GB/T 13448-2019 PDF English
US$605.00 · In stock · Download in 9 secondsGB/T 13448-2019: Test methods for prepainted steel sheet and strip Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 13448: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 13448-2019 | English | 605 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Test methods for prepainted steel sheet and strip
| Valid |
| GB/T 13448-2006 | English | 150 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Test methods for prepainted steel sheet
| Obsolete |
| GB/T 13448-1992 | English | 599 |
Add to Cart
|
4 days
|
Test methods for colour-coated steel plates and strips
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 13448-2019
GB/T 13448-2019: Test methods for prepainted 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/GBT13448-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.060
H 25
Replacing GB/T 13448-2006
Test methods for prepainted steel sheet and strip
Issued on. MARCH 25, 2019
Implemented on. FEBRUARY 01, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 4
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 7
4 Coating thickness determination... 9
5 Specular gloss determination... 15
6 Chromatic aberration determination... 17
7 Bending test... 19
8 Reverse impact test... 22
9 Pencil hardness test... 24
10 Organic solvent resistance test... 26
11 Abrasion resistance test... 29
12 Scratch resistance test... 31
13 Cross-cut test... 33
14 Cupping test... 35
15 Surface resistivity test... 37
16 Coating contact angle test... 38
17 Water immersion test... 40
18 Acid and alkali resistance test... 42
19 Contamination resistance test... 44
20 Carbon black contamination test... 47
21 Neutral salt spray test... 48
22 Dry heat resistance test... 51
23 Damp heat resistance test... 54
24 Cyclic corrosion test... 56
25 Xenon accelerated aging test... 59
26 UV lamp accelerated aging test... 62
27 Atmospheric exposure test... 65
Annex A (normative) Prepainted sheets’ coating peeling method and plating
thickness measuring method... 69
Annex B (informative) Knoop hardness range of Zhonghua 505 coil steel
coating hardness test pencils and its corresponding relationship with Knoop
hardness of Zhonghua 101 drawing pencils... 70
1 Scope
This Standard specifies terms and definitions of prepainted steel sheets and
steel strips, as well as related test methods, test reports, etc.
This Standard is applicable to the determination and evaluation of the coating
properties of prepainted steel sheets and strips (hereinafter referred to as
prepainted sheets).
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 1410 Methods of test for volume resistivity and surface resistivity of
solid electrical insulating materials
GB/T 1766 Paints and varnishes - Rating schemes of degradation of coats
GB/T 1839 Test method for gravimetric determination of the mass per unit
area of galvanized coatings on steel products
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 12754 Prepainted steel sheet
GB/T 30693 Measurement of water-contact angle of plastic films
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T
12754 and the following apply.
3.1
specular gloss
Relative luminous reflectance factor of the sample in the direction of specular
reflection.
3.2
relative luminous reflectance factor
Under the same geometric conditions, the ratio of the luminous flux value
reflected by the sample to the luminous flux value reflected by the standard
surface.
3.3
tristimulus values
In a three-color system, the amount of three original stimuli required to achieve
color matching with the light to be measured.
3.4
chromaticity coordinate
Ratio of any tristimulus value to the sum of the tristimulus values.
3.5
T-bend
Carry out the 180° reverse bending test with the radius of curvature of n (n = 0,
1, 2...) times the tested sample’s thickness in turn. The minimum n value at
which the coating does not peel off or crack is the T-bend value.
4 Coating thickness determination
4.1 General
4.1.1 This method is applicable to the determination of the coating thickness of
prepainted sheets.
4.1.2 The following methods can be used to determine the coating thickness of
prepainted sheets.
4.2 Principle
4.2.1 Magnetic thickness gauge method
Using the principle of electromagnetic field magnetoresistance, the coating
thickness is measured by the amount of magnetic flux flowing into the
prepainted steel substrate.
4.2.2 Micrometer method
The coating thickness is determined by measuring the difference in thickness
of the prepainted sheet before and after removal of coating.
4.3 Test equipment and materials
4.3.1 Magnetic thickness gauge
4.3.2 Micrometer
4.3.3 Metallographic microscope
4.4 Sample preparation and test environment
4.4.1 The sample size is not less than 75 mm × 150 mm. The surface of the
sample shall be flat, no oil, no damage, and no burrs on the edges.
4.4.2 The test is carried out in a laboratory environment. In case of dispute, the
sample to be tested shall be placed in an environment with a temperature of
23 °C ± 2 °C and a relative humidity of 50 % ± 5 % for at least 24 h before test.
4.5 Test procedure
4.5.1 Magnetic thickness gauge method
4.5.1.2 Determination
4.5.2 Micrometer method
4.5.2.1 SELECT 3 different parts in the area not less than 10 mm from the edge
of the sample to mark. USE a micrometer to measure the thickness of the marks
and record. Be careful not to make the coating have visible deformations during
operation, otherwise it will affect the measurement results.
4.5.3 Metallographic microscope method
4.5.5 Magnetic-eddy current thickness gauge method
4.5.5.1 Instrument calibration and accuracy verification
4.5.5.2 Determination
4.6 Expression of results
4.6.1 Magnetic thickness gauge method
The arithmetic mean of the coating thicknesses of the 5 different measurement
positions is the coating thickness of the sample, expressed in micrometers (μm).
4.7 Test report
The test report shall include the following.
5 Specular gloss determination
5.1 General
The method is applicable to the determination of specular gloss of the coating
of prepainted sheets.
5.2 Principle
The specular gloss of the sample can be measured by determining the relative
luminous reflectance factor of the coating. The unit of measurement is GU.
