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1、JIS JAPANESE I NDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Boron steels for cold heading - Part 1: Wire rods ICs 77.140.10; 77.140.65 Reference number : JIS G 3508-1 : 2005 (E) PROTECTED BY COPYRIGHT 16 S G 3508-1 : 2005 Foreword This translation has been made based
2、 on the original Japanese Industrial Standard established by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee as the result of proposal of establishing a Japanese Industrial Standard from The Japan Iron and Steel Federation (JISF), with
3、 a draft being attached, based on the provision of Article 12 Clause 1 of the Industrial Standardization Law. Consequently JIS G 3508:1991 is replaced with this Standard. Attention is drawn to the possibility that some parts of this Standard may conflict with a patent right, application for a patent
4、 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 identifying the patent right, application for
5、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. This Standard has been made based on IS0 4954:1993 Steels for cold heading and cold extruding for the purposes of making it
6、 easier to compare this Standard with International Standard; to prepare Japanese Industrial Standard conforming with International Standard; and to propose a draft of an International Standard which is based on Japanese Industrial Standard. JIS G 3508 consists of the following parts under the gener
7、al title ?Boron steels for cold heading?: Part 1: Wire rods Part 2: Wires Date of Establishment: 2005-01-20 Date of Public Notice in Official Gazette: 2005-01-20 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Iron and Steel JIS G 3508-1 :2005, First E
8、nglish edition published in 2005-05 Translated and published by: Japanese Standards 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. No part of this publ
9、ication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan T H / HB PROTECTED BY COPYRIGHT -,-,- G 3508-1 : 2005 Contents Page Introduction . 1 Scope 2 Normative
10、 references 3 Symbol of steel grade . 4 Manufacturing method . 5 Chemical composition . 6 Physical properties 6.2 Hardenability . 6.1 Decarburized depth . 6.3 Austenitic grain size and non-metallic inclusion 7 Appearance, shape, dimensions and tolerance thereon . 7.1 Appearance . 7.2 Standard dimens
11、ions 7.3 Shape and tolerance on dimensions . 8 Tests 8.1 Chemical analysis 8.2 Metallographic test . 8.3 Surface flaw detection test 9 Inspection . 10 Marking 11 Report . Annex 1 (normative) Special quality specification Annex 2 (informative) Boron steels for cold heading without data 1 1 1 1 1 1 2
12、2 2 3 3 3 3 4 4 4 4 5 5 5 6 19 of hardenability 20 Comparison table between JIS and corresponding International Standard . 21 Annex 3 (informative) (i PROTECTED BY COPYRIGHT -,-,- JAPANESE INDUSTRIAL STANDARD JIS G 3508-1 : 2005 Symbol of steel grade Boron steels for cold heading - Part 1: Wire rods
13、 Symbol of steel grade Symbol of steel grade Introduction This Japanese Industrial Standard has been prepared based on the second edition of IS0 4954 Steels for cold heading and cold extruding published in 1993 with some modifications of the technical contents. Portions given sidelines or dotted und
14、erlines are the matters in which the contents of the original International Standard have been modified. A list of modifications with the explanations is given in annex 3 (informative). Symbol of steel grade 1 This part of JIS G 3508 specifies the boron steel wire rods (hereafter referred to as the
15、“wire rods”) to be used mainly for manufacture of the boron steel wires for cold heading. Scope Symbol of steel grade Symbol of steel grade Remarks : The International Standard corresponding to this part of JIS G 3508 In addition, symbols which denote the degree of correspondence in the contents bet
16、ween the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21. IS0 4954:1993 Steels for cold heading und cold extruding (MOD) is as follows. SWRCHB 223 SWRCHB 237 SWRCHB 320 SWRCHB 323 2 Normative references The standards
17、 listed in attached table 1 contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including the amendments) shall be applied. SWRCHB 331 SWRCHB 620 SWRCHB 334 SWRCHB 623 SWRCHB 420 SWRCHB 726 SWRCHB 526 SWRCHB
18、 734 3 their symbols shall be as given in table 1. Symbol of steel grade The wire rods shall be classified into 12 grades and . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SWRCHB 223 SWRCHB 237 SWRCHB 320 SWRCHB 323 SWRCHB 331 SWRCHB 620 SW
19、RCHB 334 SWRCHB 623 SWRCHB 420 SWRCHB 726 SWRCHB 526 SWRCHB 734 4 Manufacturing method The manufacturing method shall be as follows. a) b) Wire rods shall be manufactured by hot rolling from killed steel. Wire rods shall be rolled by forging ratio of 4s or over from steel ingot (including cast metal
20、 manufactured by continuous casting). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Chemical composition The wire rods shall be tested in accordance with 8.1 and their ladle analysis values shall be as given in table 2. . PROTECTED BY COPYRIGHT 2 G 3508-1 : 2005 SWRCHB 320 SWRCHB 323 Table 2 C
22、hemical composition 0.17 to 0.23 0.10 to 0.35 0.70 to 1.00 0.030 max. 0.030 max. 0.000 8 min. 0.20 to 0.26 0.10 to 0.35 0.70 to 1.00 0.030 max. 0.030 max. 0.000 8 min. Unit: % SWRCHB 526 SWRCHB 620 Symbolof I C 1 Si 1 Mn 1 P 1 S I B steel grade 0.23 to 0.29 0.10 to 0.35 0.90 to 1.20 0.030 max. 0.030
23、 max. 0.000 8 min. 0.17 to 0.23 0.10 to 0.35 1.10 to 1.40 0.030 max. 0.030 max. 0.000 8 min. SWRCHB 223 I 0.20 to 0.26 I 0.10 to 0.35 I 0.60 to 0.90 I 0.030 max. I 0.030 max. IO.000 8 min. Diameter 15 or under Over 15 up to and incl. 25 Over 25 up to and incl. 32 SWRCHB 237 I 0.34 to 0.40 I 0.10 to
