ISO INTERNATIONAL STANDARD 6934-1 First edition 1991-07-01 Steel for the prestressing of concrete - Part 1: General requirements Acier pour armatures de précontrainte Partie 1: Specifications genérales Reference number 1SO6934-1:1991(E) ISO 6934-1:1991(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for represented on that committee. International organizations, govern- mental and non-governmental, in liaison with Iso, also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at ieast 75 % of the member bodies casting a vote. International Standard Iso 6934-1 was prepared by Technical Committee ISO/TC 17, Steel. iso 6934 consists of the following parts, under the general titie Steel for the prestressing of concrete: Part 1: General requirements -.. Part 2: Cold-drawn wire --- Part 3: Quenched and tempered wire - Part 4: Strand Part 5: Hot-rolled steel bars with or without subsequent processing Annex A forms an integral part of this part of IsO 6934. Annexes B and C are for information only. C. 1SO 1991 Ali rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 CH-1211 Geneve 20 * Switzerland Printed in Switzerland ii Copyright International Organization for Standardization fromIHS Not for Resale ISO 6934-1:1991(E) INTERNATIONAL STANDARD Steel for the prestressing of concrete Part 1: General requirements 3.1 cast analysis: Chemical analysis of a sample Scope 1 of the molten steel during casting. 1.1 so 6934 specifies requirements for high 3.2 characteristic value: Value having a prescribed tensile strength steel to be used in prestressed probability of not being attained in a hypothetical concrete. It applies only to material in the condition unlimited test series. [Is0 8930] as supplied by the manufacturer.It does not cover requirements for materials and anchorage devices NOTE 1 Equivalent to fractile, which is defined in used in conjunction with the prestressing steel in ISO3534. structural components. 3.3 nominal cross-sectional area: The cross- 1.2 The specific properties for each type of pre- sectional area equivalent to the area of a circular stressing steel are given in ISO 6934-2 to 1SO 6934-5. plain bar of nominal diameter. 3.4 relaxation: Time-dependent stress loss for a 2 Normative references constant length. Relaxation is stated as a percent- age of the initial stress applied to the steel. The following standards contain provisions which, through reference in this text, constitute provisions of this part of isO 6934.At the time of publication, 4 Manufacturing process the editions indicated were valid. All standards are subject to revision, and parties to agreements based Steel according to Iso 6934 may be made by any on this part of isO 6934 are encouraged to investi. process except the air or mixed air/oxygen bottom gate the possibility of applying the most recent edi- blown processes. tions of the standards indicated below.Members of IEC and Iso maintain registers of currently valid International Standards. Types of prestressing steel Is0 1099:1975, Metals - Axial load fatigue testing. 5.1 Cold-drawn wire Iso 6892:1984, Metallic materials --- Tensile testing. A solid product obtained from a rod by cold working iso 7801:1984, Metallic materials -.. Wire -- Reverse through