BRITISH STANDARD BS EN 10277 4 2008 Bright steel products — Technical delivery conditions — Part 4 Case hardening steels ICS 77 140 20; 77 140 60 ?? ? ??????? ? ??????? ? ??? ? ?????????? ? ?????? ? ?[.]
BS EN 10277-4:2008 BRITISH STANDARD Bright steel products — Technical delivery conditions — Part 4: Case hardening steels ICS 77 40 20; 77 40 60 ?? ? ? ????? ??????? ??? ?? ???????? ? ?? ? ?? ?? ?? ?????? ? ?? ? ? ?????? ? ??? ? ? ? ? ? ? ? ? ? ? BS EN 10277-4:2008 National foreword This British Standard is the UK implementation of EN 0277-4: 2008 It supersedes BS EN 0277-4: 999 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee ISE/31 , Wrought steels A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 © BSI 2008 ISBN 978 580 52928 Amendments/corrigenda issued since publication Date Comments EN 0277-4 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM March 2008 ICS 77.1 40.20; 77.1 40.60 Supersedes EN 0277-4:1 999 English Version Bright steel products - Technical delivery conditions - Part 4: Case hardening steels Produits en acier transformés froid - Conditions techniques de livraison - Partie 4: Aciers pour cémentation Blankstahlerzeugnisse - Technische Lieferbedingungen Teil 4: Einsatzstähle This European Standard was approved by CEN on February 2008 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 CEN Management Centre 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 CEN Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION C OMITÉ EURO PÉEN DE NO RMALIS ATIO N EUROPÄIS CHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1 050 Brussels © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 0277-4:2008: E BS EN 10277-4:2008 EN 0277-4:2008 (E) Contents Page Foreword Scope Normative references Terms and definitions 4 Classification and designation .4 4.1 Classification 4.2 Designation Information to be supplied by the purchaser .4 Manufacturing process Requirements 7.1 Chemical composition 7.2 Mechanical properties 7.3 Hardenability 7.4 Grain size 7.5 Non-metallic inclusions 7.6 Options Inspection and testing 8.1 Types and contents of inspection documents 8.2 Specific inspection 8.3 Verification of hardenability Marking BS EN 10277-4:2008 EN 0277-4:2008 (E) Foreword This document (EN 0277-4:2008) has been prepared by Technical Committee ECISS/TC 23 “Steels for heat treatment, alloy steels and free-cutting steels - Qualities and dimensions”, the secretariat of which is held by DIN 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 September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights This document supersedes EN 0277-4:1 999 According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom This European Standard EN 0277 'Bright steel products - Technical delivery conditions' is subdivided as follows: Part : General; Part 2: Steels for general engineering purposes; Part 3: Free-cutting steels; Part 4: Case hardening steels; Part 5: Steels for quenching and tempering During the preparation of the first edition of this European Standard there were not enough statistical data available concerning mechanical properties of bright bar products Since then it has been recognized that the proof strength values in the cold drawn condition were too high In addition, cyclic stresses that occur during straightening can reduce the proof strength (Bauschinger's effect), which was not taken into account when drafting the first edition of this standard In this second edition the proof strength values of non-alloy and alloy grades in condition +QT+C in parts and have been adjusted downwards compared to the first edition BS EN 10277-4:2008 EN 0277-4:2008 (E) Scope This part of EN 0277 applies to bright steel bars in the drawn, turned or ground condition, in straight lengths of case hardening steels This EN 0277-4 is complemented by EN 0277-1 Normative references The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 0084, Case hardening steels - Technical delivery conditions EN 0277-1 , Bright steel products - Technical delivery conditions - Part 1: General Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 0277-1 and the following apply 3.1 case hardening steels steels with a relatively low carbon content, which are intended for carburising or carbonitriding and subsequent hardening Such steels, after treatment, are characterised by a high hardness surface layer and a tough core Classification and designation 4.1 Classification