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1、J IS JAPANESE INDUSTRIAL STANDARD Translated and Published by JaDanese Standards Association Process of induction hardening and tempering of iron and steel ICs 25.200; 77.140.01 Reference number : JIS B 6912 : 2002 (E) PROTECTED BY COPYRIGHT 10 s Copyright Japanese Standards Association Provided by
2、IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:50:43 MDTNo reproduction or networking permitted without license from IHS -,-,- B 6912 : 2002 Foreword This translation has been made based on the original Japanese Industrial Standard revise
3、d by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial Standard submitted by the Heat Treatment Trade Association of Japan (HTTAJ)/the Japanese Standards Association (JSA) wi
4、th the draft being attached, based on the provision of Article 12 Clause 1 of the Industrial Standardization Law. Consequently JIS B 6912 : 1996 is replaced with this Standard. In this revision, the material for processing, types of processing, and so on have been revised, and newly the types and sy
5、mbol of processing, environmental protection to the heat treatment oil and so on, and Annex (normative) : History of sintered ferritic material, and quality and test method of processed goods have been provided, Attention is drawn to the possibility that some parts of this Standard may conflict with
6、 a patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for ident
7、ifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the said technical properties. Date of Establishment: 1968-03-01 Date of Revision: 2002-01-20 Date of Public Noti
8、ce in Official Gazette: 2002-01-21 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Iron and Steel JIS B 6912 : 2002, First English edition published in 2002-10 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Toky
9、o, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JCA 2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, includi
10、ng photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:50:43 MDTNo repro
11、duction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS E 6912.: 2002 Process of induction hardening and tempering of iron and steel 1 Scope This Japanese Industrial Standard specifies the process of induction hardening and tempering or of induction hardening
12、of iron and steel (hereafter re- ferred to as “proessing). 2 Normative references The standards listed in Attached Table 1 contain pro- visions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including amendments) shall be
13、 applied. 3 Definitions 6905 and the following definitions shall apply. For the purposes of this Standard, the definitions given in JIS B induction hardening and tempering A treatment which, in order to harden the whole or a part of surfaces of iron and steel products, is to heat up to an appropriat
14、e temperature higher than Ac3 or Ac1 by induction heating, and to cool with an appropriate quenchant (quenching), furthermore, in order to ad- just the hardness and to increase toughness, to heat in a usual tempering fur- nace at an appropriate temperature below Aci, then to cool (tempering). The te
15、mpering process involves the induction tempering. material for processing The parts and materials which become the object of processing. The parts are almost or nearly finished iron and steel products that are machines, tools, jigs, equipment or their parts, while the materials are iron and steel an
16、d their semi-finished products made by rolling, casting, forging, etc. processed goods The material for processing having been processed accord- ing to this Standard. distortion The deviation in shape or dimension for the processed goods from that of the material for processing. The distortion in th
17、e direction at a right angle to the longitudinal direction of goods is called “bend”. The deviation shall be expressed as the maximum value in each direction. single body A unit or lot of processed goods. 4 Type and symbol of processing The type and symbol of processing shall be as Table 1 according
18、 to the methods of processing. Table 1 Type and symbol of processing Type of processing Symbol (I) Induction hardening and tempering (2 ) HQI-HT Induction hardening Notes (1) Symbols shall be based on JIS B 0122. (2) This means ordinary tempering by a tempering furnace. PROTECTED BY COPYRIGHT Copyri
