GB/T 6478-2015 PDF English
US$125.00 · In stock · Download in 9 secondsGB/T 6478-2015: Steels for cold heading and cold extruding Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 6478: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 6478-2015 | English | 125 |
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Steels for cold heading and cold extruding
| Valid |
| GB/T 6478-2001 | English | 70 |
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Steels for cold heading and cold extruding
| Obsolete |
| GB/T 6478-1986 | English | 239 |
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Cold heading steel--Technical requirements
| Obsolete |
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GB/T 6478-2015: Steels for cold heading and cold extruding---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT6478-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.10
H 44
Replacing GB/T 6478-2001
Steels for Cold Heading and Cold Extruding
(ISO 4954.1993, MOD)
Issued on. SEPTEMBER 11, 2015
Implemented on. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative References... 6
3 Booking Contents... 10
4 Classification and Grade Expression method... 11
6 Technical Requirements... 12
8 Inspection Rules... 21
Appendix A (Informative) Mechanical Property of Heat-Treated Specimen... 23
Appendix B (Informative) Grade Comparison List between this Standard and
Domestic & Foreign Standard... 29
Appendix C (Informative) Clause No. Comparison List between this
Standard and ISO 4954.1993... 33
Appendix D (Informative) Technical Differences and Causes between this
Standard and Applied International Standard... 34
Bibliography... 36
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 6478-2001 Steels for Cold Heading and Cold Extruding.
Compared with GB/T 6478-2001, this Standard has the major technical changes as
follows.
--- Expand the upper limit of applicable wire rod diameter from 40mm to 60mm;
--- Add non-quenched/tempered steel for cold heading and cold extruding in the
“classification”;
--- Confirm the allowable deviation of hot-rolled wire rod dimension conforms to the
provisions of Grade-B accuracy stipulated in GB/T 14981-2009;
--- Add 14 grades and relevant technical requirements, such as ML06Al, ML10,
ML12Al, ML12, ML15Cr, ML30Cr, ML45Cr, ML20CrMo, ML25CrMo, ML45CrMo,
ML25B, ML25MnB, ML30MnB, ML40Mnb;
--- Add MFT8, MFT9 and MFT10 non-quenched/tempered steel for cold heading
and cold extruding, and relevant requirements;
--- Increase the manganese content in Grade ML30~ML45 from 0.30%~0.60% to
0.60%~0.90%; delete the relevant requirements of two Grades ML30Mn and
ML35Mn;
--- Adjust ML22Mn into ML20Mn; ML37Cr into ML35Cr; ML42CrMo into ML40CrMo;
ML28B into ML30B;
--- Straighten the phosphorus content and sulfur content in the quenched/tempered
steel for cold heading and cold extruding from “≤0.035%” to “≤0.025%”;
--- Add the refining requirements outside of the furnace;
--- Modify the decarburization requirements;
--- Modify the macrostructure requirements;
--- Modify the surface quality requirements;
--- Add the relevant provisions of digit rounding off;
--- Modify the re-inspection and judgment rules;
--- Add Appendix B “Grade Comparison List between this Standard and ISO
4954.1993, etc.”;
--- Add Appendix C “Clause No. Comparison List between this Standard and Parts
of ISO 4954.1993”
--- Add Appendix D “Technical Difference and Causes between this Standard and
ISO 4954.1993”.
This Standard adopts the re-drafting method to modify and use ISO 4954.1993 Steels
for Cold Heading and Cold Extruding.
Compared with ISO 4954.1993, this Standard has more adjustments in the structure;
Appendix C gives the Clause No. Change Comparison List between this Standard and
ISO 4954.1993.
Considering China’s national conditions, this Standard modifies ISO 4954.1993 when
adopting it; the relevant technical differences have been compiled into the text; the
involved clauses of which have been marked with vertical single line in the blank
margin of the clauses. Appendix D gives the technical differences and causes list for
reference.
This Standard has also made the following editorial changes.
--- Replace “this international standard” with “this Standard”;
--- Replace “comma that represents decimal point” with “decimal point”;
--- Delete the foreword of the international standard.
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel (SAC/TC 183).
Drafting organizations of this Standard. Jiangsu Shagang Group Co., Ltd.,
Zhangjjiagang Lianfeng Iron and Steel Research Institute Co., Ltd., Qingdao Iron and
Steel Co., Ltd., Fangda Special Steel Technology Co., Ltd., Ningbo Zhenhai Jinli High
Strength Fasteners Co., Ltd., Hangzhou Iron and Steel Group Company, China
Metallurgical Information and Standardization Research Institute, Xingtai Iron and
Steel Co., Ltd., Beijing Jiaotong University, Shougang Corporation, and Magang
(Group) Holding Co., Ltd.
Chief drafting staffs of this Standard. Li Xiaobo, Yuan Changsheng, Luan Yan, Hui
Weijun, Huang Zhengyu, Zhang Xiantie, Hu Haiping, Zhang Na, Lu Xinwu, Wo Jinyuan,
and Yu Tongren.
The historical editions replaced by this Standard are as follows.
--- GB/T 6478-1986, GB/T 6478-2001.
Steels for Cold Heading and Cold Extruding
1 Scope
This Standard specifies the classification, grade, ordering contents, dimension,
appearance, weight and allowable deviation, technical requirements, test methods,
inspection rules, package, mark, and quality certificate, etc. for the non-alloyed steels
and alloyed structural steels for cold heading and cold extruding.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 222 Permissible Tolerance for Chemical Composition of Steel Products
GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - the
Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination
of Phosphorus Content
3 Booking Contents
According to this Standard, the booking contract shall include the following contents.
4 Classification and Grade Expression method
The steels can be divided into four types according to the using state in this Standard.
not heat-treated steel, case-hardened steel, quenched and tempered steel (including
boron-contained steel) and non-quenched and tempered steel for cold heading and
cold extruding.
5 Dimension, Appearance, Weight and Allowable Deviation
5.1 The dimension, appearance, weight and allowable deviation of hot-rolled round
steel shall conform to the provisions of GB/T 702.
5.3 According to the negotiation between the supplier and the purchaser, other
specification and accuracy of round steel and wire rod can be supplied.
6 Technical Requirements
The quenched and tempered steel (including the boron-contained steel) or non-
quenched and tempered steel shall conduct the decarbonization layer test. The depth
of decarbonization layer shall conform to the provisions of Table 9.
According to the demand of the purchaser, the steel shall be conducted macrostructure
acid leaching inspection.
7 Test Methods
7.1 The inspection items, sampling quantity, sampling method and inspection method
of each batch of steels shall conform to the provisions of Table 11.
8 Inspection Rules
The steels shall be checked and accepted per batch; each batch consists of the steels
with the same furnace number, the same grade, the same specification and the same
heat-treatment furnace times.
9 Package, Mark, and Quality Certificate
Unless otherwise is specified, the steel package, mark and quality certificate shall
conform to the provisions of GB/T 2101.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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