Color coated galvanized steel coil for buildings combines a hot-dip galvanized substrate with a factory-applied organic coating system (PE, SMP, HDP or PVDF). It is supplied in thicknesses of 0.3–1.5 mm, widths of 600–1250 mm and coil weights of 1–15 tons, and is designed for roofing, wall cladding, facades, enclosure systems and other architectural applications. Color difference is controlled to ΔE ≤2.0, coating adhesion reaches 0 grade, and coating thickness deviation is kept within ±2 μm. Products can be supplied to GB, ASTM, EN and JIS standards with MTC EN 10204 3.1 and third-party SGS inspection reports.
Tianjin Shunchen Industrial manufactures Color Coated Galvanized Steel Coil For Buildings using hot-dip galvanized steel as the primary substrate and offers PE, SMP, HDP and PVDF coating systems for different building environments and performance requirements. The coils are designed for roofing panels, wall cladding, building facades, enclosure systems and other architectural applications where corrosion protection, coating adhesion, color consistency and formability are important.
With more than 12 years of experience in steel production and export, Shunchen operates multiple automated color coating production lines and a national-level material testing laboratory. Each production batch is subject to process and quality inspection covering dimensions, coating thickness, color difference, adhesion and other key performance indicators. Products can be supplied according to GB, ASTM, EN and JIS standards, with MTC EN 10204 3.1 and third-party SGS inspection reports available according to project requirements.
What Is Color Coated Galvanized Steel Coil?
Color coated galvanized steel coil is a prepainted steel material consisting of a galvanized steel substrate, surface pretreatment, primer and top coating. The galvanized layer provides the basic corrosion protection of the steel substrate, while the coating system adds protection against environmental exposure and provides the required color and surface appearance.
The typical structure is:
Steel Substrate → Zinc Coating → Surface Pretreatment → Primer → Top Coat
This multilayer structure allows the material to combine the properties with the functional and decorative characteristics of a factory-applied organic coating. For building applications, the material can subsequently be processed into roofing sheets, wall panels, cladding panels, sandwich panel facings and other formed components.
Product Structure and Coating Systems
Shunchen provides different coating systems according to the required balance between weather resistance, appearance, processing performance and project requirements.
Hot-Dip Galvanized Steel Substrate
Hot-dip galvanized steel provides the base material for many building applications. The zinc coating helps protect the underlying steel from atmospheric corrosion and provides a suitable surface for subsequent coating processes.
PE Polyester Coating
PE polyester is a commonly used coating system for general architectural and building applications. It provides a balance of appearance, adhesion, flexibility and processing performance, and can be used for building components where standard weather resistance and forming performance are required.
SMP Silicon Modified Polyester Coating
SMP combines polyester coating properties with modified silicone resin to improve weather resistance and coating durability. It is suitable for building roofs, wall systems and other applications exposed to outdoor environmental conditions.
HDP High-Durability Polyester Coating
HDP is designed for applications requiring improved durability and weather resistance compared with conventional polyester systems. It can be used for architectural exterior surfaces where color stability and surface appearance are important.
PVDF Fluorocarbon Coating
PVDF is available for applications requiring a higher level of weather and color retention performance. According to Shunchen's accelerated weathering and salt spray test results, PVDF-coated samples showed strong resistance to color change, coating damage and corrosion under the specified test conditions.
Key Features of Color Coated Galvanized Steel Coil
- Galvanized Base for Corrosion Protection: The galvanized substrate provides a zinc-based protective layer beneath the paint system, adding protection for steel used in building envelopes and outdoor applications.
- Multiple Coating Options: PE, SMP, HDP and PVDF coating systems are available for different requirements, from general building applications to projects with higher weather-resistance requirements.
- Controlled Coating Thickness: Standard coating configuration includes a top coat of approximately 18–25 μm and a back coat of approximately 5–10 μm, with customization available.
- Controlled Color Difference: A color difference spectrophotometer is used for color calibration, with a production control target of ΔE ≤2.0 to maintain consistency between production batches.
- Strong Coating Adhesion: The coating adhesion test reaches 0 grade under the stated testing method, indicating no coating peeling after grid cutting.
