Product Description

Galvanized Steel Strip Coils are carbon steel strips coated with a protective layer of zinc through a hot-dipping process, providing excellent corrosion resistance and extended service life. Manufactured by Wuxi Sylaith Special Steel Co., Ltd in Jiangsu, China, these coils combine the strength of Q195/Q235/Q235B base materials with advanced cold rolling technology and uniform zinc coating (Z81-Z120), making them the preferred choice for construction and industrial applications.

Our Prime Galvanized Steel Coils are produced from high-quality cold-rolled steel strips, ensuring consistent mechanical properties, precise dimensional accuracy, and superior surface finish. Whether you need material for pipe manufacturing, roofing sheets, or general fabrication, this product delivers reliability and versatility.

Why Choose Sylaith Galvanized Steel Coils?

• Superior Corrosion Resistance: Z81-Z120 zinc coating protects against rust and harsh environments

• Excellent Formability: Cold rolled technology enables easy bending, punching, and cutting

• Consistent Quality: Manufactured under strict quality control with multiple international certifications

• Hard Hardness Grade: Suitable for applications requiring higher strength and durability

• Flexible MOQ: Starting from 1 tons, sample orders accepted

Applications

The versatility of Sylaith Galvanized Steel Coils makes them suitable for numerous industries and applications:

1. Pipe Manufacturing

Ideal base material for manufacturing welded pipes, conduits, and tubing used in construction, water supply, and infrastructure projects.

2. Roofing & Construction

Perfect for corrugated roofing sheets, wall panels, purlins, and building cladding systems.

3. Container Manufacturing

Used for shipping containers, storage tanks, and industrial containers requiring corrosion protection.

4. Fencing & Guardrails

Ideal for highway guardrails, security fencing, garden fences, and agricultural enclosures.

5. General Fabrication

Suitable for making small tools, machine parts, electrical cabinets, and stamped components.

6. Cutting Sheets

Can be slit and cut into sheets for various industrial and manufacturing applications.

7. Automotive Components

Used for underbody parts, brackets, and structural components requiring strength and rust resistance.

Working Principle: How Galvanized Steel Coils Are Made

Cold Rolled Galvanized Steel Coils are produced through a precise manufacturing process:

Step 1: Cold Rolling Base Material Preparation

High-quality Q195/Q235/Q235B hot rolled steel strips undergo cold rolling to achieve precise thickness (0.3-2.0mm), improved surface finish, and enhanced mechanical properties. Cold rolling also increases strength and hardness (Hard grade).

Step 2: Surface Cleaning

The cold rolled strip is thoroughly cleaned through:

• Degreasing: Removes rolling oils and contaminants

• Pickling: Removes iron oxides and scale

• Fluxing: Prepares the surface for optimal zinc adhesion

Step 3: Hot Dip Galvanizing

The cleaned strip passes through a bath of molten zinc at approximately 450°C-460°C. A metallurgical bond forms between the steel and zinc, creating a corrosion-resistant layer. The coating weight is precisely controlled to Z81-Z120 (grams per square meter).

Step 4: Cooling & Finishing

After coating, the strip is cooled, then may undergo skin pass or tension leveling to improve flatness and surface quality.

Step 5: Inspection

Every coil is inspected for:

• Coating thickness and uniformity

• Surface quality and appearance

• Mechanical properties

• Dimensional accuracy (thickness, width)

Step 6: Coiling & Packaging

The finished product is recoiled, weighed, and packaged with waterproof paper and steel strips for safe ocean transport.

FAQ (Frequently Asked Questions)

Q1: What is the difference between Q195, Q235, and Q235B?

A:

• Q195 has lower carbon content (≤0.12%), making it softer and more formable—ideal for complex bending and light applications.

• Q235 has medium carbon content (≤0.22%) for higher strength—suitable for general structural use.

• Q235B is a variant of Q235 with guaranteed impact toughness at 20°C, making it suitable for colder environments and load-bearing applications.

All three are low-carbon steels with excellent weldability and formability.

Q2: What does "Z81-Z120" zinc coating mean?

A: "Z" stands for Zinc, and the number indicates the coating weight in grams per square meter (total both sides). Z81-Z120 means the coil has a zinc coating of 81-120 g/m². Higher coating weights offer better corrosion resistance. For comparison:

• Z60-Z80: Standard interior applications

• Z81-Z120: Exterior and moderate corrosion environments

• Z180-Z275: Heavy-duty, marine, and high-corrosion environments

Q3: What is the advantage of "cold rolled technology"?

A: Cold rolling offers several benefits over hot rolled:

• Tighter thickness tolerances (±1%)

• Smoother surface finish for better coating adhesion

• Improved mechanical properties (higher strength, better hardness)

• More uniform thickness across the strip

• Better flatness for precision applications

Q4: What does "Hard" hardness mean?

A: "Hard" hardness indicates the coil has been cold rolled to achieve higher strength and resistance to deformation. This is suitable for applications requiring:

• Higher load-bearing capacity

• Wear resistance

• Structural rigidity

• Reduced spring-back during forming

Q5: What is your delivery time?

A: We offer fast delivery within 7 days after order confirmation for standard specifications. Custom orders may require additional time depending on quantity and processing requirements.

Q6: Can you provide samples before bulk order?

A: Yes, samples are available upon request. We welcome trial orders to test our quality before committing to larger volumes. MOQ for trial orders can be flexible.

Q7: What payment terms do you accept?

A: We accept T/T (30% deposit + 70% balance before shipment) . Other terms can be negotiated for long-term partnerships.

Q8: Is this product suitable for outdoor applications?

A: Yes. With Z81-Z120 zinc coating, these coils provide excellent corrosion protection for outdoor applications like roofing, fencing, and construction. For harsh coastal or industrial environments, higher coating weights (Z180+) are recommended.

Q9: Can you customize the width and length?

A: Absolutely! We offer customized width (700-2000mm) and length based on your requirements. For PPGI products, we also offer custom RAL colors matching your samples.

Q10: What is the difference between GI and PPGI?

A:

• GI (Galvanized Steel): Zinc-coated only, silver-gray appearance

• PPGI (Pre-Painted Galvanized Steel): GI coil with an additional color coating layer, available in various RAL colors

We supply both options based on your needs.

Q11: How do you ensure product quality?

A: We implement strict quality control throughout production:

• Raw material inspection

• In-process monitoring (thickness, coating weight)

• Final inspection before packaging

• Full traceability with Mill Test Certificate (MTC)

Q12: What is your packaging for export?

A: We use standard seaworthy packaging or as customers required.

Q13: Do you offer processing services?

A: Yes, we provide various processing services:

• Welding

• Punching

• Cutting (slitting, cut-to-length)

• Bending

• Decoiling