SIST EN 10343:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Vergütungsstähle für das Bauwesen - Technische LieferbedingungenAciers pour trempe et revenu pour usage de construction - Conditions techniques de livraisonSteels for quenching and tempering for construction purposes - Technical delivery conditions77.140.10Jekla za toplotno obdelavoHeat-treatable steelsICS:Ta slovenski standard je istoveten z:EN 10343:2009SIST EN 10343:2009en,fr,de01-junij-2009SIST EN 10343:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 10343March 2009ICS 77.140.10 English VersionSteels for quenching and tempering for construction purposes -Technical delivery conditionsAciers pour trempe et revenu pour usage de construction -Conditions techniques de livraisonVergütungsstähle für das Bauwesen - TechnischeLieferbedingungenThis European Standard was approved by CEN on 14 February 2009.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 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 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 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 10343:2009: ESIST EN 10343:2009

Ruling sections for the mechanical properties . 26 A.1 Terms and Definitions . 26 A.2 Determination of the diameter of the equivalent ruling section . 26 Annex B (normative)
Dimensional standards applicable to products complying with this European Standard . 28 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 89/106/EEC, EU Construction Products Directive . 29 ZA.1 Scope and relevant characteristics . 29 ZA.2 Procedures for the attestation of conformity of structural metallic construction products . 30 ZA.3 CE marking and labelling . 32
They are manufactured from the direct hardening non alloy steels for quenching and tempering and the direct hardening alloy steels for quenching and tempering and supplied in one of the heat treatment conditions given for the different types of products in Table 1. These steels are generally intended for the manufacture of quenched and tempered parts, but can also be used in the normalized condition. The requirements for mechanical properties are restricted to part sizes given in Tables 4 and 5. NOTE 1 In accordance with EN 10020, the steels covered by this standard are quality and special steels. The differences between quality and special steels are characterized by the following requirements, which are valid for special steels only:  the minimum impact values in the quenched and tempered condition (for non alloy special steels in the case of mean percentages by mass of carbon < 0,50 % only);  limited oxide inclusion content;  lower maximum contents for phosphorus and sulphur. NOTE 2 This standard does not apply for bright steel products.
NOTE 3 This standard only applies for the manufacture of products without any further cold or hot forming and no additional heat treatment, i.e. the properties are according to the delivery condition (+N, +QT). In addition to the specifications of this European Standard, the general technical delivery conditions given in EN 10021 will be applicable unless otherwise specified. 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 10020:2000, Definition and classification of grades of steel EN 10021, General technical delivery conditions for steel products EN 10027-1, Designation systems for steel - Part 1: Steel names EN 10027-2, Designation systems for steel - Part 2: Numerical system SIST EN 10343:2009

EN ISO 14284:2002. 3.1 steels for quenching and tempering engineering steels which because of their chemical composition are suitable for hardening and in the quenched and tempered condition have good toughness at a given tensile strength 3.2 ruling section section for which the specified mechanical properties apply (see Annex A) NOTE Independent of the actual shape and dimensions of the cross-section of the product the size of its ruling section is always given by a diameter. This corresponds to the diameter of an "equivalent round bar". That is, a round bar which, at the position of its cross-section specified for taking the test pieces for the mechanical tests, will, when being SIST EN 10343:2009

1) any particular surface condition (see 6.3.2) 2) any verification of the product analysis (see 7.1.2.2) 3) any fine grain requirements or verification of fine grain size (see 7.3.1); 4) any requirements for the verification of non-metallic inclusion content of special steels (see 7.3.2); 5) any requirement for internal soundness (see 7.4); 6) any requirement relating to surface quality (see 7.5.3); 7) any requirement regarding the permissible depth of decarburization for special steels (see 7.5.4); SIST EN 10343:2009

