EN 10139

BRITISH STANDARD BS EN 10139:1998 Cold rolled uncoated mild steel narrow strip for cold forming — Technical delivery conditions The European Standard EN 10139:1997 has the status of a British Standard ICS 77.140.50 BS EN 10139:1998 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1998 © BSI 02-2000 ISBN 0 580 29563 X National foreword This British Standard is the English language version of EN 10139:1997. It supersedes BS 1449:Section 1.9:1991 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/10, Flat rolled steel products, which has the responsibility to: — aid enquirers to understand the text; — present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; — monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 13 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. Amendments issued since publication Amd. No. Date Comments BS EN 10139:1998 © BSI 02-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 10139 3 ii blank EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 10139 November 1997 ICS 77.140.50 Descriptors: Cold rolled products, strips, low carbon steels, unalloyed steels, cold-working, classifications, grades: quality, delivery conditions, designation, characteristics, tests English version Cold rolled uncoated mild steel narrow strip for cold forming — Technical delivery conditions Feuillards non revêtus laminés à froid en aciers doux pour formage à froid — Conditions techniques de livraison Kaltband ohne Überzug aus weichen Stählen zum Kaltumformen — Technische Lieferbedingungen This European Standard was approved by CEN on 24 November 1996. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10139:1997 E EN 10139:1997 © BSI 02-20002 Foreword The European Standard has been prepared by Technical Committee ECISS/TC 13, Flat products for cold working — Qualities, dimensions, tolerances and specific tests, the secretariat of which is held by IBN/BIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 1998, and conflicting national standards shall be withdrawn at the latest by May 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definition 3 4 Classification of grades and delivery condition 3 5 Designation 4 6 Properties 4 6.1 Production processes and chemical composition 4 6.2 Choice of properties 4 6.3 Mechanical and technological properties 4 6.4 Surface characteristics 4 6.5 Stretcher strains 5 6.6 Suitability for the application of surface coatings 5 6.7 Weldability 5 6.8 Dimensions, mass, permissible tolerances 5 7 Testing 5 7.1 Agreement of acceptance testing 5 7.2 Acceptance units and number of tests 5 7.3 Sampling and preparation of test pieces 5 7.4 Test methods to be followed 5 7.5 Re-tests 6 8 Marking 6 9 Oiling 6 10 Packing 6 11 Information to be supplied by the purchaser 6 12 Disputes 6 Annex A (normative) Method of determination of the plastic strain ratio r 10 Annex B (normative) Method of determination of strain hardening exponent n 11 Annex C (informative) List of national standards complying with the euronorms given in the references 13 Table 1 — Characteristics 7 Table 2 — Surface appearances and finishes 9 Table A.1 10 Table B.1 12 Table C.1 — Euronorms and corresponding national standards 13 EN 10139:1997 © BSI 02-2000 3 1 Scope 1.1 This European Standard applies to cold rolled narrow strip in coils and cut lengths in thicknesses up to 10 mm and of widths less than 600 mm, made from mild, unalloyed and alloyed steels in accordance with Table 1. These products are suitable for cold forming. They are also suitable for surface coating. On the other hand, they are not suitable for hardening treatment followed by tempering. 1.2 This European Standard does not cover cold rolled flat products for which a separate standard already exists, particularly the following products: — cold rolled non oriented magnetic steel sheet and strip (EN 10106); — grain-oriented magnetic steel sheet and strip (EN 10107); — semi-processed steel strip for the construction of magnetic circuits (EN 10126 and EN 10165); — cold rolled narrow strip for the manufacture of springs (EURONORM 132); — high yield strength steels for cold forming (EN 10268); — cold rolled uncoated low carbon steel flat products for cold forming (EN 10130); — cold reduced blackplate (EN 10205); — sheet and strip for enamelling (EN 10209). 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate place in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 10002-1, Metallic materials — Tensile test — Part 1: Method of test (at ambient temperature). EN 10002-2, Metallic materials — Tensile test — Part 2: Verification of the force measuring system of the tensile testing machines. EN 10002-4, Metallic materials — Tensile test — Part 4: Verification of extensometer used in uniaxial testing1). EN 10020, Definition and classification of grades of steel. EN 10021, Steels and iron and steel products — General technical delivery conditions. EN 10027-1, Designation systems for steel — Part 1: Steel names, principal symbols. EN 10027-2, Designation systems for steel — Part 2: Numerical system. EN 10079, Definition of steel products. EN 10140, Cold rolled narrow strip — Tolerances on dimensions and shape. EN 10204, Metallic products — Types of inspection documents. EURONORM 5:1979, Vickers hardness test for steel2). EURONORM 18:1979, Sampling and preparation of test pieces for steel and iron and steel products2). EURONORM 49:1972, Measurement of the roughness of thin products made of cold rolled and uncoated steels2). CR 10260, Designation systems for steel — Additional symbols for steel names. 