GB/T 33241: Evolution and historical versions
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Zinc-aluminum alloy coating section steel
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GB/T 33241-2025
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| GB/T 33241-2016 | English | 150 |
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Zinc-Aluminum Alloy Coated Section Steel
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Basic data | Standard ID | GB/T 33241-2025 (GB/T33241-2025) | | Description (Translated English) | Zinc-aluminum alloy coating section steel | | Sector / Industry | National Standard (Recommended) | | Date of Implementation | 2026-03-01 | | Older Standard (superseded by this standard) | GB/T 33241-2016 | GB/T 33241-2016: Zinc-Aluminum Alloy Coated Section Steel---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Zinc-aluminum alloy coated section steel
ICS 77.140.70
H44
National Standards of People's Republic of China
Zinc-aluminum alloy coated steel
Released on December 13,.2016
2017-11-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Xiamen New Steel Metal Products Co., Ltd., Xiamen Baofei Dadaoqiao New Technology Co., Ltd., Metallurgical Industry Information Standard
Zhun Research Institute, Fujian Haixi Protection New Materials Joint Research Institute Co., Ltd., Xiamen Xinning Steel Co., Ltd.
The main drafters of this standard. Zheng Yufei, Zheng Yi, Liu Ge, Zheng Yi, Wang Yuxi, Zheng Long, Zheng Jianwei.
Zinc-aluminum alloy coated steel
1 Scope
This standard specifies the terms and definitions, code numbers, models and examples of zinc-aluminum alloy coated steel, ordering content, technical requirements, test methods,
Inspection rules, packaging, marking, quality certificates, handling, stacking and storage.
This standard is applicable to the section steel (hereinafter referred to as profile steel) of the hot-rolled steel galvanized aluminum alloy layer by continuous hot dip plating.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 470 zinc ingot
GB/T 706 hot rolled steel
General provisions for GB/T 2101 steel acceptance, packaging, marking and quality certificates
GB/T 3082-2008 Hot-dip galvanized or hot-dip galvanized-5% aluminum-mixed rare earth alloy coated low carbon steel wire for armored cable
GB/T 4956 magnetic substrate on non-magnetic covering layer thickness measurement magnetic method
GB/T 6462 metal and oxide coating thickness measurement microscopy
GB/T 9793 thermal spray metal and other inorganic coatings zinc, aluminum and their alloys
GB/T 11263 hot rolled H-beam and split T-beam
GB/T 13825 metal coating ferrous metal material hot-dip galvanized layer unit area mass weighing method
Numerical correction of YB/T 081 metallurgical technical standard and determination of test value
YS/T 310 zinc alloy ingot for hot plating
HG/T 3668 zinc-rich primer
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Zinc-aluminum alloy coating hotdipzinc-aluminumaloycoating
The pretreated steel is immersed in a molten zinc aluminum alloy bath to form a zinc aluminum and/or zinc aluminum iron alloy coating on the surface thereof.
3.2
Plating quality coatingmass
The mass of the zinc-aluminum alloy coating per unit area on the surface of the steel is expressed in g/m2.
3.3
Leakage plating uncoatedareas
The area where the surface of the section steel does not react with the molten zinc-aluminum alloy.
4 code, model and example
4.1 Code
The steel is coded ZA (Z for Zn and A for Al).
4.2 Model
The model of zinc-aluminum steel is composed of steel type and steel specifications. Expressed as follows.
Steel type
Steel specification, in millimeters (mm)
4.3 Example
The zinc-aluminum alloy coated H-shaped steel with the specification of 300mm×300mm×10mm×15mm is represented by.
ZAHM300×300×10×15
5 Ordering content
Contracts ordered under this standard shall include the following main contents.
a) product name;
b) the standard number;
c) profile steel specifications;
d) weight or quantity;
e) Special requirements.
6 Technical requirements
6.1 Materials
6.1.1 Steel base metal
The steel base metal should meet the requirements of GB/T 706 or GB/T 11263.
6.1.2 Zinc-aluminum alloy ingot
The chemical composition of zinc-aluminum alloy ingots shall comply with the requirements of YS/T 310.
6.1.3 Zinc ingot
Zinc ingots shall comply with the provisions of GB/T 470.
6.2 Plating
6.2.1 Appearance
6.2.1.1 The surface of the coating shall be smooth and shall not have defects such as peeling, plating, zinc thorn, dripping and slagging.
6.2.1.2 A small amount of white rust on the surface of the steel (white or gray corrosion products based on basic zinc oxide) should not be used as a reason for rejection.
6.2.2 Plating quality and coating thickness
The quality of the steel coating and the thickness of the coating shall comply with the requirements of Table 1.
Table 1 Steel coating quality and coating thickness
Plating
Plating quality/(g/m2)
not less than
Coating thickness/μm
not less than
Zinc-0.25% aluminum alloy 360 40
Note 1. The requirements for plating quality and coating thickness do not include areas that are repaired due to plating defects or breakage.