Steel grades C1 0R, C1 5R and C1 6R are non-alloy special steels All other steel grades covered by this European Standard are alloy special steels 4.2 Designation See EN 0277-1 Information to be supplied by the purchaser See EN 0277-1 Manufacturing process See EN 0277-1 BS EN 10277-4:2008 EN 0277-4:2008 (E) Requirements 7.1 Chemical composition 7.1 Cast analysis The chemical composition of the steel according to the cast analysis shall be as specified in Table 7.1 Product analysis The permissible deviations from the chemical composition as specified in Table for cast analysis and the product analysis of the steel shall be as specified in Table 7.2 Mechanical properties The mechanical properties of the steels shall be as specified in Table and Table 7.3 Hardenability Where steels are ordered with hardenability requirements, the requirements of EN 0084 shall apply 7.4 Grain size Unless otherwise agreed, the steel shall show a fine grain structure with an austenitic grain size of or finer For verification see EN 0277-1 , B.2 7.5 Non-metallic inclusions 7.5.1 Microscopic inclusions The steels shall have a degree of cleanness corresponding to the special steel quality For details of requirements and verification see Annex A.1 and Annex C of EN 0084 7.5.2 Macroscopic inclusions As freedom from macroscopic inclusions cannot be guaranteed in any steel, any requirement to verify the level present shall be agreed at the time of enquiry and order (see EN 0277-1 , 7.5.2 and B.3.2) 7.6 Options See Annex B of EN 0277-1 Inspection and testing 8.1 Types and contents of inspection documents See EN 0277-1 8.2 Specific inspection See EN 0277-1 BS EN 10277-4:2008 EN 0277-4:2008 (E) 8.3 Verification of hardenability See EN 0084, 8.2.1 Marking See EN 0277-1 6526 6569 20NiCrMoS2-2 7NiCrMoS6-4 EN 0084 EN 0084 EN 0084 0,1 to 0,20 0,1 to 0,23 0,1 to 0,20 0,1 to 0,1 0,40 0,40 0,40 0,40 0,40 0,60 to 0,90 0,65 to 0,95 0,40 to 0,70 0,70 to ,00 ,1 to ,40 ,00 to ,30 0,025 0,025 0,025 0,025 0,025 0,025 0,025 0,035 0,035 0,020 to 0,040 0,020 to 0,040 ≤ 0,020 to 0,040 0,020 to 0,040 ≤ 0,020 to 0,040 0,020 to 0,040 0,80 to ,1 0,35 to 0,70 0,60 to 0,90 0,60 to ,00 ,00 to ,30 0,80 to ,1 0,80 to ,1 - - - - 0,1 to 0,25 0,1 to 0,25 - - ,20 to ,50 0,40 to 0,70 3,00 to 3,50 0,80 to ,1 - - - - - - - Ni - - - Mo - - - - - 0,0008 to 0,0050 d - - - - B Boron is in this case added not for increase of hardenability but to improve the toughness of the case hardened zone 5752 5NiCr1 EN 0084 0,1 to 0,22 0,40 ,00 to ,30 0,035 0,020 to 0,040 - Cr d 571 6NiCrS4 EN 0084 0,1 to 0,1 0,40 0,60 to 0,90 0,035 0,020 to 0,040 S Steels with improved machinability as a result of the addition of higher sulphur contents up to around 0,1 0% S (including resulphurized steels with controlled inclusion content (e.g Catreatment)) (modern method) or lead may be supplied on request In the first case the upper limit for the manganese content may be increased by 0,1 % 71 49 20MnCrS5 EN 0084 0,1 to 0,1 0,40 0,30 to 0,60 0,035 max P c 71 60 6MnCrB5 EN 0084 0,1 to 0,1 0,40 0,30 to 0,60 Mn Where requirements are made on hardenability (see EN 0084), slight deviations from the limits for the cast analysis are permitted, except for phosphorus and sulphur; these deviations shall, however, not exceed in the case of carbon ± 0,01 % and in all other cases the values acc to Table 71 39 6MnCrS5 EN 0084 0,1 to 0,1 0,40 max Si b 1 208 C1 6R EN 0084 0,07 to 0,1 C Chemical composition, % by massa,b,c Elements not quoted in this Table shall not be intentionally added to the steel without the agreement of the purchaser, other than for the purpose of finishing the heat All reasonable precautions shall be taken to prevent the addition of such elements from scrap or other material used in manufacture, which affect the hardenability, mechanical properties and applicability 1 40 C1 5R EN 0084 Steel grade according to a 1 207 Steel number C1 0R Steel name Designation Table — Steel grades and chemical composition (cast analysis) EN 0277-4:2008 (E) BS EN 10277-4:2008 BS EN 10277-4:2008 EN 0277-4:2008 (E) Table — Permissible deviations between the product analysis and the limiting values given in Table for the cast analysis Element Permissible deviation a % by mass % by mass C ≤ 0,23 ± 0,02 Si ≤ 0,40 + 0,03 ≤ ,00 ± 0,04 Mn > ,00 ≤ ,40 ± 0,05 P ≤ 0,035 + 0,005 S ≤ 0,040 + 0,005 b Cr ≤ ,30 ± 0,05 Mo ≤ 0,25 ± 0,03 ≤ 2,00 ± 0,05 Ni B Permissible maximum content in