- Forming and Secondary Processing: The coated steel can be processed through bending, stamping, slitting and other secondary operations when the selected substrate and coating system are appropriate.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product | Color Coated Galvanized Steel Coil |
| Main Substrate | Hot-Dip Galvanized Steel |
| Optional Base Plate | Galvalume Steel, Cold Rolled Steel |
| Coating Systems | PE, SMP, HDP, PVDF |
| Thickness | 0.3–1.5 mm |
| Width | 600–1250 mm |
| Coil Weight | 1–15 tons |
| Top Coating Thickness | 18–25 μm |
| Back Coating Thickness | 5–10 μm |
| Thickness Tolerance | ±0.02 mm |
| Width Tolerance | ±1 mm |
| Color | RAL colors and customized colors |
| Surface Finish | High gloss, matte, embossed, printed |
| Slitting | Available according to requirements |
| Applicable Standards | GB, ASTM, EN, JIS |
| Inspection Documents | MTC EN 10204 3.1, SGS inspection report according to requirements |
Base Material Options
The galvanized base plate is the main substrate for this building-oriented product. Shunchen also provides Galvalume and cold rolled steel substrates for applications requiring different material characteristics.
Base Plate Chemical Composition
| Material | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
|---|---|---|---|---|---|
| Hot-Dip Galvanized Base | ≤0.12 | ≤0.03 | 0.20–0.50 | ≤0.035 | ≤0.035 |
| Galvalume Base | ≤0.10 | 0.20–0.40 | 0.25–0.55 | ≤0.030 | ≤0.030 |
Base Plate Mechanical Properties
| Material | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|
| Galvanized Steel Base | 300–420 MPa | 220–320 MPa | ≥28% |
| Galvalume Steel Base | 310–430 MPa | 230–330 MPa | ≥27% |
Actual material selection should be matched to the required forming process, structural design and applicable project standard.
Applicable Standards
Shunchen's Color Coated Galvanized Steel Coil for Buildings can be supplied according to different regional and industry standards.
| Standard System | Standard | Main Application Regions |
|---|---|---|
| Chinese Standards | GB/T 12755-2021, GB/T 13448-2019 | China, Southeast Asia |
| American Standards | ASTM A755, ASTM A924 | North America, Middle East |
| European Standards | EN 10346, EN 10169 | Europe, Africa |
| Japanese Standards | JIS G3312, JIS G3322 | Asia |
The applicable standard should be confirmed according to the final building application, project specification and destination market.
Applications in Building Construction
Color coated galvanized steel coil can be further processed into a variety of building materials and components.
- Roofing Panels for factories, warehouses, logistics facilities and commercial buildings
- Exterior Wall Cladding for industrial and commercial buildings
- Industrial Factory Buildings in humid, hot or high-rainfall environments
- Warehouses and Logistics Facilities roofing and wall enclosure systems
- Commercial Building Facades and architectural metal panels
- Residential and Villa Roofing and exterior components
Roofing Panels
The coil can be roll-formed into profiled roofing sheets for factories, warehouses, logistics facilities, commercial buildings and other structures. The combination of galvanized substrate and color coating provides both corrosion protection and an architectural surface finish.
Exterior Wall Cladding
Color coated steel can be formed into wall panels and cladding systems for industrial and commercial buildings. HDP, SMP or PVDF systems can be selected when higher outdoor weather resistance is required.
Commercial Building Facades
For commercial complexes and architectural facades, color, gloss, surface texture and color consistency become important selection factors. High-gloss, matte, embossed and other surface finishes are available according to production requirements.
Color and Surface Options
Building projects often require the steel surface to coordinate with architectural design. Shunchen supports:
- RAL color selection
- Customized colors
- High-gloss surfaces
- Matte surfaces
- Embossed surfaces
- Printed surfaces
For projects requiring multiple production batches, color matching and ΔE control can help maintain visual consistency between different batches.
Weather and Corrosion Resistance Testing
Shunchen provides performance data from accelerated weathering, salt spray and coating mechanical property tests. The results below refer to the specified test methods and test conditions.
Accelerated Weathering Aging Test
Test standards: ASTM G154 and ISO 11507. Test condition: UV irradiation and humidity cycles for 3,000 hours.
