GB/T 2518-2019 English PDF (GBT2518-2019)

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GB/T 2518-2019: Continuously hot-dip zinc and zinc alloy coated steel sheet and strip
GB/T 2518-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 2518-2008, GB/T 14978-2008
Continuously Hot-dip Zinc and Zinc Alloy Coated Steel
Sheet and Strip
ISSUED ON: DECEMBER 10, 2019
IMPLEMENTED ON: JULY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative References ... 6 
3 Terms and Definitions ... 8 
4 Designation Representation Methods, Classification and Codes... 10 
5 Order Content ... 17 
6 Dimensions, Shapes and Weights ... 17 
7 Technical Requirements ... 18 
8 Test Methods ... 36 
9 Inspection Rules ... 37 
10 Packaging, Marking and Quality Certificate ... 38 
Appendix A (informative) A Comparison of Approximate Designations in This
Standard and Related Standards at Home and Abroad ... 39 
Appendix B (informative) An Introduction and Selection Guide to Coating Type
... 42 
Appendix C (normative) Weight Calculation Method in Theoretical Weighing 44 
Appendix D (informative) Chemical Composition of Steel ... 46 
Continuously Hot-dip Zinc and Zinc Alloy Coated Steel
Sheet and Strip
1 Scope
This Standard stipulates the terms, definitions, classification, codes, designation
representation methods, order content, dimensions, shapes, weights, technical
requirements, test methods, inspection rules, packaging, marking and quality
certificate of continuously hot-dip zinc, zinc-iron alloy, zinc-aluminum alloy and
aluminum-zinc alloy coated steel sheet and strip (hereinafter referred to as steel sheet
and strip).
This Standard is applicable to steel sheets and strips (with the thickness of 0.20 mm ~
6.0 mm) for the automotive, construction and household appliance industry, etc.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Steel and Iron - Determination of Aluminum Content - Chrome Azurol S
Photometric Method
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 223.14 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 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Diantipyrylmethane Photometric Method for the Determination of Titanium Content
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
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 223.63 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 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin
Spectrophotometric Method for the Determination of Boron Content
GB/T 228.1-2010 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature
GB/T 247 General Rule of Package, Mark and Certification for Steel Plates (sheets)
and Strips
GB/T 1839-2008 Test Method for Gravimetric - Determination of the Mass per Unit
Area of Galvanized Coatings on Steel Products
GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and Test
Pieces for Mechanical Testing
GB/T 4336 Carbon and Low-alloy Steel - Determination of Multi-element Contents -
Spark Discharge Atomic Emission Spectrometric Method (routine method)
GB/T 5027 Metallic Materials - Sheet and Strip - Determination of Plastic Strain Ratio
GB/T 5028 Metallic Materials - Sheet and Strip - Determination of Tensile Strain
Hardening Exponent
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and Judgement
of Limiting Values
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition
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 20125 Low-alloy Steel - Determination of Multi-element Contents - Inductively
Coupled Plasma Atomic Emission Spectrometric Method
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 24174 Steel - Determination of Bake-Hardening - Index (BH2)
GB/T 25052-2010 Continuously Hot-dip Coated Steel Sheet and Strip - Tolerances on
Dimensions, Shape and Weight
ISO 6892-1:2016 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Hot-dip Zinc Coating
Hot-dip zinc coating refers to pure zinc coating obtained by immersing pretreated steel
strip in molten zinc solution on continuous hot-dip zinc production line.
NOTE: in the molten zinc solution, zinc content is not less than 99%.
3.2 Hot-dip Zinc-iron Alloy Coating
Hot-dip zinc-iron alloy coating refers to zinc-iron alloy coating obtained by immersing
pretreated steel strip in molten zinc solution on continuous hot-dip zinc production line.
NOTE: in the molten zinc solution, zinc content is not less than 99%. Through alloying
treatment process, form zinc-iron alloy layer on the entire coating, and iron content
in the alloy coating is generally: 8% ~ 15%.
3.3 Hot-dip Zinc-aluminum Alloy Coating
Hot-dip zinc-aluminum alloy coating refers to coating obtained by immersing pretreated
steel strip in molten zinc-aluminum alloy solution on continuous hot-dip zinc aluminum
production line.
NOTE: in the molten zinc aluminum alloy solution, the mass fraction of aluminum is
approximately 5%; contain a small amount of rare earth; the remaining ingredient
is zinc.
3.4 Hot-dip Aluminum-zinc Alloy Coating
be transformed into martensitic structure.
NOTE: it has a higher work hardening rate, uniform elongation rate and tensile strength. I
comparison with complex phase steel with equivalent tensile strength, it has a
higher elongation rate.
3.11 Complex Phase Steel
Complex phase steel refers to steel, whose microstructure is a small amount of
martensite, retained austenite or pearlite distributed on the ferrite or bainite...