the cast analysis > 2,00 ≤ 3,50 ≤ 0,005 ± 0,07 ± 0,000 a ± means that in one cast the deviation may occur over the upper value or under the lower value of the specified range in Table , but not both at the same time b For steels with a specified sulphur range (0,020 % to 0,040 % according to cast analysis), the permissible deviation is ±0,005 % - ≤ 10 > 10 ≤ 16 98 to 78 98 to 78 - > 40 ≤ 63 > 63 ≤ 00 ≤ 10 > 10 ≤ 16 235 360 to 620 400 to 690 The hardness values for flats may deviate by ±1 % 350 to 620 260 450 to 750 500 to 800 520 to 820 340 to 600 380 to 670 430 to 730 d 05 to 84 > 63 ≤ 00 350 to 620 300 360 400 21 240 280 480 to 780 500 to 800 320 to 580 +A = soft annealed 05 to 84 > 40 ≤ 63 350 to 620 - - 330 to 600 330 to 600 330 to 600 340 380 80 350 to 640 400 to 700 430 to 730 460 to 760 c 05 to 84 > ≤ 40 ≥ 98 to 78 > ≤ 40 - - 31 to 550 200 250 300 350 Rm b MPa For flats and special sections the yield strength ( Rp0,2) may deviate by -1 % and the tensile strength (Rm ) by ±1 % 1 208 C1 6R 92 to 63 > 63 ≤ 00 31 to 550 31 to 550 - - MPa Rp 0,2b For thicknesses < mm the mechanical properties may be agreed at the time of enquiry and order 1 40 C1 5R 92 to 63 > 40 ≤ 63 ≥ 92 to 63 - > 10 ≤ 16 > ≤ 40 - ≤ 10 Rm MPa Cold drawn (+C) Mechanical properties a b 1 207 C1 0R Hardness HBW As rolled + turned (+SH) mm ≥ Thickness a a Steel number Steel name Designation Table — Mechanical properties of non alloy steels 12 11 12 11 12 12 10 A % 56 56 56 - - 43 43 43 - - 31 31 31 - - Hardness HBW max +Ac + turned (+A +SH) 84 204 222 238 242 78 98 21 231 238 72 90 207 21 225 Hardness d HBW max +Ac + cold drawn(+A +C) EN 0277-4:2008 (E) BS EN 10277-4:2008 BS EN 10277-4:2008 EN 0277-4:2008 (E) Table — Mechanical properties of alloy steels Thickness a Designation Steel name Mechanical properties a +Ab + turned (+A +SH) +Ab + cold drawn (+A +C) +FP c + turned (+FP +SH) +FP c + cold drawn (+FP +C) mm Hardness HBW max Hardness d HBW max Hardness HBW Hardness d HBW ≤ 10 > 10 ≤ 16 > ≤ 40 > 40 ≤ 63 > 63 ≤ 00 ≥ ≤ 10 > 10 ≤ 16 > ≤ 40 > 40 ≤ 63 > 63 ≤ 00 ≥ ≤ 10 > 10 ≤ 16 > ≤ 40 > 40 ≤ 63 > 63 ≤ 00 ≥ ≤ 10 > 10 ≤ 16 > ≤ 40 > 40 ≤ 63 > 63 ≤ 00 ≥ ≤ 10 > 10 ≤ 16 > ≤ 40 > 40 ≤ 63 > 63 ≤ 00 ≥ ≤ 10 > 10 ≤ 16 > ≤ 40 > 40 ≤ 63 > 63 ≤ 00 ≥ ≤ 10 > 10 ≤ 16 > ≤ 40 > 40 ≤ 63 > 63 ≤ 00 207 207 207 207 207 207 21 21 21 21 21 21 255 255 255 21 21 21 229 229 229 260 250 245 240 240 260 250 245 240 240 270 260 255 250 250 270 260 255 255 255 270 260 255 255 255 275 265 260 255 255 40 to 87 40 to 87 40 to 87 40 to 87 40 to 87 40 to 87 52 to 201 52 to 201 52 to 201 56 to 207 56 to 207 56 to 207 66 to 21 66 to 21 66 to 21 49 to 94 49 to 94 49 to 94 49 to 201 49 to 201 49 to 201 40 to 240 40 to 235 40 to 235 40 to 240 40 to 235 40 to 235 52 to 250 52 to 245 52 to 245 56 to 245 56 to 240 56 to 240 49 to 240 49 to 235 49 to 235 49 to 250 49 to 245 49 to 245 Steel number ≥ 6MnCrS5 71 39 6MnCrB5 71 60 20MnCrS5 71 49 6NiCrS4 571 5NiCr1 5752 20NiCrMoS2-2 6526 7NiCrMoS6-4 6569 a For thicknesses < mm the mechanical properties may be agreed at the time of enquiry and order b +A= soft annealed c +FP= treated to ferrite-pearlite structure and hardness range d The hardness values for flats may deviate by ±1 % 10 blank BS EN 10277-4:2008 BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: +44 (0)20 8996 9000 Fax: +44 (0)20 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: +44 (0)20 8996 9001 Fax: +44 (0)20 8996 7001 Email: orders@bsi- global com Standards are also available from the BSI website at http: //www bsi-global com In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: +44 (0)20 8996 71 1 Fax: +44 (0)20 8996 7048 Email: info@bsi-global com Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: +44 (0)20 8996 7002 Fax: +44 (0)20 8996 7001 Email: membership@bsi-global com Information regarding online access to British Standards via British Standards Online can be found at http: //www bsi- global com/bsonline Further information about BSI is available on the BSI website at http: //www bsi-global com Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means – electronic, photocopying, recording or otherwise – without prior written permission from BSI BSI 389 Chiswick High Road London W4 4AL This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained Details and advice can be obtained from the Copyright & Licensing Manager Tel: +44 (0)20 8996 7070 Fax: +44 (0)20 8996 7553 Email: copyright@bsi-global com