3 Definitions 3.1 For the purposes of this European Standard, the definitions of cold rolled flat products given in clause 1 are identical to those given in EN 10079. NOTE In the case of narrow widths, strip complying with this standard may also be wound in layers and supplied in the form of a bobbin wound coil. 3.2 After uncoiling and shearing, strip may be supplied in cut lengths. 4 Classification of grades and delivery condition 4.1 This European Standard specifies the grades listed in Table 1. In the case of steel grade DC01, the deoxidation method shall be left to the manufacturer’s discretion. Steel grades DC03, DC04, DC05 and DC06 shall be supplied fully killed. 4.2 Products manufactured from these steels may be ordered and supplied in different delivery conditions (see Table 1) and with different surface appearances (see 6.4 and Table 2). 4.3 For the purposes of the specifications of this European Standard, the selection of steel grade, delivery condition and surface finish are the responsibility of the purchaser. 1) Currently at draft stage. 2) Until they are transformed into European Standards, either the Euronorms or the corresponding national standards listed in Annex C of this European Standard may be used. EN 10139:1997 4 © BSI 02-2000 5 Designation The symbol designation of the steel grades in this European Standard is in conformity with EN 10027-1 and Information Circular ECISS IC 10; the numerical designation is allocated in conformity with EN 10027-2. The standard designation consists of the words narrow strip or cut lengths, followed in order by: a) reference to this European Standard, EN 10139; b) the symbol DC, followed by the grade designation (01, 03, 04, 05 and 06); c) the symbol for delivery condition (see Table 1); d) the symbol for surface appearance (MA, MB or MC, see Table 2); e) the symbol for surface finish where appropriate (RM or RR, see 6.4.3 and Table 2). Examples of standard designations: Designation of cold rolled steel narrow strip, grade DC04, in a lightly skin-passed condition (LC), with a “scratch and pit-free” surface appearance (MB) and a “matt” surface finish (RM): Narrow strip EN 10139-DC04 + LC MB RM Designation of cold rolled steel narrow strip, grade DC03, in the annealed condition (A), with “bright” (MA) surface appearance and a “smooth” surface finish: Narrow strip EN 10139-DC03 + AMA 6 Properties 6.1 Production processes and chemical composition 6.1.1 The steel making process of the steel shall be left to the manufacturer’s discretion. The production process of the product, where not stipulated in the order, shall also remain at the manufacturer’s discretion. 6.1.2 The chemical composition based on ladle analysis shall be as given in Table 1. 6.2 Choice of properties The products covered by this European Standard shall comply with the specifications given in Table 1 of this standard. If agreed separately, they may be supplied with a special suitability for making a particular part; in this case, a maximum percentage of processing scrap may be fixed by common agreement and acceptance tests on the basis of the mechanical properties shall not apply. 6.3 Mechanical and technological properties 6.3.1 The mechanical and technological properties of the products are given in Table 1. These properties are guaranteed for the periods specified in Table 1 with effect from the date that the products are made available for delivery. The purchaser shall be informed of this date when the products are to be made available, with a warning appropriate to the guarantee of mechanical properties. Storage of grade DC01 products for more than 3 months may cause a change in the mechanical properties likely to give rise to a reduction in the suitability for forming and drawing. 6.3.2 The usual test for checking the mechanical properties given in Table 1 is the tensile test. However, if agreed at the time of ordering, hardness values may be specified instead of tensile test properties, but not both. 6.3.3 The tensile test values shall apply to longitudinal test pieces. The requirements of 3.3.2 of EURONORM 18-79, shall not apply. 6.4 Surface characteristics 6.4.1 General Surface characteristics concern surface appearance and surface finish. These shall be specified by the purchaser at the time of ordering. Unless otherwise specified at the time of ordering, the products shall be supplied with a surface appearance MA and a smooth surface finish (RL; with Ra k 0,6 4m). 6.4.2 Surface appearance 6.4.2.1 Cold rolled flat products covered by this European Standard may be supplied with surface appearances MA, MB or MC as described in Table 2. The required surface appearance shall be stated in the designation (see clause 5). 6.4.2.2 The characteristics indicated in Table 2 apply to the surface actually inspected, which is generally the outside surface of coils and the top surface of lengths. The appearance of the uninspected surface shall correspond at least to surface appearance MA. These characteristics shall not apply to the first inner and outer laps of coil or to lengths cut from them. 6.4.3 Surface finish 6.4.3.1 The surface finish may be rough, matt, smooth or mirror finish, as given in Table 2. Products with surface appearances MA and MB are generally supplied with a smooth surface finish (RL). If rough (RR) or matt (RM) finishes are required, the corresponding symbol shall be given in the designation (see clause 5). EN 10139:1997 © BSI 02-2000 5 The surface appearance MC shall only be supplied with a “mirror” finish (RN). 