Aluminum-zinc alloy coated steel (also known as galvalume steel, GL steel, Aluzinc Steel), metal material covered with a zinc-aluminum alloy layer consisting of 55% aluminum, 43.4% zinc, and 1.6% silicon on the surface of a steel sheet by hot-dip galvanizing, is widely used in the fields of construction, home appliances, automotive, agriculture, and energy because of its superb corrosion resistance, high-temperature resistance, and self-repairing ability.
Aluminum-zinc Alloy Coated Steel for sale
Wanzhi Group produces Aluminum-zinc alloy coated steel by international standards such as ASTM A792 (AZ50, AZ100, AZ150), EN 10346 (DX51D+AZ, DX52D+AZ), and JIS G3321 (SGLD-AZ, SGLD-HAZ). Wanzhi Group can also provide deep processing services such as bending, punching, slitting, molding, etc.
Specifications
Wanzhi Group produces Q195-Q345, SGCC, SGCD1, SGCD2, SGCD3, SGC340, SGC400, SGC440, DX51D, DX52D, DX53D, DX54D, etc., with thickness from 0.15-6mm, width from 600-1250mm, length unlimited, and aluminum-zinc alloy coated steel (GL steel) with 20-350g/㎡ (40-150 microns).
| Material | SGCC,S350GD+Z,S550GD+Z,DX51D,DX52D,DX53D, etc |
|---|---|
| Thickness | 0.12mm-6mm |
| Width | The conventional width below 0.5mm is 1000mm, 1200mm, and above is 1000, 1250mm |
| coil weight | 8-10 tons /customized |
| Tolerance | "+/-0.02 mm |
| Substrate Type | Hot rolled coil, Cold rolled coil |
| Surface structure | Zero spangles, Small spangles, Regular spangles, Big spangles |
| Zinc layer thickness | 30g/㎡-275g/㎡ (Z275/G90) |
| Standard | AISI, ASTM, BS, GB, JIS |
| Implementation standards | GB/T2518 GB/T25052, EN10346, JIS G3302, ASTMA653 |
| Certificates | SGS, ISO 9001,CE |
Properties
Typical composition of the base material (steel)
| Grade | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Fe (%) |
|---|---|---|---|---|---|---|
| Q235 | ≤0.22 | 0.30-0.65 | ≤0.35 | ≤0.045 | ≤0.050 | Balance |
| SPCC | ≤0.12 | 0.25-0.60 | ≤0.10 | ≤0.040 | ≤0.040 | Balance |
Coating composition
| Chemical Composition | Aluminum (Al) | Zinc (Zn) | Silicon (Si) |
|---|---|---|---|
| Content | 55% | 43.4% | 1.6% |
Properties of aluminized zinc-coated steel
| Mechanical Properties | Tensile Strength | Yield Strength | Hardness | High Temperature Resistance |
|---|---|---|---|---|
| Range | 400 – 700 MPa | 400 – 700 MPa | HRB 60-85 | 300°C to 600°C |
Prices of Aluminum-zinc Alloy Coated Steel
Aluminized zinc-coated steel is priced at 600-900 USD per tonne, which is higher than galvanized steel, but the weight and service life of GL steel are lighter, but GL steel is lighter and has a longer service life, making it more cost-effective for long-term projects. The aluminum zinc coated steel price is affected by the grade of substrate, coating, surface treatment, quantity purchased, and other factors. Leave a message to tell us the specification and application of the steel you need, and get a free quote!
Aluminum-zinc Alloy Coated Steel Advantages and Applications
Aluminum-zinc Alloy Coated Steel combines the advantages of steel, zinc and aluminum, with a service life of up to 20-50 years, salt spray resistance of 2-6 times that of GI steel, and resistance to oxidation of up to 315°C (650°C in the short term), making it the metal of choice for medium corrosive environments where high temperature resistance is required. With a resistance to oxidation up to 315°C (short-term resistance up to 650°C), GL steel is the metal of choice for medium corrosive environments where high temperature resistance is required.
Advantages
Applications
Construction industry
- Roofing and walling: industrial plants, logistics warehouses.
- Ventilation ducts: high temperature resistant flue, air conditioning system.
Home Appliances and Automobiles
- Oven/Microwave Oven Shell: High-temperature resistant baking environment.
- Automobile exhaust pipe guard plate: resistance to high temperature oxidation and road salt corrosion.
