GB/T 2518-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 2518-2019 | English | 365 |
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Continuously Hot-dip Zinc and Zinc Alloy Coated Steel Sheet and Strip
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| GB/T 2518-2008 | English | 125 |
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Continuously hot-dip zinc-coated steel sheet and strip
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| GB/T 2518-2004 | English | 599 |
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Continuous hot-dip zinc-coated steel sheets and strips
| Obsolete |
| GB/T 2518-1988 | English | 359 |
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Continual hot-dip zinc-coated steel sheets and strips
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GB/T 2518-2019: Continuously Hot-dip Zinc and Zinc Alloy Coated Steel Sheet and Strip---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2518-2019
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
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
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
Hot-dip aluminum-zinc alloy coating refers to coating obtained by immersing pretreated
steel strip in molten aluminum-zinc alloy solution on continuous hot-dip aluminum-zinc
production line.
3.5 Interstitial Free Steel
Interstitial free steel refers to a type of steel, which adds an appropriate amount of
titanium or niobium to ultra-low carbon steel, so that the carbon and nitrogen interstitial
atoms in the steel are completely fixed into carbide and nitride, and no interstitial atom
exists in the steel.
3.6 High Strength Interstitial Free Steel
High strength interstitial free steel refers to steel which adds a certain amount of
strengthening elements, such as. phosphorus, manganese and silicon, to interstitial
free steel, so that the steel has high strength and can maintain good formability.
3.7 Bake Hardening Steel
Bake hardening steel refers to a type of steel, which retains a certain amount of solid
dissolved carbon and nitrogen atoms, and can enhance the strength by adding
strengthening elements, such as. phosphorus and manganese; after processing and
baking at a certain temperature, the yield strength is further enhanced due to age
hardening.
4 Designation Representation Methods, Classification and Codes
4.1 Designation Representation Methods
4.1.1 General
The designation of steel sheet and strip is constituted of five parts. product purpose
code, steel grade code (or serial number), steel type characteristic (if any), hot-dip
code (D) and coating type code. Specifically speaking, hot-dip code (D) and coating
type code shall be connected by a plus “+”.
4.1.2 Purpose code
Purpose codes are as follows.
4.1.3 Steel grade code (or serial number)
Steel grade codes are as follows.
4.1.4 Steel type characteristic
Generally speaking, steel type characteristic is expressed with 1 ~ 2 letters.
Characteristic codes are as follows.
4.1.5 Hot-dip code
Hot-dip code is expressed in “D”.
4.1.6 Coating type code
Pure zinc coating is expressed in “Z”; zinc-iron alloy coating is expressed in “ZF”; zinc-
aluminum alloy coating is expressed in “ZA”; aluminum-zinc alloy coating is expressed in “AZ”.
4.2 Examples of Designation
Example 1.DC57D+ZF
It signifies that product purpose is flat steel for cold forming; substrate is stipulated to
be cold-rolled substrate; steel grade serial number is 57; hot-dip zinc-iron alloy coated
product.
4.3 Designations and Steel Type Characteristics
4.4 Classification and Codes by Surface Quality
In accordance with surface quality, the classification and codes of steel sheet and strip
shall comply with the stipulations in Table 2.
4.5 Classification and Codes by Type and Surface Structure of Coating,
and Surface Treatment
4.5.1 In accordance with the type and surface structure of coating, and surface
treatment, the classification and codes of steel sheet and strip shall comply with the
Designation Steel Type Characteristic
4.5.2 Please refer to Appendix B for an introduction and selection guide to the types of
coating.
5 Order Content
5.1 Contracts or orders which order products in accordance with this Standard shall include the following content.
5.2 If order contract does not indicate specific requirements for dimensions,
unevenness accuracy, surface treatment type, surface quality, surface structure and
packaging mode, then, the supply-side shall supply in accordance with the common
accuracy of dimensions and unevenness; surface treatment. oiling (O); surface quality
level. common level of surface (FA) in GB/T 25052-2010, and the surface structure
and packaging mode appointed by the supply-side. If order contract does not indicate
the internal diameter of steel strip, then, it shall be selected by the supply-side.
6 Dimensions, Shapes and Weights
6.1 Dimensions
6.1.1 The range of nominal dimensions of steel sheet and strip shall comply with the
stipulations in Table 4.Through the negotiation between the demand-side and the
supply-side, other dimensions of steel sheet and strip may also be provided.
Longitudinally cut steel strip refers to product obtained by longitudinally cutting steel
strip (master strip). Unless it is otherwise stipulated, steel strip includes longitudinally
cut steel strip.
6.1.2 The nominal thickness of steel sheet and strip includes the thickness of substrate
and the thickness of coating.