6.4.3.2 The different surface finishes are characterized by the following reference values of mean roughness Ra: rough: Ra U 1,5 4m; matt: 0,6 4m < Ra k 1,8 4m; smooth: Ra k 0,6 4m; mirror finish: Ra k 0,2 4m. 6.5 Stretcher strains The tendency towards the formation of fractures or stretcher strains during forming may be eliminated for a time by light skin-passing (LC). The period of freedom from stretcher strains can be assumed to be three months for grade DC01 and six months for the other grades, from the agreed date when the product is available for delivery. 6.6 Suitability for the application of surface coatings 6.6.1 The products covered by this European Standard are suitable for surface coatings taking into account the following requirements: a) all the products shall be suitable for organic coating; b) all the products shall be suitable for the application of a metallic coating, e.g. zinc, tin or lead by means of hot dipping or thermal spraying; c) all the products with surface appearances MB or MC shall be suitable for electrolytic coating. 6.6.2 The application of surface coatings requires that the surface be suitably prepared before-hand by the processor. The type of coating shall be agreed at the time of ordering if the types of coatings described in 6.6.1 b) and c) are to be used. 6.6.3 If a metallic coating is to be applied in accordance with 6.6.1 b), it shall be noted that for delivery conditions C290 to C690, recovery or recrystallization caused by higher temperatures could have an effect on the mechanical properties of the product. 6.7 Weldability All steel grades and delivery conditions shall be suitable for welding using appropriate methods. For delivery conditions C290 to C690, it should be noted that the temperature rises during the welding operation could affect the mechanical properties and the microstructure. 6.8 Dimensions, mass, permissible tolerances 6.8.1 For the dimensions and the tolerances on dimensions and shape, see EN 10140. 6.8.2 A density of 7,85 kg/dm3 shall be assumed for calculating the masses for all types of steel covered by this European Standard. 7 Testing 7.1 Agreement of acceptance testing 7.1.1 If a test is specified by a purchaser, he shall specify at the time of tendering and ordering: — the type of test (specific or non-specific) (see EN 10021); — the type of test document (see EN 10204). 7.1.2 The specific test shall be carried out in conformity with the requirements of 7.2 to 7.5. 7.2 Acceptance units and number of tests 7.2.1 The acceptance unit is 5 t or fraction of 5 t of products of the same steel grade, the same delivery condition and with the same surface characteristics and nominal thickness. Coils weighing more than 5 t shall be regarded as one acceptance unit. All products belonging to one acceptance unit shall be from the same cast. 7.2.2 For each acceptance unit a tensile test shall be carried out and where appropriate a determination of n and r (see Table 1 and Annex A and Annex B). Alternatively if specified at the time of ordering a hardness test shall be carried out. 7.3 Sampling and preparation of test pieces 7.3.1 A sample of adequate size for all the tests to be carried out shall be taken from the products comprising the acceptance unit from any position on the strip or cut length. In cases of dispute, this sample shall be taken from a position at least 3 m from one of the ends of the coil. 7.3.2 The tensile test pieces shall be taken from samples complying with 7.3.1, parallel to the direction in which the product was rolled. The test pieces should not be further worked on either surface. 7.3.3 When cutting the test pieces from the samples, as little deformation as possible shall be caused. If shears or cutting torches are used, an adequate surplus shall be allowed, which will then be further worked (see EURONORM 18). 7.4 Test methods to be followed 7.4.1 All mechanical and technological tests shall be carried out at ambient temperature. 7.4.2 The tensile test shall be carried out in accordance with EN 10002-1. 7.4.3 If agreed separately at the time of ordering, the Vickers hardness test shall be carried out in accordance with EURONORM 5. EN 10139:1997 6 © BSI 02-2000 7.4.4 If agreed separately at the time of ordering, surface roughness shall be determined in accordance with EURONORM 49. 7.4.5 The determination of plastic strain ratio r and tensile hardening component n shall be carried out in accordance with Annex A and Annex B of this standard. 7.5 Re-tests 7.5.1 If the results obtained from a correctly selected sample do not meet the specified requirements, two further samples from the same acceptance unit shall be tested for each unsatisfactory test in accordance with EN 10021 and both these shall meet the specified requirements. 7.5.2 The manufacturer shall be entitled to submit unsatisfactory acceptance units for re-testing after suitable rectification treatment has been carried out. 8 Marking Marking of the products in line with the specifications of EN 10021 may be agreed at the time of ordering. 9 Oiling 9.1 For all delivery conditions, apart from A, the products are usually covered with traces of rolling oil during the finishing process. However, this does not p