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1、J IS JAPANESE I N DUSTR IAL STANDARD Translated and Published by Japanese Standards Association Carbon steels for machine structural use ICs 77.140.10; 77.140.20; 77.140.45 Reference number : JIS G 4051 : 2005 (E) PROTECTED BY COPYRIGHT I l s G 4051 : 2005 Foreword This translation has been made bas
2、ed on the original Japanese Industrial Standard revised 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 Japan Iron and Steel Federation (JISF)
3、with the draft being attached, based on the provision of Article 12 Clause 1 of the Industrial Standardization Law applicable to the case of revision by the provision of Article 14. Consequently JIS G 4051 : 1979 is replaced with this Standard. This revision has been made based on IS0 683-1 : 1987 H
4、eat-treatable steels, alloy steels and free-cutting steels-Part 1: Direct-hardening unalloyed and low-alloyed wrought steel in form of different black products and IS0 683- 11 : 1987 Heat-treatable steels, alloy steels and free-cutting steels-Part I l : Wrought case-hardening steels for the purposes
5、 of making it easier to compare this Standard with International Standards; to prepare Japanese Industrial Standard conforming with International Standards; and to propose a draft of an International Standard which is based on Japanese Industrial Standard. Attention is drawn to the possibility that
6、some parts of this Standard may conflict with 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 Stan
7、dards Committee are not respon- sible for identifying 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: 1965-07-01 D
8、ate of Revision: 2005-08-20 Date of Public Notice in Official Gazette: 2005-08-22 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Iron and Steel JIS G 4051 : 2005, First English edition published in 2005-11 Translated and published by: Japanese Standar
9、ds Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or
10、by any means, electronic or mechanical, including photocopying aiid microfilm, without permission in writing from the publisher, Printed in Japan KA/AT PROTECTED BY COPYRIGHT G 4051 : 2005 Contents Page 1 1 1 2 2 2 3 3 7 8 8 9 9 9 9 10 10 11 Introduction . 1 2 3 4 5 6 6.1 6.2 6.3 6.4 7 8 8.1 8.2 9 1
11、0 Scope Normative references Grade and designation . Method of manufacture Chemical composition . Appearance and shape, dimensions and its tolerance Hot rolled steel bar and wire rod . Hot rolled plate, sheet and strip Hot rolled flat steel . Other steel products Test Inspection Inspection Other ins
12、pections . Marking . Report Annex (informative) Comparison table between JIS and corresponding International Standards . (i PROTECTED BY COPYRIGHT JAPANESE INDUSTRIAL STANDARD JIS G 4051 : 2005 Carbon steels for machine structural use Introduction This Japanese Industrial Standard has been prepared
13、based on the first editions of IS0 683-1 Heat-treatable steels, alloy steels und free-cutting steels- Part 1: Direct-hardening unalloyed and low-alloyed wrought steel in form of differ- ent black products and IS0 683-1 1 Heat-treatable steels, alloy steels and free-cutting steels-Part 11: Wrought ca
14、se-hardening steels published in 1987 with some modifi- cations of the technical contents. The portions given sidelines are the matters modified from the original Interna- tional Standard. A list of modifications with the explanations is given in annex (in- formative). 1 This Standard specifies carb
15、on steels for machine structural use manu- factured by hot forming, such as hot rolling or hot forging, ordinarily to be used after further process of forging, cutting and heat treatment (hereafter referred to as “steel”). Scope Remarks : The International Standards corresponding to this Standard ar
16、e as follows. In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) ac- cording to ISO/IEC Guide 21. IS0 683-1 1 1987 Heat-treatable steels, alloy steels and fre
17、e-cutting steels-Part 1: Direct-hardening unalloyed and low- alloyed wrought steel in form of different black prod- ucts (MOD) IS0 683-1 1 : 1987 Heat-treatable steels, alloy steels and free-cutting steels-Part 11: Wrought case-hardening steels (MOD) 2 Normative references The following standards co
18、ntain provisions which, through reference in this text, constitute provisions of this Standard. The most recent edi- tions of the standards (including amendments) indicated below shall be applied. JIS G 0320 Standard test methods for heat analysis of steel products JIS G 0321 Product analysis and it
