1、BRITISH STANDARD Dimensions and BS EN 10278:1999 tolerances of bright I steel products I The European Standard EN 10278: 1999 has the status of a British Standard ICs 77.140.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW COPYRIGHT European Committee for StandardizationLice
2、nsed by Information Handling ServicesBS EN 102781999 Amd.No. National foreword Date Comments This British Standard is the English language version of EN 102781999. Together with BS EN 10277 parts 1 to 5 this standard supersedes BS 97M1991 which is withdrawn. The UK participation in its preparaion wa
3、s entrusted to Technical Committee ISMl, Wrought steels, which has the responsibiiily to: - aid enmen to understand the text; - present to the responsible European committee any enquiries on the - monitor related intemationai and European developments and promulgate interpretation, or proposals for
4、change, and keep the UK interests informed; them in the 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 th
5、e BSI Standards Catalogue under the section entitled “international Sandards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all he necessary provisions of a contract. Users of British Standards are resp
6、onsible for their correct application. Compliance with 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 title page, pages 2 to 7 and a back cover. The BSI copynght notice displayed in t
7、his document indicates when the document was last issued. This British Standard, hawig been prepared under the dimtion of the Engineeing Sector Commime, was published under the authority of the Standards Committee and comes into effect on 15 December 1999 O BSI 12-1999 ISBN O 580 35387 7 Amendments
8、issued since publication COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesSTD-BSI BS EN L0278-ENGL 1999 D 1624bb9 Ofllb878 537 .I EUROPEAN STANDARD EN 10278 NO= EUR0PEE”E EUROP c) the number of this European Standard (EN 10278); d) the dimensions and tolerance
9、s on dimensions and shape; e) reference to the material standard including the number of the part (e.g. EN 10277-3); f) steel name or steel number, g) the finished condition (see 6.1); h) the class of surface quahty (see EN 10277-1) where appropriate. EXAMPLE 1 2 t rounds EN 10278 - 20 h9 X stock 6
10、O00 EN 10277338SMn28+C - class3 or 2 t rounds EN 10278 - 20 h9 X stock 6 O00 EN 10277-3-1.0760tC - clacs3 EXAMPLE 2 10 t rounds EN 10278 - 50 h8 X stock 3 O00 EN 100883-X5CrNi1810+2P - class 2 or 10 t rounds EN 10278 - 50 h8 X stock 3 o00 EN 10088-3-1.4301+2P - 2 4.2 Supplementary information The fo
11、llowing supplementary information may be supplied by the purchaser and as agreed with the manufacturer: a) disposition of tolerances (see A. i); b) end condition (see A.2); c) straightness (see 6.4); d) if required, the type of inspection document in accordance with EN 10204. 5 Condition of delivery
12、 6.1 Finished condition The steel product shall be delivered in one or a combination of the following finished conditions with or without heat tseatment: a) dram, symbol +C; b) tuned, symbol +SH c) ground, symbol +SL; d) polished, symbol +PL. 5.2 End condition Unless otherwise agreed at the time of
13、enquiry and order, the method of cutting shall be left to the discretion of the manufacturer. Where specified at the time of enquiry and order, end conditions may be specified in accordance with A.2. O BSI 12-1999 COPYRIGHT European Committee for StandardizationLicensed by Information Handling Servi
14、cesPage 4 EN 1027 b) for hexagon and square drawn bars: hll for dimensions 580 mm, h12 for dimensions 80 mm, accordmg to Tables 1 and 2; c) for drawn flats: in accordance with Table 3; d) for ground products: h9 in accordance with Tables 1 and 2; e) for drawn round bars in the final quenched and tem
15、pered condition: hll, according to Tables 1 to 3. 6.1.3 Where specified by the purchaser at the time of enquiry and order, the disposition tolerances specified in Table 2 shail be in accordance with A.l. 6.2 Spes of length and length tolerances Unless otherwise agreed at the time of enquiry and orde
16、r, the length and the tolerance on length shall be as specified in Table 5. 6.3 Out of round Maximum deviation from “out of round“ shall be not more than haif the specified tolerance and in any case never above the upper limit of the tolerance. 6.4 Straightness tolerance Where specified at the time
17、of enquiry and order and in cases of dispute, an agreed number of bars shall be evaluated for straightness in accordance with one of the methods specified in annexB and the tolerances specified in Table 4 shall apply. Tolerance class to IS0 286-2 h9 I h10 I hll I h12 h6 I h, I hs I 6.6 Edges of non-
18、round bars Non-round bars (i.e. square, hexagon and sat in widths I 150 mm may have an undefined profile withh a distance of 0,2 mm of the hypotheticai edge, flats in widths 150 mm within a distance of 0,5 nun, unless otherwise agreed. For widths 150 mm the corner proie may be undefined within a dis