20 round bars EN 10060 - 20x8000 prEN 10343 – 25CrMo4+QT,
EN 10204 – 3.1, CE or 20 round bars EN 10060 - 20x8000 prEN 10343 – 1.7218+QT,
EN 10204 – 3.1, CE 6 Manufacturing process 6.1 General The manufacturing process of the steel and of the products shall be at the discretion of the manufacturer with the exceptions 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 Heat treatment condition The products shall be delivered in one of the heat-treatment conditions (+N or +QT) given in Table 1, lines 2 and 3. 6.3.2 Surface condition The products shall be delivered in the hot worked surface condition.
If so agreed at the time of enquiry and order products shall be delivered with one of the particular surface conditions given in Table 2, lines 3 to 7 of EN 10083-2:2006 or EN 10083-3:2006. SIST EN 10343:2009

7.1.3 Weldability Steels according to this European standard are not always suitable to weld. Special welding procedures may be required.
7.1.4 Mechanical properties The mechanical property values given in Tables 4 and 5 apply to test pieces in the quenched and tempered or normalized condition which have been taken and prepared in accordance with Figure 1 or Figures 2 and 3. Using test pieces from quenched and tempered flat steel products of thickness less than 10 mm the minimum values for the impact strength given in Table 4 shall be reduced in direct proportion to the cross-sectional area of the test piece. Impact tests shall not be required for nominal thickness < 8 mm and nominal
diameter < 16 mm for quenched and tempered steels and not for nominal thickness and diameter < 16 mm for normalized steels. 7.2 Machinability 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). 7.3 Structure 7.3.1 For non-alloy steels, 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 of EN 10083-2:2006 shall apply. All alloy steels shall have an austenite grain size of 5 or finer, when tested in accordance with EN ISO 643. Regarding verification of fine grain size see A.3 of EN 10083-3:2006. 7.3.2 The special steels shall have a degree of cleanness corresponding to the special steel quality (see B.4 of EN 10083-1:2006). NOTE Segregation is the result of a natural phenomenon. Segregations can be found in ingots as well as slabs, blooms and billets from the continuous casting process. The positive segregation is a concentration of various elements at different locations in the ingot, slab, bloom and billet. In case of flat products customers should note, that these SIST EN 10343:2009

EN ISO 3887. 7.5.5 The removal of surface defects by welding shall only be permitted with the approval of the customer or his representative. If surface discontinuities are repaired, the method and maximum depth of removal shall be agreed at the time of enquiry and order. 7.6 Dimensions, tolerances on dimensions and shape Dimensions and tolerances on dimensions and shape shall be declared by reference to the appropriate European standard (see normative Annex B). Dimensions and tolerances on dimensions and shape of profiles not covered by European Standards shall be in accordance with a national standard valid in the intended place of use of the product or as agreed at the time of enquiry and order. If not agreed during enquiry and order for hot-rolled plates the tolerances on dimensions and shape are applicable according to EN 10029 included class A for the tolerances on thickness and for round bars normal tolerances are applicable according to EN 10060. SIST EN 10343:2009

8.1 Testing procedures and types of documents 8.1.1 Products declaring compliance with this European Standard shall be delivered with an inspection certificate 3.1 or 3.2 as specified in EN 10204. The type of certificate shall be agreed upon at the time of enquiry and order. If the order does not contain any specification of this type, inspection certificate 3.1 shall be issued.
The specific inspection described in 8.3, 10 and 11 shall be carried out and confirmed together with the following information in the inspection certificate: a) the manufacturer's results for the cast analysis of all elements specified in the Table 2 for the steel grade concerned; b) the results of inspections and tests ordered as a result of supplementary requirements (see Annex A of EN 10083-2 and EN 10083-3); c) the symbol letters or numbers relating the inspection certificate, test pieces and products to each other; d) the confirmation that the material complies with the requirements of the order; e) the regulatory information (see Annex ZA). 8.1.2 Unless otherwise agreed at the time of the order, inspection of surface condition and dimensions shall be carried out by the manufacturer (see also 6.3.2). 8.2 Frequency of testing 8.2.1 Sampling Sampling shall be in accordance with Table 6. 8.2.2 Test units The test units and the extent of testing shall be in accordance with Table 6. 8.3 Tests to be carried out for specific inspection 8.3.1 Verification of mechanical properties For steels the mechanical properties given for the relevant heat-treatment condition in Table 1, Column 6, subclause 2, shall be verified. 8.3.2 Visual and dimensional inspection The number of visual and dimensional inspections shall be done dependant of the kind of product to ensure compliance with the specification.
b) in accordance with the rules for families and/or direct or extended application of test results. 9.2.2 Characteristics All characteristics of Clause 7 shall be subject to initial type testing, with following exceptions: a) Weldability is covered by chemical composition; b) Durability is covered by chemical composition; c) Fracture toughness is covered by impact strength, no additional test available; d) Cold formability is covered by elongation, no additional test available; e) Release of dangerous substances is covered by chemical composition. SIST EN 10343:2009

