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BS B : 009 BSI British Standards AE RO S PACE S E RI E S S pe ci f ca ti on for coppe r‑be ryl l i u m a l l oy stri p a n d foi l (sol u ti on tre a ted , col d rol l ed : fu l l h a rd a n d preci pi ta ti on tre a ted ) NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide ™ BS 3B 31 :2009 BRITISH STAN DARD Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was l ast issued © BSI 2009 ISBN 978 580 62846 ICS 49.025.1 The foll owing BSI references rel ate to the work on this standard: Committee reference ACE/61 Draft for comment 09/301 81 207 DC Publication history First publ ished June 991 Second edition December 2001 Third (present) edition, N ovember 2009 Amendments issued since publication Date Text affected BRITISH STAN DARD BS 3B 31 :2009 Contents Foreword ii Scope N orm ative references Technical requirem ents Bibliography List of tables Table – Technical requirements for Cu-Be alloy strip and foil (solution treated, cold rolled: fully hard and precipitation treated) Summ ary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages to 4, an inside back cover and a back cover © BSI 2009 • i BS 3B 31 :2009 BRITISH STAN DARD Foreword Publishing information This British Standard is published by BSI and came into effect on 30 N ovember 2009 It was prepared by Panel ACE/61 /-/1 6, , under the authority of Technical Committee ACE/61 , A list of organizations represented on this com mittee can be obtained on request to its secretary Co p p e r a n d m isce lla n e o u s a llo ys Me ta llic m a te ria ls fo r a e ro sp a ce p u rp o se s Supersession This British Standard supersedes BS 2B 31 :2001 , which is withdrawn Information about this document This is a full revision of BS 2B 31 and introduces the following principal changes: a) requirem ents are stated in tabular form at in accordance with EN 4500-1 ; b) references to parts have been deleted Hazard warnings WARNING This British Standard calls for the use of substances and/or procedures that can be injurious to health if adequate precautions are not taken It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage Use of this document It has been assumed in the preparation of this British Standard that the execution of its provisions will be entrusted to appropriately quali f ed and experienced people, for whose use it has been produced Presentational conventions The provisions of this standard are presented in roman (i.e upright) type Its requirements are expressed either as a set of instructions or in sentences in which the principal auxiliary verb is “ shall” Co m m e n ta ry, exp la n a tio n a n d gen era l in fo rm a tive m a teria l is p re se n ted in sm a ller ita lic typ e, a n d es n o t co n stitute a n o rm a tive elem en t Contractual and legal considerations This publication does not purport to include all the necessary provisions of a contract U sers are responsible for its correct application Compliance with a British Standard cannot confer immunity from legal obligations ii ã â BSI 2009 BRITISH STAN DARD BS 3B 31 :2009 Scope This British Standard speci f es requirements for copper-beryllium alloy supplied in the form of strip and foil N orm ative references The following referenced docum ents are indispensable for the application of this docum ent For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies BS B 00, Procedure for inspection, testing and acceptance of wrought copper alloys BS EN 654, Copper and copper alloys – Strip for springs and connectors Technical requirements 3.1 M aterial to this standard shall conform to Table NOTE The format and symbols used in Table are derived from EN 4500-1 3.2 For the purposes of this standard, a batch shall be material of the sam e nominal cross-sectional dim ensions, from the sam e cast, manufactured by the same route and heat treated together © BSI 2009 • BS 3B 31 :2009 Table BRITISH STAN DARD Te ch n i ca l re q u i re m e n ts fo r Cu ‑B e a l l o y stri p a n d fo i l (so l u ti o n tre a te d , co l d ro l l e d : fu l l y h a rd a n d p re ci p i ta ti o n tre a te d ) M a te ri a l d e s i g n a ti o n Ch e m i ca l BS B Element co m p o si ti o n % Be Co + N i Co + Fe + N i Al Si Others M in 80 0.20 — — — —- M ax 2.00 — 0.6 0.20 0.20 0.50 M e th o d o f m e l ti n g — Fo rm Strip and foil M e th o d o f p ro d u cti o n Rolled Li m i t d i m e n s i o n (s ) Te ch n i ca l sp e ci D e l i ve ry co n d i ti o n Solution treated + cold rolled (H ) H e a t tre a tm e n t 760 °C D e l i ve ry co n d i ti o n co d e — U s e co n d i ti o n Solution treated + cold rolled (H ) + precipitation treated H e a t tre a tm e n t Delivery condition + 31 °C f mm 0.1 G a G 3.0 Sections and of BS B 00 ca ti o n G h G 835 °C / Quench ) G h G 330 °C / t = h / AC Ch a cte ri sti cs Te st sa m p l e (s ) See Section of BS B 00 Te st p i e ce (s ) See Section of BS B 00 H e a t tre a tm e n t Delivery condition D i m e n s i o n s co n ce rn e d mm 0.1 10 Th i ckn e s s o f cl a d d i n g o n % — U se condition G a G 3.0 0.1 G a G 3.0 e a ch fa ce 11 D i re cti o n o f te st p i e ce 12 Te m p e tu re 13 Pro o f s tre ss 14 T S tre n g th L T L Ambient Ambient Ambient — H1 — 31 — H1 h °C R p0.2 M Pa — Rm M Pa 690 15 E l o n g a ti o n A % H2 16 Re d u cti o n o f Z % — G R m G 830 40 G Rm G 500 a re a 17 H a rd n e ss 18 S h e a r s tre n g th 19 Ben d i n g 20 I m p a ct s tre n g th 21 Te m p e tu re 22 Ti m e 23 24 S tre s s C E l o n g a ti o n 25 Ru p tu re stre s s 26 E l o n g a ti o n a t 21 Rc M Pa j — (α = 90°) °C — h — M Pa — a % — rR M Pa — A % — ru p tu re 27 N o te s (see line 98) ã â BSI 2009 380 h G H V G 290 1) 3.0 (α = 90°) — G H V G 450 Cu Base BRITISH STAN DARD Table BS 3B 31 :2009 Te ch n i ca l re q u i re m e n ts fo r Cu ‑B e a l l o y stri p a n d fo i l (so l u ti o n tre a te d , co l d ro l l e d : fu l l y h a rd a n d p re ci p i ta ti o n tre a te d ) (continued) 44 E xte rn a l d e fe cts — See Section of BS B 00 95 M a rki n g — See Section of BS B 00 96 D i m e n s i o n a l i n s p e cti o n — BS EN 654 class A 98 N o te s 1) Quenching shall be effected by forced air, sprayed water or immersion in oil or water © BSI 2009 • BS 3B 31 :2009 BRITISH STAN DARD Bibliography Standards publications For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 4500-1 , Metallic materials – Rules for the drafting and presentation of material standards – Part : General rules ) 1) • © BSI 2009 Publ ished as ASD-STAN Prestandard at the date of publication of this standard This page deliberately left blank B ri ti sh Stan d a 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