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GB/T 14978-2008 English PDF (GBT14978-2008)

GB/T 14978-2008 English PDF (GBT14978-2008)

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GB/T 14978-2008: Continuously hot-dip aluminum-zinc alloy coated steel sheet and strip

This Standard specifies the terms and definitions, classification and code, size, appearance, weight, technical requirements, inspection and test as well as package, mark and quality certificate of continuously hot-dip aluminum-zinc alloy coated steel sheet and strip.
GB/T 14978-2008
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 14978-1994
Continuously Hot-dip Aluminum-zinc Alloy
Coated Steel Sheet and Strip
ISSUED ON. SEPTEMBER 11, 2008
IMPLEMENTED ON. MAY 1, 2009
Jointly issued by. Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) of the People's Republic of China;
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword??...??3
1 Scope??...??5
2 Normative References??...??5
3 Terms and Definitions??...??7
4 Classification and Code??...??7
5 Ordering Information??...??9
6 Dimension, Appearance, Weight and Permissible Deviation??...??9
7 Technical Requirements??...??10
8 Inspection and Test??...??14
9 Packaging, Marking and Quality Certificate??...??15
10 Value Rounding??...??15
11 Approximate Comparison Between Domestic and Foreign Designations??...??15 Appendix A (Normative) Permissible Deviation of Dimension and Appearance of Steel Sheets and Strips??...??16
Appendix B (Normative) Calculation Method for Theoretical Weight??...??21 Appendix C (Informative) Chemical Composition of Steels??...??22
Appendix D (Informative) Approximate Comparison Between Domestic and Foreign Designations??...??23
Foreword
With reference to EN 10326.2004 "Continuously Hot-dip Coated Strip and Sheet of Structural Steels - Technical Delivery Conditions' (English version), EN 10327.2004 "Continuously Hot-dip Coated Strip and Sheet of Low Carbon Steels. Technical Delivery Conditions" (English version), EN 10143.2006 "Continuously Hot-dip Coated Steel Sheet and Strip - Deviations on Dimensions and Shape' (English version) AND AS 1397-2001 "Steel Sheet and Strip - Hot-dip Zinc-coated or Aluminum/Zinc-coated' (English version), this Standard revises GB/T 14978-1994 "Continual Hot-dip Aluminum Zinc Silicon Alloy Coated Steel Strips and Sheets".
This Standard replaces GB/T 14978-1994 "Continual Hot-dip Aluminum Zinc Silicon Alloy Coated Steel Strips and Sheets".
Compared with GB/T 14978-1994, this Standard has the main changes as follows. - Standard name was modified;
- Dimensional range was expanded;
- The provisions for coating adhesiveness were modified;
- Surface quality provisions were added;
- Post treatment method was added;
- The provisions for dimension, appearance and permissible deviation were modified;
- Calculation method for theoretical weight was added;
- Designation comparison table was added.
Appendix A and Appendix B of this Standard are normative; while Appendix C and Appendix D are informative.
This Standard was proposed by China Iron and Steel Association.
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. Baoshan Iron and Steel Co., Ltd.
Participating drafting organizations of this Standard. Panzhihua Iron and Steel Groups, China Iron and Steel Research Institute Group AND China Metallurgical Information and Standardization Institute.
Chief drafters of this Standard. Li Yuguang, Sun Zhongming, Xu Hongwei, Shi Hongyan, Wang Xiaohu, Tu Shulin, Yu Chengfeng, Xu Qing, Zhou Bo, Yu Gangqiang and Yu Dan.
The previous edition replaced by this Standard is as follows.
- GB/T 14978-1994.
Continuously Hot-dip Aluminum-zinc Alloy Coated
Steel Sheet and Strip
1 Scope
This Standard specifies the terms and definitions, classification and code, size, appearance, weight, technical requirements, inspection and test as well as package, mark and quality certificate of continuously hot-dip aluminum-zinc alloy coated steel sheet and strip (hereinafter referred to as "steel sheet and strip").
This Standard is applicable to the steel sheet and strip with thickness of 0.30mm~3.0mm mainly used for building, home appliances, electronics and automobile industry.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute the provisions of this Standard. For the dated reference, the subsequent amendments (excluding corrigendum) or revisions of these publications do not apply. However, all parties who enter into an agreement according to this Standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the document referred to applies. 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 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy - The Chromotropic Acid Photometric Method for the Determination of
Titanium 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 223.59 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 Methods for Chemical Analysis of Iron, Steel and Alloy ?€? The Perchloric Acid Dehydration Gravimetric Method for the
Determination of Silicon 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 228 Metallic Materials-Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892.1998)
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel Plates (Sheets) and Strips
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing (GB/T 2975-1998, eqv ISO 377.1997)
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission
Spectrometric Analysis of Carbon and Low-alloy Steel (Routine
Method)
GB /T 1839 Galvanizing Coat Quality Test of Steel Products
GB/T 8170 Rules for Rounding off of Numerical Values
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements (GB/T 17505-1998, eqv ISO 404.1992)
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content Infrared Absorption Method after Combustion in an Induction
Furnace (Routine Method) (GB/T 20123-2006, ISO 15350.2000,
IDT)
GB/T 20125 Low-alloy steel - Determination of Multi-element Contents -
Inductively Coupled Plasma Atomic Emission Spectrometric Method
(GB/T 20125-2006, JIS G 1258-1989, MOD)
GB/T 20126 Unalloyed steel - Determination of Low Carbon Content - Part 2. Infrared Absorption Method after Combustion in an Induction
Furnace (with Preheating) (GB/T 20126-2006, ISO 15349-2.1999,
IDT)
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition (GB/T 20066-2006, ISO
14284.1996, IDT)
3 Terms and Definitions
For the purpose of this Standard, the following terms and definitions apply. 3.1
Hot-dip aluminum-zinc alloy coating
Coating produced in continuously hot-dip aluminum-zinc production line and made of aluminum-zinc alloy; mass fraction of aluminum in coating is about 55%; mass fraction of silicon is about 1.6%; other ingredient is zinc.
3.2
Stretcher strain marks
Defects such as "slip line" and "orange peel", which damages surface appearance, on the surfaces of steel sheets or strips due to aging during cold forming. 4 Classification and Code
4.1 Designation naming method
The code of steel sheets and strips consist of product use code, steel grade character (or serial number), steel grade characteristic (if any), hot-dip code (D) and coating type code; hot-dip code (D) and coating type code are connected with "+". Detailed provisions are as follows.
4.1.1 Use code
a) DX. the first letter D represents flat steels for cold forming; if the second letter is X, it represents that there is no requirement for the rolled condition of base-plate; if the second letter is C, it represents that cold-rolled base-plate is required; if the second letter is D, it represents that hot-rolled base-plate is required; b) S. represents structural steels.
4.1.2 Steel grade character (or serial No.)
a) 51~54. two digits, represents steel grade serial No.
b) 250~550. three digits, represents steel grade character; here it is the sp...

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