9.2.4.1 Sampling Initial type testing shall be performed on samples of steel products representative for the manufactured steel product type (see Clause 10). 9.2.4.2 Testing
lntensive testing shall be specific inspection and testing in accordance with Clause 11 carried out on the first five casts produced. However, for tensile and impact testing, at least 6 products from each of the five casts shall be tested and where this is not possible test pieces shall be taken from opposite ends of the products being tested. The results of all type tests shall be recorded and held by the manufacturer for at least 10 years after the date when the last product to which they apply was delivered. 9.3 Factory production control (FPC) 9.3.1 General The manufacturer shall establish, document and maintain an FPC system to ensure that the products placed on the market conform to the declared performance characteristics. The FPC system shall consist of written procedures (works' manual), regular inspections and tests and/or assessments and the use of the results to control raw and other incoming materials or components, equipment, the production process and the product. Records shall remain legible, readily identifiable and retrievable. An FPC system conforming with the requirements of EN ISO 9001, and made specific to the requirements of this standard, shall be considered to satisfy the above requirements. The results of inspections, tests or assessments requiring action shall be recorded, as shall any action taken. The action to be taken when control values or criteria are not met shall be recorded and retained for the period specified in the manufacturer’s FPC procedures. 9.3.2 FPC requirements for all manufacturers The manufacturer shall establish procedures to ensure that the production tolerances allow for the steel product performances to be in conformity with the declared values, derived from initial type testing. The characteristics, and the means of verification, are given in the Table 7. The manufacturer shall record the results of the tests specified above. These records shall at least include the following information: a) identification of the steel product tested, b) the date of sampling and testing, c) the test methods performed, SIST EN 10343:2009

The specifications of all incoming raw materials shall be documented, as shall the inspection scheme for ensuring their conformity. The verification of conformity of the raw material with the specification shall be in accordance with EN ISO 9001:2008, 7.4.3. 9.3.3.4 In-process control The manufacturer shall plan and carry out production under controlled conditions. Compliance with EN ISO 9001:2008, 7.5.1 and 7.5.2 shall be deemed to satisfy the requirements of this subclause. 9.3.3.5 Traceability and marking Individual steel products shall be identifiable and traceable with regard to their production origin. The manufacturer shall have written procedures ensuring that processes related to affixing traceability codes and/or markings (see Clause 12) are inspected regularly. Compliance with EN ISO 9001:2008, 7.5.3 shall be deemed to satisfy the requirements of this sub-clause. 9.3.3.6 Non-conforming products The manufacturer shall have written procedures which specify how non-conforming products shall be dealt with. Any such events shall be recorded as they occur and these records shall be kept for the period defined in the manufacturer’s written procedures. Compliance with EN ISO 9001:2008, 8.3 shall be deemed to satisfy the requirements of this sub-clause. 9.3.3.7 Corrective action The manufacturer shall have documented procedures that instigate action to eliminate the cause of non-conformities in order to prevent recurrence. Compliance with EN ISO 9001:2008, 8.5.2 shall be deemed to satisfy the requirements of this sub-clause. SIST EN 10343:2009

Lo = 5,65 0S shall be used. For flat products with a nominal thickness < 3 mm a test piece with constant gauge length in accordance with
EN 1
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