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

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

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GB/T 6478-2001: Steels for cold heading and cold extruding

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.
GB/T 6478-2001
GB
NATIONAL STANDARD OF THE
PEOPLE 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 Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content
GB/T 223.24-1994 Methods for Chemical Analysis of Iron, Steel and Alloy - The Extraction Separation - The Dimethylglyoxime Spectrophotometric Method for the Determination of Nickel Content
GB/T 223.26-1989 Methods for Chemical Analysis of Iron Steel and Alloy - The Thiocyanate Direct Photometric Method for the Determination of Molybdenum Content
GB/T 223.53-1987 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper Content
GB/T 223.58-1987 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Arsenite-sodium Nitrite Titrimetric Method for the Determination of Manganese Content
GB/T 223.59-1987 Methods for Chemical Analysis of Iron, Steel and Alloy - The Reduced Molybdoantimonyl Phosphoric Acid Photometric Method for the
Determination of Phosphorus Content
GB/T 223.60-1997 Methods for Chemical Analysis of Iron, Steel and Alloy - The Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content
GB/T 223.61-1988 Methods for Chemical Analysis of Iron, Steel and Alloy - The Ammonium Phosphomolybdate Volumetric Method for the Determination of
Phosphorus Content
GB/T 223.62-1988 Methods for Chemical Analysis of Iron, Steel and Alloy - The Butyl Acetate Extraction Photometric Method for the Determination of Phosphorus Content
GB/T 223.63-1988 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium (Potas...

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