1、DEUTSCHE NORM January 1996 DIN Surface quality classes for hot rolled steel bars and rod EN 10221 Technical delivery conditions Enalish version of DIN EN 10221 c o m .- - L s o U a F z L p - c 3 o) o) - o c o P B - o c o Y) Y) .- .- E Q o Q al L .- 6 o 5 3 +. 3 .- u o o 3 U 2 t m n z ? U c m c Y) c
2、r .- c m o o z o ICs 77.140.60; 77.140.70 Descriptors: Steel, surface quality, bars, rod. Oberflchengteklassen fr warmgewalzten Stabstahl und Walzdraht; technische Lieferbedingungen European Standard EN 10221 :I995 has the status of a DIN Standard. A comma is used as the decimal marker. National for
3、eword This standard has been prepared by ECISSTTC 15. The responsible German body involved in its preparation was the Normenausschu Eisen und Stahl (Steel and Iron Standards Committee), Technical Committee Maschinenbausthle. DIN 51 212 is the standard corresponding to International Standard IS0 7800
4、 referred to in clause 2 of the EN. Standard referred to (and not included in Normative references) DIN 51 212 Torsion testing of wire EN comprises 4 pages. Eeuih Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). 07.96 DIN EN 1022 1 Engl. Price group 6 Sales No.
5、 11 06 EUROPEAN STANDARD NORME EUROPENNE EUROPKISCHE NORM EN 10221 Novem ber 1995 ICs 77.140.60; 77.140.70 Descriptors: Steel, surface quality, bars, rod. English version Surface quality classes for hot-rolled bars and rods Technical delivery conditions Classes de qualit de surface des barres et fil
6、s machine lamins chaud; condi- tions techniques de livraison Oberfichengtekassen fr warmge- walzten Stabstahl und Waizdraht; technische Lieferbedingungen This European Standard was approved by CEN on 1995-10-20. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipu- la
7、te the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographicai references concerning such national standards may be obtained on application to the Centrai Secretariat or to any CEN member. This European Standard exis
8、ts in three official 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 official versions. CEN members are the national standards bod
9、ies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secr
10、etariat: rue de Stassart 36, B-IO50 Brussels Q 1995. All rights of reproduction and communication in any form and by any means reserved in all countries to GEN and its members. Ref. No. EN 10221 :1995 E Page 2 EN 10221 :1995 Contents Page 1 Scope . 2 2 Normative references . 2 3 Definitions . 2 4 Re
11、quirements 2 4.1 General 2 4.3 Designation . 3 5 Testing 3 5.1 General 3 5.2 Test methods . 3 6 Repairs . 3 4.2 Ordering . 3 Foreword This European Standard has been drawn up by a joint working group of ECISS/TC 15 Wire rod; qualities, dimensions, tolerances and specific tests (Secretariat: Italy) a
12、nd EGISS/TC 23 Steels for heat treatment, alloy steels and free-cutting steels; qualities (Secretariat: Germany). It supersedes: prEN 10163-4 Delivery requirements for surface quality of hot rolled steel products. Part 4: Round bars and wire rod This European Standard shall be given the status of a
13、national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by May 1996 at the latest. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium,
14、Denmark, Finland, France, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 1 Scope 1.1 This European Standard specifies requirements for the surface quality of hot rolled round bars and rod with nominal diameters, d, from
15、5 mm to 150 mm. 1.2 Subject to agreement between the manufacturer and purchaser, this European Standard may be applied also for squares, hexagons and octagons. 1.3 This European Standard applies particularly for steels for engineering applications, but may by agreement also be applied for general st
16、ructural steels or tool steels. 1.4 This European Standard does not include any re- quirements for the permissible depth of surface decarburi- zation. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These nor- mative refe
17、rences are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For un- dated references,
18、 the latest edition of the publication re- ferred applies. EN 10079 IS0 7800: 1984 Metallic materials; wire; simple torsion Definitions of steel products test 3 Definitions For the purposes of this European Standard, the following definitions apply: 3.1 delivery lot: Unless otherwise specified in th
19、e order or in the appropriate product standard, a quantity of steel of the same type and the same diameter ordered with the same requirements for the surface quality, and delivered at the same time. 3.2 bars, rod: See prEN 10079. 3.3 discontinuities: Surface discontinuities are geomet- ric irregular
20、ities projecting inwards. 3.3.1 imperfections: Discontinuities with a depth equal to or less than the specified limiting value. 3.3.1.1 sharp discontinuities: All discontinuities which may act as a notch, such as laps, seams and cracks. 3.3.1.2 shallow discontinuities: Discontinuities which have a l
21、ess notch-like effect and which have a more shallow aspect, such as rolled-in scale and slivers. 3.3.2 defects: Discontinuities with a depth greater than the specified limiting value. 4 Requirements 4.1 General The surface requirements are classified according to ta- ble l and figure l. If the appro
22、priate European Standard or EURONORM specifying the quality requirements for the Page 3 EN 10221 :1995 material does not contain exact specifications, the required surface quality class and the admissible portion of defec- tive material shall be stated in the order as indicated in 4.2. 4.2 Ordering
23、The following details shall be given in the order: a) the surface quality class (see table 1) and either, bl) if the original depth of the surface discontinuities can still be determined after the processing of the ma- terial, the maximum admissible portion za of defective material in the total deli