Three types of coated samples were compared: ordinary low-grade painted coil, standard PE color coated coil, and high-end PVDF color coated coil. The test results showed severe fading, blistering and partial peeling on the ordinary painted coil. The PE sample showed slight color change without blistering or peeling, while the PVDF sample showed almost no visible color difference and maintained coating integrity under the specified test conditions.
Salt Spray Corrosion Test
Test standard: ASTM B117. Test condition: 5% neutral salt spray.
| Sample | Reported Result |
|---|---|
| Ordinary painted coil | Red rust appeared after 500 hours |
| SMP color coated coil | No rust after 2,000 hours |
| PVDF color coated coil | No rust or coating damage after 5,000 hours |
These figures are laboratory test results under specified conditions and should not be interpreted as direct service-life guarantees for every building environment.
Coating Mechanical Performance
The coating system is also evaluated for mechanical performance during secondary processing.
| Test Item | Reported Result |
|---|---|
| Coating Adhesion | 0 grade |
| Impact Resistance | 90 kg·cm without coating cracking |
| T-Bend | T=2 without coating cracking |
| Pencil Hardness | ≥2H |
These properties are relevant when the coil needs to undergo bending, stamping, profiling, slitting or other fabrication processes.
Real-World Building Application
Industrial Factory Roof and Wall Cladding
In a Southeast Asian industrial construction project, an SMP silicon modified polyester color coated coil with a Galvalume substrate and 0.5 mm thickness was selected for a factory roof and wall application. The original building materials had experienced fading and corrosion in a tropical environment characterized by high temperature, humidity and rainfall. The replacement material used a customized weather-resistant color and SMP coating system.
According to the supplied project record, after seven years of outdoor use, the material maintained uniform color without obvious fading, rust or coating peeling. The project record also reports that the expected service life was extended from two years to more than ten years and that maintenance costs were reduced by 72%. The reported annual procurement volume for the project reached approximately 1,200 tons.
Quality Control and Testing
Shunchen applies quality control throughout the color coating production process.
Production and Inspection Equipment
- Fully automated continuous color coating production lines
- Online coating thickness gauges
- Color difference spectrophotometers
- Salt spray testing equipment
- UV aging testing equipment
- Material testing laboratory
Key Quality Indicators
- Coating thickness
- Color difference
- Surface appearance
- Coating adhesion
- Dimensional tolerance
- Base material properties
- Finished coil condition
The stated coating thickness deviation target is ≤±2 μm, while the color difference control target is ΔE ≤2.0.
Manufacturing and Supply Capability
Tianjin Shunchen was established in 2014 and has developed from a steel trading company into an industrial group integrating steel processing, galvanizing, logistics and international trade. The company currently has more than 300 employees, annual production capacity exceeding 450,000 tons, three hot-dip galvanizing production lines, one steel structure production line, two anti-corrosion spraying lines, more than 40,000 m² of production and warehouse space, more than 2,000 long-term cooperative clients, and ISO 9001 quality management system certification. The company also operates production facilities in multiple locations, allowing products to be shipped from different regions according to project requirements.
Customization for Building Projects
Different building projects require different combinations of substrate, coating and surface specifications. Shunchen supports customization of steel thickness, coil width, coil weight, base material, coating system, coating thickness, RAL color, surface gloss, surface texture, embossed or printed finish, slitting requirements and export packaging. For construction projects, the technical team can review the intended application, environmental conditions, forming requirements and material specifications before recommending the appropriate configuration.
Packaging and Shipment
Color coated steel coils are prepared for transportation with protective packaging designed to reduce moisture and physical damage during handling and shipment. Standard export packaging includes waterproof film, kraft paper, steel strapping and edge and coil protection where required. Customized packaging and logo packaging are available according to customer requirements.
Shipping documents can include bill of lading, commercial invoice, Mill Test Certificate and third-party inspection report. The supplied loading reference is approximately 23 tons for a 20-foot container and 46 tons for a 40-foot container, subject to actual coil dimensions, container restrictions and shipping requirements.
How to Choose Color Coated Galvanized Steel Coil for Buildings
Choosing the appropriate color coated galvanized steel coil depends on the building's environment and processing requirements rather than coating type alone.
