SIST EN 10083-2:2006

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EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10083-2August 2006ICS 77.140.10Supersedes EN 10083-2:1991
English VersionSteels for quenching and tempering - Part 2: Technical deliveryconditions for non alloy steelsAciers pour trempe et revenu - Partie 2: Conditionstechniques de livraison des aciers non alliésVergütungsstähle - Teil 2: Technische Lieferbedingungenfür unlegierte StähleThis European Standard was approved by CEN on 30 June 2006.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 bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10083-2:2006: E



EN 10083-2:2006 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.5 4 Classification and designation.5 4.1 Classification.5 4.2 Designation.5 5 Information to be supplied by the purchaser.6 5.1 Mandatory information.6 5.2 Options.6 6 Manufacturing process.7 6.1 General.7 6.2 Deoxidation.7 6.3 Heat treatment and surface condition at delivery.7 6.4 Cast separation.7 7 Requirements.7 7.1 Chemical composition, hardenability and mechanical properties.7 7.2 Machinability.8 7.3 Shearability of semi-finished products and bars.8 7.4 Structure.8 7.5 Internal soundness.9 7.6 Surface quality.9 7.7 Dimensions, tolerances on dimensions and shape.9 8 Inspection.10 8.1 Testing procedures and types of documents.10 8.2 Frequency of testing.10 8.3 Tests to be carried out for specific inspection.10 9 Preparation of samples and test pieces.10 9.1 Selection and preparation of samples for chemical analysis.10 9.2 Location and orientation of samples and test pieces for mechanical tests.10 9.3 Location and preparation of samples for hardness and hardenability tests.11 9.4 Identification of samples and test pieces.11 10 Test methods.11 10.1 Chemical analysis.11 10.2 Mechanical tests.11 10.3 Hardness and hardenability tests.11 10.4 Retests.11 11 Marking, labelling, packaging.11 Annex A (normative)
Options.34 Annex B (informative)
Comparison of steel grades specified in this European Standard and ISO 683-1:1987 and other steel grades previously standardized nationally.36 Bibliography.37



EN 10083-2:2006 (E) 3 Foreword This document (EN 10083-2:2006) 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 February 2007, and conflicting national standards shall be withdrawn at the latest by February 2007. This document supersedes EN 10083-2:1991. Together with Part 1 and Part 3 of this standard, this Part 2 is a revision of the following European Standards:
EN 10083-1:1991 +A1:1996, Quenched and tempered steels – Part 1: Technical delivery conditions for special steels EN 10083-2: 1991 +A1:1996, Quenched and tempered steels – Part 2: Technical delivery conditions for unalloyed quality steels
EN 10083-3:1995, Quenched and tempered steels – Part 3: Technical delivery conditions for boron steels and of EURONORM 86-70, Flame and induction hardening steels – Quality specifications According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, 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.



EN 10083-2:2006 (E) 4 1 Scope This part of EN 10083, in addition to Part 1, specifies the technical delivery requirements for:  semi-finished products, hot formed, e.g. blooms, billets, slabs (see NOTES 2 and 3 in EN 10083-1:2006, Clause 1),  bars (see NOTE 2 in EN 10083-1:2006, Clause 1),  rod,  wide flats,  hot-rolled strip and sheet/plate,  forgings (see NOTE 2 in EN 10083-1:2006, Clause 1), manufactured from the direct hardening non alloy steels for quenching and tempering and the non alloy flame and induction hardening steels and supplied 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 generally intended for the manufacture of quenched and tempered, flame or induction hardened machine parts, but can also be used in the normalized condition. The requirements for mechanical properties given in this document are restricted to the sizes given in Table 9 and Table 10. NOTE
This document does not apply for bright steel products. For bright steel products EN 10277-1 and EN 10277-5 apply. In special cases, variations in these technical delivery requirements or additions to them may be agreed at the time of enquiry and order (see Annex A). 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 references, the latest edition of the referenced document (including any amendments) applies. EN 10002-1, Metallic materials – Tensile testing – Part 1: Method of test at ambient temperature
EN 10020, Definition and classification of grades of steel EN 10027-1, Designation systems for steels – Part 1: Steel names EN 10027-2, Designation systems for steel – Part 2: Numerical system EN 10045-1, Metallic materials – Charpy impact test – Part 1: Test method EN 10083-1:2006, Steels for quenching and tempering – Part 1: General technical delivery conditions EN 10160, Ultrasonic testing of steel flat product of thickness equal 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: Plate and wide flats



