1、BRITISH STANDARDBS EN 10277-4:2008Bright steel products Technical delivery conditions Part 4: Case hardening steelsICS 77.140.20; 77.140.60g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g
2、3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 10277-4:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008ISBN 978 0 580 52928 3National forewordThis British Standard is the UK implementation of EN 10277-4:2008. It supers
3、edes BS EN 10277-4:1999 which is withdrawn.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 neces
4、sary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 10277-4March 2008ICS 77.140.2
5、0; 77.140.60 Supersedes EN 10277-4:1999 English VersionBright steel products - Technical delivery conditions - Part 4:Case hardening steelsProduits en acier transforms froid - Conditionstechniques de livraison - Partie 4: Aciers pour cmentationBlankstahlerzeugnisse - Technische Lieferbedingungen -Te
6、il 4: EinsatzsthleThis European Standard was approved by CEN on 4 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bib
7、liographical references concerning such nationalstandards 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 translationunder the responsibility o
8、f 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 Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland
9、, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1
10、050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10277-4:2008: EEN 10277-4:2008 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Classification and designation.4 4.1 Class
11、ification4 4.2 Designation 4 5 Information to be supplied by the purchaser .4 6 Manufacturing process .4 7 Requirements.5 7.1 Chemical composition 5 7.2 Mechanical properties.5 7.3 Hardenability 5 7.4 Grain size5 7.5 Non-metallic inclusions 5 7.6 Options .5 8 Inspection and testing.5 8.1 Types and c
12、ontents of inspection documents .5 8.2 Specific inspection 5 8.3 Verification of hardenability .6 9 Marking .6 BS EN 10277-4:2008EN 10277-4:2008 (E) 3 Foreword This document (EN 10277-4:2008) has been prepared by Technical Committee ECISS/TC 23 “Steels for heat treatment, alloy steels and free-cutti
13、ng 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 withdraw
14、n 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 10277-4:1999. According
15、 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, L
16、ithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. This European Standard EN 10277 Bright steel products - Technical delivery conditions is subdivided as follows: Part 1: General; Part 2: Steels for gene
17、ral 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 prod
18、ucts. 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 (Bauschingers effect), which was not taken into account when drafting the first edition of this
19、 standard. In this second edition the proof strength values of non-alloy and alloy grades in condition +QT+C in parts 3 and 5 have been adjusted downwards compared to the first edition. BS EN 10277-4:2008EN 10277-4:2008 (E) 4 1 Scope This part of EN 10277 applies to bright steel bars in the drawn, t
20、urned or ground condition, in straight lengths of case hardening steels. This EN 10277-4 is complemented by EN 10277-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated
21、references, the latest edition of the referenced document (including any amendments) applies. EN 10084, Case hardening steels - Technical delivery conditions EN 10277-1, Bright steel products - Technical delivery conditions - Part 1: General 3 Terms and definitions For the purposes of this European
