This 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 forms and as parts for general aerospace use:<\/p>\n
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| 1<\/td>\n | BRITISH STANDARD AEROSPACE SERIES BS S 162:1990 Specification for 18 % nickel-cobalt- molybdenum maraging steel for forging stock, forgings, bars and parts (1800 MPa: double vacuum melted) <\/td>\n<\/tr>\n | ||||||
| 2<\/td>\n | This 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 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 Steel Producers\u2019 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 Steel Stockholders Rolls-Royce Limited Seamless Steel Tube Association Society of British Aerospace Companies Limited Steel Casting Research and Trade Association <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | Contents <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | Foreword This British Standard has been 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 correct 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 had amendments incorporated. This will be indicated in the amendment table on the inside front cover. <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | 1 Scope This British Standard specifies the chemical composition, mechanical properties and inspection and test requirements for an 18 %… 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 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). BS EN 2500, Guidelines for the preparation and use of standards for metallic materials. 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 conjunction 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 condition 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 \u00b1 10\u00baC fol… <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | Table 1 – Technical requirements for 18 % Ni-Co-Mo maraging steel 1 Chemical composition % Element 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. 0.010 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 S 100 6 Condition of supply and heat treatment prior to delivery As forged or as rolled Solution treated 820 \u00b0C \u00b1 10 \u00b0C\/AC (1) 7 Condition of use and heat treatment prior to use As supplied Condition of supply and maraged \u2044 = 485 \u00b0C \u00b1 10 \u00b0C\/W 3 h\/AC 8 Test piece Heat treatment Sampling Reference heat treatment 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 \u2044 \u00b0C Ambient temperature 13 Proof stress Rp0.2 MPa W 1 700 – W 1 700 14 Strength Rm MPa 1 800 u Rm u 2 000 – 1 800 u Rm u 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 Rc MPa – 19 Bending (r = k \u00d7 a) k – – 20 Impact Izod ft.lb W 18 W 8 – W 18 W 8 29 Reference heat treatment Solution treated and maraged \u2044 = 820 \u00b0C \u00b1 10 \u00b0C\/air cool (1) \u2044 = 485 \u00b0C \u00b1 10 \u00b0C\/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 Designation 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. <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Table 1 – Technical requirements for 18 % Ni-Co-Mo maraging steel 1 Chemical composition % Element 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. 0.010 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 remelted 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 \u00b0C \u00b1 10 \u00b0C\/AC (1) 7 Condition of use and heat treatment prior to use Condition of supply and maraged \u2044 = 485 \u00b0C \u00b1 10 \u00b0C\/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 cladding on each face % – 11 Direction of sample – L T – L T 12 Tensile Temperature \u2044 \u00b0C Ambient temperature 13 Proof stress Rp0.2 MPa – W 1 700 – W 1 700 14 Strength Rm MPa – 1 800 u Rm u 2 000 – 1 800 u Rm u 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 or u 321 HB 520 u HV u 620 u 335 or u 321 HB 520 u HV u 620 18 Shear strength Rc MPa – 19 Bending (r = k \u00d7 a) k – – 20 Impact Izod ft.lbs – W 18 W 8 – W 18 W 8 29 Reference heat treatment Solution treated and maraged \u2044 = 820 \u00b0C \u00b1 10 \u00b0C\/AC (1) \u2044 = 485 \u00b0C \u00b1 10 \u00b0C\/W 3 h\/AC 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 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 30 min. <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 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 Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an ina… BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical… Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase pri… Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the internationalsta… This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size,… If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Specification for 18% nickel-cobalt-molybdenum maraging steel forging stock, forgings, bars and parts (1800 MPa: double vaccuum melted)<\/b><\/p>\n |