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, by reference in this text, constitute provisions of this Standard. For dated reference, subsequent amendments (excluding corrigendum), or revisions, 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 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 C 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 friction of aluminum in coating is about 55%; that of silicic 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.
