1、 STD=BSI BS EN 10020-ENGL 2000 1b24bb7 0858385 b4T BRITISH STANDARD Definition and classification of grades of steel The European standard EN 100202000 has the status of a British Standard ICs 01.040.77; 77.080.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN L0020:2o0
2、o STD-BSI BS EN LUOZO-ENGL 2000 Lb29bbS 085838b 58b D Amd. No. Date BS EN 100202000 Comments This British Standard, having been prepared under the direction of the Engineering Sector Conunittee, was published under the authority of the standards Committee and comes into effect on 15 July 2000 Nation
3、al foreword This British Standard is the official English language version of EN 100202000. It supersedes BS EN 10020 1991 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISW5, Technical delivery conditions, classification and designation of steels, w
4、hich has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in t
5、he UK A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Stanhds Catalogue under the section entitled “In
6、ternational Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provisions of a contract Users of British Standards are responsible for their correct application. Compliance With
7、a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN titie page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issu
8、ed. O BSI 07-2000 ISBN O 580 34477 O STD=BSI ES EN L0020-ENGL 2000 = Lb24bb9 0858387 qL2 EUROPEAN STANDARD NORME EUROPENNE EUROPAISCHE NORM EN 10020 March 2000 ICs 01.040.77; 77.080.20 Supersedes EN 10020:1988 English version Definition and classification of grades of steel Dfinition et classificati
9、on des nuances dacier Begriffsbestimmung fr die Enteilung der Sthle This European Standard was approved by CEN on 18 February 2000. CEN members are bound to comply with the CENCENELEC Internal Regulations which stipulate the conditions for giving this Europsan Standard the status of a national stand
10、ard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards 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 la
11、nguage made by traislation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as tie official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece
12、, Iceland, Ireland, Italy. Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITITE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FUR NORMUNG Central Secretariat: rue de Stassart. 36 5-1050 Brussels O 2000 CEN All rights
13、of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10020:2000 E Page 2 EN 10020:2000 Contents Foreword . 3 1 2 3 3.1 3.2 3.2.1 3.2.2 3.2.3 4 4.1 4.1.1 4.1.2 4.2 4.3 4.3.1 4.3.2 Scope I . 4 Term and definition - 4 Classification by chemical compositi
14、on . 4 Applicable alloy contents - 4 Definition of classes . 5 Non alloy steels .-. 5 Stainless steels . 5 Other alloy steels 5 Classification of main quality classes 6 Non alloy steels . 6 Non alloy quality steels . . 6 Non alloy special steels .-. . 6 Stainless steels . 7 Other alloy steels 7 Allo
15、y quality steels 7 Alloy special steels . 9 O BSI 07-2000 STD-BSI BS EN 10020-ENGL 2000 1b24bbS 0858387 295 Page 3 EN 10020:2000 Foreword This European Standard has been prepared by Technical Committee ECISSITC 6, Steels - Definition and classification, the secretariat of which is held by AFNOR. Thi
16、s European Standard replaces EN 10020: 1988. 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 2000, and conflicting national standards shall be withdrawn at the latest by September 2000.
