Explore our high-performance structural steel and coil products, manufactured to rigorous international standards.
Founded in 1998, Tianjin Minjie Steel Co., Ltd. has established itself as an authoritative leader in modern steel manufacturing. Our massive manufacturing facility, spanning over 70,000 square meters, is strategically situated just 40 kilometers from Xingang Port (Tianjin)—the largest and most active maritime hub in Northern China. This prime geographic location ensures highly efficient, cost-optimized, and resilient global logistics for all export operations.
As a professional manufacturer and exporter of diversified steel products, our lines comprise 4 high-speed pre-galvanized lines, 8 ERW precision welded steel pipe lines, and 3 advanced hot-dipped galvanized processing lines. We maintain strict compliance with global specifications including ASTM, GB, DIN, and JIS. Additionally, all processes run under the rigorous ISO9001 quality management standard, securing our reputation for absolute reliability.
Galvalume Steel Coil, known as Aluzinc or Zincalume in various regional markets, is coated with a high-performance alloy of 55% Aluminum, 43.4% Zinc, and 1.6% Silicon. The designation "AZ150" specifically represents a total double-side coating mass of 150 grams per square meter (minimum triple-spot average). This level of alloy coating provides a unique combination of sacrificial galvanic protection and durable barrier protection.
| Technical Parameter | Specification Details (AZ150 Standard) | Applicable Standards |
|---|---|---|
| Alloy Composition | 55% Al, 43.4% Zn, 1.6% Si | ASTM A792 / EN 10346 |
| Coating Weight (AZ150) | Min. 150 g/m² (Double-sided total) | JIS G3321 / GB/T 14978 |
| Salt Spray Performance | No red rust up to 1000+ Hours | ASTM B117 / ISO 9227 |
| Thermal Reflectivity | > 70% of solar radiation | Energy Star Rated (Cool Roof applications) |
| Available Thickness Range | 0.15 mm to 2.5 mm | Customizable per structural requirements |
In modern industrial design, sourcing managers are shifting away from lighter coatings (such as AZ70 or AZ100) toward AZ150 and higher classifications. This transition is motivated by a focus on reducing the total cost of ownership (TCO) and achieving building sustainability targets.
AZ150 offers double the service life of standard Z275 galvanized options in marine, industrial, or acidic micro-climates without requiring post-installation coatings.
With the global build-out of commercial photovoltaic plants, engineering specifications mandate high coating weights like AZ150 for structural stability over a 25-year operational span.
Its high heat reflectivity makes AZ150 suitable for agricultural roofing, helping to reduce cooling energy usage in poultry and livestock sheds.
By standardizing on AZ150, global buyers avoid premature structural failure and minimize maintenance shutdowns, allowing them to meet environmental standards like LEED and BREEAM for green construction projects.
The Chinese steel processing landscape has transitioned from simple scale-based output to highly advanced, quality-focused manufacturing. Leading factories, including Tianjin Minjie Steel, incorporate advanced automation and data analysis to meet the demands of global buyers.
Additionally, our proximity of 40 kilometers to Tianjin’s Xingang Port reduces inland transport times, lowers emissions, and limits the risk of transit damage before the material is loaded onto container or break-bulk shipping lines.
We maintain certified production practices verified by leading third-party audit firms.
Over our history, Tianjin Minjie Steel has worked with engineering and procurement firms in diverse climates to address specific mechanical and corrosion challenges.
In Singapore's high-humidity marine environment, we supplied AZ150 prepainted coils for commercial roofing, providing durability under persistent UV and moisture exposure.
Our engineering team worked with Korean structural design clients to deliver specialized profiles for heavy machinery assembly, utilizing high-flatness AZ150 substrates.
We supplied AZ150 products designed to withstand high salt levels in coastal Australia, extending building lifespans compared to standard galvanized steel.
A manufacturer of pre-engineered structures sourced AZ150 coils for manufacturing roof panels and wall panels, providing corrosion resistance for industrial sites.
Following a direct visit in 2017, a Lebanese client ordered structural tubing and coils to support reconstruction projects in high-salt coastal zones.
For structures exposed to high desert temperatures and dust, AZ150 coils were supplied to limit corrosion and reflect solar heat, helping reduce interior cooling demands.
Tianjin Minjie Steel participates in the Canton Fair annually, utilizing this international forum to showcase updates to our production lines and coating technologies. These exhibitions allow us to connect directly with global buyers, understand localized requirements, and establish long-term supply arrangements.
More than 80% of our buyers conduct visits to our Tianjin factory after initial consultations at international exhibitions, allowing them to verify our production capability and check our ISO-certified quality management processes firsthand.
Complementary construction structural products manufactured to meet diverse mechanical engineering demands.
Minjie Steel
