Zinc aluminum magnesium roll

Product Standards  

The product standards for zinc-aluminum-magnesium coils mainly refer to the following two national standards:
GB/T 3277-2015 "Aluminum-magnesium alloy coated steel wire rope for galvanized steel wire rope": This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, and transportation of aluminum-magnesium alloy coated steel wire rope, but mainly focuses on the aluminum-magnesium alloy coating used for galvanized steel wire rope, which is not completely consistent with zinc-aluminum-magnesium coils. However, some testing methods and index setting ideas have certain reference value.
QB/T 4953-2017 "Zinc-aluminum-magnesium alloy coated steel sheet and strip": This is an important standard for zinc-aluminum-magnesium alloy coated steel sheet and strip, specifying its technical requirements, test methods, inspection rules, marking, packaging, and transportation. It includes regulations on zinc-aluminum-magnesium technical indicators, such as the amount of zinc, aluminum, and magnesium, the zinc-aluminum ratio, coating thickness, adhesion, and corrosion resistance.
In addition, regarding the application of zinc-aluminum-magnesium products in the highway guardrail field, there is also the group standard T/CECS 10434-2024 "Steel strip with continuous hot-dip zinc-aluminum-magnesium alloy coating for highway guardrails", which came into effect on May 1, 2025, providing technical support and normative basis for the application of zinc-aluminum-magnesium alloy coated steel sheets in the highway and bridge industries.

Usage

Construction field: Widely used in roofs, walls, steel structures, etc. For example, in ordinary residential houses and industrial plants, it can be used as roof panels and exterior wall panels, providing lasting protection; in coastal areas or areas with heavy industrial pollution, its strong corrosion resistance can effectively resist corrosion from chloride ions and sulfur dioxide; it is also suitable for steel structures such as keel ceilings, perforated plates, and cable trays in buildings.
Agricultural field: It can be used to construct steel structures and steel components for agricultural breeding sheds and greenhouses, meeting the special requirements of the livestock industry for materials in humid and chemically corrosive environments.
Automotive industry: It can be used for automotive body panels, helping to improve the overall strength and rigidity of automobiles. Some high-end automotive panel manufacturers have begun producing zinc-aluminum-magnesium automotive panels.
Power and communication field: Used in power transformers, capacitors, and other equipment, as well as high and low voltage switchgears, and box-type substations, etc. Due to its good corrosion resistance and strength, it can ensure the stable operation of equipment in outdoor environments.
Railway transportation field: Used in vehicle exterior cladding, doors, etc., to improve the performance and service life of railway vehicles.
Photovoltaic industry: Widely used in the photovoltaic field, such as photovoltaic brackets and battery panel frames. Its weather resistance and corrosion resistance are good, and it can adapt to harsh environments such as coastal areas and deserts, reducing the risk of bracket failure due to corrosion and ensuring the stable operation and long-term benefits of the photovoltaic system.

Product Introduction  

Zinc-aluminum-magnesium coil is a new type of environmentally friendly metal material, usually composed of zinc, aluminum, and magnesium as the main alloy coating elements, attached to steel sheets or strips through hot-dipping and other processes. It has the following characteristics:
High corrosion resistance: The addition of magnesium in the coating promotes the formation of a dense oxide film, with corrosion resistance 5-10 times higher than that of ordinary hot-dip galvanized steel sheets, reaching stainless steel standards. It performs excellently in salt spray tests, with a service life of more than 30 years, suitable for high salt spray, high humidity, and industrial pollution environments.
Self-healing function at the cut: After cutting or scratching, the alloy elements in the coating will dissolve to form protective films such as zinc hydroxide and magnesium hydroxide, covering the cut and inhibiting the formation of red rust, which can significantly extend the service life of the material in complex environments.
Excellent processing performance: It has good bending, stamping, and welding performance, meeting the forming needs of complex components. The coating is denser than ordinary galvanized sheets and is not easy to peel off during stamping processing. The surface coating has strong adhesion and can be directly sprayed or laminated.
Environmental protection and economy: The coating does not contain harmful substances such as chromium and complies with environmental protection standards such as the ROHS directive. At the same time, the coating thickness is relatively thin, usually 40-275g/m², which can reduce resource consumption, extend service life, and thus reduce the life-cycle cost.
 

National Standards

The two national standards mentioned above standardize the relevant indicators of zinc-aluminum-magnesium coils.
QB/T 4953-2017: Specifies various technical indicators for zinc-aluminum-magnesium alloy coated steel sheets and strips. In terms of chemical composition, it clarifies the content range of zinc, aluminum, and magnesium, and the zinc-aluminum ratio; for coating thickness, there are corresponding regulations according to different usage requirements; in terms of performance, there are strict testing methods and judgment standards for adhesion and corrosion resistance. For example, the corrosion resistance is tested by methods such as neutral salt spray test, requiring a certain number of hours without red rust.
GB/T 3277-2015: Although mainly aimed at aluminum-magnesium alloy coated steel wire ropes for galvanized steel wire ropes, it has certain reference significance for zinc-aluminum-magnesium coils in some testing methods and basic alloy composition requirements, such as the content range of aluminum and magnesium elements in the alloy, to ensure the performance of the coating.