Agriculture and Energy
- Grain silo roof: moisture and corrosion resistant.
- Solar racking: weather-resistant to match photovoltaic modules.
Aluminum-zinc Alloy Coated Steel Factory Manufacturer
Wanzhi Group is a steel supplier, our coated steel marketing center is located in Zhengzhou City, Henan Province, China (Zhengzhou Wanzhi Material Co. Ltd), factory is located in Binzhou City, Shandong Province, China (Shandong Wanzhi Steel Co. Ltd), provides high quality coated steel solutions (GI GL PPGI, PPGL, ZAM, etc.) for construction and industrial applications.
GL Production Lines
Wanzhi has one aluminum-zinc alloy coated steel production line, two galvanized steel production lines, three PPGI PPGL production lines and one writing board production line, with an annual production capacity of 600,000 tons, and a delivery time of 5–45 days, and we can provide free samples of coated steel with regular specifications.
Production process of Aluminum-zinc Alloy Coated Steel
Certificates
Comparison of different Coated Steels:GI GL ZAM
| Indicators | GI (Galvanized) | GL (Aluminized Zinc) | ZAM (Zinc-Aluminum-Magnesium) |
|---|---|---|---|
| Plating Composition | Pure Zinc (Zn ≥99%) | 55% Al, 43.4% Zn, 1.6% Si | Zn 90-94%, Al 6-10%, Mg 0-3% |
| Strength of Substrate | Ordinary Mild Steel (ReH 140-300 MPa) | Ordinary Mild Steel (ReH 140-300MPa) | 300MPa Available with high strength steel (ReH ≥ 550MPa) |
| Corrosion resistance | Superior to GI, second to ZAM | General | Strongest, especially for harsh environments |
| Corrosion resistance mechanism | Aluminum barrier protection + zinc sacrificial anode | Sacrificial anode protection (zinc preferred for corrosion) | Self-repairing alloy layer + multi-protection |
| Salt spray resistance | 200-400 hrs (Z120 plating) | 600-1500 hrs (AZ150) (Z120 coating) | 1500–3000 hours (ZM150 coating) |
| High temperature resistance | Fair, zinc coating has poor resistance to high temperatures | Excellent, aluminum improves high-temperature resistance | Stronger, magnesium enhances high-temperature resistance |
| Reflectivity | Poor, low reflectivity | Excellent, suitable for energy-efficient building materials | Excellent, suitable for energy-efficient design |
| Processing ductility | Excellent (suitable for deep-drawing, bending) | Good (coating is hard, needs process adjustment) | Medium (high hardness but self-repairing) |
| Cutting corrosion resistance | Poor (high hardness but self-healing) | Medium (aluminum retards corrosion) | Excellent (magnesium promotes self-repair) |
| Appearance | Conventional galvanized steel appearance, rougher surfaces | Smooth, silvery-gray appearance | Bright, smoother coatings |
| Costs | Low | Medium (20-30% higher than GI) | High (40-60% higher than GI) |
Comparison of International Standards
| Standards | Substrate Grade | Mechanical Property Requirements |
|---|---|---|
| ASTM A792 | CS Type B (mild steel) | ReH≥140 MPa, Rm≥270 MPa |
| EN 10346 | DX51D+AZ | ReH≥140 MPa, A80≥18% |
| JIS G3321 | SGLD-AZ (cold rolled) | ReH≥140 MPa, Rm≥270 MPa |
GL Aluminum-zinc Alloy Coated Steel FAQ
The composition of GI and GL coatings is different, so there are differences in mechanical properties, chemical properties, application scenarios and costs.
Solution: Spray zinc-rich paint (zinc content ≥92%) or epoxy primer to seal the cutting surface.
Improper surface treatment of the substrate, defective plating process, external mechanical damage, and environmental erosion can cause the coating to peel off or flake off the surface of the aluminum-zinc-plated steel plate. By selecting the right thickness of zinc plating according to the application environment and strictly following the production standards for zinc plating and processing, we can prevent the coating from peeling off prematurely.
More Products
Aluminum-zinc alloy coated steel has excellent corrosion resistance, oxidation resistance, high temperature resistance, as raw materials can be processed into roofing panels, wall panels, piping systems, steel structures used in construction, industry, energy and other industries, but also through the surface of the roller coating organic paint to make more beautiful and corrosion-resistant PPGL pre-painted galvalume steel. Contact us for more information about our coated steel products!