17、At the Co-ordination Committee (COCOR) meeting of May 31/June 1, 1995, ECISS decided to revise EN 10020:1988. That standard used EURONORM 20:1974 as the basis for work, revising it to align EN 10020 as far as possible at that time: - with the Harmonised System nomenclature of the World Customs Organ
18、isation (WCO); - with IS0 4948-land IS0 4948-2; - taking into account experience gained from using the EURONORM together with new developments in the steel industry. This European standard is more closely aligned with the Harmonised System in that the same limit values have been adopted for alloy el
19、ements, together with deletion of the previous “70 % rule” for specified combinations of elements. One main quality class in EN 10020:1988, base steels, has been deleted and merged with non alloy quality steels. Further developments in the iron and steel industry and progress in European standardiza
20、tion have also been taken into account. According to the CENICENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Ita
21、ly, Luxembourg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. O BSI 07-2000 STD-BSI BS EN L0020-ENGL 2000 Lb2qbb9 0858390 TU7 Page 4 EN 10020:2000 1 Scope This European Standard defines the term “steel” (see clause 2) and classifies steel grades into: - non alloy,
22、stainless steel and other alloy steels by chemical composition (see clause 3); - main quality classes (see clause 4) defined by main property or application characteristics for non alloy, stainless and other alloy steels. 2 Term and definition For the purposes of this standard, the following term an
23、d definition apply: 2.1 steel material which contains by mass more iron than any other single element, having a carbon content generally less than 2 % and containing other elements. A limited number of chromium steels may contain more than 2 % of carbon, but 2 % is the usual dividing line between st
24、eel and cast iron 3 Classification by chemical composition 3.1 Applicable alloy contents For European Standards the classification given in the product standard or specification applies regardless of the steel which is actually produced, provided that the chemical composition complies with the requi
25、rements of the standard concerned. 3.1.1 determined by the minimum value specified for each element. Classification is based on the ladle analysis specified in the product standard or specification and is 3.1.2 Where for elements other than manganese a maximum value only is specified in the product
26、standard or specification for the ladle analysis, a value of 70 % of this maximum value shall be taken for classification as set out in Tables 1 and 2. For manganese see note a) of Table 1. 3.1.3 Where a product standard or specification is based on product analysis an equivalent ladle analysis is c
27、alculated using the permitted deviations from ladle analysis specified in the product standard or specification or corresponding European Standard or EURONORM. 3.1.4 classification is based on the actual ladle analysis reported by the manufacturer. In the absence of a product standard or specificati
28、on or a precisely specified chemical composition, 3.1.5 The results of product analysis may deviate from those of the ladle analysis to an extent permitted by the appropriate product standard or specification (such deviations do not affect the classification of the steel as non alloy or alloy). If t
29、he product analysis indicates a value, which would place the steel in a class other than intended, then its inclusion in the clas i originally intended shall be separately and reliably substantiated. 3.1.6 product, which has been coated or clad. Composite or coated products are classified according
30、to the specified chemical composition of the 3.1.7 For each alloy element, the specified, calculated or actual ladle analysis value is expressed to the same number of decimal places as the corresponding limit value shown in Table 1. For example in this European Standard a specified range of 0,3 % to
31、 0,5 % corresponds to a range of 0,30 % to 0,50 %. Similarly a specified content of 2 % is taken to mean a content of 2,OO %. 0 BSI 07-2000 Page 5 EN 10020:2000 3.2 Definition of classes 3.2.1 Non alloy steels Non alloy steels are steel grades in which none of the limit values in Table 1 is reached
32、by the contents as defined in 3.1. 3.2.2 Stainless steels Stainless steels are steels with at least 103 % of chromium and max.l,2% of carbon . 3.2.3 Other alloy steels Other alloy steels are steel grades not complying with the definition of stainless steels in which at least one of the limit values
33、in table 1 is reached by the contents as defined in 3.1. Table 1 - Boundary between non alloy and alloy steels (ladle analysis) Specified element 41 3 3i 20 - specified hardness penetration depth or surface hardness in the quenched, quenched and tempered or surface hardened condition; - particularly
