Corrugated steel roofing sheets represent one of the most reliable and widely utilized materials in the modern industrial construction envelope market. Driven by structural efficiency, weather protection, and cost competitiveness, these profile sheets have transitioned from simple rural coverings into high-tech, engineered systems configured for commercial logistics centers, industrial factories, and smart agriculture facilities.
The characteristic wave profile offers excellent load-bearing capacity, reducing the structural support weight and lowering installation costs across wide-span building structures.
By using modern Galvanized (GI), Galvalume (GL), and prepainted color-coated (PPGI/PPGL) layers, corrugated profiles easily resist tough marine, industrial, and agricultural environments.
Steel is 100% recyclable. Modern factories use sustainable manufacturing systems to reduce energy consumption and align products with international green building certifications.
Established in 1998, Tianjin Minjie Steel Co., Ltd. has grown into a leading manufacturer and exporter of structural steel products. Our massive factory facility spans over 70,000 square meters, strategically positioned just 40 kilometers from Xingang Portโthe largest port in North China. This ideal location guarantees smooth logistics and reliable container shipping schedules for our international clients.
We manufacture a broad range of high-quality products, including pre-galvanized steel pipes, hot-dip galvanized pipes, welded steel pipes, square & rectangular hollow sections, structural scaffolding systems, and cold-formed profile steel sheets. Dedicated to engineering innovation, we hold three premium utility patents: Groove Pipe, Shoulder Pipe, and Victaulic Pipe systems.
All of our manufacturing lines operate under the strict governance of the ISO9001 Quality Certification System. We adhere closely to global standard protocols including GB (China), ASTM (USA), DIN (Germany), and JIS (Japan) to ensure that every shipment matches our customers' exact engineering requirements.
To assist procurement managers and structural engineers in finding the right solution, we maintain tight control over the following chemical and physical parameters of our corrugated roofing and structural steel systems:
| Parameter / Metric | Galvanized (GI) Profiles | Galvalume (GL) Profiles | Prepainted Color-Coated (PPGI/PPGL) |
|---|---|---|---|
| Base Metal Thickness | 0.12 mm โ 1.20 mm | 0.15 mm โ 0.80 mm | 0.13 mm โ 1.00 mm |
| Metallic Coating Mass | Z40 โ Z275 g/mยฒ | AZ30 โ AZ150 g/mยฒ | Z40 โ Z275 / AZ30 โ AZ150 g/mยฒ |
| Yield Strength (Mpa) | G300, G550 (Full Hard) | G300, G550 (Structural Grade) | CGCC, TDC51D, G550 equivalents |
| Standard Profiles | Wave/Round Profile, Trapezoidal (Box) | Trapezoidal, Tile-emulated, V-125 | Wave, Trapezoidal, Roman tile, Step profile |
| Paint Layer (Top/Back) | N/A | N/A | 15โ25 ฮผm / 5โ10 ฮผm (PE, PVDF, SMP) |
Our factory uses advanced cold-roll forming machines to profile steel sheets with tight dimensional tolerances. This ensures that every sheet matches the next, making installation fast and ensuring watertight seals at the overlapping joints. We also offer customization options for profile height, pitch, and width to suit unique wind load demands in different geographic locations.
By utilizing high-grade polyester (PE), Silicon Modified Polyester (SMP), and Polyvinylidene Fluoride (PVDF) coating systems over premium zinc and aluminum-zinc substrates, our prepainted roofing products resist chalking and color fading, providing reliable protection in coastal and hot desert climates.
Tianjin Minjie Steel operates advanced manufacturing systems to deliver consistent high quality. Our factory features modern production lines configured for structural materials:
4 modern production lines engineered for continuous inline zinc-coating of precision strip steel, ensuring uniform zinc layer thickness and excellent paint adhesion.
3 hot-dip batch process lines that provide thick zinc coverage, offering robust industrial protection for structural framing and heavy-duty pipes.
8 Electric Resistance Welded (ERW) lines producing precise hollow sections and tubes, offering excellent dimensional accuracy and weld integrity.
Over the years, we have built strong supply chains that serve customers on six continents. Our team works closely with project developers, international distributors, and contractors to deliver custom structural steel products on time.
In September 2019, our delegation traveled to Singapore to inspect construction sites and plan collaborative projects. Our clients praised our consistent material performance and responsive logistics.
In 2019, structural design experts from South Korea visited our factory to source customized cold-rolled profiles. We collaborated closely on design details, laying the foundation for ongoing structural projects.
In November 2018, long-term Australian partners audited our manufacturing facility. They confirmed that our physical yield testing and galvanizing coating thickness align with AS/NZS standards.
In 2019, Indian procurement officers visited our factory after evaluating several regional manufacturers. They signed a long-term supply agreement for 10 structural container cabinets per month.
In June 2017, a major Lebanese distributor visited our factory and placed an immediate order for 1,000 tons of structural steel pipes and profiles to support reconstruction projects in Beirut.
Following initial talks at the Canton Fair, a prominent Saudi business group visited our facility in 2018 to establish a robust supply line of structural materials for regional logistics warehouses.
We regularly attend the China Import and Export Fair (Canton Fair) every year. Over the years, these events have connected us with clients worldwide, with over 80% of our discussions leading to follow-up visits at our manufacturing facilities in Tianjin.
Through these direct connections, clients can inspect our raw material storage, check our roll-forming and welding precision, and verify our third-party metallurgical lab tests.
Modern building projects require more than just raw steel. Tianjin Minjie delivers comprehensive design-to-delivery solutions that address challenges in modern infrastructure and construction projects:
We supply complete roofing, purlin, and support column solutions. Our materials are engineered to match building spans, reducing on-site fabrication time and minimizing project delays.
Our galvanized and prepainted corrugated sheets are engineered to resist high humidity and corrosive environments, making them ideal for heavy-duty livestock shelters and grain storage silos.
Our corrugated panels feature precise profile geometry and high load-bearing capacity, providing a strong structural foundation for solar racking and photovoltaic system installations.
As environmental conditions become more challenging, standard galvanizing is giving way to advanced alloy technologies. Tianjin Minjie is upgrading its production capabilities with Zinc-Aluminum-Magnesium (ZAM) alloy-coated steel sheets.
ZAM coatings offer up to three times the corrosion resistance of standard galvanizing. They feature a self-healing effect on cut edges, making them a highly cost-effective and durable solution for industrial roofing applications.
To ensure complete reliability, every production batch at Tianjin Minjie undergoes testing for tensile strength, yield limits, coating mass, and dimensional accuracy.
Quality Management Standard Certification
Verified Material Standards Compliance
SGS and ISO Compliant Verification
Material Heat Traceability Approved
Export Quality and Standard Approval
Tested and Certified Yield Properties
Corrosion Resistance Lab Verified
Minjie Steel