EN 10083-2:2006 (E) 5 EN 10204, Metallic products – Types of inspection documents EN 10221, Surface quality classes for hot-rolled bars and rods – Technical delivery conditions CR 10261, ECISS Information Circular 11 – Iron and steel – Review of available methods of chemical analysis EN 10308, Non destructive testing – 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 of the apparent grain size (ISO 643:2003) EN ISO 3887, Steels – Determination of depth of decarburization (ISO 3887:2003) EN ISO 6506-1, Metallic materials – Brinell hardness test – Part 1: Test method (ISO 6506-1:2005) EN ISO 6508-1:2005, 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 and iron – Sampling and preparation of samples for the determination of chemical composition (ISO 14284:1996) EN ISO 18265, Metallic materials – Conversion of hardness values (ISO 18265:2003) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 10083-1:2006 apply. 4 Classification and designation 4.1 Classification Steel grades C35, C40, C45, C55 and C60 are classified according to EN 10020 as non alloy quality steels and the other steel grades as non alloy special steels. 4.2 Designation 4.2.1 Steel names For the steel grades covered by this document, the steel names as given in the relevant tables are allocated in accordance with EN 10027-1. 4.2.2 Steel numbers For the steel grades covered by this document, the steel numbers as given in the relevant tables are allocated in accordance with EN 10027-2.



EN 10083-2:2006 (E) 6 5 Information to be supplied by the purchaser 5.1 Mandatory information See EN 10083-1:2006, 5.1. 5.2 Options A number of options are specified in this document (listed below). If the purchaser does not indicate his wish to implement any of these options, the supplier shall act in accordance with the basic specification. a) any particular heat treatment condition (see 6.3.2); b) any particular surface condition (see 6.3.3); c) any verification of the product analysis (see 7.1.2.2 and A.6); d) any requirement to the hardenability (+H, +HH, +HL) for special steels (see 7.1.3) and if agreed the information concerning calculating hardenability (see 10.3.2); e) any verification of mechanical properties of reference test pieces in the quenched and tempered (+QT) or normalized (+N) condition (see A.1 and A.2); f) any fine grain requirements (see 7.4 and A.3); g) any requirements for the verification of non-metallic inclusion content of special steels (see 7.4 and A.4); h) any requirement for internal soundness (see 7.5 and A.5); i) any requirement relating to surface quality (see 7.6.3); j) any requirement regarding the permissible depth of decarburization of special steels (see 7.6.4); k) suitability of bars and rod for bright drawing (see 7.6.5); l) any requirement relating to removal of surface defects (see 7.6.6); m) inspection of surface condition and dimensions shall be carried out by the purchaser at the manufacturer's works (see 8.1.4); n) any requirement concerning special marking of the products (see Clause 11 and A.7). EXAMPLE 20 round bars with the nominal diameter 20 mm and the nominal length of 8000 mm according to EN 10060 made of steel grade C45E (1.1191), according to EN 10083-2 in the heat treatment condition +A, inspection certificate 3.1 as specified in EN 10204. 20 round bars EN 10060 - 20x8000 EN 10083-2 – C45E+A EN 10204 - 3.1 or 20 round bars EN 10060 - 20x8000 EN 10083-2 – 1.1191+A EN 10204 - 3.1



