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Help CenterPrepainted Galvanized Steel Coil 0.3-3.0mm SGCC SPHC Z80-Z275 Medium Hardness Color Coated Coil
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Premium Prepainted Galvanized Steel Coil from Hemaokang Steel (Shandong) Co., Ltd. is a versatile and dependable solution for industries demanding both durability and visual appeal. As a professional manufacturer located in Liaocheng, Shandong, we specialize in producing color coated steel coils with thickness from 0.3 to 3.0 mm, substrates including SGCC and SPHC, zinc coating weights ranging from Z80 to Z275, and medium hardness for superior processing performance. Our coils are widely used in roofing, wall systems, home appliances, and industrial components, serving customers across the globe.
The product is manufactured through a continuous process that combines high-quality galvanized steel with modern coating technology. Each coil is designed to offer excellent corrosion resistance, uniform color, and strong adhesion to withstand harsh weather conditions and long-term exposure. With medium hardness, our coil provides an ideal balance between strength and flexibility, ensuring smooth roll forming and accurate bending without cracking.
Superior Coating Technology
Our prepainted galvanized steel coil features a sophisticated paint system consisting of a primer and a topcoat. The topcoat can be specified as polyester, silicon-modified polyester, PVDF, or high-durability polyester, depending on your application. This coating system not only protects the underlying zinc layer but also maintains its color and gloss for many years. The chemical pre-treatment of the substrate promotes strong paint adhesion, preventing flaking and peeling during fabrication or service.
Key Product Characteristics
- Corrosion Resistance: The combined protection of zinc and paint layers provides outstanding defense against moisture, pollutants, and salt spray.
- Excellent Formability: Medium hardness temper avoids work-hardening issues and allows deep drawing, roll forming, and pressing.
- Color Flexibility: Available in a wide range of RAL colors and custom finishes to match architectural and product design requirements.
- Consistent Quality: Our line monitors film thickness, gloss, and color consistency to ensure every coil meets strict specifications.
- Lightweight and Strong: High strength-to-weight ratio simplifies handling and reduces structural load.
- Cost Efficiency: Pre-painted coils eliminate secondary painting, cutting labor and material costs.
Technical Specifications
| Parameter | Specification |
|---|---|
| Base Metal | SGCC / SPHC |
| Thickness | 0.3 – 3.0 mm |
| Zinc Coating | Z80 – Z275 g/m² |
| Hardness / Temper | Medium hard |
| Coil Width | Customizable (typically 600 – 1250 mm) |
| Inner Diameter | 508 mm or 610 mm (optional) |
| Topcoat Type | Polyester, SMP, HDP, PVDF (optional) |
| Color Options | Custom RAL colors |
| Surface Treatment | Anti-fingerprint, passivated, oiled |
Applications and Benefits
In the construction sector, prepainted galvanized steel coils are used for roof panels, wall cladding, ceiling profiles, and purlins. The material’s aesthetic appeal and long service life make it a favorite for both residential and commercial buildings. In appliance manufacturing, the coil serves as a base for refrigerator panels, air conditioner housings, and washing machine shells. It also finds use in furniture, garage doors, and agricultural storage systems. The medium hardness property ensures that components retain their shape after bending and punching, offering excellent dimensional stability.
Additionally, the reflective nature of the paint helps reduce heat absorption, contributing to energy-efficient building envelopes. With a wide range of colors and textures, architects and engineers can achieve desired visual effects without sacrificing performance.
Production Process
Our manufacturing facility adopts a state-of-the-art continuous coating line that ensures uniformity and efficiency. The galvanized steel sheet is first cleaned and chemically treated to enhance paint bonding. Next, a primer coat is applied using precise rollers, followed by a curing process that hardens the film. The finish coat is then applied and cured again, after which the coil undergoes cooling, inspection, and recoiling. Throughout this process, advanced sensors and automated controls maintain exact thickness, temperature, and speed parameters. This meticulous approach results in coils with stable mechanical properties and an impeccable surface finish.