Note 2. The thickness of the zinc-0.25% aluminum alloy coating listed in the table is calculated according to 7.14g/m2=1μm. Due to factors such as differences in aluminum content in the coating
The coating density is not the same, so the coating thickness is only a reference value and is not a basis for delivery.
6.2.3 Plating aluminum content
For zinc-0.25% aluminum alloy coating, the aluminum content in the coating should be 0.1%~0.5%. After consultation between the supplier and the buyer and indicated in the contract,
Provides other profiles of aluminum-coated steel.
6.2.4 Coating adhesion
Profile steel shall not exhibit peeling and peeling of the coating under normal working conditions.
Note. The peeling and peeling of the coating caused by bending and deformation after galvanizing aluminum does not mean that the adhesion of the coating is not good.
6.3 Leak plating and repair
6.3.1 Leakage plating
The total area of the steel leakage plating surface shall not exceed 0.5% of the total surface area of the part (excluding the cutting part). The area of each missing plating surface should not
More than 1cm2, the leakage plating surface should be repaired. When there is no other agreement between the supplier and the buyer, if the plating area is larger than the above specified value, these parts should be given
Replating.
6.3.2 Repair
If there is a missing plating surface on the surface of the steel, the plating surface should be repaired by coating with zinc-rich paint or hot-sprayed zinc alloy. repair
The thickness of the plating in the area should generally be more than 30 μm thicker than the thickness specified in 6.2.2. Before the repair, the scale of the leaking area should be removed.
And other contaminants, or other pre-treatment methods to ensure adhesion between the repair layer and the substrate. If repaired with a zinc-rich primer,
It shall be carried out in accordance with the requirements of HG/T 3668; if it is repaired by thermal spraying zinc alloy, it shall be carried out in accordance with the requirements of GB/T 9793.
7 Test methods
7.1 Inspection items
The inspection items, sampling quantities, sampling methods and test methods for each batch of steel shall comply with the requirements of Table 2.
Table 2 Inspection items, sampling quantities, sampling methods and test methods
Serial number test item sampling quantity sampling part test method
1 appearance by root - 7.3.1
2 plating quality 3 different branches 7.3.2
3 The aluminum content in the coating is 6 different branches 7.3.3
The mechanical properties and bending properties of the coated steel should meet the requirements of GB/T 706, GB/T 11263 and other related standards. When necessary, these items should be
Line inspection.
7.2 Plating inspection
7.2.1 Appearance test
Visual inspection under normal lighting conditions using corrected vision.
7.2.2 Coating quality and coating thickness test
7.2.2.1 Weighing method
According to the requirements of GB/T 13825.
7.2.2.2 Magnetic method
According to the requirements of GB/T 4956. When testing, the test points should be evenly distributed, with at least 5 recorded values per side, and the distance from the edge is not less than
10mm. The test point record value can be increased according to the product specifications.
7.2.2.3 Cross section method
According to the requirements of GB/T 6462.
7.2.3 Aluminum content in the coating
Inspection shall be carried out in accordance with the provisions of Appendix A of GB/T 3082-2008.
7.2.4 Adhesion test
As long as the adhesion of the coating to the substrate can meet the requirements of the part under normal use and general operating conditions, it is usually not necessary to specifically test the coating and
The bonding force between the substrates. If the buyer has special requirements, the test method for adhesion may be determined by both the supplier and the buyer.
8 Inspection rules
8.1 Inspection and acceptance
Inspection and acceptance of steel sections are carried out by the supplier quality supervision department. The acquirer has the right to conduct any inspection item specified in this standard or contract.
Inspection and acceptance.
8.2 Group Batch Rules
Steel sections should be accepted in batches. Each batch consists of sections of the same size and size. Each batch is no more than 60t.
8.3 Sampling location and number of samples
The sampling location and sampling quantity of each batch of steel shall comply with the requirements of Table 2.
8.4 Re-inspection and judgment
The re-inspection and determination of steel sections shall comply with the provisions of GB/T 2101.
8.5 Numerical repair
The numerical rounding shall comply with the provisions of YB/T 081.
9 Packaging, marking, quality certificate, handling, stacking and storage
9.1 Packaging
9.1.1 The bundled steel frame, the connection form of the bolt, or the strapping type of the bundle shall be pre-treated. Steel bundle
The ends are neat, the layers are distinct, and the thickness is basically the same. The packaging should be firm to ensure that the bales are not loose during transportation, avoiding between steel profiles and sections.
Rubbing against the package and damaging the coating.
9.1.2 In addition to the provisions of 9.1.1, the packaging of steel sections shall comply with the provisions of GB/T 2101.
9.2 Mark and quality certificate
The steel sign and quality certificate shall comply with the provisions of GB/T 2101.
9.3 Handling, stacking and storage
Handling, stacking and storage of steel should pay attention to loading and unloading and place, and the package should not be damaged to deform the product or damage the coating.
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