EN ISO 642-1999 en Steel - Hardenability Test by End Quenching (Jominy Test)《钢 端头淬硬性试验(乔米尼(Jominy)试验)ISO 642-1999》.pdf

《EN ISO 642-1999 en Steel - Hardenability Test by End Quenching (Jominy Test)《钢 端头淬硬性试验(乔米尼(Jominy)试验)ISO 642-1999》.pdf》由会员分享，可在线阅读，更多相关《EN ISO 642-1999 en Steel - Hardenability Test by End Quenching (Jominy Test)《钢 端头淬硬性试验(乔米尼(Jominy)试验)ISO 642-1999》.pdf（27页珍藏版）》请在麦多课文档分享上搜索。

1、- STD-BSI BS EN IS0 b42-ENGL 1799 H Lb24bb7 O10137 07b U BRITISH STANDARD Steel hardenability test by end quenching (Jominy test) The European Standard EN IS0 642: 1999 has the status of a British Standard ICs 77.040.99 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0

2、 642: 1999 BS EN IS0 642:1999 direction of the Engineering Amd.No. Date Sector Committee, was published National foreword Comments This British Standard is the English language version of EN IS0 642:1999. It is identical with IS0 642: 1999. It supersedes BS 4437 1987 which is withdrawn. The UK parti

3、cipation in its preparation was entrusted to Technical Committee ISW2, Methods of Physical and Metallographic Testing, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationalEuropean committee any enquiries on the interpretation, or proposa

4、ls for change, and keep the UK interests informed - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that C,EN and

5、CENELEC Standards normally include an annex which lists normative references to international pubkations with their corresponding European publications. The British Standasds which implement international or European publications referred to in this document may be found in the BSI Standards Catalog

6、ue under the section entitled “International Standards Correspondence Index”, or by using the “Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their corr

7、ect 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 IS0 title page, the EN IS0 foreword page, the IS0 title page, pages ii to iii, and a blank page, pages

8、1 to 18, the annex ZA page, and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Standards Committee and comes into effect on 15 November 1999 O BSI 11-1999 ISBN O 580 35135 1 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 642 S

9、eptember 1999 ICs 77.040.99 English version Steel - Hardenability test by end quenching (Jominy test) (IS0 642: 1 999) Acier - Essai de trempabilit par trempe en bout (essai Jominy) (IS0 642:1999) Sthle - Stirnabschreckversuch (Jominy-Versuch) (IS0 642: 1 999) This European Standard was approved by

10、CEN on 16 August 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standar

11、ds 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 language made by translation under the responsibility of a CEN member into its own language and notified to lh

12、e Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark. Finland, France, Germany, Greece, Iceland, Ireland. Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United

13、Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FUR NORMUNG Central Secretariat: rue de Stassart, 36 8-1050 Brussels Q 1999 CEN All rights of exploitation in any form and by any means reserved worldwide ior CEN national Members. Ref. No. EN IS0 642:

14、1999 E STD-SI S EN IS0 b1iZ-ENGL LlY7 W Lb24bb9 08110012 bBO I EN IS0 642:1999 Foreword The text of the International Standard IS0 642:1999 has been prepared by Technical Committee ISOTTC 17 “Steel“ in collaboration with Technical Committee ECISSTTC 2 “Steel - Physico-chemical and non-destructive te

15、sting“, the secretariat of which is held by AFNOR. 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 March 2000, and conflicting national standards shall be.withdrawn at the latest by March 2000. Ac

16、cording to the CENKENELEC 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, Italy, Luxembourg, Netherlands, Norway, Portug

17、al, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 642:1999 was approved by CEN as a European Standard without any modification. NOTE: Normative references to International Standards are listed in annex ZA (normative). STD-BSI BS EN I

