GB/T 6478-2015 English PDF (GB/T6478-2015)

GB/T 6478-2015: Steels for cold heading and cold extruding
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GB/T 6478-2015
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 and 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
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.
This Standard is applicable to the hot-rolled wire rod with nominal diameter
5.0mm~60mm, and hot-rolled round steel (hereinafter referred to as steel) with nominal
diameter 12mm~100mm.
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
GB/T 223.4 Alloyed Steel – Determination of Manganese Content – Potentiometric
or Visual Titration Method
GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy - the Reduced
Molybdosilicate Spectrophotometric Method for the Determination of Acid-Soluble
Silicon Content (GB/T 223.5-2008, ISO 4829-1.1996, ISO 4829-2.1998, MOD)
GB/T 223.8 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 Methods for Chemical Analysis of Iron, Steel and Alloy - the Chrom
Azurol S Photometric Method for the Determination of Aluminium Content
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method (GB/T 223.11-2008, ISO 4937.1986,
MOD)
GB/T 223.12 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 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 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 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Chromotropic Acid Photometric Method for the Determination of Titaninm Content
GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.18 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 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 Iron, Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy - the
Indophenol Blue Photometric Method for the Determination of Nitrogen Content
after Distillation Separation
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Copper
Content
GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Nickel
Content
GB/T 223.58 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 Iron, Steel and Alloy - Determination of Phosphorus Content -
Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.60 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 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Ammonium Phosphomolybdate Volumetric Method for the Determination of
Phosphorus Content
GB/T 223.62 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 Methods for chemical analysis of iron, steel and alloy--The
sodium(potassium)periodate photometric method for the determination of
manganese content
GB/T 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame
Atomic Absorption Spectrometric Method
GB/T 223.67 Iron, Steel and Alloy - Determination of Sulfur Content - Methylene
Blue Spectrophotometric Method (GB/T 223.67-2008, ISO 10701.1994, IDT)
GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the
Determination of Sulfur Content
GB/T 223.69 Iron, Steel and Alloy - Determination of Carbon Contents - Gas-
volumetric Method after Combustion in the Pipe Furnace
GB/T 223.71 Methods for Chemical Analysis of Iron, Steel and Alloy the
Gravimetric Method after Combustion in the Pipe Furnace for the Determination
of Carbon Content
GB/T 223.72 Iron, Steel and Alloy - Determination of Sulfur Content - Gravimetric
Method
GB/T 223.75 Iron steel and alloy - Determination of boron content - Methanol
distillation-curcumin photometric method
GB/T 223.76 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrometric Method for the Determination of Vanadium
Content
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin
Spectrophotometric Method for the Determination of ...
GB/T 6478-2015
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 and 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
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.
This Standard is applicable to the hot-rolled wire rod with nominal diameter
5.0mm~60mm, and hot-rolled round steel (hereinafter referred to as steel) with nominal
diameter 12mm~100mm.
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
GB/T 223.4 Alloyed Steel – Determination of Manganese Content – Potentiometric
or Visual Titration Method
GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy - the Reduced
Molybdosilicate Spectrophotometric Method for the Determination of Acid-Soluble
Silicon Content (GB/T 223.5-2008, ISO 4829-1.1996, ISO 4829-2.1998, MOD)
GB/T 223.8 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 Methods for Chemical Analysis of Iron, Steel and Alloy - the Chrom
Azurol S Photometric Method for the Determination of Aluminium Content
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method (GB/T 223.11-2008, ISO 4937.1986,
MOD)
GB/T 223.12 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 Methods for Chemical Analysis of Iron, Steel and Alloy - the
Ammonium Ferrous Sulfate Titration Method for the Determination of Va...