EN 10085:2001

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Nitrierstähle - Technische LieferbedingungenAciers pour nitruration - Conditions techniques de livraisonNitriding steels - Technical delivery conditions77.140.10Jekla za toplotno obdelavoHeat-treatable steelsICS:Ta slovenski standard je istoveten z:EN 10085:2001SIST EN 10085:2002en01-september-2002SIST EN 10085:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10085March 2001ICS 77.140.10English versionNitriding steels - Technical delivery conditionsAciers pour nitruration - Conditions techniques de livraisonNitrierstähle - Technische LieferbedingungenThis European Standard was approved by CEN on 19 January 2001.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 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 of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10085:2001 ESIST EN 10085:2002

Page 2EN 10085:2001ContentsForeword 31Scope 42Normative references43Terms and definitions54Classification and designation64.1Classification64.2Designation65Information to be supplied by the purchaser65.1Mandatory information65.2Options76Manufacturing process86.1General86.2Heat-treatment and surface condition at delivery86.3Cast separation87Requirements87.1Chemical composition, hardness and mechanical properties87.2Shearability87.3Structure87.4Internal soundness97.5Surface quality and decarburization97.6Dimensions, tolerances on dimensions and shape98Inspection and testing98.1Types and contents of inspection documents98.2Specific inspection and testing109Marking11Annex A (normative): Ruling sections for the mechanical properties22Annex B (normative): Supplementary or special requirements24Annex C (informative): Heat treatment
25Annex D (informative): Dimensional standards applicable to products complying26with this European StandardBibliography27SIST EN 10085:2002

Page 3EN 10085:2001ForewordThis European Standard has been prepared by Technical Committee ECISS/TC 23 “Steels for heattreatment, alloy steels and free-cutting steels - Qualities and dimensions”, the secretariat of which isheld by DIN.This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorsement, at the latest by September 2001, and conflicting national standardsshall be withdrawn at the latest by September 2001.According to the CEN/CENELEC Internal Regulations, the national standards organizations of
thefollowing countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 10085:2002

Page 4EN 10085:20011
Scope1.1
This European Standard specifies the technical delivery requirements for—semi-finished products, e. g. blooms, billets, slabs (see NOTE 3);—bars (see NOTE 3);—rod;—wide flats;—hot- or cold-rolled strip and sheet/plate;—forgings (see NOTE 3)manufactured from the nitriding steels listed in Table 3 and supplied in one of the heat-treatmentconditions given for the different types of products in Table 1, line 2 to 4 and in one of the surfaceconditions given in Table 2.The steels are, in general, intended for the fabrication of quenched and tempered and generallymachined and subsequently nitrided parts.NOTE 1
Some grades from EN 10083-1 are also used for nitriding treatment.NOTE 2
Related European Standards are given in Bibliography.NOTE 3
Hammer-forged semi-finished products (blooms, billets, slabs etc.) and hammer-forged bars are inthe following covered under semi-finished products or bars and not under the term “forgings”.1.2
In special cases, variations in these technical delivery requirements or additions to them mayform the subject of an agreement at the time of enquiry and order (see annex B).1.3
In addition to the specifications of this European Standard, the general technical deliveryrequirements of EN 10021 are applicable.2
Normative referencesThis European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisions of anyof these publications apply to this European Standard only when incorporated in it by amendment orrevision. For undated references the latest edition of the publication referred to applies (includingamendments).EN 10002-1, Metallic materials - Tensile testing - Part 1: Test method (at ambient temperature)“including Addendum AC1:1990"EN 10020, Definition and classification of grades of steelSIST EN 10085:2002