19、ght Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:50:43 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 3 6912 : 2002 5 Material for processing 5.1 Grade of material
20、for processing The grade of material for processing shall conform to Table 2, or the quality of the processed goods shall conform to the re- quirements specified in 8 of this text and 5 of Annex. Table 2 Grade of material for processing Standard number a) Carbon and alloy steels for machine structur
21、al use JIS G 4051 JIS G 4052 JIS G 4102 JIS G 4103 JIS G 4104 JIS G 4105 JIS G 4106 b) Steels for special use JIS G 4303 JIS G 4311 JIS G 4401 JIS G 4404 JIS G 4410 JIS G 4801 JIS G 4805 c) Iron and steel castings and forgings JIS G 3201 JIS G 5101 JIS G 5111 JIS G 5121 JIS G 5501 JIS G 5502 JIS G 5
22、704 d) Sintered metal materials for the use of machine structural parts JIS Z 2550 Symbol of grade S20C, S22C, S25C, S28C, S30C, S33C, S35C, S38C, S40C, S43C, S45C, S48C, S50C, S53C, S55C, S58C SMn433H, SMn438H, SMn443H SMnC443H SCr430H, SCr435H, SCr440H SCM435H, SCM440H, SCM445H SNC631H SNC236, SNC
23、631, SNC836 SNCM240, SNCM431, SNCM439, SNCM447, SNCM625, SNCM630 SCr430, SCr435, SCr440, SCr445 SCM430, SCM432, SCM435, SCM440, SCM445 SMn433, SMn438, SMn443 SMnC443 SUS403, SUS42OJ1, SUS42OJ2 SUH1, SUH3, SUH4 SK1, SK2, SK3, SK4, SK5, SK6, SK7 SKS2, SKS5, SKS51, SKS4, SKS41, SKS43, SKS44, SKS3, SKS3
24、1 SKC3, SKC11, SKC24, SKC31 SUPS, SUP6, SUP7, SUPS, SUPSA, SUP10, SUP11A SUJ1, SUJZ, SUJ3, SUJ4, SUJ5 SF440A, SF490A, SF540A, SF590A, SF540B, SF590B, SF640B SC410, SC450, SC480 scc3, scc5 SCMnl, SCMn2, SCMn3, SCMn5 SCSiMn2 SCMnCr2, SCMnCr3, SCMnCr4 SCMnM3 SCCrM1, SCCrM3 SCMnCrM2, SCMnCrM3 SCNCrM2 s
25、c s 2 FC200, FC250, FC300, FC350 FCD400, FCD450, FCD500, FCDGOO, FCD700, FCD800 FCMP440, FCMP490, FCMP540, FCMP590, FCMP690 SMF4030, SMF4040, SMF5030 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Be
26、rnie Not for Resale, 03/15/2007 07:50:43 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 B 6912 : 2002 5.2 for processing, the items given in Table 3 shall have been made clearly. History of material for processing With respect to history of the material Table 3 History o
27、f material for processing Item i) Material testing results of material for processing Grade of iron and steel Chemical composition (3) Heat number (3) Tensile test result (3) Hardness test result (3) Hardenability test result (3) Metallographic test result (3) Density test result of sintered metalli
28、c materials (3) 3) Category of method of manufacture of material for processing Casting Sintering (4) Forging Rolling Extrusion Press working Drawing Form rolling Press fitting Shrink fitting Welding Machining c j Whether applying preheat treatment or not and category of treatment method of material
29、 for processing Normalizing Direct quenching from forging Full annealing Spheroidizing Stress relieving Quenching and tempering Carburizing (5) Nitrocarburizing (9 d) Surface finish conditions of material for processing, and whether applying rectification or not and its degree (9 Cutting method and
30、its conditions Whether applying rectification or not, and its degree Remarks Grain size, decarburized layer, nonmetallic inclusion, micro- and macro-structure. Includes discrimination of hot and cold working. Includes discrimination of hot and cold working. Includes discrimination of hot and cold wo
31、rking. Includes discrimination of hot and cold working. Includes discrimination of hot and cold working. Includes discrimination of hot and cold working. Includes discrimination of hot and cold working. Includes rectification by overlaying. Heating temperature, holding time and cooling method shall
32、be made clear, as necessary. Includes discrimination of hot and cold working. Votes (3) (4) It may be omitted when this will not interfere the processing. Sintered ferritic material shall be in accordance with Annex (normative). PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provide
33、d by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:50:43 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 B 6912 : 2002 (5) It includes quenching and tempering with carburizing and quenching and tempering with
34、carburizing and nitrocarburizing. 5.3 Appearance, shape and dimensions of material for processing With respect to the appearance, shape and dimensions of the material for processing, the items given in Table 4 shall have been made clear. Table 4 Appearance, shape and dimensions of material for proce