34、 low contents of non-metallic inclusions are specified; NOTE This class includes grades where the product standard or specification specifies such limitations of inclusions subject to agreement at the time of ordering. However, specified through thickness reduction of area properties do not change t
35、he classification of the original steel. - specified maximum phosphorus and sulphur content: - for ladle analysis I 0,020 %; - for product analysis 5 0,025 %. (e.g. rod for high strength springs, electrodes, tyre cord wire); - specified minimum impact strength on Charpy-V-notch test pieces at - 50 “
36、C greater than 27 J for test pieces taken in the longitudinal direction or greater than 16 J for test pieces taken in the transverse direction); 1) If no impact value is specified at - 50 “C the value specified between - 50 “C and - 60 “C shall be used. O BSI 07-2000 STD-BSI BS EN 10020-ENGL 2000 1b
37、29bb9 0858393 71b Page 7 EN 10020:2000 - steels for nuclear reactors having the following specified elements simultaneously restricted on product analysis to: - copper I 0,lO %, cobalt I 0,05 %, vanadium I0,05 %; - specified electrical conductivity 9 S.m/mm2; - precipitation hardening steels with mi
38、nimum specified carbon contents of 0,25 % or more in the ladle analysis and a ferritidpearlitic microstructure, containing one or more micro alloy elements such as niobium or vanadium with contents less than the limit values for alloy steels. Precipitation hardening is generally achieved by controll
39、ed cooling from the hot forming temperature; - prestressing steels. 4.2 Stainless steels Stainless steels are defined by chemical composition in 3.2.2. They are subdivided further according to the following criteria: - by nickel content into: - nickel less than 2,5 %; - nickel 2,5 % or more. - by ma
40、in property into: - corrosion resisting; - heat resisting; - creep resisting. 4.3 Other alloy steels 4.3.1 Alloy quality steels 4.3.1 .I General description Alloy quality steels are steel grades for which requirements exist with regard to, for example, toughness, grain size control andlor formabilit
41、y. Alloy quality steels are not generally intended for quenching and tempering or for surface hardening. 4.3.1.2 Definition Alloy quality steels are given in 4.3.1.2.1 to 4.3.1.2.5. 4.3.1.2.1 those defined in 4.3.1.2.3 which meet all the following conditions: Weldable fine grained structural steels,
42、 including steels for pressure vessels and tubes, other than - specified minimum yield strength 380 N/md for thickness I 16 mm; - alloy contents as defined by 3.1 are less than the limit values given in Table 2; O BSI 07-2000 Page 8 EN 10020:2000 Specified element Cr Chromium Cu Copper Mn Manganese
43、Mo Molybdenum Nb Niobium Ni Nickel Ti Titanium V Vanadium - specified minimum impact strength on Charpy-V-notch test pieces at - 50 “CI 27 J for test pieces taken in the longitudinal direction or I 16 J for test pieces taken in the transverse direction 1) Limit value % by mass 050 0,50 1,80 0,lO 0,0
44、8 0,50 0,12 0,12 Zr Zirconium 0,12 4.3.1.2.2 4.3.1.2.3 3) refining elements such as boron, niobium, titanium, vanadium and/or zirconium or dual phase steels . Alloy steels for rails, sheet piling and mining frames. Alloy steels for hot or cold rolled flat products for severe cold forming application
45、s containing grain 2) 4.3.1.2.4 Alloy steels in which copper is the only Specified alloy element. 4.3.1.2.5 Alloy electrical steels are steels mainly containing silicon or silicon and aluminium as alloying elements to meet specified requirements for maximum values of specific total loss or minimum v
46、alues of magnetic induction, polarization or permeability ) *) 3, isolated areas uniformly dispersed throughout. If no impact value is specified at - 50C the value specified between - 50C and - 60C shall be used. Excluding steels for pressure vessels or tubes. Dual phases steels have a microstructur
47、e which is essentially ferritic, with about 10% to 35 % of martensite in small O BSI 07-2000 STD-BSI BS EN 10020-ENGL 2000 lb2Libb 0858375 577 m Page 9 EN 10020:2000 4.3.2 Alloy special steels 4.3.2.1 General description This class includes steel grades other than stainless steels for which are char
48、acterized by precise control of chemical composition and particular conditions of manufacture and process control to ensure improved properties which are frequently specified in combination and within closely controlled limits. 4.3.2.2 Definition All other alloy steels, which are not excluded by the
49、 definition given in 4.3.1 for alloy quality steels are alloy special steels. Alloy special steels include alloy engineering steels and alloy steels for pressure vessels, bearing steels, tool steels, high-speed steels, and steels with special physical properties such as ferritic-nickel steels with controlled expansion coeficient, or electrical resistance steels. O BSI 07-2000 BS EN 10020:2000 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It pres