Page 5EN 10085:2001It may be agreed at the time of ordering, until these EURONORMS have been1)adopted as European Standards, that these EURONORMS or the correspondingnational standards should be applied.EN 10021, General technical delivery requirements for steel and iron productsEN 10027-1, Designation systems for steel - Part 1: Steel names, principal symbolsEN 10027-2, Designation systems for steel - Part 2: Numerical systemEN 10045-1, Metallic materials - Charpy impact test - Part 1: Test methodEN 10052, Vocabulary of heat treatment terms for ferrous productsEN 10079, Definition of steel productsEN 10163-2, Delivery requirements for surface condition of hot-rolled steel plates, wide flats andsections - Part 2: Plates and wide flatsEN 10204, Metallic products - Types of inspection documents (includes amendment A1:1995)EN 10221, Surface quality classes for hot-rolled bars and rods - Technical delivery conditionsCR 10260, Designation systems for steels - Additional symbols CR 10261, ECISS IC 11 - Iron and steel - Review of available methods of chemical analysisEN ISO 377, Steel and steel products - Location and preparation of samples and test pieces formechanical testingEN ISO 6506-1, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:1999)EURONORM 103, Microscopic determination of the ferritic or austenitic grain size of steels1)EURONORM 104, Determination of the depth of decarburization of non-alloy and low alloy1)structural steelsISO 14284, Steel and iron - Sampling and preparation of samples for the determination of chemicalcomposition3 Terms and definitionsFor the purpose of this European Standard, the following terms and definitions apply in addition tothe terms and definitions given in EN 10020, EN 10052, EN 10079, EN ISO 377 and ISO 14284.SIST EN 10085:2002

Page 6EN 10085:20013.1ruling sectionthat section for which the specified mechanical properties applyIndependent of the actual shape and dimensions of the cross-section of the product the size of itsruling section is always given by a diameter. This corresponds to the diameter of an “equivalentround bar”. That is, a round bar which, at the position of its cross-section specified for taking thetest pieces for the mechanical tests, will, when being cooled from austenitizing temperature, showthe same cooling rate as the actual ruling section of the product concerned at its position for takingthe test pieces.3.2nitriding steelsheat-treatable steels containing controlled amounts of two or more of the nitride forming elementsaluminium, chromium, molybdenum, vanadium, making them particularly suitable for nitriding4
Classification and designation4.1
ClassificationAll steels covered by this European Standard are classified as alloy special steels according toEN 10020.4.2
Designation4.2.1
Steel namesFor the steel grades covered by this European Standard, the steel names as given in the relevanttables are allocated in accordance with EN 10027-1 and CR 10260.4.2.2
Steel numbersFor the steel grades covered by this European Standard, the steel numbers as given in the relevanttables are allocated in accordance with EN 10027-2.5
Information to be supplied by the purchaser5.1
Mandatory informationThe following information shall be supplied by the purchaser at the time of enquiry and order:a)the quantity to be delivered;b)the designation of the product form (e. g. round or square);c)the number of the dimensional standard;d)the dimensions and tolerances on dimensions and shape and, if applicable, letters denotingrelevant special tolerances;SIST EN 10085:2002

Page 7EN 10085:2001e)the number of this European Standard (EN 10085);f)steel name or steel number (see 4.2);g)if appropriate, the symbol for the heat treatment condition at delivery (see 6.2.1, 6.2.2 and Table1);h)if appropriate, the symbol for the surface condition at delivery (see 6.2.3 and Table 2);i)if required, the type of inspection document in accordance with EN 10204 (see 8.1).EXAMPLE20 rounds EURONORM 60 - 20x8000EN 10085 - 34CrAlNi7-10+AEN 10204 - 3.1.Bor20 rounds EURONORM 60 - 20x8000EN 10085 - 1.8550+AEN 10204 - 3.1.B5.2
OptionsA number of options are specified in this European Standard and listed below. If the purchaser doesnot indicate his wish to implement one of these options, the supplier shall supply in accordance withthe basis specification of this European Standard (see 5.1).a)any special requirement on grain size (see 7.3.1 and 8.2.2);b)any requirement concerning the admissible ferrite content in the core (see 7.3.2);c)any requirement for internal soundness (see 7.4 and B.3);d)any requirement relating to surface quality (see 7.5.3);e)any requirement regarding the permissible depth of decarburization (see 7.5.4);f)any requirement relating to removal of surface defects (see 7.5.5);g)any verification of the mechanical properties of reference test pieces in the quenched andtempered condition (see 8.2.1.1 and B.1);h)any requirement concerning special marking of the product (see clause 9 and B.5);i)any verification of the product analysis (see Table 8 and B.4);j)any requirement concerning non-metallic inclusion content (see B.2).SIST EN 10085:2002