35、ssing Item a) Appearance of material for processing b) Mass of material for proessing() c) Shape of material for proessing() Peculiar shape Unevenness of thickness Shape and location of hole d) Dimensions and precisions of material for processing (3) Dimensions Machining area Whole machining allowan
36、ce Surface roughness processed part Dimensional precision Shape deviation Orientational deviation Positional deviation e) Finishing by grit blasting of material for processing Sand blasting Shot blasting fl Kind of rust preventive Remarks Cracks, flaws, rust, scale, or the like (Information) Shape d
37、eviation means straightness, flatness, circularity, cylindricity and profile of any line and surface. (Information) Orientational deviation means parallelism, perpendicularity and angularity. (Information) Positional deviation means divergency in positioning, coaxiality, concentricity and symmetrici
38、ty. Note (6) Each definition of deviations shall conform to JIS B 0621. 5.4 Verifying material for processing With respect to acceptance of the mate- rial for processing, the items which are necessary for processing specified in 5.1 to 5 . 3 , shall be identified between purchaser and supplier. If n
39、ecessary, quality of the material for processing shall be made clear by the methods specified in JIS G 0565, JIS G 0566 and JIS 2 2343 or other appropriate methods. 6 Processing equipment 6.1 Induction heating equipment The induction heating equipment used for induction hardening shall be as given i
40、n the following: PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:50:43 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 B 6912 : 2002 Ty
41、pe of high frequency generating equipment Motor generator type, vacuum tube type, etc. a) The equipment for generating high frequency shall, irrespective of its type, such as motor-generator type, vacuum tube type, thyristor type or transistor type, be able to generate the output and frequency appro
42、priate for heating purpose in ordinary working condition, and have a control device at either output side or input side. And the variation on the set voltage or electric power shall be within the precision given in Table 5 in stationary state. The equipment shall have a time limiting device(? which
43、can control heating time, and the overall precision of the device shall be maintained or adjusted within the value given in Table 6. Note (7) A time limiting device means a whole mechanism containing timer, switch, etc. The efficiency of induction heating equipment shall be preferably high. b) Infor
44、mative reference : Precision Voltage Power I+ 2.5 +i5 Table 5 Precision of high frequency generating equipment Unit: % 1 or under Over 1 0.1 0.15 I Thyristor type and transistor type I +2 j i4 I Table 6 Overall precision of time limiting device Unit: s I Range of time I Overall precision I 6.2 a) Co
45、oling apparatus The cooling apparatus shall be as given in the following: The kind of quenchant shall be water, heat-treatment oil(8), water solution quench- ing media, etc. according to the type, shape and dimensions of the material for processing, and each cooling system shall be capable of holdin
46、g the tempera- ture of the quenchant within the tolerance of holding temperature specified in Table 7 and supplying the necessary quantity for quenching. Note (8) The heat-treatment oil shall be No. 1 or No. 2 of class 1 specified in JIS K 2242, or at least equivalent in quality. PROTECTED BY COPYRI
47、GHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 07:50:43 MDTNo reproduction or networking permitted without license from IHS -,-,- 6 B 6912 : 2002 Run-out of surface (9) Range of variat
48、ion of moving speed (mds) (lo) Table 7 Tolerance of holding temperature for quenchant Unit: “C 0.3 mm + 5 % b) The pressure and flow rate of the quenchant shall be adjusted not to cause re- markable difference in cooling of the material for processing in ordinary work- ing conditions. In the case of immersion cooling, the apparatus shall have a device capable of stirring the quenchant with an appropriate velocity of flow. The cooling apparatus shall have a time limiting device to control given cooling time, and shall be able to start cooling immediately after the operation of rel