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GB/T 6478-2015 English PDF (GBT6478-2015)

GB/T 6478-2015 English PDF (GBT6478-2015)

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GB/T 6478-2015: Steels for cold heading and cold extruding

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.
GB/T 6478-2015
GB
NATIONAL STANDARD OF THE
PEOPLE 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 ...

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