18、S0 h42-ENGI- 1799 M 1b24bb7 01310043 S17 M EN IS0 642:1999 INTERNATIONAL STANDARD IS0 642 Second edition 1999-09-01 Steel - Hardenability test by end quenching (Jominy test) Acier - Essai de trempabilit par trempe en bout (essai Jominy) Reference number IS0 642: 1999(E) Contents Page 1 Scope 1 2 Nor

19、mative references 1 3 Principle 1 4 Symbols and designations . 2 5 Form of test pieces and their preparation . 2 6 Apparatus . 3 7 Heating and quenching of test piece . 6 8 Preparation for. and measurement of. hardness after quenching 6 9 Expression of results 7 1 O Test report 8 Annex A (informativ

20、e) Specification for the hardenability of a product 10 Annex B (informative) Additional information to clause 10 13 Annex C (informative) Calculation of the hardenability . 15 Bibliography 16 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national stan

21、dards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International org

22、anizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given

23、 in the ISOAEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 YO of the member bodies casting a vote. International Standard IS0 642 was pr

24、epared by Technical Committee IS0 /TC 17 Steel, Subcommittee SC 7, Methods of testing (other than mechanical tests and chemical analysis). This second edition cancels and replaces the first edition (IS0 642:1979) which has been technically revised. Annexes A, B, and C of this International Standard

25、are for information only. iii STD-BSI BS EN IS0 b42-ENGL 2777 Lb24bb7 OBLOO4h 22b EN IS0 642:1999 Steel - Hardenability test by end quenching (Jominy test) 1 Scope This International Standard specifies a method for determining the hardenability of steel by end quenching (Jominy test) by using a test

26、 piece 25 mm in diameter and 100 mm long. NOTE By agreement and for a defined field of application, the test described in this International Standard may be replaced by the calculation of the Jominy curve in accordance with an accepted mathematical model (see annex C). In case of dispute, the test s

27、hall be carried out. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this Intemational Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. Howeve

28、r, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IE

29、C maintain registers of currently valid International Standards. IS0 6507-1, Metallic materials - Vickers hardness test - Part 1: Test method. IS0 6508-1, Metallic maferials - Rockwell hardness rest - Part 1: Test method (scales A, B, C, O, E, F, G, H, K, N, T). IS0 6508-2, Metallic materials - Rock

30、well hardness test) - Part 2: Verification and calibration of testing machines (scales A, 8, C, O, E, F, G, H, K, N, T). IS0 6508-3, Metallic materials - ockwell hardness test - Part 3: Calibration of reference blocks (scales A, B, C, 0, E, F, G, H, K, N, T). 3 Principle The test consists of: a) hea

31、ting a cylindrical test piece to a specified temperature in the austenitic range for a specified period of time; b) quenching it by spraying water on one of its ends under specified conditions; c) measuring the hardness at certain given points, on longitudinal flats made on the test piece, in order

32、to determine the hardenability of the steel by variations of this hardness. 1 STD.BSI BS EN IS0 b42-ENGL 1779 1b24bb 0810047 1b; W Symbol Designation L Total length of test piece EN IS0 642:1999 Value (1 O0 I 0,5) mm 4 Symbols and designations t trn T Time during which test piece is maintained at he

33、ating temperature (30 +E) min 5s Maximum time lag between removal of test piece from furnace and start Temperature of cooling water of quenching (20 I 5) “C 1 D Diameter of test piece a h 1 e d Jxr-d JHVxx-d 1 (25 25)mm Internal diameter of vertical water supply pipe Height of water jet without test

34、 piece in position Distance from end of water supply pipe to lower end of test piece Depth of flats for measurement of hardness Distance, in millimetres, from quenched end to points where hardness is measured Jominy hardenability index at distance d, in Rockwell HRC-mm Jominy hardenability index at

35、distance d, in Vickers HV 30-mm (1 23 -t- 0,5) mm (65 $r 10) mm (1 2,5 k 0,5) mm (0,4 to 0,5) mm 5 Form of test pieces and their preparation 5.1 Sampling In the absence of specific requirements in the product standard, and unless otherwise agreed on the order and regardless of the thickness (or diam

