GB/T 36399-2018 PDF English
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Continuously Hot-dip Aluminum-silicon
Alloy Coated Steel Sheet and Strip
Issued on: JUNE 7, 2018
Implemented on: MARCH 1, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 6
4 Classification and Nameplate Representation Method ... 7
5 Order Content ... 9
6 Dimension, Appearance and Weight ... 10
7 Technical Requirements ... 11
8 Test Methods ... 16
9 Inspection Rules ... 17
10 Packaging, Marking and Quality Certificate ... 18
Appendix A (Informative) Chemical Composition of Steel ... 19
Appendix B (Normative) Method of Al-Fe-Si Alloy Coating Weight Measurement
... 20
Appendix C (Normative) Measurement of Coating Weight, Sodium Hydroxide -
Hydrochloric Acid-Hexamethylenetetramine Exfoliation Weight Method ... 21
Appendix D (Normative) Measurement of Coating Weight, Sodium Hydroxide -
Hydrochloric Acid Exfoliation Weight Method ... 23
Appendix E (Normative) Measurement of Coating Weight, X-ray Fluorescence
Method ... 25
Continuously Hot-dip Aluminum-silicon
Alloy Coated Steel Sheet and Strip
1 Scope
This Standard specifies the terms, definitions, classification, nameplate representation
method, order content, dimension, appearance, weight, technical requirements, test
methods, inspection rules, packaging, marking and quality certificate of continuously
hot-dip aluminum-silicon alloy coated steel sheet and strip.
This Standard is applicable to continuously hot-dip aluminum-silicon alloy coated steel
sheet and strip (hereinafter referred to as steel sheet and strip) with the thickness of
0.30 mm ~ 3.0 mm for the purposes of automobile, household appliance and
architecture.
NOTE. hot-dip aluminum-silicon alloy coated steel sheet and strip is also known as hot-
dip aluminum steel sheet and strip.
2 Normative References
The following documents are indispensable to the application of this Standard. In terms
of references with a specified date, only versions with a specified date are applicable
to this Standard. The latest version (including all the modifications) of references
without a specified date is applicable to this Standard.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy - Determination of Aluminum Content - Chrom 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 223.17 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 223.59 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 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy - The Potassium
Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of
Sulfur Content
GB/T 223.69 Iron, Steel and Alloy - Determination of Carbon Contents - Gas-volumetric
Method after Combustion in the Pipe Furnace
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 Metallic Materials - Tensile Testing - Part 1. Method of Test at Room
Temperature
GB/T 232 Metallic Materials - Bend Test
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel
Plates (sheets) and Strips
GB/T 2518 Continuously Hot-dip Zinc-coated Steel Sheet and Strip
GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and Test
Pieces for Mechanical Testing
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric
Analysis of Carbon and Low-alloy Steel (routine method)
GB/T 5027 Metallic Materials - Sheet and Strip - Determination of Plastic Strain Ratio
(r value)
GB/T 5028 Metallic Materials - Sheet and Strip - Determination of Tensile Strain
Hardening Exponent (n value)
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement
of Limiting Values
GB/T 16597 Analytical Methods of Metallurgical Products - General Rule for X-ray
Fluorescence Spectrometric Methods
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
GB/T 20066 Steel and Steel - Sampling and Preparation of Samples for the
Determination of Chemical Composition
GB/T 20123 Steel and Steel - 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 25052-2010 Continuously Hot-dip Coated Steel Sheet and Strip - Tolerances on
Dimensions Shape and Weight
3 Terms and Definitions
The following terms and definitions, and terms and definitions that are defined in GB/T
2518 are applicable to this document.
3.1 Hot-dip Aluminum-silicon Alloy Coating
Hot-dip aluminum-silicon alloy coating refers to coating, which is obtained on the
production line of hot-dip aluminum-silicon by immersing preprocessed steel strip into
melt plating solution, whose silicon content is 5% ~ 11%, whose impurity element,
excluding iron, is not more than 1%, whose margin is aluminum.
3.2 Passivation
Passivation refers to a technique of implementing chromic acid passivation or
chromium-free passivation chemical treatment of the surface of steel sheet or strip to
prevent it from generating white rust during the shipment, storage and transportation
process.
3.3 Skin-passing
Skin-passing refers to a technique of implementing mild cold rolling of hot-dip
aluminum-silicon sheet.
NOTE. skin-passing has several objectives as follows.
a) Improve surface smoothness and appearance, however, this process would
have adverse influence on substrate’s plasticity;
b) Temporarily reduce tensile deformation or wrinkles that would emerge during
cold-rolled substrate; if the second letter is D, it represents that it is stipulated
to be hot-rolled substrate.
2) S. it represents structural steel.
b) Steel grade code (or serial number).
1) 51~ 55. 2 figures, it represents the serial number of steel grade.
2) 250 ~ 350. 3 figures, it represents steel grade code; in accordance with
different nameplate naming methods, it is generally the minimum stipulated
yield strength value.
c) Steel grade characteristics G represents that steel grade characteristics are not
stipulated.
d) Hot-dipping code is represented as D.
e) Coating type code is represented as AS.