19、s tolerance for wrought steel JIS G 0404 Steel and steel products-General technical delivery requirements JIS G 0415 Steel and steel products-Inspection documents JIS G 0551 Methods of austenite grain size determination for steel JIS G 0553 Macrostructure detecting method for steel JIS G 0555 Micros
20、copic testing method for the non-metallic inclusions in steel JIS G 0556 Method of macro-streak-flaw test for steel JIS G 0558 Methods of measuring decarburized depth for steel PROTECTED BY COPYRIGHT -,-,- 2 G 4051 : 2005 JIS G 0561 JIS G 0565 JIS G O901 JIS G 3191 JIS G 3192 JIS G 3193 JIS G 3194 J
21、IS Z 2201 JIS Z 2241 JIS Z 2242 JIS Z 2243 JIS Z 2245 JIS Z 2344 3 Gradeand Method of hardenability test for steel (End quenching method) Method for magnetic particle testing of ferromagnetic materials and classification of magnetic particle indication Classification of structural rolled steel plate
22、 and wide flat for build- ing by ultrasonic test Dimensions, mass and permissible variations of hot rolled steel bars and bar in coil Dimensions, mass and permissible variations of hot rolled steel sec- tions Dimensions, mass and permissible variations of hot rolled steel plates, sheets and strip Di
23、mensions, mass and permissible variations of hot rolled flat steel Test pieces for tensile test for metallic materials Method of tensile test for metallic materials Method of impact test for metallic materials Brinell hardness test-Test method Rockwell hardness test-Test method General rule of ultra
24、sonic testing of metals by pulse echo technique designation The steel shall be classified in 23 grades and the re- spective designation shall be as given in table 1. 3 grades, namely S 09C K, S 15C K and S 20C K, however, are used for case-hardening purposes. 4 Method of manufacture 4.1 The steel sh
25、all be manufactured from killed steel ingot. 4.2 The steel shall be rolled or forged from steel ingot with forging ratio of not less than 4s. The forging ratio of the billet for forging or rolling may be less than 4S, provided that a prior agreement between the purchaser and the manufacturer has bee
26、n acquired. 4.3 Unless otherwise specified, the steel shall be as rolled or forged. 5 Chemical composition The chemical composition of the steel shall be deter- mined by the test in clause 7 and the ladle analysis value shall be as given in table 1. PROTECTED BY COPYRIGHT -,-,- 3 G 4051 : 2005 Table
27、 1 Chemical composition Unit: % Designation of grade s 1oc s 12C S 15C S 17C s 20c s 22c S 25C S 28C S 30C s 33c s 35c S 38C S 40C s 43C s 45c S 48C S 50C s 53c s 55C S 58C S 09C K S 15C K S 20C K C 0.08 to 0.13 0.10 to 0.15 0.13 to 0.18 0.15 to 0.20 0.18 to 0.23 0.20 to 0.25 0.22 to 0.28 0.25 to 0.
28、31 0.27 to 0.33 0.30 to 0.36 0.32 to 0.38 0.35 to 0.41 0.37 to 0.43 0.40 to 0.46 0.42 to 0.48 0.45 to 0.51 0.47 to 0.53 0.50 to 0.56 0.52 to 0.58 0.55 to 0.61 0.07 to 0.12 0.13 to 0.18 0.18 to 0.23 Si 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to
29、0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.15 to 0.35 0.10 to 0.35 0.15 to 0.35 0.15 to 0.35 Mn 0.30 to 0.60 0.30 to 0.60 0.30 to 0.60 0.30 to 0.60 0.30 to 0.60 0.30 to 0.60 0.30 to 0.60 0.60 t
30、o 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.60 to 0.90 0.30 to 0.60 0.30 to 0.60 0.30 to 0.60 P 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 ma
31、x. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.025 max. 0.025 max. 0.025 max. S 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max
32、. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.030 max. 0.025 max. 0.025 max. 0.025 max. Remarks 1 Cr shall not over 0.20 %. However, it can be specified as values under 0.30 % under the agreement be- tween the manufacturer and the purchaser. 2 As impurities, Cu, Ni, Cr and Ni
33、 + Cr for glades S 09C K, S 15C K, S 20C K shall not exceed respectively 0.25 %, 0.20 %, 0.20 % and 0.30 %, and Cu, Ni, Cr and Ni + Cr for all other grades shall not exceed respectively 0.30 %, 0.20 %, 0.20 % and 0.35 %. However, the upper limit of Ni + Cr can be specified under 0.40 % for S 09C K,
34、S 15C K and S 20C K , and may be specified under 0.45 % for other grades. 3 When the product analysis on steel is requested by the purchaser, shall be tested by clause 7, and allowable deviation to table 1 shall conform to attached table 3 in JIS G 0321. 6 Appearance and shape, dimensions and its to
