BS EN 10084-2008 en 3851 Case hardening steels - Technical delivery conditions《表面硬化钢 技术交付条件》.pdf

1、BRITISH STANDARDBS EN 10084:2008Case hardening steels Technical delivery conditionsICS 77.140.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS E

2、N 10084:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2008 BSI 2008ISBN 978 0 580 56375 1National forewordThis British Standard is the UK implementation of EN 10084:2008. It supersedes BS EN 10084:1998 which is withdrawn.The UK

3、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 responsibl

4、e for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 10084April 2008ICS 77.140.10 Supersedes EN 10084:1998 English VersionCase harden

5、ing steels - Technical delivery conditionsAciers pour cmentation - Conditions techniques delivraisonEinsatzsthle - Technische LieferbedingungenThis European Standard was approved by CEN on 29 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the

6、conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in th

7、ree official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Au

8、stria, 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 COMMI

9、TTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10084:2008: EEN 10084:2008 (E) 2 Contents

10、 Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .5 4 Classification and designation.5 4.1 Classification5 4.2 Designation 6 5 Information to be supplied by the purchaser .6 5.1 Mandatory information6 5.2 Options .6 6 Manufacturing process .7 6.1 Melting process7 6.2 Deoxid

11、ation 7 6.3 Manufacture of the product 7 6.4 Heat-treatment condition and surface finish at the time of delivery7 6.5 Cast separation8 7 Requirements.8 7.1 Chemical composition, hardness and hardenability .8 7.2 Technological properties 8 7.3 Structure .8 7.4 Internal soundness9 7.5 Surface conditio

12、n.9 7.6 Dimensions, tolerances on dimensions and shape.9 8 Inspection and testing.9 8.1 Types and contents of inspection documents .9 8.2 Specific inspection and testing10 9 Marking .10 Annex A (normative) Options .31 Annex B (informative) Dimensional standards applicable to products complying with

13、this European Standard33 Annex C (normative) Determining the microscopic non-metallic inclusions content .34 Annex D (informative) Comparison of steel grades specified in this European Standard and ISO 683-11:1987 and other steel grades previously standardized nationally.35 Annex E (informative) Cla

14、ssification of steel grades according to minimum tensile strength as a function of diameter after hardening and tempering at 200 C.36 Bibliography 37 BS EN 10084:2008EN 10084:2008 (E) 3 Foreword This document (EN 10084:2008) has been prepared by Technical Committee ECISS/TC 23 “Steels for heat treat

15、ment, 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 October 2008, and conflicting natio

16、nal standards shall be withdrawn at the latest by October 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 supersed

17、es EN 10084:1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Repub-lic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Icelan

18、d, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 10084:2008EN 10084:2008 (E) 4 1 Scope 1.1 This European Standard gives the technical delivery requirements for: semi-f

19、inished products, hot formed, for example blooms, billets, slabs (see NOTE 2 and NOTE 3), bars (see NOTE 2), rod, wide flats, quarto plates, hot-rolled sheet/plate and strip, hammer and drop forgings (see NOTE 2), manufactured from the case hardening non alloyed or alloyed steels (see NOTE 4) listed

20、 in Table 3 and sup-plied in one of the heat treatment conditions given for the different types of products in Table 1, lines 2 to 7 and in one of the surface conditions given in Table 2. The steels are in general intended for the fabrication of case-hardened (see Clause 3) machine parts. NOTE 1 Eur

21、opean Standards relating to steels complying with the requirements for the chemical composition in Ta-ble 3 but which are supplied in other product forms or treatment conditions than given above or are intended for special applications, and European Standards for similar steel grades are listed in t

22、he Bibliography. NOTE 2 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless rolled rings and hammer-forged bars are included under semi-finished products or bars and not under the term “hammer and drop forgings“. NOTE 3 Special agreements shall be made when ordering non-def

23、ormed continuously cast semi-finished products. NOTE 4 In accordance with EN 10020, the steels covered by this European Standard are special steels. 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 enqui

24、ry and order (see Annex A). 1.3 In addition to the specifications of this European Standard, the general technical delivery requirements of EN 10021 are applicable, unless otherwise specified. 2 Normative references The following referenced documents are indispensable for the application of this doc

25、ument. For dated refer-ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10020, Definition and classification of grades of steel EN 10021, General technical delivery conditions for steel products EN 100

26、27-1, Designation systems for steels - Part 1: Steel names EN 10027-2, Designation systems for steel - Part 2: Numerical system EN 10052, Vocabulary of heat treatment terms for ferrous products EN 10079, Definition of steel products BS EN 10084:2008EN 10084:2008 (E) 5 EN 10160, Ultrasonic testing of

27、 steel flat product of thickness equal to or greater than 6 mm (reflection method) EN 10163-2, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections - Part 2: Plates and wide flats EN 10204, Metallic products - Types of inspection documents EN 10221, Surface

28、 quality classes for hot-rolled bars and rods - Technical delivery conditions EN 10247:2007, Micrographic examination of the non-metallic inclusion content of steels using standard pictures prCEN/TR 10261, Iron and steel - Review of available methods of chemical analysis EN 10308, Non destructive te

29、sting Ultrasonic testing of steel bars EN ISO 377, Steel and steel products - Location and preparation of samples and test pieces for mechanical testing (ISO 377:1997) EN ISO 642, Steel - Hardenability test by end quenching (Jominy test) (ISO 642:1999) EN ISO 643, Steels Micrographic determination o

30、f the apparent grain size (ISO 643:2003) EN ISO 6506-1, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:2005) EN ISO 6508-1, Metallic materials - Rockwell hardness test - Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1:2005) EN ISO 14284, Steel a