19、tance of 0,5 mm of the hypothetical edge, unless sharp corners have specifically been ordered. Tunied Ground 7 Inspection and testing A sufficient number of samples shall be inspected for dimensionai compliance. Dimensional inspection shaii be carried out as follows: a) for round bars: not less than
20、 150 nun from the end of the bar; b) for round bars cut to length: not less than 10 mm from the end of the bar, c) for shapes other than round not less than 25 mm from the end of the bar. RRR R R R R R R R R Table 1 - Tolerance class according to finished condition Nominal dimension mm Tolerance cla
21、ss to IS0 286-2l) h6 h7 I hS h9 hlO hll 1 h12 1 to 13 3 to 56 6 to 510 10 to 118 18 to 130 30 to 550 I I 0,006 0,010 0,014 0,025 0,040 0,060 0,100 0,008 0,012 0,018 0,030 0,048 0,075 0,120 0,m 0,015 0,022 0,036 0,058 0,090 0,150 0,011 0,018 0,027 0,043 0,070 0,110 o, 180 0,013 0,02 1 0,033 0,052 0,0
22、84 0,130 0,210 0.016 0.025 0,039 0,062 o, 100 0,160 0,250 Polished IR (R IR (R (R IR (R R = round, S = souare. H = hexagon. 50 to 580 80 to 1120 120 to 5180 0,019 I 0,030 0,046 0,074 I0,120 0,190 0,300 I 0,022 0,035 0,054 0,087 0,140 0,220 0,350 0,025 0,040 0,063 0,100 o, 160 0,250 0,400 180 to 5200
23、 I 0,029 I 0,046 10,072 10,115 10,185 10,290 10,460 I The above deviation values are negahvely disposed about the nomal dimension For example a 20 mm nominal diameter having a tolerance class h9 IS 20 mm + O, -0,052 mm or 19,948/20,000 mm O BSI 12-1999 COPYRIGHT European Committee for Standardizatio
24、nLicensed by Information Handling ServicesPage 6 EN 102781999 Width mm Table 3 - Tolerance for drawn flats Deviation mm mm 5 18 18 530 230 150 IS0 286-2 class +O -0,ll hll +O -0,13 hll +O -0,16 hll 250 580 I +o 780 5100 I +o -0,19 hl 1 -0,22 hll loo 5150 +O,W 150 5200 +1,00 zoo 5300 +2,# 300 5400 +2
25、,50 -O,% - 1,oo -2,oo -29 Thickness Deviation) mm mm 23 56 - 0,075 I 760580 I -0.30 hl 1 I h12 6 510 I-o,w 210 518 -0,ll 18 130 -0.13 I 280 5100 1 -0,35 I h12 ) Ail deviations are +O. increased by 50 %. The tolerances in the table apply to low carbon (C 5 0.20 %) and low carbon freecutting steels on
26、ly. For all other steels, deviation is hl 1 hl 1 hll Table 4 - Deviation from straightness1) 730 150 I -0,16 750 560 I -0J9 Product form hl 1 hl 1 Steel group Nominal dimension Deviation ma. mm Rounds O BSI 12-1999 25 mm: the percentage is 10 %maximum, with the same restriction on the minimum length
27、. If speciallv stated at the time of enquiry and order, the bundles are delivered without any short bars. o BSI 12-1999 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesSTDWBSI BS EN 10278-ENGL 1777 lbZLibb7 O81b88i 830 D Page 7 EN 102781999 Annex A (normative
28、) Supplementary or special requirements NOTE One or more of the following supplementary or special requirements may be wed upon at the time of enquiry and order (see 4.2). The details of these requirements may be agreed upon between the manufacturer and the purchaser at the time of enquuy and order
29、if necessary. A.1 Disposition of tolerances The disposition of tolerances about the nominal dimension of the product other than specified in 6.1.1 shall be one of the following as specified by the purchaser at the time of enquiry and order: a) values all posiive, i.e. + and lower tolerances ali zero
30、, Le. -0 b) values equally disposed about the nominal chension. A.2 End condition The ends of the product shall be as specified by the purchaser at the time of enquiry and order, e.g. chamfering, facing. Annex B (normative) Methods for evaluating straightness B.O Scope This annex sets out two method
31、s for the evaluation of the straghtness of bright steel bars as provided for in 6.4. The method set out in B.1 is the preferred method and B.2 is an alternative method. The choice of method shali be as agreed at the time of enquiry and order. B.l Preferred method B.l.l The bar shaii be supported on
32、a suitable surface so as to eliminate or minimize sagging. B.1.2 A 1 m long straight edge shall be placed on the surface of the bar at any position dong its length. No part of the straight edge shall be wih 150 mm of the ends of the bar. B.1.3 Stsaightness shall be determine by measunng the maximum
33、gap between the bar and the straight edge by suitable means, e.g. feeler gauge. The bar shall be deemed straight where the maximum gap does not exceed the values specified in Table 4. B.2 Alternative method for round bars B.2.1 The round bar shall be supported on a sufficient number of centres place
34、d 1 m apart. B.2.2 Stmightness shall be measured by means of a suitable dial or indicator gauge placed at any position between the supporting centres. B.2.3 The bar shall be deemed to be straight when rotating the bar through 360“ the indicated reading (TiR) is not greater than twice the deviation s
35、pecified in Table 4. O BSI 12-1999 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesBS EN 102781999 BSI 389 Chiswick High Road London w4 4AL STD*BSI BS EN 10278-ENGL 1777 Lb2Ybb7 OBLb885 777 = BSI - British Standards Institution BSI is the independent national
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