55% aluminum content aluminum-zinc coated coil

55% Al-Zn coated steel coils (also known as 55% Al-Zn steel coils, Galvalume, or GL coils) are coated steel coils featuring an aluminum-zinc-silicon alloy coating applied to the steel sheet surface via a hot-dip coating process.Standard composition (typical proportions): Aluminum (Al): approx. 55%; Zinc (Zn): approx. 43.4%; Silicon (Si): approx. 1.6%

55% Al-Zn coating produced via the hot-dip Galvalume process:
The steel strip enters a bath of molten metal at high temperature, forming an aluminum-zinc-silicon alloy coating on the surface that creates a dense protective layer upon cooling.

Key Features

• Superior Corrosion Resistance
  More corrosion-resistant than standard galvanized (GI) steel
  Particularly suitable for humid, industrial, and coastal environments
• Excellent High-Temperature Resistance
  High aluminum content → strong oxidation resistance
• Long Service Life
  Lasts approximately 2–6 times longer than galvanized steel under similar conditions
• Attractive Appearance
  Silvery-white finish with a "spangle" pattern or a spangle-free effect
  Suitable for color coating (producing color-coated Al-Zn coils)

Differences from Galvanized Coils (GI) (Key Points)

Why Choose JXL STEEL

• Superior Materials – We use premium galvanized steel sheets with a durable coating to ensure a long service life.
• Customization Options – We offer a variety of colors, thicknesses, and coating types to meet your project needs.
• Strict Quality Control – Each roll of steel undergoes comprehensive testing (coating, adhesion, corrosion, mechanical properties).
• Competitive Pricing – Excellent value for money without compromising quality.
• On-Time Delivery – An efficient production and logistics system ensures timely delivery.
• Technical Support – We provide professional guidance on product selection, installation, and maintenance.

                                    (JXL Steel production line)

Quality Inspection

• We first conduct a visual inspection to ensure the galvanized color steel coils are free of defects, facilitating subsequent processing and aesthetic use.
• Coating Performance Testing: We use a magnetic thickness gauge or coating thickness gauge to test the paint film thickness, ensuring it meets the customer's required thickness. JXL STEEL can produce paint films with a thickness of 25 microns on both the front and back sides. After testing, we sequentially conduct adhesion, bending performance, hardness, and impact resistance tests to ensure the paint does not crack or peel during customer use, and the product is fully qualified.
• Corrosion Resistance Testing: We will conduct salt spray tests to ensure that the color remains vibrant even in harsh operating environments.
• Substrate Mechanical Property Testing

  Project	Method	Common requirements
  Yield strength	tensile test	190~350 MPa
  Tensive strength	tensile test	270~450 MPa
  Elongation	tensile test	≥20%
  Bending performance	bending test	Bending diameter as specified by thickness
  Stamping performance	stamping test	No cracks

  （The data table above is taken from the test data of the DX51D grade. If you have any special requirements, please contact us.）

  

  

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  We have set up a sun exposure testing ground outside our factory, where some samples have been stored for over 10 years, yet they still look brand new and have vibrant colors.
• A third party is conducting an independent inspection of our products.

Export Cases

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• We receive a large number of foreign visitors every day, and they all give high praise and recognition to the color steel coils produced by our company.

Shipping site

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• Whether you choose container shipping or bulk cargo shipping, JXL STEEL guarantees that the products delivered to your factory will be intact and undamaged.