1、A N A M E R I C A N N A T I O N A L S T A N D A R D Preferred Metric Sizes for Flat Metal Products ANSI/ASME B32.3M-1984 FOR CURRENT COMMliTEE PERSONNEL PLEASE SEE ASME MANUAL AS-1 1 SPONSORED AND PUBLISHED BY T H E A M E R I C A N S O C I E T Y O F M E C H A N I C A L E N G I N E E R S United Engin
2、eering Center 345 East 47th Street New York,N.Y.1001 7 Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:February 28,1985 T
3、his Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written interpretations of the requirements of this Standard issued to this Edition.This code or standard was developed under procedures accredited as meeting the criteria for American Na
4、tional Standards.The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment which provides an opportuni
5、ty for additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not approve,rate,or endorse any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with a
6、ny items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assume any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent r
7、ights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative($)or person(s)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only th
8、ose interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of t
9、he publisher.Copyright 1985 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Unc
10、ontrolled when printed.FOREWORD(This Foreword is not part of American National Standard ANSI/ASME B32.3M-1984.)The U.S.Department of Commerce,in its July 1971 report to Congress titled“A Metric America-A Decision Whose Time Has Come,”recommended that the United States should change to the metric sys
11、tem of measurement through a coordinated national program.This action along with subsequent increased metric activity in industry resulted in a number of re-quests from producers and users that the B32 Committee develop preferred series of metric sizes for the various forms of wrought metal mill pro
12、ducts.On January 17,1973,Subcommittees 1 and 2 were formed to establish preferred metric sizes of flat and round metal products,respectively.Subsequently,Subcommittee 2 had its scope en-larged to include square and hexagon products.Subcommittee 4 was formed on October 24,1973,to consider tubular pro
13、ducts.These subcommittees are composed of representatives of the major metal trade associations and user groups.After several meetings unanimous agreement was reached by Subcommittee 1 on the preferred metric thicknesses for flat metal products and on the preferred metric widths for flat rectangu-la
14、r cross section metal products.Three considerations guided the Subcommittee:preferred num-ber sizes included in IS0 Recommendation R388,sizes actually used in metric countries,and rounded metric equivalents of high activity inch sizes used in the United States.The proposal received Standards Committ
15、ee B32 approval on June 4,1974.It was subse-quently approved by the sponsor and submitted to the American National Standards Institute for designation as an American National Standard.This was granted on July 9,1974.The first edition was very favorably received and the dynamic metrication planning a
16、ctivity which it generated prompted the Committee to expand the coverage.Requests were received to extend the range of thicknesses from 160 mm to 300 mm and to establish a series of preferred lengths for products within the limits of Tables 1 and 2 which are supplied in straight lengths.This was done after due deliberation.In addition,a 4.2 mm second preference thickness which was inadvertently omitted in the first edition was restored,and fifteen third preference thick-nesses were included.Also