4.2.2 Steel nameplate for hot stamping shall be constituted of two parts, namely,
naming by chemical composition and coating type code (AS); they shall be linked up
with “+”.
Example 1. DX53D+AS---represents that product is for the purpose of cold forming; the
rolling state of substrate is not stipulated; steel grade serial number is 53; hot-
dip aluminum-silicon alloy coated product.
Example 2. S350GD+AS---represents that product is for structural purpose; the minimum
stipulated yield strength value is 350 MPa; steel grade characteristics are not
stipulated; hot-dip aluminum-silicon alloy coated product.
Example 3. 22MnB5+AS---represents that steel’s chemical composition is 22MnB5; hot-
dip aluminum-silicon alloy coated product.
5 Order Content
5.1 Order Information
5.1.1 Contract and order that comply with this Standard shall include the following
content.
a) Standard No.;
b) Product name (steel sheet or strip);
c) Nameplate;
d) Coating weight;
e) Surface quality;
f) Surface treatment;
g) Specification and dimensional accuracy;
h) Unevenness accuracy;
i) Internal diameter and maximum weight of steel coil;
j) Weight;
k) Mode of packaging;
l) Other special requirements.
5.1.2 If it is not indicated in order contract, deliver products in accordance with the
ordinary dimension (thickness and width) and unevenness accuracy; surface quality
grade FA; surface treatment. chromic acid passivation C; steel coil shall be delivered
in accordance with the internal diameter of 610 mm. Package in accordance with the
mode of packaging provided by the supply side.
5.2 Example of Marking
DX51D+AS steel strip provided in accordance with this Standard. coating weight code
150; surface quality FB; surface treatment. chromic acid passivation and oiling CO;
thickness 1.0 mm; high-grade thickness accuracy PT.B; width 1,250 mm; ordinary
grade width accuracy PW.A.
Example.
6 Dimension, Appearance and Weight
6.1 Nominal Dimension
Please refer to Table 4 for the general nominal dimension of steel sheet and strip.
Through the negotiation between the demand side and the supply side, other
dimensions of steel sheet and strip can also be provided.
6.2 Dimension, Appearance, Weight and Allowable Deviation
The dimension, appearance, weight and allowable deviation of steel sheet and strip
shall comply with the stipulation in GB/T 25052-2010. The allowable deviation of the
thickness of hot stamping formed steel shall comply with the stipulation in Table 3 in
Appendix B
(Normative)
Method of Al-Fe-Si Alloy Coating Weight Measurement
B.1 Overview
This method shall be adopted to measure the weight of alloy coating of aluminum-
silicon coated steel sheet. Firstly, peel off the non-alloy coating. Then, comply with the
method in Appendix C or Appendix D to peel off the alloy coating. Take sponge tin,
which is generated through the reaction of aluminum and stannous chloride solution
(II), as the foundation. This solution shall not trigger reaction with alloy or iron-based
materials. Before and after eliminating the alloy coating, weigh the sample.
B.2 Reagents
B.2.1 Stannous chloride solution (II)
B.2.1.1 Weigh-take 1,000 g of chemically purity SnCl2XH2O; dissolve it in 500 mL
hydrochloric acid (1+1). Add 5 g ~ 10 g of metallic tin (≥ 99.5%), then, heat it up till the
solution becomes bright; dilute to 1,000 mL.
B.2.1.2 Transfer-take 20 mL of solution (B.2.1.1), place it into 200 mL distilled water or
deionized water, then, prepare the working solution.
B.3 Procedure
B.3.1 Remove non-alloy coating
Use petroleum ether to clean the sample, which is taken in accordance with No. 6 in
Table 12, then, impregnate it into 200 mL working solution (B.2.1.2), till the reaction
stops. After taking the sample out of the solution, use small spatula to scrape the
sponge tin. Next, repeat this process, till there is no reaction. Then, clean and dry the
sample.
B.3.2 Determine alloy coating
In accordance with the stipulation in C.3.2 and D.3.2, handle the sample, which is
prepared in accordance with B.3.1.
B.4 Evaluation
Before and after the test, calculate the weight difference of the sample in accordance
with Formula (C.1) or Formula (D.1), obtain the weight of the alloy coating.
Appendix C
(Normative)
Measurement of Coating Weight, Sodium Hydroxide - Hydrochloric Acid-
Hexamethylenetetramine Exfoliation Weight Method
C.1 Principle
Dissolve aluminum-silicon alloy coating with already known surface area into a test
solution that has effect of corrosion inhibition. Weigh the sample before and after the
dissolution of the coating. In accordance with the weighed difference and the sample
area, calculate the weight of aluminum-silicon alloy coating in a unit area.
C.2 Reagents
C.2.1 Hexamethylenetetramine hydrochloride solution. weigh-take 0.35 g of chemically
pure hexamethylenetetramine, then, dissolve it into 50 mL hydrochloric acid (=1.19
g/mL). Use distilled water or deionized water to dilute it into 100 mL.
