted) 3.6 Where it is necessary 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 tr
15、eatment details shall be stated on the certificate of conformity. 1) In preparation.BS S 162:1990 2 BSI 17 October-2005 Table 1 Technical requirements for 18 % Ni-Co-Mo maraging steel 1 Chemical composition % Element N C Si Mn P S Al B Ca Co Cr Mo Ni Ti Zr Fe min. 0.05 7.0 4.6 17.0 0.30 Base max. 0.
16、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 0.02 2 1 2 3 4 5 6 3 Method of melting Vacuum induction melted and vacuum arc remelted 4 Form Method of production Limit dimensions Forging stock Forgings 5 Acceptance standards Sections 1 and 5 of BS S 100 Sections 1 and 6 of BS
17、 S 100 6 Condition of supply and heat treatment prior to delivery As forged or as rolled Solution treated 820 C 10 C/AC (1) 7 Condition of use and heat treatment prior to use As supplied Condition of supply and maraged = 485 C 10 C/ W 3 h/AC 8 Test piece Heat treatment Sampling Reference heat treatm
18、ent See line 29 As condition of supply Reference heat treatment see line 29 9 Dimensions concerned D or a mm 75 W75 75 W 75 10 Thickness of cladding on each face % 11 Direction of sample L T L T 12 Tensile Temperature C Ambient temperature 13 Proof stress R p0.2 MPa W 1 700 W 1 700 14 Strength R m M
19、Pa 1 800 u R mu 2 000 1 800 u R mu 2 000 15 Elongation A % W 8 W 5 W 8 W 5 16 Reduction of area Z % W 40 W 25 W 40 W 25 17 Hardness HV 520 u HV u 620 u 335 or u 321 HB 520 u HV u 620 18 Shear strength R c MPa 19 Bending (r = k a) k 20 Impact Izod ft.lb W 18 W 8 W 18 W 8 29 Reference heat treatment S
20、olution treated and maraged = 820 C 10 C/air cool (1) = 485 C 10 C/ W 3 h/air cool 34 Grain size check (2) ASTM 5 or finer; occasional grains as large as ASTM 3 permitted 44 Non destructive testing Ultrasonic check in accordance with BS S 100 60 Micro cleanness check In accordance with BS S 100 97 D
21、esignation S 162A S 162C 98 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) Grain size to be measured on material in the finally heat treated condition.BS S 162:1990 BSI 17 October-2005 3 Table 1 Technical requirements for 18 %
22、Ni-Co-Mo maraging steel 1 Chemical composition % Element N C Si Mn P S Al B Ca Co Cr Mo Ni Ti Zr Fe min. 0.05 7.0 4.6 17.0 0.30 Base max. 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 0.02 2 1 7 8 9 10 11 12 3 Method of melting Vacuum induction melted and vacuum arc remelt
23、ed 4 Form Method of production Limit dimensions Black bars forged or rolled Bright bars forged or rolled machined or ground 5 Acceptance standards Sections 1 and 2 of BS S 100 6 Condition of supply and heat treatment prior to delivery Solution treated 820 C 10 C/AC (1) 7 Condition of use and heat tr
24、eatment prior to use Condition of supply and maraged = 485 C 10 C/ W 3 h/AC 8 Test piece Heat treatment Sampling As condition of supply Reference heat treatment See line 29 As condition of supply Reference heat treatment See line 29 9 Dimensions concerned D or a mm 75 W 75 75 W 75 10 Thickness of cl
25、adding on each face % 11 Direction of sample L T L T 12 Tensile Temperature C Ambient temperature 13 Proof stress R p0.2 MPa W 1 700 W 1 700 14 Strength R m MPa 1 800 u R mu 2 000 1 800 u R mu 2 000 15 Elongation A % W 8 W 5 W 8 W 5 16 Reduction of area Z % W 40 W 25 W 40 W 25 17 Hardness HV u 335 o
26、r u 321 HB 520 u HV u 620 u 335 or u 321 HB 520 u HV u 620 18 Shear strength R c MPa 19 Bending (r = k a) k 20 Impact Izod ft.lbs W 18 W 8 W 18 W 8 29 Reference heat treatment Solution treated and maraged = 820 C 10 C/AC (1) = 485 C 10 C/ W 3 h/AC 34 Grain size check (2) ASTM 5 or finer; occasional
27、grains as large as ASTM 3 permitted 44 Non destructive testing Ultrasonic check in accordance with BS S 100 60 Micro cleanness check In accordance with BS S 100 97 Designation S 162B S 162D 98 Notes (1) The time at temperature shall be between 30 min and 60 min per 25 mm of section but not less than
28、 30 min. (2) Grain size to be measured on material in the finally heat treated condition.BS S 162:1990 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in
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