GB/T 6478-2001 English PDF (GBT6478-2001)

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GB/T 6478-2001: Steels for cold heading and cold extruding
GB/T 6478-2001
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.10
H44
neq ISO 4954.1993
Steels for Cold Heading and Cold Extruding
ISSUED ON. SEPTEMBER 15, 2001
IMPLEMENTED ON. FEBRUARY 1, 2002
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China
Table of Contents
1 Scope ... 5 
2 Normative References ... 5 
3 Ordering Instructions ... 8 
4 Classification and Code Number ... 9 
5 Dimension, Shape, Weight and Allowable Deviation ... 9 
6 Technical Requirements ... 9 
7 Test Methods ... 14 
8 Inspection Rules ... 14 
9 Packaging, Marking and Quality Certificate ... 15 
Appendix A (Informative) Mechanical Properties of Samples Intended for
Heat Treatment ... 16 
Foreword
This Standard non-equivalently adopts international standard ISO4954.1993 "Steels
for Cold Heading and Cold Extruding". For steels not intended for heat treatment, the
mass fractions of S and P are reduced to 0.035%; for boron treated steels for
quenching and tempering, the mass fraction range of boron is narrowed; acid leaching
macrostructure inspection is added; and the specification for cold upsetting test is
expanded to 5.0mm~40mm and judged by classification.
The changes of main content in this revision are as follows.
- This Standard is named as “Steels for Cold Heading and Cold Extruding";
- Steels for cold heading and cold extruding are classified into three types - steels
not intended for heat treatment, case hardening steels, and steels for quenching
and tempering (including boron treated steel) according to the service
conditions of steel;
- Fourteen designations such as CC4A, CC15K, CC21K, 37Cr4E, CE20BG1,
CE288, CE358, CE20BG2, 35MnB5E, 37CrB1E in ISO 4954.1993 (the
corresponding designations in GB/T 6478 are ML04A1, ML15, ML20, ML37Cr,
ML208, the M1.288, M1.358, ML20MnB, ML35MnB, ML37CrB); and SWRCH1
8A, SWRCH22A in JIS G 3507-1991 "Carbon Steel Wire Rod for Cold Heading"
(the corresponding designations in GB/T 6478 are ML18Mn and ML22Mn); as
well as ML15Mn, ML20MnVB which are produced in large quantity in recent
years;
- Three designations - ML40Mn, ML45Mn and ML15Cr, which have not been used
for ordering are deleted.
- For the same designations of steels that are not intended for heat treatment in
this Standard and GB/T 6478-1986, the mass fraction range of carbon is
narrowed; the mass fraction range of silicon is broaden; and the mass fraction
range of manganese is changed from 0.20%~0.50% to 0.30%~0.60%. For the
designations of steels for case hardening, quenching and tempering (including
boron treated steel), the mass fraction range of carbon is narrowed; and the
mass fraction range of manganese is changed from 0.50%~0.80% to
0.60%~0.90%;
- Requirements for the mechanical properties of steels that are not intended for
heat treatment delivered in hot rolling condition are added in this Standard.
- Requirements for mechanical properties of steels for case hardening, quenching
and tempering (including boron treated steel) delivered in annealing condition
are added.
- The mechanical properties of samples intended for heat treatment are not
necessary in this Standard. If it is required by the purchaser, relevant values
may be determined based on the agreement of both supplier and purchaser,
and indicated in the contract.
Appendix A of this Standard is informative.
This Standard shall replace GB/T 6478-1986 "Cold Heading Steel - Technical
Requirements" since the implementation date.
This Standard was proposed by the State Metallurgical Industry Bureau.
This Standard shall be under the jurisdiction of National Technical Committee on Iron
and Steel of Standardization Administration of China.
Drafting organization of this Standard. Taiyuan Iron and Steel (Group) Co., Ltd.
Chief drafting staffs of this Standard. Liu Peng, Niu Chenmei, Gao Ping, Zhao
Jianping, Han Yi and Liang Zhenshan.
This Standard was issued in June 1986 for the first time.
Steels for Cold Heading and Cold Extruding
1 Scope
This Standard specifies the classification, code number, size, appearance, weight,
allowable deviation, technical requirements, test methods, inspection rules, packaging,
marking and quality certificate of steels for cold heading and cold extruding.
This Standard is applicable to unalloyed and alloyed steel hot rolled wire rod with a
diameter of 5mm~40mm and intended for cold heading and cold extruding, as well as
the unalloyed and alloyed steel hot-rolled round steel with a diameter of
12mm~100mm and intended for cold heading and cold extruding.
2 Normative References
The following normative documents contain provisions which, through reference into
this Standard, constitute the provisions of this Standard. At the time of publication, the
editions indicated were valid. All standards will be revised and all parties who reach an
agreement according to this Standard are encouraged to study whether the latest
editions of the following standards are applicable.
GB/T 222-1984 Method of Sampling Steel for Determination of Chemical
Composition and Permissible Variations for Product Analysis
GB/T 223.3-1988 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination
of Phosphorus Content
GB/T 223.5-1997 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Reduced Molybdosilicate Spectrophotometric Method for the Determination of
Acid-soluble Silicon Content
GB/T 223.8-1991 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Sodium Fluoride Separation - EDTA Titration Method for the Determination of
Aluminium Content
GB/T 223.9-1989 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Chrom Azurol S Photometric Method for the Determination of Aluminium Content
GB/T 223.10-1991 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Cupferron Separation-chrome Azurol S Photometric Method for the Determination
of Aluminium Content
GB/T 223.11-1991 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Ammonium Persulfate Oxidation Volumetric Method for the Determination of
Chromium Content
GB/T 223.12-1991 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Sodium Carbonate Separation-diphenyl Carbazide Photometric Method for the
Determination of Chromium Content
GB/T 223.13-1989 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Ammonium Ferrous Sulfate Titration Method for the Determination of Vanadium
Content
GB/T 223.14-1989 Methods for Chemical Analysis of Iron, Steel and Alloy - The
N-benzoy-N-phenylhydroxylamine Extraction Photometric Method for the
Determination of Vanadium Content
GB/T 223.16-1991 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Chromotropic Acid Photometric Method for the Determination of Titanium Content
GB/T 223.17-1989 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.18-1994 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper
Content
GB/T 223.19-1989 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Neocuproine-chloroform Extraction Photometric Method for the Determination of
Copper Content
GB/T 223.23-1994 Methods for Chemical...