Quality Assurance
We operate under a comprehensive quality management system certified to ISO9001. Every batch of prepainted galvanized steel coil is tested by our in-house laboratory to verify adhesion, hardness, impact resistance, and salt spray performance. We also conduct T-bend tests and pencil hardness tests to ensure the coating can handle demanding fabrication processes. Incoming raw materials, such as hot-dip galvanized steel strips and paints, are sourced from qualified suppliers and checked upon delivery. Traceability is guaranteed through batch numbers recorded on each coil, allowing full accountability from production to final shipment.
Economical and Sustainable
Choosing our prepainted steel coil reduces your overall processing time and environmental impact. Because the painting is done at the mill, you avoid solvent emissions and waste associated with on-site painting. The finished product is highly recyclable and supports sustainable design initiatives. Moreover, the high material utilization rate minimizes scrap, helping you optimize costs. For contractors and manufacturers, this translates to a faster return on investment and a smaller carbon footprint.
Customization Options
We understand that every project has unique requirements. Therefore, we offer a wide spectrum of customization possibilities. Customers can choose between SGCC and SPHC substrate materials, specify thickness tolerances, and request particular zinc coating weights. In terms of color, we provide a vast palette of RAL codes and can match custom samples. Surface finishes such as anti-fingerprint or embossed patterns are also available upon request. Our technical team works closely with you to determine the most suitable specification for your environmental conditions and fabrication processes.
Packaging and Logistics
To prevent damage during ocean transport, our coils are packed with protective waterproof paper, plastic film, and steel strapping, with edge protectors on each side. Coils are loaded into containers in a stable manner to avoid shifting. Thanks to our location in Liaocheng, we enjoy close proximity to Qingdao Port, a major international port. This allows us to arrange efficient export shipment to North and South America, Europe, Asia, Africa, and Oceania. Our export team has extensive experience in international trade documentation and cargo handling, ensuring smooth delivery to your designated port.
Frequently Asked Questions
Q1: What are the key differences between SGCC and SPHC substrates?
SGCC is a hot-dip galvanized steel with a full zinc coating, providing superior corrosion resistance. SPHC is a hot-rolled steel that offers good formability and weldability. When choosing between them, consider the exposure level and fabrication method. SGCC is ideal for external applications, while SPHC can be an economical option for interior components.
Q2: What is the minimum order quantity (MOQ)?
Our standard MOQ is one full container, which allows us to offer competitive pricing. For trial orders, we may accept a smaller quantity to evaluate product quality and service. Please contact our sales team with your requirements and destination, and we will provide a tailored quotation.
Q3: Can I get custom colors and widths?
Yes, we support custom RAL colors and various coil widths. You can also specify desired thickness, zinc coating, and inner diameter. Our production line can be adjusted to manufacture your custom specification with reasonable lead time.
Q4: How does zinc coating weight (Z80-Z275) affect performance?
A higher zinc coating weight provides a thicker protective layer, which significantly improves corrosion resistance in marine or industrial atmospheres. Z80 is suitable for mild indoor conditions, while Z180 to Z275 is recommended for coastal areas or environments with high humidity and salt exposure.
Q5: What does 'medium hardness' mean for my fabrication?
Medium hardness represents a balanced tempering condition. The steel is neither too soft nor too hard, giving it excellent spring-back control and edge durability. This makes it suitable for roll forming, cutting, and simple bending while maintaining necessary stiffness in the final product.
Q6: How do you maintain color consistency between production batches?
We use a spectrophotometer to compare each batch against the approved standard sample. The paint supplier is held to strict batch-to-batch viscosity and pigment control. We also keep reference panels and digital records so repeat orders can be matched precisely.
Q7: What is the typical lead time for export orders?
For standard thickness and common colors, production usually takes 15-20 days after deposit confirmation. Custom colors or special coatings may require 25-30 days. Shipping time depends on the destination port. We will always provide a clear delivery schedule before order confirmation.
Q8: Can you provide technical support or accept third-party inspection?
Certainly. We welcome inspection by third-party inspection agencies. Our engineers are available to discuss product selection, processing parameters, and installation methods. We are committed to ensuring your complete satisfaction through reliable products and responsive after-sales service.
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