22、Standard, the terms and definitions given in EN 10277-1 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 su
23、rface layer and a tough core. 4 Classification and designation 4.1 Classification Steel grades C10R, C15R and C16R are non-alloy special steels. All other steel grades covered by this European Standard are alloy special steels. 4.2 Designation See EN 10277-1. 5 Information to be supplied by the purc
24、haser See EN 10277-1. 6 Manufacturing process See EN 10277-1. BS EN 10277-4:2008EN 10277-4:2008 (E) 5 7 Requirements 7.1 Chemical composition 7.1.1 Cast analysis The chemical composition of the steel according to the cast analysis shall be as specified in Table 1. 7.1.2 Product analysis The permissi
25、ble deviations from the chemical composition as specified in Table 1 for cast analysis and the product analysis of the steel shall be as specified in Table 2. 7.2 Mechanical properties The mechanical properties of the steels shall be as specified in Table 3 and Table 4. 7.3 Hardenability Where steel
26、s are ordered with hardenability requirements, the requirements of EN 10084 shall apply. 7.4 Grain size Unless otherwise agreed, the steel shall show a fine grain structure with an austenitic grain size of 5 or finer. For verification see EN 10277-1, B.2. 7.5 Non-metallic inclusions 7.5.1 Microscopi
27、c 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 10084. 7.5.2 Macroscopic inclusions As freedom from macroscopic inclusions cannot be guaranteed in any steel, any requirem
28、ent to verify the level present shall be agreed at the time of enquiry and order (see EN 10277-1, 7.5.2 and B.3.2). 7.6 Options See Annex B of EN 10277-1. 8 Inspection and testing 8.1 Types and contents of inspection documents See EN 10277-1. 8.2 Specific inspection See EN 10277-1. BS EN 10277-4:200
29、8EN 10277-4:2008 (E) 6 8.3 Verification of hardenability See EN 10084, 8.2.1.1. 9 Marking See EN 10277-1.BS EN 10277-4:2008EN 10277-4:2008 (E) 7 Table 1 Steel grades and chemical composition (cast analysis) Designation Chemical composition, % by massa,b,c Steel name Steel number Steel grade accordin
30、g to C Si max. Mn P max. S Cr Mo Ni B C10R 1.1207 EN 10084 0,07 to 0,13 0,40 0,30 to 0,60 0,035 0,020 to 0,040 - - - - C15R 1.1140 EN 10084 0,12 to 0,18 0,40 0,30 to 0,60 0,035 0,020 to 0,040 - - - - C16R 1.1208 EN 10084 0,12 to 0,18 0,40 0,60 to 0,90 0,035 0,020 to 0,040 - - - - 16MnCrS5 1.7139 EN
31、10084 0,14 to 0,19 0,40 1,00 to 1,30 0,025 0,020 to 0,040 0,80 to 1,10 - - - 16MnCrB5 1.7160 EN 10084 0,14 to 0,19 0,40 1,00 to 1,30 0,025 0,035 0,80 to 1,10 - - 0,0008 to 0,0050d20MnCrS5 1.7149 EN 10084 0,17 to 0,22 0,40 1,10 to 1,40 0,025 0,020 to 0,040 1,00 to 1,30 - - - 16NiCrS4 1.5715 EN 10084
32、0,13 to 0,19 0,40 0,70 to 1,00 0,025 0,020 to 0,040 0,60 to 1,00 - 0,80 to 1,10 - 15NiCr13 1.5752 EN 10084 0,14 to 0,20 0,40 0,40 to 0,70 0,025 0,035 0,60 to 0,90 - 3,00 to 3,50 - 20NiCrMoS2-2 1.6526 EN 10084 0,17 to 0,23 0,40 0,65 to 0,95 0,025 0,020 to 0,040 0,35 to 0,70 0,15 to 0,25 0,40 to 0,70
33、- 17NiCrMoS6-4 1.6569 EN 10084 0,14 to 0,20 0,40 0,60 to 0,90 0,025 0,020 to 0,040 0,80 to 1,10 0,15 to 0,25 1,20 to 1,50 - aElements 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 r
34、easonable 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. bWhere requirements are made on hardenability (see EN 10084), slight deviations from the limits for
35、 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 2. cSteels with improved machinability as a result of the addition of higher sulphur contents up to around 0,1