5.3 Test equipment and materials
5.5 Test procedure
5.5.1 Instrument calibration and accuracy verification
The gloss meter shall be calibrated in accordance with the provisions of the
equipment instructions.
5.5.2 Measurement
5.6 Expression of results
The arithmetic mean of the coating’s specular gloss of the 3 different
measurement positions, that is the gloss of the sample, in units of GU.
5.7 Test report
The test report shall include the following.
6 Chromatic aberration determination
6.1 General
The method is applicable to the determination of chromatic aberration of
prepainted sheets.
6.2 Principle
MEASURE the spectral data of the reference sample and the sample by the
colorimeter under the International Lighting Association (CIE) standard light
source and standard observation conditions, USE the CIE color system to
calculate the tristimulus values of the reference sample and the sample, and
USE the selected chromaticity coordinates to calculate the chromatic aberration
results of the sample and the reference sample.
6.3 Test equipment and materials
6.3.1 Colorimeter
6.3.2 Colorimeter calibration sheet/sample
Provided by the colorimeter supplier.
6.3.3 Reference sample
A standard swatch approved by both the supply and demand parties. The
reference sample shall be stored in a dark and laboratory environment to avoid
large changes in color that may affect the determination results.
6.4 Sample preparation and test environment
6.4.1 The size of the sample shall meet the requirement that it is able to
covering the measuring aperture of the colorimeter. The surface of the sample
shall be flat, no oil, no damage, and no burrs on the edges.
6.4.2 The test is carried out in the laboratory environment. In case of dispute,
the sample to be tested shall be placed in an environment with a temperature
of 23 °C ± 2 °C and a relative humidity of 50 % ± 5 % for at least 24 h before
test.
6.5 Test procedure
6.6 Expression of results
The chromatic aberration between the sample and the reference sample can
be calculated by formula (1).
6.7 Test report
The test report shall include the following.
7 Bending test
7.1 General
This method is applicable to the evaluation of the ability of the coating to resist
peeling off or cracking when the prepainted sheet is bent.
7.2 Principle
180° bending. The sample is bent 180° around itself to determine whether the
coating has peeled off or cracked, to determine the minimum thickness multiple
value of the sample that does not cause the coating to peel off or crack.
7.3 Test equipment and materials
7.4 Sample preparation and test environment
7.4.1 The sample size is that the width is not less than 100 mm and the length
is about twice the width. The sample shall be flat, no oil, no damage, and no
burrs on the edges.
7.4.2 The test is carried out in a laboratory environment. In case of dispute, the
sample to be tested shall be placed in an environment with a temperature of
23 °C ± 2 °C and a relative humidity of 50 % ± 5 % for at least 24 h before test.
7.5 Test procedure
7.5.1 180° bending
7.5.2 90° bending
7.5.2.1 INSERT one end of the sample into the bending test machine for about
10 mm, PRESS the sample tightly, TURN the handle to bend the sample by
90°.
7.5.3 Negotiation content
It shall be agreed upon between the supply and demand parties on whether the
180° or 90° bending test is used, and whether the bending test result is
determined by tape peeling or by observing the cracking visually or by
magnifying glass.
7.6 Expression of results
The 180° bending test does not cause the coating shedding. The minimum
multiple of the sample thickness at which the cracking is observed visually or
by magnifying glass is the T-bend value. The 90° bending test result is indicated
as pass/fail.
7.7 Test report
The test report shall include the following.
8 Reverse impact test
8.1 General
This method is applicable to the evaluation of the ability of the coating to resist
peeling off or cracking when the prepainted sheet is subjected to rapid
deformation.
8.3 Test equipment and materials
8.4 Sample preparation and test environment
8.4.1 The sample size shall not be less than 75 mm × 150 mm. The sample
shall be flat, no oil, no damage, and no burrs on the edges.
8.4.2 The test is carried out in the laboratory environment. In case of dispute,
the sample to be tested shall be placed in an environment with a temperature
of 23 °C ± 2 °C and a relative humidity of 50 % ± 5 % for at least 24 h before
test.
8.5 Test procedure
8.5.1 Specified impact absorption energy test
8.5.2.1 TEST according to steps 8.5.1.1 to 8.5.1.4.
8.6 Expression of results
8.6.1 In the specified the impact energy absorption test, the result shall be
expressed as whether the coating of the sample is peeled off or cracked under
the specified impact absorption energy test.
8.7 Test report
The test report shall include the following.
9 Pencil hardness test
9.1 General
This method is applicable to determination of pencil hardness of the coating of
prepainted sheets.
9.2 Principle
Use a set of pencils of known hardness to determine the relative hardness of
the coating surface of prepainted sheets.
9.3 Test equipment and materials
9.4 Sample preparation and test environment
9.4.1 The sample size is 75 mm × 150 mm. The surface shall be flat, no oil and
no damage.
9.4.2 The test is carried out in the laboratory environment. In case of dispute,
the sample to be tested shall be placed in an environment with a temperature
of 23 °C ± 2 °C and a relative humidity of 50 % ± 5 % for at least 24 h before
test.
9.5 Test procedure
9.5.1 Manual pencil method
9.5.2 Instrument pencil method
9.6 Expression of results
The hardest pencil hardness by which the coating cannot be plowed at least 4
times out of 5 times is taken as the pencil hardness of the coating to be tested.
9.7 Test report
The test report shall include the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 13448-2019 be delivered?Answer: The full copy PDF of English version of GB/T 13448-2019 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 13448-2019_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 13448-2019_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 13448-2019 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 13448-2019?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 13448-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 13448-2019?A step-by-step guide to download PDF of GB/T 13448-2019_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 13448-2019".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|