ISO-TR-11637-1997.pdf
TECHNICAL REPORT ISOKR 11637 First edition 1997-12-15 Boron treated engineering steels for quenching and tempering Aciers de construction mkanique trait - type 2, when the subject is still under technical development or where for any other reason there is the future but not immediate possibility of an agreement on an International Standard; - type 3, when a technical committee has collected data of a different kind from that which is normally published as an International Standard (“state of the art”, for example). Technical Reports of types 1 and 2 are subject to review within three years of publication, to decide whether they can be transformed into International Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid or useful. ISOITR 11637, which is a Technical Report of type 2, was prepared by Technical Committee ISOI TC 17, Steel Subcommittee SC 4, Heat treatable and alloy steels. 0 IS0 1997 All rights reserved. Unless otherwise specified, 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 l CH-1211 Geneve 20 l Switzerland Internet centralQiso.ch x.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 01:31:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 IS0 ISO/TR 11637:1997(E) This document is being issued in the Technical Report (type 2) series of publications (according to subclause G.3.2.2 of part 1 of the ISO/IEC Directives, 1995) as a “prospective standard for provisional application” in the field of boron treated engineering steels because there is an urgent need for guidance on how standards in this field should be used to meet an identified need. This document is not to be regarded as an “International Standard”. It is proposed for provisional application so that information and experience of its use in practice may be gathered. Comments on the content of this document should be sent to the IS0 Central Secretariat. A review of this Technical Report (type 2) will be carried out not later than three years after its publication with the options of: extension for another three years; conversion into an International Standard; or withdrawal. Annex A forms an integral part of this Technical report. Annex B is for information only. III Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 01:31:58 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 11637:1997(E) IS0 Introduction For the following two reasons the attempt to establish an International Standard for boron treated engineering steel for quenching and tempering has proved especially difficult. a) The number of types of these steels, applied until now mostly as company grades, is very great world-wide, so that concentration on a reasonable number of internationally standardized steels has caused problems. b) The hardenability of these steels can, even for types with the same specified chemical composition, vary greatly because of differences in the effectiveness of the boron and in the content of residual elements. Consequently, it seemed reasonable to specify tight limits for only the most important characteristic of these steels, namely the hardenability, and to permit relatively wide ranges for the carbon, manganese and chromium contents. In this way manufacturers have the possibility of complying with the tight hardenability requirements independent of the melting procedure applied. For the reasons given under b) the proposals of the various members for the hardenability of the individual steels differed significantly. The hardenability scatterbands specified in table 5 and figure 1 were therefore mainly derived with the help of formulae established by what is considered world-wide as the greatest customer of boron treated steels and published in ASTM A 255. It is to be expected that the application of the specifications in this document will not cause any problems. Nevertheless, it was agreed to publish this first edition not as an International Standard but as an IS0 Technical Report of type 2 so that for a trial period of three years information and experience of its use in practice can be gathered. iv Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 01:31:58 MDTNo reproduction or networking permitted without license from IHS -,-,- TECHNICAL REPORT o IS0 lSO/TR 11637: 1997(E) Boron treated engineering steels for quenching and tempering 1 Scope 1 .l This Technical Report gives the technical delivery requirements for - semi-finished products, for example blooms, billets, slabs (see note 3 below); - bars (see note 3 below); - wire rod; - hot or cold rolled sheet/plate and strip (see note 2 below); - hammer or drop forgings (see note 3 below). These articles are manufactured from the boron alloy steels listed in table 3 and supplied in one of the heat- treatment conditions given for the different types of products in table 1, lines 2 to 5 for columns 4 to 8 and in one of the surface conditions given in table 2. The steels are in general intended for the fabrication of quenched and tempered or austempered (see 3.3 and note 1 below) machine parts. This Technical Report is not applicable for steels for cold heading which are covered by IS0 4954. NOTES 1 For the purpose of simplification the term “quenched and tempered” is, unless otherwise indicated, used in the following also for the austempered condition. 2 The terms “plate” or “flat product” in the following also include, unless otherwise stated, wide flats. 3 Hammer-forged semi-finished products (blooms, billets, slabs, etc.) and hammer-forged bars are in the following covered under semi-finished products or bars and not under the term “hammer and drop forgings”. 1.2 In special cases, variations in these technical delivery requirements or additions to them may form the subject of an agreement at the time of enquiry and order (see annex A). 1.3 In addition to this Technical Report, the general technical delivery requirements of IS0 404 are applicable. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this Technical Report. