1、 CEN EN*30*223 95 3404589 O328347 T74 BRITISH STANDARD Specification for Surface quality classes for hot-rolled bars and rods - Technical delivery conditions The European Standard EN 10221 : 1995 has the status of a British Standard ICs 77.140.60 77.140.70 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS
2、 PERMITTED BY COPYRIGHT LAW BS EN 10221 : 1996 CEN EN*L0*22L 95 m Amd.No. 3404589 0328348 900 m Date Text affected BS EN 10221 : 1996 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ISEY31, Wrought Steels, upon which the
3、following bodies were represented British Chain Manufacturers Association British Engineerc Cutting Tools Association British Forging Industry Association British Industrial Fasteners Federation British Iron and Steel Producers Association British Stainless Steel Association Department of We and Ind
4、ustry (National Physical Laboratory) Lloyds Register of Shipping Ministry of Defence National Association of Steel Stockholders Road Vehicle Spring Society Society of Motor Manufacturers and Raders Limited Spring Research and Manufacturers Association This British Standard, having been prepared unde
5、r the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1996 O BSI 1996 The following BSI references relate to the work on this standard Committee reference ISW31 Draft for cornent 92/36891 DC ISBN O 580 25801 7 Conte
6、nts Page Committees responsible Inside front cover National foreword Il Foreword 2 Text of EN 10221 : 1995 3 O BSI 1996 i CEN EN*LO*ZZl 95 3404589 Ol28L50 569 BS EN 10221 : 1996 National foreword This British Standard has been prepared by Technical Committee ISEL31 and is the Enghsh language version
7、 of EN 10221 Su?jice quality classes for hot-rolled burs und rods - Technical delivery conditions, published by the European Committee for Standardization (CEN). Cross-reference Publication referred to EN 10079 : 1992l) Corresponding British Standard BS EN 10079 : 1993 Denition of steel products Com
8、pliance with a British Standard does not of itself confer immunity from legal obligations. 1 prEN 10079 is published as EN 10079 : 1992. O BSI 1996 CEN EN*LO*22L 95 = 3404589 0128151 qT5 = EUROPEAN flANDARD EN 10221 NO- EUROPENNE EUROPmlE NORM November 1995 ICs 77.140.60; 77.140.70 Descriptors: iron
9、 and steel products, hot roiied products, bars, wire rod, surface condition, delivery condition, designation, quality classes, inspection, tests English version Surface guality classes for hot-rolled bars and rods - Whnid delivery Conditions Classes de qualit de surface des barres et fils machine la
10、mins chaud - Conditions techniques de livraison Lieferbedingmgen Oberfichengteklassen fin- warmgewalzten Stabstahl und Walzdraht - lkchnische This European Standard was approved by CEN on 199510-20. CEN members are bound to comply with the CENKENELEC Internai Regulations which stipulate the conditio
11、ns for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibiographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exjsts in three offi
12、ciai versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officiai versions. CEN members are the national standards bodies of Austria,
13、Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swizerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de S
14、tassart 36, B-1050 Brussels _ O 1995 Ail rights of reproduction and communication in any form and by any means reserved in ali countries to CEN and its members. Ref. No. EN 10221 : 1995 E Page 2 EN 10221:1995 Foreword This European Standard has been drawn up by a joint working group of ECISS/TC 15,
15、Wire rod - Qualities, dimensions, tolerances and specific tests, (Secretariat: Italy) and ECISSRC 23, Steels for heat treatment, alloy steels and freecutting steels - Qualities, (Secretariat: Germany). This European Standard replaces: prEN 10 1634 Delivery requirements for surjce quality of hot roll
16、ed steel products - Part 4: Round bars and wire rod 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 May 1996, and conflicting national standards shall be withdrawn at the latest by may 1996. Accor
17、ding to the CEN/CENELEC Internal Regulations, the foilowing countries are bound to implement this European Standard Austria, Belgium, Denmark, Finland, France, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kmgdom. Contents 1 2 3
18、 4 4.1 4.2 4.3 5 5.1 5.2 6 Scope Normative references Definitions Requirements Genemi Ordering Designation Testing General Test methods Rep or b2) if the total delivery lot can be checked before processing, the maximum admissible portion, zb, of defective material in the total delivery lot found bef
19、ore processing (see notes 1 and 2); or b3) if it is not possible to check the total delivery lot, special agreements shall be made with regard to the maximum admissible portion, z, of defective material; and c) the type of proof, e.g. by sampling inspection giving the AQL and inspection plan, proof
20、of quality level by statistical process control. NOTE 1. In view of the limitations of continuous inspection equipment for rod relative to the exactness of imperfection depth measurements it is normally only possible to inspect the ends of the coils. Therefore, it cannot be proved that no value grea
21、ter than the specified value is to be found in the coil as a whole. NOTE 2. Additionally, the handling of defective material, e.g. whether it shall be sent back to the manufacturer or scrapped etc. should (also for cases where the total delivery lot is accepted) be agreed at the time of enquiry and