35、lerance 6.1 Hot rolled steel bar and wire rod 6.1.1 Appearance The hot rolled steel bar and the wire rod shall be well finished and free from harmful defects to use in appearance. However, for the steels furnished in coil form, the detection of defects for the whole length of materials is difficult
36、and PROTECTED BY COPYRIGHT 4 G 4051 : 2005 Diameter mm there are no chance to remove them, and there may remain those abnormal parts. Therefore? the treatment for the abnormal part shall be under the agreement between the purchaser and the manufacturer. Permissible depth of flaw deducted from the no
37、minal size 6.1.2 Reference of flaw dressing and permissible depth of remaining flaws 50 or over to and excl. 100 100 or over Steel bar for general forging The flaw dressing of the steel bar for general forging shall be made smoothly and to the depth not exceeding 4 % of nominal size (5 mm max.) belo
38、w nominal size, and the total width not exceeding 1/4 of the circumferential length of the same section. If the dressed portio is within the dimensional tolerance? however, it shall not be considered as the flaw of the portion dressed. The permissible amount of remaining flaw shall be as agreed upon
39、 between the purchaser and the manufacturer. Round bar for direct cutting Removing of the defects from round bar of direct cut materials are generally not allowed. In the case of removal of de- fects? the reference of flaw dressing shall be in accordance with the agreement between the purchaser and
40、the manufacturer. The permissible depth of flaw on the round bar for direct cutting shall conform to the value given in table 2 deducted from the nominal size. Not exceeding 2 5% of nominal size with the maximum of 1.5 mm Not exceeding 1.5 % of nominal size with the maximum of 3.0 mm Diameter or wid
41、th across flats mm I Under 16 I Not exceeding 4 % of nominal size with the maximum of 0.5 mm I Flaw dressing depth limit from the lowest limit of dimensional tolerance I 16 or over to and excl. 50 I Not exceeding 3 9 6 of nominal size with the maximum of 1.0 mm I 50 or over to and excl. 100 100 or o
42、ver up to and incl. 130 Not exceeding 0.7 Z of nominal size with the maximum of 0.50 mm Not exceeding 0.5 f/c of nominal size Steel bar for cold drawing The flaw dressing of the steel bar for cold draw- ing shall be made smoothly and the flaw dressing depth limit from the lowest limit of dimensional
43、 tolerance shall be as table 3. The permissible amount of remaining flaw shall be as agreed upon between the purchaser and the manu- facturer. Table 3 Flaw dressing depth limit from the lowest limit of dimensional tolerance of steel bars for cold draw (hot rolled steel bar) I Under 16 I 0.15 mm I I
44、16 or over to and excl. 50 I Not exceeding 1 % of nominal size with the maximum of 0.35 mm I PROTECTED BY COPYRIGHT 5 G 4051 : 2005 d) Other steel bars depend upon the agreement between the purchaser and the manufacturer. Wire rod the agreement between the purchaser and the manufacturer. For the oth
45、er steel bars, if necessary to redress, it shall be e For flaw dressing depth limit for the wire rod, it shall depend upon 6.1.3 Standard dimension (round, square, hexagonal) and wire rod shall conform to table 4. The standard dimensions of the hot rolled steel bar Table 4 Standard dimensions of hot
46、 rolled steel bar and wire rod Unit: mm Round bar (diameter) 22 (24) 25 (26) 28 30 32 34 36 38 40 42 85 160 44 90 (170) 46 95 180 48 100 (190) 50 (105) 200 55 110 60 (115) 65 120 70 130 75 140 80 150 Square bar (width across flats) 40 95 200 45 100 50 (105) 55 110 60 (115) 65 120 70 130 75 140 80 15
47、0 85 160 90 180 Hexagonal bar (width across flats) (12) 13 14 17 19 22 24 27 30 32 36 41 46 50 55 60 63 67 71 (75) (77) (81) Wire rod (diameter j 5.5 (15) 6 16 7 (17) 8 (18) 9 19 9.5 (20) (10) 22 11 (24) (12) 25 13 (26) (14) 28 30 32 34 36 38 40 42 44 46 48 50 Remarks : It is desirable to use the fi
48、gures that are not in parentheses. 6.1.4 Shape and dimensional tolerance The shape and dimensional tolerances of the hot rolled steel bar and wire rod shall conform to a) to c) with the exception of hot rolled steel bar and wire rod subjected to heat treatment. a The shape and dimensional tolerances
49、 of the hot rolled round bar and the square bar shall conform to table 5. PROTECTED BY COPYRIGHT -,-,- 6 G 4051 : 2005 Item Tolerances on diameter or width across flats Deviation of diameter or deviation (l) Table 5 Shape and dimensional tolerances of hot rolled round bar and square bar Shape and dimensional tolerance 11.5 % with the minimum value of 0.4 mm. Not exceeding 70 % of range of tolerance on diameter or width across flats. Tolerances on lengt