C.2.2 Sodium hydroxide solution, 20%. weigh-take 20 g of chemically pure sodium
hydroxide, then, dissolve it into 80 mL distilled water or deionized water.
C.3 Test Procedure
C.3.1 Sample
In accordance with the requirement in No. 6 in Table 12, prepare analytical sample.
The sample shall be clean. If necessary, use appropriate solvent that would not corrode
the coating to clean the sample. Immediately place it into chemically pure absolute
ethanol to clean it, then, thoroughly dry it.
C.3.2 Test method
Weigh-take sample (C.3.1), accurate to 0.001 g, then, place it into sodium hydroxide
solution (C.2.2) whose temperature is not lower than 85 °C, till the reaction stops. Then,
take out the sample; use water to rinse it.
Immediately impregnate the wet sample into hexamethylenetetramine hydrochloride
solution (C.2.1). After hydrogen is severely generated in the preliminary stage, when
small bubbles began to emerge, take out the sample, then, use water to rinse it. After
rinsing it, thoroughly dry it. Re-weigh the sample, accurate to 0.001 g.
C.4 Calculation of Analytical Result
The weight of product’s double-sided coating shall be calculated in accordance with
Appendix D
(Normative)
Measurement of Coating Weight, Sodium Hydroxide - Hydrochloric Acid
Exfoliation Weight Method
D.1 Principle
Dissolve aluminum-silicon alloy coating with already known surface area into a test
solution. Weigh the sample before and after the dissolution of the coating. In
accordance with the weighed difference and the sample area, calculate the weight of
aluminum-silicon alloy coating in a unit area.
D.2 Reagents
D.2.1 Hydrochloric acid (=1.19 g/mL).
D.2.2 Sodium hydroxide solution, 20%. weigh-take 20 g of chemically pure sodium
hydroxide, then, dissolve it into 80 mL distilled water or deionized water.
D.3 Test Procedure
D.3.1 Sample
In accordance with the requirement in No. 6 in Table 12, prepare analytical sample.
The sample shall be clean. If necessary, use appropriate solvent that would not corrode
the coating to clean the sample. Immediately place it into chemically pure absolute
ethanol to clean it, then, thoroughly dry it.
D.3.2 Test method
Weigh-take sample (D.3.1), accurate to 0.001 g, then, place it into hot sodium
hydroxide solution (D.2.2), till the reaction stops. Take out the sample, then, use water
to rinse it. Use cloth to wipe it clean, then, place it into hydrochloric acid (D.2.1) at room
temperature for 2 s ~ 3 s.
Continue to use water to rinse the sample, then, re-impregnate it into sodium hydroxide
solution, till it is confirmed that there is no reaction.
Repeat the above procedure, till there is no visible reaction when the sample is
impregnated in the sodium hydroxide solution. Clean the sample, then, thoroughly dry
it. Re-weigh the sample, accurate to 0.001 g.
D.4 Calculation of Analytical Result
Appendix E
(Normative)
Measurement of Coating Weight, X-ray Fluorescence Method
E.1 Scope of Application
This method of measurement specifies the principle, test instrument, calibration curve
drawing, correction and the procedure of measuring the weight of surface aluminum-
silicon alloy coating of steel sheet and strip through X-ray fluorescence.
E.2 Principle
Utilize primary ray that is emitted from a ray source (X-ray tube) to irradiate steel sheet
sample that has metal coating. Under certain conditions, in metal coating, trigger iron
fluorescent X-ray of the coating metal; detect the intensity of the sample’s fluorescent
X-ray. Compare the sample’s X-ray intensity with a sample’s X-ray intensity under
another already known coating weight; determine the coating weight of the sample.
E.3 Test Instrument
E.3.1 Dispersive X-ray fluorescence spectrometer. X-ray fluorescence spectrometer
shall manifest satisfying stability and sensitivity; it shall be able to distinguish
fluorescent X-ray, which is generated from coating and matrix.
E.3.2 Instrument’s working environment shall comply with the stipulation in GB/T
16597. It shall be placed in a place where there are no electromagnetic interference,
vibration or gas corrosion. The control of temperature and humidity shall comply with
the configuration requested by instrument. Generally speaking, within 8 h, temperature
difference shall not exceed ± 2 °C; relative humidity shall be below 70%.
E.3.3 Fluorescent X-ray, which is to be tested, shall be the primary ray of FeK
(wavelength. 0.194 nm) or the primary ray of FeK(wavelength. 0.176 nm).
E.4 Calibration Curve Drawing and Correction
E.4.1 Calibration curve drawing
Please see the drawing of working curve as follows. As an alternative plan of sampling,
which is needed to determine the coating weight of X-ray measurement sample,
coating weight can be determined through the sample after X-ray intensity
measurement in accordance with Appendix C or Appendix D.
a) In order to draw the working curve, extract two groups of samples. one group
shall be adopted as X-ray measurement sample; the other group shall be
adopted to determine the coating weight of X-ray measurement sample. The
......
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