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GB/T 12754-2006 English PDF (GBT12754-2006)

GB/T 12754-2006 English PDF (GBT12754-2006)

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GB/T 12754-2006: Prepainted steel sheet

This standard specifies the terms and definitions, classification and code, dimension, shape, weight, technical requirements, inspection and test as well as package, marking and quality certificate of prepainted steel sheet. This standard is applicable to prepainted steel sheets for building interior and exterior applications, prepainted steel sheet for home appliances and other uses may refer to it in application.
GB/T 12754-2006
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
CS 77.140.50
H 46
Replacing GB/T 12754-1991
Prepainted Steel Sheet
ISSUED ON. FEBRUARY 5, 2006
IMPLEMENTED ON. AUGUST 1, 2006
Issued by. General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
GB
Table of Contents
Foreword ... 4
1 Scope .. 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Classification and Code ... 7
5 Ordering Items ... 9
6 Dimension, Shape, Weight and Permissible Deviation ... 10
7 Technical Requirements ... 10
8 Inspection, Test and Reinspection ... 15
9 Packaging, Marking and Inspection Certificate... 16
10 Approximate Designation (Grade) Comparison for Common Steel
Substrate of Prepainted Steel Sheet at Home and Abroad .. 16
11 Description for Corrosivity of Service Environment of Prepainted Steel Sheet ... 16
12 Selection of Prepainted Steel Sheet ... 16
13 Storage, Transportation and Handling of Prepainted Steel Sheet ... 17 14 Machining of Prepainted Steel Sheet ... 17
15 Life to the First Major Maintenance and Durability of Prepainted Steel Sheet ... 17
16 Atmospheric Corrosion Test Field of Prepainted Steel Sheet .. 17
Appendix A (Normative) Permissible Deviation in Dimension and Shape of
Prepainted Steel Sheet .. 18
Appendix B (Normative) Mechanical Property of Prepainted Steel Sheet ... 21 Appendix C (Informative) Approximate Designation (Grade) Comparison for Common Steel Substrate of Prepainted Steel Sheet at Home and Abroad ... 25 Appendix D (Informative) Description for Corrosivity of Service Environment of Prepainted Steel Sheet ... 27
Appendix E (Informative) Selection of Prepainted Steel Sheet ... 30
Appendix F (Informative) Storage, Transportation and Handling of Prepainted Steel Sheet ... 33
Appendix G (Informative) Machining of Prepainted Steel Sheet .. 35
Appendix H (Informative) Life to the First Major Maintenance and Durability of Prepainted Steel Sheet .. 37
Appendix I (Informative) Atmospheric Corrosion Test Field of Prepainted Steel Sheet ... 38
Foreword
This standard is a revision of "Prepainted Steel Sheet" (GB/T 12754-1991) on the basis of summarizing the production and use conditions of prepainted steel sheets in China, and by reference to "Continuously Organic Coated (Coil Coated) Steel Flat Products - Part 1. General Information (Definitions, Materials, Tolerances, Test Methods)" (English edition) (EN 10169- 1. 2003), "Continuously Organic Coated (Coil Coated) Steel Flat Products - Part 2. Products for Building Exterior Applications" (English edition)(ENV 10169-2.1999), "Continuously Organic Coated (Coil Coated) Steel Flat Products - Part 3. Products for Building Interior Applications" (English edition) (EN 10169-3.2003), "Prefinished/Prepainted Sheet Metal Products for Interior/Exterior Building Applications - Property Requirements" (AS/NZS 2728.1997), and "Precoated Hot-dip Metal- and Coil-coated Steel Sheets for Building Exterior Applications " (ASTM A755 M-03).
This standard replaces "Prepainted Steel Sheet" (GB/T 12754-1991).
Compared with GB/T 12754-1991, main changes in this standard are as follows. - "Terms and Definitions" of Chapter 3 were added;
- The requirements of designation naming method were added, and designation of prepainted steel sheet was provided with;
- Hot dip Al-Zn alloy steel substrate and hot dip Zn-Al steel substrate were added, while cold-rolled baseplate was cancelled;
- High-durability polyester and polyvinylidene fluoride were added for finish paint, while acrylic acid, plastisol and organosol were cancelled;
- Classification for surface structure of hot dip galvanizing steel substrate and coating structure was added;
- "Information Necessary for Ordering" in Chapter 5 was added;
- Dimensional range supplied was adjusted;