24、very lot found during or after further processing (see notes 1 and 2) or, b2) if the total delivery lot can be checked before processing, the maximum admissible portion zb of de- fective material in the total delivery lot found before processing (see notes 1 and 2) or, b3) if it is not possible to c
25、heck the total delivery lot, special agreements shall be made with regard to the maximum admissible portion z of defective material; c) the type of proof (e.g. by sampling inspection giving the AQL and inspection plan, proof of quality level by statistical process control). NOTE 1: Given the limitat
26、ions of continuous inspec- tion equipment for rod relative to the exactness of imperfection depth measurements, it is normally only possible to inspect the ends of the coils. There- fore, it cannot be proved that no value greater than the specified value is to be found in the coil as a whole. NOTE 2
27、: Additionally, the handling of defective material (e.g. whether it shall be sent back to the manufacturer or scrapped) should - also for cases where the total delivery lot is accepted - be agreed at the time of ordering. 4.3 Designation The required surface finish shall be designated at the time of
28、 ordering. Items a) and b) below give examples of possi- ble designations based on the sampling method specified by the purchaser (e.g. test plan, statistical process control etc.). a) Example for case bl (see 4.2) Agreed is surface quality class C and a maximum ad- missible portion za = 2,5 % of de
29、fective material in the total delivery lot found during or after further process- ing, corresponding to the agreed AQL of 2,5%. Designation: Surface quality EN 10221 - Class C - za 2,5 - AQL 2,5 % b) Example for case b2 (see 4.2) Agreed is surface quality class C and a maximum ad- missible portion z
30、b = 0,5 % of defective material in the total delivery lot found before processing; proof corre- sponding to separate specification. Designation: Surface quality EN 10221 - Class C - zb 0,5 Proof 5 Testing 5.1 General 5.1.1 The manufacturer shall assume responsibility for supervising his production i
31、n view of the specified surface quality which he deems suitable. NOTE: At the present state of the art, facilities 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 the
32、ir compliance with the requirements for surface quality. 5.1.2 The purchaser is free to check the surface quality of the product by any methods he deems suitable. However, disputes shall be resolved using depth discontinuities measured by techniques as specified in 5.2.3.2. 5.2 Test methods 5.2.1 Ge
33、neral 5.2.1 .I The methods used for detecting discontinuities and measuring the depth of discontinuities shall be suffi- ciently accurate and shall give reproducible results. 5.2.1.2 Both non-destructive methods (see 5.2.2.1 and 5.2.3.1) and technological methods (see 5.2.2.2) may be used. 5.2.1.3 I
34、n cases of dispute, the measurements carried out in accordance with 5.2.3.2 on products in their as delivered condition shall be decisive. 5.2.2 Methods for the detection of discontinuities The following or other suitable methods may be used for the detection of surface discontinuities. 5.2.2.1 Non-
35、destructive methods: - visual examination; - magnetic flux method (e.g. magnetic particle inspec- tion) or probe methods; - inductive methods (eddy current testing); - dye penetrant inspection; - thermography. 5.2.2.2 Technological methods: - warm compression test; - cold compression test;, - torsio
36、n test (see IS0 7800). 5.2.3 Methods for measuring the depth of discontinuities 5.2.3.1 Non-destructive test methods such as - magnetic flux measurement with rotating or station- ary probes, - inductive methods, - potential probe method using direct current, - ultrasonic tests only permit the depth
37、of discontinuities to be roughly deter- mined. 5.2.3.2 The exact determination of the depth of a discon- tinuity is to be carried out either by grinding the discontinu- ity down to its root or by examining a metallographic sec- tion. In both cases, the depth is to be measured in the radial direction
38、 (ci. footnote 2 to table 1). 5.2.4 Production tests on trial batches When receiving inspection reveals a questionable quality, the processing of a trial batch may be agreed upon in order to reveal whether the material is acceptable for the in- tended application. In this case, the size of the trial
39、 batch shall be agreed upon. 6 Repairs 6.1 Local imperfections may be removed and defects shall be smoothly removed by grinding within the limits specified in table 1 (note, however, footnote 2 to table 1). Page 4 EN 10221 :1995 Nominal diameter, d”), in mm 6.2 Repair by welding is only permitted if
40、 agreed by the purchaser. No impairment of the material properties (e.g. excessive hardening, crack formation) shall result from this. Maximum permissible depth2) of surface discontinuities3), in mm Table 1: Surface quality classes 12dI 18 18d 30 Class 0,25 0,30 A 5d 12 12d 40 B 0,15 0,20 C D E 55dN
41、5 12 I 0,20 30d120 I 0,0075 * dN 40 dN 60 I 0,005 * dN 60 dN 80 I 0,30 l) The maximum rod diameter is between 30 and 60 mm depending on the manufacturers method of rolling. Bars are generally not rolled in diameters of less than about 15 mm, depending on the manufacturers direction of rolling. *) Th
42、e depth of surface discontinuities is measured from the actual surface of the product in radial direction. The dimensional tolerance shall also be considered when determining the section of the finished part which is as- sured to be free of discontinuities or defects. 3, If the products are ordered
43、for drawing, no shallow discontinuities or local repairs which cannot be elimi- nated by drawing are permitted. 4, This surface quality class shall be better than class D. The requirements and the method of control shall be agreed upon between the parties. Nominal diameter, dNi), in mm Figure 1: Surface quality classes For l) * ) 3, 4), see table 1.