EN 10083-2:2006 (E) 7 6 Manufacturing process 6.1 General The manufacturing process of the steel and of the products is left to the discretion of the manufacturer with the restrictions given by the requirements in 6.2 to 6.4. 6.2 Deoxidation All steels shall be killed. 6.3 Heat treatment and surface condition at delivery 6.3.1 Untreated condition Unless otherwise agreed at the time of enquiry and order, the products shall be delivered in the untreated, i.e. hot worked, condition. NOTE Depending on product shape and dimensions, not all steel grades can be delivered in the hot worked untreated condition (e. g. steel grade C60). 6.3.2 Particular heat treatment condition If so agreed at the time of enquiry and order, the products shall be delivered in one of the heat-treatment conditions given in Table 1, lines 3 to 7. 6.3.3 Particular surface condition If so agreed at the time of enquiry and order, the products shall be delivered with one of the particular surface conditions given in Table 2, lines 3 to 7. 6.4 Cast separation The products shall be delivered separated by cast. 7 Requirements 7.1 Chemical composition, hardenability and mechanical properties 7.1.1 General Table 1 shows the combinations of usual heat-treatment conditions at delivery, product forms and requirements as specified in Tables 3 to 10. Except where special steels are ordered in the quenched and tempered condition, the special steels may be supplied with or without hardenability requirements (see Table 1, columns 8 and 9). 7.1.2 Chemical composition 7.1.2.1 The chemical composition determined by cast analysis shall comply with the values in Table 3. 7.1.2.2 Permissible deviations between the limiting values for cast analysis and the values for product analysis are given in Table 4. The product analysis shall be carried out when specified at the time of the enquiry and order (see A.6).



EN 10083-2:2006 (E) 8 7.1.3 Hardenability Where the steel is ordered by using the symbols for normal (+H) or restricted (+HL, +HH) hardenability requirements, the hardenability values given in Table 5, Table 6 or Table 7 shall apply. 7.1.4 Mechanical properties Where the steel is ordered without hardenability requirements, the requirements for mechanical properties specified in Table 9 or Table 10 apply as appropriate for the particular heat treatment condition. In this case, the hardenability values given in Table 5 for special steels are for guidance purposes only. The mechanical property values given in Table 9 and Table 10 apply to test pieces in the quenched and tempered or normalized condition, which have been taken and prepared in accordance with
EN 10083-1:2006, Figure 1 or Figures 2 and 3 (see also footnote a in Table 1). For steel plates > 10 mm thickness and bars > 100 mm diameter in the normalized condition (+N), it may be agreed at the time of enquiry and order that instead of the tensile test the hardness test is performed at the same region, where otherwise the sample for the tensile test piece would be taken from. The hardness test should be performed and from this so that the tensile strength values can be calculated according to EN ISO 18265. The calculated tensile strength shall comply to Table 10. 7.1.5 Surface hardness For the surface hardness of special steels after flame and induction hardening, the specifications in Table 11 apply. 7.2 Machinability All steels delivered in the soft annealed (+A) condition are machinable. Where improved machinability is required, the grades with a specified sulphur range should be ordered and/or with a specific treatment to improve machinability (e.g. Ca treatment), see also Table 3, footnote c. 7.3 Shearability of semi-finished products and bars 7.3.1 Under suitable conditions (avoiding local stress peaks, pre-heating, application of blades with a profile adapted to that of the product, etc.), all steels are shearable in the soft-annealed (+A) and normalized (+N) condition. 7.3.2 Steel grades C45, C45E, C45R, C50E, C50R, C55, C55E, C55R, C60, C60E, C60R and 28Mn6 (see Table 8) and the corresponding grades with requirements on hardenability (see Tables 5 to 7) are also shearable under suitable conditions if they are supplied in the "treated to improve shearability (+S)" condition with the hardness requirements as specified in Table 8. 7.3.3 Under suitable conditions, steel grades C22E, C22R, C35, C35E, C35R, C40, C40E and C40R (see
Table 8) and the corresponding grades with hardenability requirements (see Tables 5 to 7) are shearable in the untreated condition. Shearability may also be assumed for steel grades C45, C45E and C45R with dimensions greater than 80 mm and in the untreated condition. 7.4 Structure 7.4.1 Unless otherwise agreed at the time of enquiry and order, the grain size shall be left to the discretion of the manufacturer. If a fine grain structure is required in accordance with a reference treatment, special requirement A.3 shall be ordered.



