Galvalume steel sheet & coil is also called Aluminum-Zinc Alloy Coated Steel, Zincalume steel, aluminized zinc steel (aluzinc steel), SGLC, The galvalume metal is composed of 55% aluminium, 43.4% zinc and 1.6% silicon solidified at 600 ~C. Its whole structure consists of aluminium-iron-silicon-zinc, forming a compact quaternary crystal alloy. The surface of the Galvalume steel sheet & coil is characterized by smooth, flat and gorgeous stars, and its base color is silver white. The special coating structure makes it have excellent corrosion resistance. The normal service life of galvalume steel sheet is up to 25a, and its heat resistance is good. It can be used in high temperature environment at 315 C. The adhesion between coating and paint film is good, and it has good processing performance. It can be punched, sheared and welded. The surface conductivity is very good.
The surface of the galvalume steel sheet & coil is smooth, flat and gorgeous with star flowers, and the base color is silvery white. The special coating structure makes it have excellent corrosion resistance. The normal service life of the galvalume steel sheet & coil can reach 25a, the heat resistance is very good, and it can be used in a high temperature environment of 315°C; the adhesion between the coating and the paint film is good, and it has good processing performance, and can be stamped, cut, welded, etc. ; Surface conductivity is very good.
Layer Schematic of Galvalume Steel
Production Process of Hot-dip Al-Zn Coating
Step 1:
Pre-treatment: After the cold-rolled coil arrives in the galvalume workshop, after passing through the uncoiler, through the degreasing section and the reduction furnace, the steel coil is cleaned and its components are reduced to the extent that it can be galvanized.
Step 2:
Central section: The most critical technology is this step. After passing through the zinc pot, a layer of zinc layer is plated on the surface of the steel plate. After coming out of the zinc pot, it is cooled and shaped by the cooling tower.
Step 3:
Post-processing: The steel plate finally comes to the post-processing stage after various processes. After finishing, straightening and passivation, and finally coiling.
Characteristics of Galvalume Steel Sheet & Coil
Machinability
It can satisfy the processing requirements of rolling, coiling and others processes alike.
2.Thermal resistance
Common HDG steel plate normally works under 230℃, and has its color changed at 250℃, however, Galvalume steel plate cansustain the environment at 315℃ for long time.
3.High reflectivity
Reflection ability of heat and light is twice as much as those ofhot-dip zinc steel sheet, and its reflectivity is more than 0.70, exceeding 0.65 (required by the EPA Energy Star Standard), which is an ideal construction materials of saving energy.
4.Resistance to corrosion
Al-Zn coated steel sheet has better performance in corrosion resistance than GI sheet of the same thickness and its service life is 2-6 times longer than general GI sheet.
The use of galvalume steel sheet & coil
1.Appliances Industry
Outer clad sheets for washing machine, refrigerator, television, air conditioner and ventilation system, explosion-proof strip, solar water heater and appliance parts.
2.Industrial Instruments
Electric control cabinet, industrial refrigeration equipment, automatic vending machine.
3.Architecture
Roofs and outside walls of civilian and industrial buildings, garage doors, fencings and window blinds.
4.Agriculture
Piggery, chicken coop, granary, greenhouse pipes, etc.
5.Other
Muffler, heat shields of exhaust pipe and catalytic converter, auto parts & accessories under the frame, signboard in highway.
As a new type of building material, galvalume steel sheet & coil are constantly improving through research and development technology, and strive to achieve high-quality performance delivered to meet customer requirements. With the development of technology, the application prospect of galvalume steel sheet & coil in the construction industry will become wider and wider, and it will also provide more possibilities for the construction industry.
In China, the standards for Galvalume steel sheet and coil are established and regulated by the Chinese National Standards (GB/T) issued by the Standardization Administration of China (SAC). The relevant GB/T standard for Galvalume steel is:
GB/T 2518-2019: Continuous hot-dip zinc-coated steel sheets and coils.
While the specific term "Galvalume" may not be used in the standard's title, GB/T 2518-2019 covers the requirements for continuously hot-dip zinc-coated (galvanized) steel sheets and coils. The Galvalume steel, with its aluminum-zinc alloy coating, can fall under this standard as it is a type of continuous hot-dip coating process like traditional galvanized steel.
Manufacturers in China often produce Galvalume steel following the requirements of GB/T 2518-2019 to ensure that their products meet the necessary quality and safety standards for the market.
In the United States, the standards for Galvalume steel sheet and coil are set and maintained by several organizations. The most commonly referenced standards are those established by the American Society for Testing and Materials (ASTM) and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). The relevant ASTM standard for Galvalume steel is:
ASTM A792/A792M: Standard Specification for Steel Sheet, 55% Aluminum-Zinc Alloy-Coated by the Hot-Dip Process.
This ASTM standard specifies the requirements for 55% aluminum-zinc alloy-coated steel sheets and coils produced by the hot-dip process. The coating composition is approximately 55% aluminum, 43.5% zinc, and 1.5% silicon by weight.
The standard covers the mechanical properties, chemical composition, coating weight, thickness, and other performance characteristics of Galvalume steel. It is widely used in the construction industry for roofing, siding, and other applications where corrosion resistance and durability are essential.
Manufacturers of Galvalume steel sheet and coil in the US typically follow ASTM A792/A792M to ensure the quality and consistency of their products.
In the United Kingdom, the standards for Galvalume steel sheet and coil are generally aligned with the European standards set by the European Committee for Standardization (CEN). The most relevant European standard for Galvalume steel is:
EN 10346: Continuously hot-dip coated steel flat products for cold forming - Technical delivery conditions.
EN 10346 is the European standard that covers the requirements for continuously hot-dip coated steel flat products with zinc (Z), zinc-iron alloy (ZF), zinc-aluminum alloy (ZA), aluminum-zinc alloy (AZ), or aluminum-silicon alloy (AS) coatings. The Galvalume steel, with its aluminum-zinc alloy coating, falls under the AZ category in this standard.
EN 10346 specifies the mechanical properties, chemical composition, coating weight, thickness tolerances, and other performance characteristics of Galvalume steel and other types of coated steel. It is used as the basis for product certification and quality assurance in the European market.
Manufacturers and suppliers of Galvalume steel in the UK would typically follow EN 10346 to ensure their products meet the required quality and safety standards.
Besides EN 10346, other standards from the British Standards Institution (BSI) or other European standards may also be relevant, depending on the specific application or industry. These standards are often harmonized across the European Union to facilitate trade and ensure consistent product quality.
In Japan, the standards for Galvalume steel sheet and coil are established and maintained by the Japanese Industrial Standards (JIS). The relevant JIS standard for Galvalume steel is:
JIS G 3321: Hot-dip 55% aluminum-zinc alloy-coated steel sheets and coils.
JIS G 3321 specifies the requirements for 55% aluminum-zinc alloy-coated steel sheets and coils produced by the hot-dip process. The coating composition is approximately 55% aluminum, 43.5% zinc, and 1.5% silicon by weight, which is commonly known as Galvalume or Zincalume.
This standard covers the mechanical properties, chemical composition, coating weight, thickness, and other performance characteristics of Galvalume steel. It is widely used in various industries in Japan, including construction, automotive, and manufacturing, due to its excellent corrosion resistance and durability.
Manufacturers of Galvalume steel sheet and coil in Japan adhere to JIS G 3321 to ensure the quality and consistency of their products. The standard is regularly updated to reflect advancements in technology and industry best practices.