Page 8EN 10085:20016
Manufacturing process6.1
GeneralThe manufacturing process of the steel and of the products is left to the discretion of themanufacturer with the restrictions given by the requirements in 6.2 and 6.3.6.2
Heat-treatment and surface condition at delivery6.2.1
Normal condition at deliveryUnless otherwise agreed at the time of enquiry and order, the products shall be delivered in theuntreated, i. e. as rolled condition (see Table 2, NOTE a).6.2.2
Particular heat-treatment conditionIf 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 2 to 4.6.2.3
Particular surface conditionIf so agreed at the time of enquiry and order, the products shall be delivered in one of the particularsurface conditions given in Table 2, lines 3 to 6.6.3
Cast separationThe steels shall be delivered separated by casts.7
Requirements7.1
Chemical composition, hardness and mechanical propertiesThe requirements for chemical composition, hardness and mechanical properties cited in Table 1,column 9, apply as appropriate for the particular heat-treatment condition.The requirements for mechanical properties given in this European Standard are restricted to thesizes given in Table 6.7.2
ShearabilityUnder suitable shearing conditions (avoiding local stress peaks, preheating, application of bladeswith a profile adapted to that of the product etc.) all steels are shearable in the condition “soft annealed”. 7.3
Structure7.3.1 Unless otherwise agreed, the steel when tested in accordance with one of the methodsdescribed in EURONORM 103 shall show an austenitic grain size of 5 or finer.7.3.2 Requirements for the ferrite content in the core may be agreed at the time of enquiry and order.SIST EN 10085:2002

Page 9EN 10085:20017.4
Internal soundnessThe steel shall be free from internal defects likely to have an adverse effect (see B.3).7.5
Surface quality and decarburization7.5.1
All products shall have a workmanlike finish.7.5.2
Minor surface imperfections, which may occur under normal manufacturing conditions, suchas scores originating from rolled-in scale in the case of hot-rolled products, shall not be regarded asdefects.7.5.3
Where appropriate, requirements relating to surface quality of the products shall be agreed onat the time of enquiry and order, if possible with reference to European Standards.EN 10163-2 specifies requirements for the surface quality of hot-rolled sheet/plate and wide flats.EN 10221 contains surface quality classification for hot-rolled bars and rods.NOTE
It is more difficult to detect and elimininate surface discontinuities from coiled products than from cutlengths. This should be taken into account when agreements on surface quality are made.7.5.4
Requirements may be specified at the time of enquiry and order regarding the permissibledepth of decarburization.The depth of decarburization shall be determined in accordance with the micrographic methodspecified in EURONORM 104.7.5.5
Repair of surface discontinuities by welding is not permitted.If surface discontinuities are to be repaired, the method and permissible maximum depth of removalshould be agreed at the time of enquiry and order.7.6
Dimensions, tolerances on dimensions and shapeThe nominal dimensions, tolerances on dimensions and shape for the product shall be agreed at thetime of enquiry and order, if possible, with reference to the dimensional standards applicable (seeannex D).8
Inspection and testing8.1
Types and contents of inspection documents8.1.1 For each delivery, the issue of any inspection document according to EN 10204 may be agreedupon at the time of enquiry and order.8.1.2
If, in accordance with the agreements made at the time of enquiry and order, a test report is tobe provided, this shall cover:SIST EN 10085:2002

Page 10EN 10085:2001a) the statement that the material complies with the requirements of the order;b) the results of the cast analysis for all elements specifie
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