BRITISH STANDARD BS 2B 8 1930 (Cancelling BS Specification B 8) Incorporating Amendment Nos 1 , 2 and 3 Specification for Aircraft material — Phosphor bronze castings for bearings — (including solid a[.]
BRITISH STANDARD Specification for Aircraft material — Phosphor bronze castings for bearings — (including solid and cored sticks) NO TE The As s ociation des ires to call attention to the fact that this S p ecification is intended to included to include the technical p rovis ions neces s ary for the s up p ly of the material herein referred to, b ut does not p urp ort to comp ris e all the neces s ary p rovis ions of a contract Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS 2B 8:1 930 (Cancelling BS Specification B 8) Incorporating Amendment Nos 1, and BS B 8: 93 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 C o mp liance with a British S tand ard doe s not o f itse lf co nfe r immunity fro m le gal ob ligations S ummary o f p age s This document comprises a front cover, an inside front cover, pages i and ii, pages and 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 Ame ndme nts issue d since p ub lication This Specification was approved by the Aircraft Industry Amd No Date of issue 7090 January Comments 941 Committee on the July 930, and published by the authority of the Council of the Association 305 as a British Standard on the 944 25 August 930 © BSI 01 - 2000 IS B N 1 X Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy November 41 35 December 982 Indicated by a sideline in the margin BS 2B 8:1930 Contents Page C hemical composition Freedom from defects Tensile test Provision of test samples Re- tests Identification Figure — Tensile test piece © BSI 01 - 000 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy i ii Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy blank BS B 8: 93 O b so le sce nt (by Amendment No 3) The need for the material covered by this British Standard has been reviewed and it has been decided that, in the interests of rationalization, it should be regarded as obsolescent and not therefore used for new designs The standard will be withdrawn in due course C he mical comp osition a) The chemical composition of the castings shall be: — Phosphorus — Not less then per cent Tin — Not less then 0 per cent — Not more than 50 per cent , of which Lead shall be not more — Total Impurities than 25 per cent ; Zinc nil Copper — — The remainder b) The Manufacturer shall supply, when required, the analysis of the castings to the Inspector Fre e dom from de fe cts a) The castings shall be clean, sound and free from blow- holes They shall be capable of being satisfactorily machined, i e , of taking a good finish b) No patching, plugging, or welding will be allowed unless previous permission in writing has been obtained from the Inspector c) Any casting may be rej ected for faults of manufacture, defects, or incorrectness of dimensions, whether discovered during inspection or subsequently during machining, notwithstanding that it has been passed previously as conforming to the analysis and mechanical tests of this Specification Te nsile te st a) The test pieces must comply with the following test, which shall be carried out in the presence of the Inspector and to his satisfaction b) Test samples cast as specified in Clause shall be machined to a form having a gauge length of four times the square root of the area (a suitable test piece is shown in Figure ) The testing appliances shall be such that the load when applied shall be axial Should a tensile test piece break outside the middle half of its gauge length the test may be discarded and another test made When tested in tension they must give the following results: — Maximu m S tre ss E lo ngati o n p e r ce nt To ns p e r sq in Not less than: — Chill Castings — 16 Not less than ; and not more than — 10 Not less than ; (Including Solid and Cored Sticks) Sand Castings c) The test samples shall not be treated in any manner otherwise than the castings they represent before they are tested Provision of te st samp le s a) Chill Castings (including Solid and Cored Sticks) Test samples shall be taken from the castings when possible When this is not possible and also in all cases of bushes and sticks over inch diameter the test samples shall be cast inch in diameter and from to inches long, in iron chills which have been heated before they are filled At least one test sample shall be cast to represent each one cwt of metal or less cast at the same time © BSI 01 - 2000 Reprodu ced by I H S u n d er l i cen se wi th BSI - U n trol l ed Copy BS 2B 8:1 930 b) Sand Castings Wherever possible, test samples shall b e cast integral with the castings, and of the ruling thickness of the castings At least one test sample shall b e cast to represent each large casting For small castings, at least one test sample shall be cast to represent each one cwt of metal or less cast at the same time Where the test samples cannot b e cast integral with the castings, they shall b e cast inch in diameter and from to inches long in moulds of similar materials to those used for the castings they represent Where castings are made directly from a melt of the alloying constituents, one test sample shall b e cast and tested to represent each cast or cwt whichever is the greater weight There castings are made b y remelting alloying ingot which has previously b een proved to comply with the mechanical test requirements of the Specification, one test sample shall b e cast and tested to represent each cast or cwt whichever is the greater weight Re-tests If a test sample selected for testing fails to meet the requirements the Specification, two further test samples, representing the same castings as the original one which failed, shall b e selected b y the Inspector and tested in the same manner If either of these test samples fails to meet the requirements of the Specification, the whole parcel represented may b e rej ected Identification All castings passed b y the Inspector shall be labelled or made into parcels and lab elled with the Specification Number, the identification mark of the Inspector and the Manufacturer’s trade mark or symb ol Figure — Tensile test piece Reprodu ced by I H S u n d er l i cen se wi th BSI - 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