6.2 Dimensions, Shapes and Allowable Deviations
The dimensions, shapes and allowable deviations of steel sheet and strip shall comply
with the stipulations in GB/T 25052-2010.Specifically speaking, the thickness
tolerance of steel sheet and strip with the designation of DX51D+Z, DX51D+ZF,
DX51D+ZA, DX51D+AZ, S550GD+Z, S550GD+ZF, S550GD+ZA, S550GD+AZ shall
comply with the stipulations in Table 2 in GB/T 25052-2010; unevenness shall comply
with the stipulations in Table 9 in GB/T 25052-2010.
6.3 Weights
Steel sheet shall be delivered in accordance with the theoretical weight or actual weight.
The calculation method for theoretical weight shall comply with the stipulations in
Appendix C. Generally speaking, steel strip shall be delivered in accordance with the
actual weight.
7 Technical Requirements
7.1 Chemical Composition
The chemical composition (smelting analysis) of steel may take the stipulations in
Item Nominal Dimensions
7.2 Smelting Method
Steel should adopt oxygen converter or electric furnace for smelting. Unless it is
otherwise stipulated, the mode of smelting shall be selected by the supply-side.
7.3 Delivery State
Steel sheet and strip shall receive hot-dip or hot-dip and flattening (or finishing), then, be delivered.
7.4 Mechanical Properties
7.5 Stretcher Strain Marks
7.5.1 The limitation period of stretcher strain marks of various designations of steel
sheet and strip shall comply with the stipulations in Table 14.The limitation period of
stretcher strain marks shall be calculated since the date that manufacture is completed.
Within the limitation period of stretcher strain marks, the supply-side shall guarantee
that stretcher strain marks will not emerge.
7.5.2 If there are special requirements for stretcher strain marks, they shall be
negotiated during the ordering and indicated in the contract.
7.6 Coating Adhesiveness
Coating adhesiveness shall be tested with appropriate test methods. Unless it is
otherwise stipulated, test methods shall be selected by the supply-side.
7.7 Coating Mass
7.7.1 The nominal coating mass range that can be supplied shall comply with the
stipulations in Table 15.Through the negotiation between the demand-side and the
supply-side, other coating masses may also be provided.
7.7.2 The recommended nominal coating masses and corresponding coating codes
shall comply with the stipulations in Table 16.Through the negotiation between the
7.8 Surface Structure of Coating
7.8.1 The surface structure of coating of steel sheet and strip shall comply with the
stipulations in Table 18.
7.8.2 In terms of pure zinc coating, when the surface structure is requested to be
obvious spangle, it shall be indicated in ordering. When products with the coating
surface structure of common spangle cannot satisfy user’s requirements for the quality
of surface appearance, products with the surface structure of small spangle, or,
spangle free surface structure may be ordered.
7.9 Surface Treatment
7.10 Surface Quality
7.10.1 On the surface of steel sheet and strip, there shall be no defects that would
affect the usage, such as. skip platin, peeling of coating and visible cracks, etc. On the
edges of untrimmed steel strip, tiny cracks and white edges may be allowed to exist
on the zinc coating.
7.10.4 The control range and inspection methods for surface roughness (Value Ra)
may be negotiated during the ordering. The requirements for roughness are
inapplicable to surface that has not received finishing treatment (surface quality level. FA).
7.11 Special Requirements
If the demand-side requests, through the negotiation between the demand-side and
the supply-side, the corrosion resistance of steel sheet may be evaluated. The test
methods and evaluation indicators shall be negotiated during the ordering and
indicated in the contract.
8 Test Methods
8.1 Generally speaking, the chemical composition test of steel shall be conducted in
accordance with the methods in GB/T 4336, GB/T 20123, GB/T 20125 and GB/T 20126,
and universal chemical analysis methods. The arbitration shall be conducted in
accordance with the stipulations in GB/T 223.5, GB/T 223.9, GB/T 223.12, GB/T
223.14, GB/T 223.17, GB/T 223.26, GB/T 223.40, GB/T 223.59, GB/T 223.60, GB/T
223.63, GB/T 223.64, GB/T 223.78, GB/T 20125 and GB/T 20126.
8.2 The inspection items and test methods of each lot of steel sheets and strips shall
comply with the stipulations in Table 20.
9 Inspection Rules
9.1 The inspection and acceptance inspection of steel sheet and strip shall be
conducted by the supply-side’s quality supervision and inspection department.
9.3 The inspection items, sampling quantity, sampling location and sampling method
of steel sheet and strip shall comply with the stipulations in Table 20.
9.4 The re-inspection and determination rules of steel sheet and strip shall comply with
the stipulations in GB/T 17505.
9.5 The inspection results of chemical composition and mechanical properties shall be
rounded off through the rounding-off and comparison method. The rules of rounding-
off for numerical values shall comply with the stipulations in GB/T 8170.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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