EN 10083-2:2006 (E) 9 If steels C35E, C35R, C45E, C45R, C50E, C50R, C55E and C55R are intended for flame or induction hardening, special requirement A.3 shall be ordered in any case. 7.4.2 The special steels shall have a degree of cleanness corresponding to the special steel quality (see A.4 and EN 10083-1:2006, Annex E). 7.5 Internal soundness Where appropriate, requirements relating to the internal soundness of products shall be agreed at the time of enquiry and order, if possible with reference to European standards. EN 10160 specifies requirements of ultrasonic testing of flat products of thickness equal to or greater than 6 mm and EN 10308 specifies requirements of ultrasonic testing of steel bars (see A.5). 7.6 Surface quality 7.6.1 All products shall have a smooth finish appropriate to the manufacturing processes applied, see also 6.3.3. 7.6.2 Minor surface imperfections which may also occur under normal manufacturing conditions, such as scores originating from rolled-in scale in the case of hot-rolled products, shall not be regarded as defects. 7.6.3 Where appropriate, requirements relating to the surface quality of the products shall be agreed on at the time of enquiry and order, if possible with reference to European standards. Sheet/plate and wide flats are delivered with surface class A, subclass 1 according to EN 10163-2 unless otherwise agreed at the time of enquiry and order. Bars and rods are delivered with surface class A according to EN 10221 unless otherwise agreed at the time of enquiry and order. 7.6.4 Requirements relating to the permissible depth of decarburization may be agreed at the time of enquiry and order for special steels. The depth of decarburization shall be determined in accordance with the micrographic method specified in
EN ISO 3887. 7.6.5 If suitability of bars and rods for bright drawing is required, this shall be agreed at the time of enquiry and order. 7.6.6 The removal of surface defects by welding shall only be permitted with the approval of the customer or his or her representative. If surface discontinuities are repaired, the method and maximum depth of removal shall be agreed at the time of enquiry and order. 7.7 Dimensions, tolerances on dimensions and shape The nominal dimensions, tolerances on dimensions and shape for the product shall be agreed at the time of enquiry and order, if possible, with reference to the dimensional standards applicable (see EN 10083-1:2006, Annex D).



EN 10083-2:2006 (E) 10 8 Inspection
8.1 Testing procedures and types of documents 8.1.1 Products complying with this document shall be ordered and delivered with one of the inspection documents as specified in EN 10204. The type of document shall be agreed upon at the time of enquiry and order. If the order does not contain any specification of this type, a test report shall be issued. 8.1.2 For information to be included in a test report, see EN 10083-1:2006, 8.1.2. 8.1.3 For information to be included in an inspection certificate, see EN 10083-1:2006, 8.1.3. 8.1.4 Unless otherwise agreed at the time of the order, inspection of the surface quality and dimensions shall be carried out by the manufacturer. 8.2 Frequency of testing 8.2.1 Sampling Sampling shall be in accordance with Table 12. 8.2.2 Test units The test units and the extent of testing shall be in accordance with Table 12. 8.3 Tests to be carried out for specific inspection 8.3.1 Verification of hardenability, hardness and mechanical properties For steels being ordered without hardenability requirements, i.e. without the symbol +H, +HH or +HL in the designation, the hardness requirements or mechanical properties given for the relevant heat-treatment condition in Table 1, Column 8, subclause 2, shall with the following exception be verified. The requirement given in Table 1, footnote a (mechanical properties of reference test pieces), is only to be verified if supplementary requirement A.1 or A.2 is ordered. For special steels being ordered with the symbol +H, +HH or +HL in the designation (see Tables 5 to 7), unless otherwise agreed, only hardenability requirements according to Tables 5, 6 or 7 shall be verified. 8.3.2 Visual and dimensional inspection A sufficient number of products shall be inspected to ensure compliance with the specification. 9 Preparation of samples and test pieces 9.1 Selection and preparation of samples for chemical analysis The preparation of samples for product analysis shall be in accordance with EN ISO 14284. 9.2 Location and orientation of samples and test pieces for mechanical tests 9.2.1 Preparation of samples Preparation of samples shall be in accordance with Table 12 and EN 10083-1:2006, 9.2.1. 9.2.2 Preparation of test pieces