31、nd iron - Sampling and preparation of samples for the determination of chemical com-position (ISO 14284:1996) 3 Terms and definitions For the purposes of this European Standard the terms and definitions given in EN 10020, EN 10021, EN 10052, EN 10079, EN ISO 377 and EN ISO 14284 and the following ap

32、ply. 3.1 case-hardening steels steels with a relatively low carbon content which are intended for carburising or carbonitriding and subsequent hardening NOTE Such steels, after treatment, are characterised by a high hardness surface layer and a tough core. 4 Classification and designation 4.1 Classi

33、fication All steels covered by this European Standard are classified according to EN 10020. Steel grades C10E, C10R, C15E, C15R, C16E and C16R are non alloy special steels. All other steels covered by this European Stan-dard are alloy special steels. BS EN 10084:2008EN 10084:2008 (E) 6 4.2 Designati

34、on 4.2.1 Steel names For the steel grades covered by this European Standard, the steel names as given in Table 3, Table 5 and Table 6 are allocated in accordance with EN 10027-1. 4.2.2 Steel numbers For the steel grades covered by this European Standard, the steel numbers as given in Table 3, Table

35、5 and Table 6 are allocated in accordance with EN 10027-2. 5 Information to be supplied by the purchaser 5.1 Mandatory information The following information shall be supplied by the purchaser at the time of enquiry and order: a) quantity to be delivered; b) designation of the product form (e.g. roun

36、d bar or square bar); c) number of the dimensional standard (see 7.6 and Annex B); d) dimensions and tolerances on dimensions and shape and, if applicable, letters denoting relevant special tolerances; e) number of this European Standard (EN 10084); f) steel name or steel number (see 4.2); g) standa

37、rd designation for a test report 2.2 or, if required, any other type of inspection document in accor-dance with EN 10204 (see 8.1). 5.2 Options A number of options are specified in this European Standard and listed below. If the purchaser does not indi-cate his wish to implement one of these options

38、, the supplier shall supply in accordance with the basis specifi-cation of this European Standard (see 5.1) any: a) particular heat-treatment condition at delivery (see 6.4.2 and Table 1); b) particular surface condition at delivery (see 6.4.3 and Table 2); c) requirement concerning minimum reductio

39、n ratio or minimum thickness deformation ratio of rolled and forged products (see 6.3 and A.5); d) verification of fine grain size (see 7.3.1, 8.2.3 and A.4); e) requirement for the verification of non-metallic inclusion content (see 7.3.2, A.1 and Annex C); f) requirement for restricted hardenabili

40、ty scatter bands for alloy steels (+HH, +HL-grades, see 7.1.2 and Table 6); g) verification of hardenability and if agreed the information about calculation of the hardenability (see 8.2.2); BS EN 10084:2008EN 10084:2008 (E) 7 h) requirement for internal soundness (see 7.4 and A.2); i) requirement r

41、elating to surface quality (see 7.5.3); j) requirement concerning suitability of bars and rod for bright drawing (see 7.5.4); k) requirement relating to removal of surface defects (see 7.5.5); l) requirement concerning special marking of the products (see clause 9 and A.6); m) verification of the pr

42、oduct analysis (see A.3). EXAMPLE 20 round bars with nominal diameter 40 mm and the nominal length of 8 000 mm according to EN 10060 made of steel grade 20MnCr5 (1.7147) according to EN 10084 in the heat treatment condition +A with surface condition +BC, test report 2.2 as specified in EN 10204 20 r

43、ound bars EN 10060 - 40x8000 EN 10084 - 20MnCr5+A+BC EN 10204 -2.2 or 20 round bars EN 10060 - 40x8000 EN 10084 - 1.7147+A+BC EN 10204 - 2.2 6 Manufacturing process 6.1 Melting process The type of melting process shall be left to the discretion of the manufacturer. 6.2 Deoxidation All steels shall b

44、e killed. 6.3 Manufacture of the product The manufacturing process route of the product shall be at the manufacturers discretion. For minimum reduction ratio or minimum thickness deformation ratio of rolled and forged products see A.5. 6.4 Heat-treatment condition and surface finish at the time of d

45、elivery 6.4.1 Normal condition at delivery Unless otherwise agreed at the time of enquiry and order, the products shall be delivered in the untreated, i.e. hot formed, condition. 6.4.2 Particular heat-treatment condition If so agreed at the time of enquiry and order, the products shall be delivered

46、in one of the heat-treatment con-ditions given in Table 1, line 3 to line 8. BS EN 10084:2008EN 10084:2008 (E) 8 6.4.3 Particular surface condition If so agreed at the time of enquiry and order, the products shall be supplied in one of the special surface con-ditions given in Table 2, line 3 to line

47、 7. 6.5 Cast separation The products shall be delivered as separated by cast. 7 Requirements 7.1 Chemical composition, hardness and hardenability 7.1.1 Table 1 gives a survey on combinations of usual heat-treatment conditions at delivery, product forms and requirements according to Table 3 to Table

48、7 (chemical composition, hardenability, maximum hardness, hardness range). 7.1.2 Unless otherwise agreed for alloy steels the hardenability requirements given in Table 5 apply. If agreed at the time of enquiry and order alloy steels with restricted hardenability scatter bands given in Table 6 shall

49、be supplied. 7.2 Technological properties 7.2.1 Machinability All steels are machinable in the conditions “soft annealed”, “treated to hardness range”, “treated to fer-rite/pearlite structure and hardness range” and “normalized“. Where improved machinability is required, the grades with a specified sulphur range should be ordered. (See also Table 3, footnote c). 7.2.2 Shearability of semi-finished products and bars 7.2.2.1 Under suitable shearing conditions (preheating, application of blades with a profile adapted to that of the product, etc.) all steels are