36、eter) of the product, the sampling of test piece from the product can be made: - either by hot rolling or forging of test piece with 30 mm to 32 mm diameter; + 0,5 - or by machining of test piece with diameter ( 25 o ) mm whose axis shall be at least at (20 +i) mm from the surface product (see Figur

37、e 1). In case of products from continubus casting, a minimum reduction ratio 8:l is recommended before sampling. In all the forming processes preceding the machining of the test piece, the deformation of the product from all sides should be as uniform as possible. In the case of a separately cast re

38、ference test piece, the original cross section before deformation must be at least three times that corresponding to the required diameter of 30 mm to 32 mm. By special agreement, the test piece can be obtained by a suitable casting process and tested in the as-cast condition. The flats of the test

39、piece shall have their axes at approximately the same distance from the product surface (see Figure 1). For this purpose, the test piece shall be marked so that its position in the round bar can be clearly recognized. 2 STD-BSI BS EN IS0 bY2-ENGL 1999 9 Lb24bb9 OBL0018 UT9 EN IS0 642:1999 5.2 Dimens

40、ions 5.2.1 The test piece shall consist of a round bar machined to a diameter of 25 rnm and a length of 100 mm. 5.2.2 The end of the test piece which will not be quenched shall be 30 mrn to 32 mrn or 25 mm in diameter, depending upon the form of that end. Two examples, test pieces with a flange or a

41、n undercut (to permit rapid centring and fitting in position for the quenching operation by means of an appropriate support) are shown in Figure 2. 5.2.3 The test piece shall, if necessary, be marked (on the end opposite to the end to be quenched) to enable its position to be identified in relation

42、to the original product. 5.3 Heat treatment Unless otherwise agreed, the test piece shall be normalized before machining and quenching. The normalizing process shall be carried out at the average temperature within the range specified in the material standard. If the material standard does not speci

43、fy a temperature for normalizing, the normalizing temperature shall be subject to special agreement or duly selected by the testing department. The holding time at normalizing temperature shall be (30 05) min. The heat treatment shall be carried out in each case in such a way that the finish-machine

44、d test piece shows absolutely no traces of decarburization. 5.4 Machining The cylindrical surface of the test piece shall be machined by fine turning; the surface of the test piece end to be quenched shall have a reasonably fine finish, preferably obtained by fine grinding, and should be free from b

45、urrs (see Figure 2). 6 Apparatus The apparatus consists of a device for quenching the test piece. 6.1 The quenching device consists essentially of a means of suddenly inducing the water jet to impinge on the end of the test piece to be quenched. This can be realized e-g., by a quick action tap and a

46、 system to adjust the flow rate of the water or a disc allowing the water jet to be released and cut off rapidly (see Figure 3). In the case of a quick action tap the length of the water supply pipe behind the tap shall be at least 50 rnm in order to ensure non- turbulent water flow. 6.2 The relativ

47、e positions of the end of the water supply pipe and the test piece support shall be such that the distance beween the end of the water supply pipe and the test piece end to be quenched is (12,5 f 0,5) mm (see Figure 3). 6.3 The test piece support shall allow precise centring of the test piece above

48、the end of the water supply pipe and the holding of it in position during spraying. It shall be dry while the test piece is being placed in position; the test piece shall be protected from water splashes while it is being placed in position as well as before and during the actual end quenching opera

49、tion. 6.4 lhe height of the water jet above the end of the water supply pipe without the test piece in position shall be (65 I10) mm (see Figure 4). The water temperature in the pipe shall be (20 f 5) OC. In the case of comparative tests, tests shall be carried out with the same water temperature. 6.5 The test piece shall be protected from draughts throughout the heating and quenching. STD-BSI BS EN IS0 b42-ENGL 1999 Lb2Libb3 0830047 T35 W - - I - I EN IS0 642:1999 Dimensions in millimetres 1 + Key 1 Test flats. Figure 1 - Sampling by machining of th