EN 10083-2:2006 (E) 11 Preparation of test pieces shall be in accordance with Table 12 and EN 10083-1:2006, 9.2.2. 9.3 Location and preparation of samples for hardness and hardenability tests See Table 12. 9.4 Identification of samples and test pieces Samples and test pieces shall be marked so that the original products and their location and orientation in the product is known. 10 Test methods 10.1 Chemical analysis See EN 10083-1:2006, 10.1. 10.2 Mechanical tests See Table 12 and EN 10083-1:2006, 10.2. 10.3 Hardness and hardenability tests 10.3.1 Hardness in treatment conditions +A and +S For products in treatment conditions +A (soft annealed) and +S (treated to improve shearability), the hardness shall be measured in accordance with EN ISO 6506-1. 10.3.2 Verification of hardenability As far as available the manufacturer has the option to verify the hardenability by calculation. The calculation method is left to the discretion of the manufacturer. If agreed at the time of enquiry and order, the manufacturer shall give sufficient information about the calculation for the customer to confirm the result. If a calculation formula is not available or in the case of a dispute an end quench hardenability test shall be carried out in accordance with EN ISO 642. The temperature for quenching shall comply with Table 13. The hardness values shall be determined in accordance with EN ISO 6508-1, scale C.
10.3.3 Surface hardness The surface hardness of steels after flame or induction hardening (see Table 11) shall be determined in accordance with EN ISO 6508-1, scale C. 10.4 Retests See EN 10083-1:2006, 10.4 11 Marking, labelling, packaging The manufacturer shall mark the products or the bundles or boxes in a suitable way so that it is possible to determine the cast, the steel grade and the origin of the delivery (see A.7).



EN 10083-2:2006 (E) 12 Table 1 — Combinations of usual heat-treatment conditions at delivery, product forms and requirements as specified in Tables 3 to 10
1 2 3 4 5 6 7 8 9 x indicates applicable for Applicable requirements if the steel is ordered with the designation given in Table 3 Tables 5, 6 or 7 (special steels only) 1 Heat treatment condition at delivery Symbol Semi- finished products Bars Rod Flat products Hammerand dropforgings 8.1 8.2 9.1 9.2 9.3 2 Untreated none or +U x x x x x a
3 Treated to improve shearability +S x x - x - Table 8 column +Sa 4 Soft annealed+A x x x xb x
Maximum hardness Table 8 column +Aa 5 Normalizedc +N - x - xb x Table 10
Hardenability values according to Table 5, 6 or 7 6 Quenched and tempered +QT - x x xb x
Chemical composition according to Tables 3 and 4
Mechanical properties according to Table 9
As in columns 8.1 and 8.2 (see footnote b in Table 3) Not Applicable 7 Others Other treatment conditions, e.g. certain annealing conditions to achieve a certain structure may be agreed at the time of enquiry and order. The treatment condition annealed for spheroidal carbide (+AC) as required for cold upsetting and cold extrusion is covered by EN 10263-4. a For deliveries in the untreated condition and in the "treated to improve shearability" and "soft annealed" condition, the mechanical properties specified in Tables 9 and 10 shall be
achievable for the ruling end cross-section after appropriate heat treatment (for verification on reference test pieces, see A.1 and A.2). b It is not possible to deliver all dimensions of flat products in this heat-treatment condition. c Normalizing may be replaced by normalizing forming.



EN 10083-2:2006 (E) 13 Table 2 — Surface condition at delivery
1 2 3 4 5 6 7 8 9 x indicates in general applicable for Notes 1 Surface condition at delivery Symbol Semi-finished products (such as blooms, billets) Bars Rod Flat products Hammer and drop forgings (see Note 2 in EN 10083-1:2006,
Clause 1)
2 Unless
otherwise agreed Hot worked None or +HW x x x x x - 3 Unformed continuously cast +CC x - - - - - 4 Hot worked and pickled +PI x x x x x a 5 Hot worked and blast cleaned +BC x x x x x a 6 Hot worked and rough machined +RM - x x - x - 7 Particular conditions supplied by agreement Others
a In addition, it may be agreed that the products be oiled or, where appropriate, limed or phosphated.



EN 10083-2:2006 (E) 14 Table 3 — Steel grades and chemical composition (cast analysis) Steel designation Chemical composition (% by mass)a,b,c Name Number Cd Si max. Mn P max. S Cr max. Mo max. Ni max. Cr + Mo + Ni max.d Quality steels C35 1.0501 0,32 to 0,39 0,40 0,50 to 0,80 0,045 max. 0,045 0,40 0,10 0,40 0,63 C40 1.0511 0,37 to 0,44 0,40 0,50 to 0,80 0,045 max. 0,045 0,40 0,10 0,40 0,63 C45 1.0
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