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Technical Report are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 01:31:58 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 11637: 1997(E) 0 IS0 IS0 148: 1983, Steel - Charpy impact test (V-notch). IS0 377:1997, Steel and steel products - Location and preparation of test pieces for mechanical testing. IS0 404: 1992, Steel and steel products - General technical delivery requirements. IS0 642:1979, Steel - Hardenability test by end quenching (Jominy test). IS0 643: 1983, Steels - Micrographic determination of the ferritic or austenitic grain size. IS0 1035-l :1980, Hot-rolled steel bars - Part 1: Dimensions of round bars. IS0 10352:1980, Hot-rolled steel bars - Part 2: Dimensions of square bars. IS0 1035-3:1980, Hot-rolled steel bars - Part 3: Dimensions of f/at bars. IS0 10354:1982, Hot-rolled steel bars - Part 4: Tolerances. IS0 3887:1976, Steel, non-alloy and low-alloy - Determination of depth of decarburization. IS0 4948-l :1982, Steels - Classification - Part 1: Classification of steels into unalloyed and alloy steels based on chemical composition. IS0 4948-2:1981, Steels - Classification - Part 2: Classification of unalloyed and alloy steels according to main quality c/asses and main property or application characteristics. IS0 4954: 1993, Steels for cold heading and cold extruding. IS0 4967:-l), Steel - Determination of content of non-metallic inclusions - Micrographic method using standard diagrams. IS0 6506-l :-2), Metallic materials - Brine/ hardness tests - Part 1: Test method. IS0 6892:-3), Metallic materials - Tensile testing at ambient temperature. IS0 6929:1987, Steel products - Definitions and classification. IS0 7452:1984, Hot-rolled structural steel plates - Tolerances on dimensions and shape. IS0 7788:1985, Steel - Surface finish of hot-rolled plates and wide flats - Delivery conditions. IS0 9443:1991, Heat-treatable and alloy steels - Surface quality c/asses for hot-rolled round bars and wire rods - Technical delivery conditions. IS0 10474:1991, Steel and steel products - inspection documents. IS0 14284:1996, Steel and iron - Sampling and preparation of samples for the determination of chemical composition. 1) To be published. (Revision of IS0 4967:1979) 2) To be published. (Revision of IS0 6506:1981 and IS0 410:1982) 3) To be published. (Revision of IS0 6892:1984) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 01:31:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 IS0 ISO/TR 11637:1997(E) 3 Definitions For the purposes of this Technical Report the following definitions apply: 3.1 different forms of product: See IS0 6929 and the notes to 1 .l. 3.2 ruling section: That section for which the specified mechanical properties shall apply. NOTE - Independent of the actual shape and dimensions of the cross-section of the product the size of its ruling section is always given by a diameter. This corresponds to the diameter of an “equivalent round bar”. That is a round bar which, at the position of its cross-section specified for taking the test pieces for the mechanical tests, will, when being cooled from austenitizing temperature, show the same cooling rate as the actual ruling section of the product concerned at its position for taking the test pieces. 3.3 austempering: Austenitization of a steel with subsequent cooling to a temperature in the bainite region and holding at this temperature until a desired degree of transformation is obtained. The subsequent cooling to room temperature can be carried out in any manner desired. 3.4 alloy steel: See clause 3 of IS0 4948-l :1982. 3.5 special steel: See 4.2.4 of IS0 4948-2:i 981. 4 Ordering and designation The designation of the product in an order shall cover the following. a) The designation of the product form (bloom, bar, rod, etc.) followed by - either the designation of the dimensional standard and the dimensions and tolerances selected from this (see 5.7), or - in the case of drop forgings, by the designation of the drawing or any other document covering the dimensions and tolerances required for the product. b) If a surface condition other than “hot worked” or a special surface quality is required - the surface condition (see table 2); - the surface quality (see 5.6). c) A description of the steel comprising 1) a reference to this Technical Report; 2) the designation of the steel type given in table 3; 3) if a heat-treatment condition other than the untreated condition is required, the symbol for this other condition (see table 1, column 3); NOTE - If the quenched and tempered condition is ordered, the mechanical properties should also be agreed when ordering (see 5.2.3). 4) if an inspection document is required, the type of inspection document (see IS0 10474); 5) if any supplementary requirement shall be complied with, the symbol and, where necessary, the details of this supplementary requirement (see annex A). 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 01:31:58 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/TR 11637: 1997(E) 0 IS0 EXAMPLE To be ordered are: Hot-rolled round bars: - in accordance with IS0 1035-1, with: - a nominal diameter of 40,O mm; - a nominal length of 8 000 mm; - a diameter tolerance of + 0,40 mm (= class S in accordance with IS0 10354:1982); - a length tolerance of + yoo mm (= class L2 of IS0 10354:1982); - all other tolerances as given in IS0 1035-4 for normal cases. Surface: - blast cleaned (symbol +BC, see table 2). Steel: - in accordance with lSO/TR 11637; -type 40MnCrB4-2; - heat-treatment condition: treated for shearability (symbol +S, see table 1); - with an inspection certificate 3.1 .B according to IS0 10474; - ultrasonically tested (supplementary requirement specified in clause A.3) in accordance with test sheet xy. Designation: - rounds: IS0 1035-l-40,0 S x 8 000 L2 - surface: +BC - steel and heat treatment: lSO/TR 11637-40MnCrB4-2+S - inspection document: IS0 10474-3.1 .B - supplementary requirement: A.3 - ultrasonic test -, see test sheet xy. 5 Requirements 5.1 Manufacturing process 5.1 .I General The manufacturing process of the steel and of the products is, with the restrictions given by the requirements in 5.1.2 to 5.1.4, left to the discretion of the manufacturer. 5.1.2 Deoxidation All steels shall be treated so that the boron improves hardenability. 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 01:31:58 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 IS0 lSO/T R 11637:1997(E) 5.1.3 Heat treatment and surface condition at delivery 5.1.3.1 Normal condition at delivery Unless otherwise agreed at the time of enquiry and order, the products shall be delivered in the untreated, that means hot-worked, condition. 5.1.3.2 Particular heat-treatment condition If so agreed at the time of enquiry and order, the products shall be delivered in one of the particular heat treatment conditions given in table 1, lines 3 to 5. 5.1.3.3 Particular surface condition If so agreed at the