- The requirements of permissible deviation in thickness of prepainted steel sheet were added, and that in length, width and shape was modified (see Appendix A); - The requirements for mechanical properties of prepainted steel sheet were added (see Appendix B);
- The requirements for types of steel substrate and coating weight were added; - Classification, adjustment, supplement and perfection for property indexes of top side coating were carried out over again, and the requirements for property of bottom side coating were added;
- Description for defects resulted from weathering was added in surface quality; - Informative appendix "Approximate Designation (Grade) Comparison for Common Steel Substrate of Prepainted Steel Sheet at Home and Abroad" was added (see Appendix C); - Informative appendix "Description for Corrosivity of Service Environment of Prepainted Steel Sheet" was added (see Appendix D);
- Informative appendix "Selection of Prepainted Steel Sheet" was added (see Appendix E); - Informative appendix "Storage, Transportation and Handling of Prepainted Steel Sheet" was added (see Appendix F);
- Informative appendix "Machining of Prepainted Steel Sheet" was added (see Appendix Prepainted Steel Sheet
1 Scope
This standard specifies the terms and definitions, classification and code, dimension, shape, weight, technical requirements, inspection and test as well as package, marking and quality certificate of prepainted steel sheet.
This standard is applicable to prepainted steel sheets for building interior and exterior applications (hereinafter referred as "prepainted steel sheet"), prepainted steel sheet for home appliances and other uses may refer to it in application.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrigenda), or revisions of, any of these publications do not apply. However, all parties coming to 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 normative document applies.
GB/T 228 Metallic Materials - Tensile Testing at Ambient Temperature (eqv ISO 6892.1998)
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel Plates (Sheets) and Strips
GB/T 1766-1995 Paints and Varnishes - Rating Schemes of Degradation of Coats GB/T 1839 Steel Product Zinc Coating Mass Testing Method
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing (eqv ISO 377.1997)
GB/T 13448 Test Methods for Prepainted Steel Sheet
GB/T 17505 Steel and Steel Products. General Technical Delivery Requirements (eqv ISO 404.1992 (E))
3 Terms and Definitions
For the purpose of this standard, the following terms and definitions apply. 3.1
Prepainted steel sheet
The product cured through baking after organic coatings are continuously coated on surface-pretreated steel substrate (at least 2 layers for the top side). 3.2
Steel substrate
The steel strip for coating paints.
3.3
Top side
One of the two prepainted steel sheet surfaces which has relatively high requirements of color , coating property and surface quality.
3.4
Bottom side
The side opposite to the top side of prepainted steel sheet.
3.5
Building exterior applications
The uses affected by external atmospheric environment.
3.6
Building interior applications
The uses affected by internal environment.
3.7
Hardness
The capacity of coating for withstanding mechanical effects such as scratch, friction, impact and press-in.
3.8
Flexibility
The capacity of coating and steel substrate for resisting damage under concurrent deformation.
3.9
Adhesion
The combination degree between coatings or coating and steel substrate. 3.10
Life to the first major maintenance
The time interval from completion of production to the time where the original coating must be heavily maintained so as to protect the steel substrate.
3.11
Durability
The capacity of coating for meeting the specified life to the first major maintenance. 3.12
Weathering
Increasing deterioration of coating property under influence of service environment. 4 Classification and Code
4.1 Designation naming method
13 Storage, Transportation and Handling of
Prepainted Steel Sheet
Storage, transportation and handling of prepainted steel Sheet are detailed in Appendix F. 14 Machining of Prepainted Steel Sheet
Machining of prepainted steel sheet is detailed in Appendix G.
15 Life to the First Major Maintenance and Durability
of Prepainted Steel Sheet
Life to the first major maintenance and durability of prepainted steel she...

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