Hot Dip Galvanized Steel | GI Steel | Galvanized Steel Sheet

At Shandong Pinjie, we've spent over 12 years perfecting our color-coated aluminized zinc (PPGL) steel coils. What started as a small production line has grown into two fully automated continuous coating facilities, producing 120,000 tons of high-quality steel annually for customers across 30+ countries. We don't just sell steel-we engineer solutions that stand up to the harshest environments and last for decades.

Our PE and PVDF coated products use a premium 55% aluminum, 43.5% zinc, and 1.5% silicon alloy base. This unique composition delivers corrosion resistance 2-6 times stronger than standard galvanized steel, making it a preferred choice for builders and manufacturers worldwide. Unlike low-cost alternatives that often peel, fade, or rust within 5 years, our 3-layer protective system (aluminized zinc base + chemical conversion layer + durable organic topcoat) eliminates the need for on-site painting, cuts construction time by 30%, and maintains consistent aesthetic and functional performance for years.

We understand every project is different. That's why we offer full customization: thickness from 0.2mm to 3.0mm, width from 600mm to 1500mm, and over 200 standard RAL colors. For architectural projects needing that extra touch, we also create custom marble, wood grain, brick, and even

We've worked on thousands of projects, from residential roofs to industrial facilities and high-rise buildings. Here's what our customers keep coming back for:

Industry-leading corrosion resistance, verified by testing Our aluminized zinc base provides 35+ years of basic corrosion resistance under normal atmospheric conditions. For coastal or industrial areas, our PVDF coating-with 70%+ pure fluorocarbon resin-delivers 20+ years of color retention and weather resistance. This performance has been validated through 3000 hours of neutral salt spray testing per ASTM B117 standards.

Engineered for reliable forming performance We know how costly production delays from material failure can be. Our products are engineered for exceptional formability-they can handle 180° bending without coating cracking or peeling under standard processing conditions. Whether you're roll forming, stamping, cutting, or welding, you can expect consistent performance across the entire coil.

Customization with fast turnaround times Tired of waiting weeks for custom colors or sizes? We keep most standard RAL colors in stock, and custom color matching takes just 7 days. We also offer precision slitting and cut-to-length services, so you get exactly what you need and minimize material waste. Small batch trial orders? No problem-we're flexible enough to handle both 5-ton samples and 500-ton bulk orders.

Long-term value through reduced maintenance While our upfront costs may be slightly higher than some competitors, our products save you money over the lifecycle. They reduce maintenance costs by 70% compared to traditional painted steel, and our warranties give you peace of mind for years to come. For budget-sensitive projects, our PE coating offers balanced performance at a competitive price (10-15 year service life). For high-end buildings and harsh environments, our PVDF coating is an industry-recognized premium solution.

Mechanical Properties (DX51D)

Yield Strength: 140 - 300 MPa

Tensile Strength: 270 - 350 MPa

Elongation: ≥ 22%

Construction

Hot dip galvanized steel uses in steel structure workshops, warehouses, airports, stations and other large public buildings. It produces purlins, beams, columns and enclosure systems. Zinc coating effectively resists atmospheric corrosion and reduces maintenance cost.

Solar Photovoltaic

Solar PV mounting structures extensively use hot dip galvanized steel. Product provides over 25 years corrosion protection in outdoor environment. Heavy zinc coating suits desert and coastal high corrosion areas.

Agricultural Greenhouse

Modern greenhouse frames adopt hot dip galvanized steel pipes. Product resists corrosion from high humidity and high ammonia environment. It widely applies in major vegetable production regions.

Automotive

Automobile body structure parts and chassis components use hot dip galvanized steel. Product improves vehicle anti-corrosion period and extends service life. Material meets strict forming and welding requirements of automotive industry.

Production Process

Hot dip galvanizing adopts continuous production line process. Cold rolled steel coil goes through uncoiling, welding, cleaning, then enters annealing furnace. Hydrogen in furnace reduces and removes surface oxide layer.

When steel plate temperature drops to 460-470°C, it immerses into molten zinc pot. Zinc liquid temperature maintains at 455-465°C. Steel plate stays 3-5 seconds in zinc liquid.

After exiting zinc pot, air knife controls coating thickness. Cooling section makes zinc layer crystallize and form spangle. Finally process includes temper rolling, leveling, oiling and coiling.

Whole production line operates under full computer control. Process parameters monitor in real time to ensure stable product quality.

After 12 years of exporting steel worldwide, we've learned a thing or two about getting products to their destination safely. Here's what you can expect:

Coil Packaging: Choose between vertical or horizontal packaging. All coils are wrapped in moisture-proof paper, secured with high-strength steel strapping, and protected with wooden or steel rings to prevent damage to the coil core.

Sheet Packaging: Standard sheets are stacked on fumigated wooden pallets with interleaving paper between layers to prevent scratches. The entire pallet is then wrapped in waterproof PE film.

Shipping: We ship from Qingdao, Tianjin,  ports, with weekly sailings to all major global destinations. We have long-term partnerships with Maersk, COSCO, and MSC, which means we can secure stable rates and guaranteed space even during peak seasons.

Trade Terms: We offer EXW, FOB, CIF, CFR, and DDP terms to suit your needs.

Delivery: Stock sizes ship in 7-10 days. Custom orders typically take 15-25 days, depending on the specifications. We'll keep you updated on production progress every step of the way.

Q: What's the difference between PPGL and PPGI? A: PPGL uses a 55% aluminum-zinc-silicon alloy base, while PPGI uses a pure zinc base. This makes PPGL 2-6 times more corrosion-resistant and gives it better heat reflectivity-perfect for roofing applications. PPGI is more affordable and works well for indoor applications or mild environments.

Q: Can you match a custom color for my project? A: Absolutely. Just send us a RAL color code or a physical sample, and our color matching team will create the exact shade you need in 7 days. We can also produce custom patterns like wood grain, marble, and brick for architectural projects.

Q: How do you ensure color consistency across multiple batches? A: We use computerized color matching systems and maintain strict control over our paint formulation and curing conditions. Every production run is compared to a master color sample using a spectrophotometer, ensuring a color difference (ΔE) of less than 2.0-indistinguishable to the human eye.

Q: Will your steel hold up in coastal areas with high salt spray? A: Yes. For coastal applications, we recommend our AZ150 coating weight with PVDF topcoat. Our PVDF products have passed 3000 hours of salt spray testing and will provide reliable performance for 20+ years in marine environments.

Q: Can I get samples before placing an order? A: Of course. We offer free A4 size samples for color and performance testing. If you need larger samples or custom-cut pieces, just let our sales team know, and we'll arrange it for you.