36、0% S (including resulphurized steels with controlled inclusion content (e.g. Ca-treatment) (modern method) or lead may be supplied on request. In the first case the upper limit for the manganese content may be increased by 0,15 %. dBoron is in this case added not for increase of hardenability but to
37、 improve the toughness of the case hardened zone. BS EN 10277-4:2008EN 10277-4:2008 (E) 8 Table 2 Permissible deviations between the product analysis and the limiting values given in Table 1 for the cast analysis Permissible maximum content in the cast analysis Permissible deviationa Element % by ma
38、ss % by mass C 0,23 0,02 Si 0,40 + 0,03 1,00 0,04 Mn 1,00 1,40 0,05 P 0,035 + 0,005 S 0,040 + 0,005b Cr 1,30 0,05 Mo 0,25 0,03 2,00 0,05 Ni 2,00 3,50 0,07 B 0,005 0 0,000 5 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
39、1, but not both at the same time. bFor steels with a specified sulphur range (0,020 % to 0,040 % according to cast analysis), the permissible deviation is 0,005 %.BS EN 10277-4:2008EN 10277-4:2008 (E) 9 Table 3 Mechanical properties of non alloy steels Designation Mechanical propertiesa As rolled +
40、turned (+SH) Cold drawn (+C) +Ac + turned(+A +SH) +Ac + cold drawn(+A +C) Steel name Steel number Thicknessa mm Hardness HBW Rm MPa Rp 0,2b MPamin. Rm bMPa A% min. Hardness HBW max. Hardnessd HBW max. 5 10 - - 350 460 to 760 8 - 225 10 16 - - 300 430 to 730 9 - 216 16 40 92 to 163 310 to 550 250 400
41、 to 700 10 131 207 40 63 92 to 163 310 to 550 200 350 to 640 12 131 190 C10R 1.1207 63 100 92 to 163 310 to 550 180 320 to 580 12 131 172 5 10 - - 380 500 to 800 7 - 238 10 16 - - 340 480 to 780 8 - 231 16 40 98 to 178 330 to 600 280 430 to 730 9 143 216 40 63 98 to 178 330 to 600 240 380 to 670 11
42、143 198 C15R 1.1140 63 100 98 to 178 330 to 600 215 340 to 600 12 143 178 5 10 - - 400 520 to 820 7 - 242 10 16 - - 360 500 to 800 8 - 238 16 40 105 to 184 350 to 620 300 450 to 750 9 156 222 40 63 105 to 184 350 to 620 260 400 to 690 11 156 204 C16R 1.1208 63 100 105 to 184 350 to 620 235 360 to 62
43、0 12 156 184 aFor thicknesses 10 16 - 250 - - 16 40 207 245 140 to 187 140 to 240 40 63 207 240 140 to 187 140 to 235 16MnCrS5 1.7139 63 100 207 240 140 to 187 140 to 235 5 10 - 260 - - 10 16 - 250 - - 16 40 207 245 140 to 187 140 to 240 40 63 207 240 140 to 187 140 to 235 16MnCrB5 1.7160 63 100 207
44、 240 140 to 187 140 to 235 5 10 - 270 - - 10 16 - 260 - - 16 40 217 255 152 to 201 152 to 250 40 63 217 250 152 to 201 152 to 245 20MnCrS5 1.7149 63 100 217 250 152 to 201 152 to 245 5 10 - 270 - - 10 16 - 260 - - 16 40 217 255 156 to 207 156 to 245 40 63 217 255 156 to 207 156 to 240 16NiCrS4 1.571
45、5 63 100 217 255 156 to 207 156 to 240 5 10 - - - - 10 16 - - - - 16 40 255 - 166 to 217 - 40 63 255 - 166 to 217 - 15NiCr13 1.5752 63 100 255 - 166 to 217 - 5 10 - 270 - - 10 16 - 260 - - 16 40 212 255 149 to 194 149 to 240 40 63 212 255 149 to 194 149 to 235 20NiCrMoS2-2 1.6526 63 100 212 255 149
46、to 194 149 to 235 5 10 - 275 - - 10 16 - 265 - - 16 40 229 260 149 to 201 149 to 250 40 63 229 255 149 to 201 149 to 245 17NiCrMoS6-4 1.6569 63 100 229 255 149 to 201 149 to 245 aFor thicknesses 5 mm the mechanical properties may be agreed at the time of enquiry and order. b+A= soft annealed. c+FP=
47、treated to ferrite-pearlite structure and hardness range. dThe hardness values for flats may deviate by 10 %. BS EN 10277-4:2008blankBS EN 10277-4:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standard
48、s. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter.RevisionsBritish 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 ai
49、m 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