24、0.35 I 0.60 to 0.90 I 0.030 max. I 0.030 Max. IO.000 8 min. Ferrite decarburized depth Total decarburized depth 0.02 Max. 0.15 max. 0.03 max. 0.20 max. 0.04 max. 0.25 max. SWRCHB 331 I 0.28 to 0.34 I 0.10 to 0.35 I 0.70 to 1.00 I 0.030 max. I 0.030 max. IO.000 8 min. SWRCHB 334 10.31 to 0.37 I 0.10
25、to 0.35 I 0.70 to 1.00 I 0.030 max. I 0.030 max. IO.000 8 min. SWRCHB 420 I 0.17 to 0.23 I 0.10 to 0.35 I 0.80 to 1.10 I 0.030 max. I 0.030 Max. IO.000 8 min. SWRCHB 623 10.20 to 0.26 I 0.10 to 0.35 I 1.10 to 1.40 I 0.030 max. I 0.030 max. IO.000 8 min. SWRCHB 726 I 0.23 to 0.29 I 0.10 to 0.35 I 1.2
26、0 to 1.50 I 0.030 max. I 0.030 max. IO.000 8 min. SWRCHB 734 10.31 to 0.37 I 0.10 to 0.35 I 1.20 to 1.50 I 0.030 max. I 0.030 max. IO.000 8 min. Remarks 1 A silicon content of under 0.10 % may be as agreed upon between the purchaser and the supplier. . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _ 3 A chromium content shall not exceed 0.20 %. Further, the impurities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . shall not exceed 0.30 % in Cu and 0.20 % in Ni. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Physical prop
29、erties 6.1 Decarburized depth When specified by the purchaser, the decaburized depth test shall be carried out in accordance with 8.2.1, and the average decarburized depth shall be in conformity with table 3. For the wire rods exceeding 32 mm in diameter, however, it shall be agreed between the purc
30、haser and the supplier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 Hardenability a) When specified by the purchaser, the test shall be carried out in accordance with 8.2.2, an
31、d the values obtained shall be as shown in tables 6 to 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PROTECTED BY COPYRIGHT -,-,- 3 G 3508-1 2005 bj The method for specifying hardenability shall be based from the hardness between the lowest and
33、 the highest of a specific distance. Example: J 7mm = 31 / 44 at the points A-A as shown in figure 1. . Distance from hardened end (mm) Figure 1 Method of specifying hardenability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
34、. . . . . . . . . 6 . 3 Austenitic grain size and non-metallic inclusion The purchaser may specify austenitic grain size and non-metallic inclusion or either of them. In this case, the examinations specified in 8 . 2 . 3 and/or 8 . 2 . 4 shall be made, and the specified values shall be agreed betwee
35、n the purchaser and the supplier. 7 Appearance, shape, dimensions and tolerances thereon 7 . 1 Appearance and b). The appearance of wire rods shall conform to the following a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . aj bj Wire rods shall be smooth on the surface and free from flaws detrimental to use other than those allowed in b). Surface flaws of wire rods shall be tested by 8 . 3 and
37、the flaw depth shall be 0.10 mm or under. If the depth is requested to be especially controlled, class A in annex 1 table 1 may be specified subjected to the agreement between the purchaser and the supplier on 25 mm or under in the diameter of wire rods. . . . . . . . . . . . . . . . . . . . . . . .
38、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40、 . . . . . . . . . . . . . 7 . 2 Standard dimensions given in table 4. The standard diameter of the wire rods shall be as . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
41、. . . . . . . . . . . . . . . . . . . . . . . . . . PROTECTED BY COPYRIGHT -,-,- 4 G 3508-1 : 2005 Diameter 15 or under Over 15 up to and incl. 25 Over 25 up to and incl. 32 Over 32 up to and incl. 50 5.5, 6, 6.4, 7, 8, 9, 9.5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 26, 28, 30, 32,
42、34, 36, 38, 40, 42, 44, 46, 48, 50 Tolerance Ovality f0.3 0.4 max. f 0.4 0.5 max. f 0.5 0.6 max. f 0.6 0.7 max. 7.3 of the wire rod shall be as follows: Shape and tolerance on dimensions The tolerance on diameter and ovality() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
43、 . . . . . . Table 5 Tolerances on diameter and ovality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unit: mm 8 8.1 8.1.1 General requirements for chemical analysis and sampling method The general requirements
44、 for chemical analysis and the sampling method of specimen 8.1.2 Method for chemical analysis conform to JIS G 0320. The method for chemical analysis shall . . . . . . . . . . . . . . . . . . 8.2 Metallographic test 8.2.1 Decarburized depth test The determination of decarburized depth shall be made
45、as follows: a) b) One representative test piece shall be taken from each lot of the same heat chance, the same rolling chance and of the same dimension. The test method shall be in accordance with _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 4.1 in JIS G 0558. In this case, the average decarbur
46、ized depth of cross-section for the wire rod shall be obtained by averaging the values measured at four places on the cross-section quartering the circumference so that one of them passes the point of the maximum decarburized depth. 8.2.2 Hardenability test The hardenability test shall be carried ou
47、t as follows: PROTECTED BY COPYRIGHT -,-,- 5 G 3508-1 2005 a) b) One representative test piece shall be taken from each lot of the same heat. The test method shall be as specified in JIS G 0561. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . 8.2.3 Austenitic grain size determination The determination of austenitic grain size shall be made as follows: a) The sampling plan of the test piece shall be agreed between the purchaser and the supplier. The test method shall be as specified in . . . . . . . . . . . . . . . . . . JIS G 0551. With this respect, any one method specified in JIS G 0551 shall be