1. Consider the Building Environment
For normal indoor or general building applications, a standard PE system may be sufficient. Buildings exposed to strong sunlight, humidity, coastal conditions or demanding outdoor environments may require SMP, HDP or PVDF systems.
2. Select the Appropriate Substrate
Hot-dip galvanized steel is a common substrate for architectural applications. Galvalume or cold rolled steel can also be considered when the project specification calls for a different substrate.
3. Confirm Thickness and Width
The coil thickness and width should match the downstream roll-forming equipment, panel design and structural requirements.
4. Match the Coating to the Processing Method
If the material will undergo bending, stamping or profiling, coating flexibility and adhesion should be considered together with the mechanical properties of the base steel.
5. Confirm Color and Surface Requirements
Architectural projects may require a specific RAL color, gloss level, matte finish, embossed pattern or printed surface. Color difference control is particularly important when several batches are used on the same building.
6. Confirm Inspection and Documentation
For international construction projects, buyers can request the applicable standard, MTC, coating test data and third-party inspection documentation before shipment.
Why Choose Tianjin Shunchen?
Tianjin Shunchen combines steel processing experience, coating technology, laboratory testing and export experience to supply color coated galvanized steel coil for building applications. The company has developed from a steel trading business established in 2014 into a comprehensive industrial group with more than 300 employees and annual production capacity exceeding 450,000 tons.
Material Selection
Technical support for selecting substrate, coating system, thickness and surface finish according to the intended application.
Quality Control
Production inspection covering coating thickness, color difference, adhesion, dimensions and surface condition.
Testing Documentation
MTC EN 10204 3.1 and third-party SGS inspection reports can be provided according to project requirements.
Customization & Export
Support for RAL colors, coating systems, surface finishes, dimensions, slitting and packaging. 12+ years of export experience.
Frequently Asked Questions
What is the difference between color coated galvanized steel coil and galvanized steel coil?
Galvanized steel coil has a zinc coating on the steel substrate, while color coated galvanized steel coil adds a pretreatment and organic coating system over the galvanized substrate. The additional coating provides color and surface protection and allows the material to be used directly for many architectural applications after forming.
What coating systems are available for building applications?
Shunchen provides PE, SMP, HDP and PVDF coating systems. The appropriate system depends on the building environment, weather exposure, appearance requirements and expected processing conditions.
What thicknesses and widths are available?
The stated product thickness range is 0.3 mm to 1.5 mm, with width options from 600 mm to 1,250 mm. Coil weight typically ranges from 1 ton to 15 tons, and customized slitting is available.
Can the color be customized?
Yes. The Color Coated Galvanized Steel Coil for Buildings can be supplied in RAL colors and customized colors. High-gloss, matte, embossed and printed surface finishes are also available.
Can color coated galvanized steel coil be used for roofing?
Yes. It can be roll-formed into roofing panels for industrial factories, warehouses, logistics facilities, commercial buildings, residential buildings and other structures. The substrate, coating system and thickness should be selected according to the building environment and panel design.
Can the coil be bent or roll-formed?
Yes. The product is designed for downstream processing such as bending, roll forming, slitting and stamping when the selected material and coating system are suitable for the required process. Shunchen reports a T-bend result of T=2 without coating cracking under its stated test conditions.
What documents can be provided with the shipment?
Depending on the project requirements, Shunchen can provide mill test certificates such as MTC EN 10204 3.1 and third-party SGS inspection reports, together with standard shipping documents.
How should I choose between PE, SMP, HDP and PVDF?
The choice should be based on the intended building environment, exposure conditions, required weather resistance, appearance requirements and processing method. PE is commonly used for general applications, while SMP, HDP and PVDF can be considered when higher weather or durability requirements apply.
Can you provide samples before bulk production?
Yes. Shunchen's stated service includes free samples and test reports for customer evaluation, subject to the specific project and sample requirements.
Request Color Coated Galvanized Steel Coil for Your Building Project
If you are sourcing color coated galvanized steel coil for roofing, wall cladding, factory buildings, warehouses or commercial facades, provide your required thickness, width, substrate, coating system, color, surface finish, application environment and estimated quantity. Tianjin Shunchen can evaluate the requirements and provide a suitable material configuration, technical documentation and quotation for your project.