22、order. CEN EN*:LO*:221 95 3404589 0328354 i104 = Page 4 EN 10221:1995 4.3 Designation The required surface finish shall be designated at the time of enquiry and order. a) and b) below give examples of possible designations based on the sampling method specified by the purchaser, e.g. test plan, stat
23、istical process control, etc. a) Example for case bl (see 4.2) Agreed is surface quality class C and a maximum admissible portion za = 2,5 % of defective material in the total delivery lot found during or after further processing, corresponding to the agreed AQL of 2,5 ?h. Designation: Surface quali
24、ty EN 10221 - Class C - za 2,5 - AQL 2,5% b) Example for case b2 (see 4.2) Agreed is surface quaty class C and a maximum admissible portion zb = 0,5 % of defective material in the total delivery lot found before processing; proof corresponding to separate specification. Designation: Surface quality
25、EN 10221 - Class C - zb 0,5 proof . 5 %?sting 5.1 General 5.1.1 The manufacturer takes under his own responsibility and according to his own judgement suitable measures to supervise his production in view of the specied surface quality requirements. NOTE. At the present state of the development, fac
26、ilities for continuous measuring of the depth of defects at high temperatures have serious limitations. The rod manufacturer can normally, after rolling, only check the end of the coils for their compliance with the requirements for surface quality 5.1.2 The purchaser has tota4 freedom to check the
27、surface quaty of the delivered material by methods he regards as suitable. However, disputes shall be resolved using depth discontinuities measured by techniques specified in 5.2.3.2. 5.2 Test methods 5.2.1 Geneml 5.2.1.1 The methods used for detecting discontinuities and measuring the depth of disc
28、ontinuities shall be sufficiently accurate and shall give reproducible results. 5.2.1.2 Nondestructive methods (see 5.2.2.1 and 5.2.3.1) and also technological methods (see 5.2.2.2) are permitted. 5.2.1.3 In cases of dispute, the measures which are carried out in accordance with 5.2.3.2 on products
29、in the delivery condition shall be decisive. 5.2.2 Methods for the detection of discontinuities The foliowing or other suitable methods can be used for the detection of surface discontinuities. 5.2.2.1 Non-destructive methods - visual examination; - magnetic flux method for example magnetic particle
30、 inspection or probe methods; - inductive methods (eddy currents); - dye penetrant - thermography 5.2.2.2 Technological test methods The foliowing tests may be taken into consideration: - wann compression tests; - cold compression tests; - torsion tests (see IS0 7800). 5.2.3 Methods for measuring th
31、e depth of discontinuities 5.2.3.1 Non-destructive test methods SUCIL as: - magnetic flux measurement with rotating or stationary probes; - inductive methods, - potential probe method using direct current; - ultrasonic tests - can oniy determine the depth of discontinuities approxhately 5.2.3.2 The
32、exact determination of the depth of a discontinuity is to be carried out either by grinding the discontinuity down to its root or by examining a metallographic specimen. In both cases, the depth is measured in the radiai direction (see also footnote 2 to table 1). 5.2.4 Production testa on trial bat
33、ches When incoming inspection reveals questionable quahty, the processing of a trial batch may be agreed upon in order to reveal whether the material is acceptable for the intended application. In this case, the size of the trial batch shall be agreed upon. CEN ENLOZZL 95 m 340Li569 0128155 o40 m Pa
34、ge 5 EN 10221:1995 Nominal diameter dN) mm 6 Repairs 6.1 Local imperfections may be removed and defects shall be smoothly removed by grinding within the imits specified in table 1 (note, however, footnote 2 to table 1). 6.2 Repair by welding is only permitted if agreed by the purchaser. No impairmen
35、t of the material properties (e.g. excessive hardening, crack formation) shall result from this. Maximum permissible depth 1 of surface discontinuities3) mm I Table 1. Surface quality classes Class I IE 5sd512 0,15 12 dN 5 40 0,20 0,30 40 dN I60 0,005 . dN 60 dN 5 80 1 The maximum rod diameter is be
36、tween 30 and 60 mm depending on the manufacturers method of rolling. Bars are generally not rolled in diameters of less than 15 mm approximately depending on the manufacturers direction of rolling. 1 The depth of surface discontinuities is measured from the actual surface of the product in radial di
37、rection. The dimensiona tolerance shaii also be considered when determining the section of the fmished part which is assured to be free of discontinuities/defects. 3, If the products are ordered for drawing, no shallow discontinuities or local repairs are permitted which cannot be eliminated by draw
38、ing. 4, This surface quality class shaii be better than class D. The requirements and the method of control shall be agreed upon between the mrties. CEN EN*LO*22L 95 m 3404589 OL28L56 T87 m Page 6 EN 10221 : 1995 2 O E 4, 1111111,1 I 50 1 O0 150 Nominal diameter d N 1 in mm 1, 1, 1, 4, see table i F
39、igure 1. Surface quality classes BS EN 10221 : 1996 BSI 389 Chiswick High Road London w4 4AL CEN EN*III*ZZL 95 = 3404589 0328357 913 BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe an
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