Explore our premium structural steel lineup manufactured at our ISO 9001-certified facility, designed to meet rigorous standards worldwide.
For over two decades, Tianjin Minjie Steel Co., Ltd. has stood at the forefront of China's structural hollow section engineering and hot-dip galvanizing industry. Operating a state-of-the-art facility spanning more than 70,000 square meters, our strategic location just 40 kilometers from Xingang Port (Tianjin)—the largest and most advanced seaport in Northern China—allows us to offer streamlined logistics, rapid customs clearance, and reduced maritime transport transit times to over 120 global regions.
As a premier manufacturer and exporter, our structural steel catalog features premium rectangular hollow sections (RHS), square hollow sections (SHS), pre-galvanized and hot-dip galvanized steel pipes, welded carbon steel solutions, scaffolding tubes, and structural steel accessories.
Tianjin Minjie Steel integrates smart automation into its workflow to guarantee structural precision and metallurgical consistency. Our production lines feature:
By working with Tier-1 steel mills for raw hot-rolled coils (such as Shougang, Ansteel, and HBIS), we ensure consistent yield strengths, ductility, and chemical compositions (low sulfur and phosphorus content) for materials like Q195, Q235, Q355 / ASTM A500 Gr. B / EN 10219 S355J2H.
“Our integration of smart logistics with optimized manufacturing pathways allows a monthly output exceeding 25,000 tons, assuring dynamic lead times and supply chain reliability during global construction peaks.”
How we are adapting to the next generation of global construction: Green steel, ZAM coatings, and smart profile modeling.
We are reducing our carbon footprint by incorporating electric arc furnace (EAF) steel and hydrogen-reduced iron. Our plants aim to cut energy emissions by 30% by 2028.
We are developing ZAM (Zinc-Aluminum-Magnesium) coatings to replace traditional galvanizing. ZAM provides up to 3x higher corrosion resistance, making it ideal for offshore solar tracking brackets.
By using 3D CNC laser-cutting systems, we deliver square and rectangular tubes ready for assembly. This features precision slotting, drilling, and profiling right out of the box.
From clean energy grids to high-rise commercial structures, Minjie square tubes provide reliable support worldwide.
Our galvanized square pipes are designed for ground-mounted solar tracker assemblies. They withstand high wind loads, saline air, and desert heat.
Engineered for high structural load capacities in multi-story buildings, industrial storage warehouses, and airport terminals using high-tensile Q355B steel.
Pre-galvanized square and rectangular tubes provide long-lasting support for modern multi-span plastic greenhouses, resisting corrosion from fertilizers and moisture.
Exporting structural steel globally requires strict compliance with localized building standards. At Tianjin Minjie Steel, all production cycles follow rigorous quality protocols, ensuring our products meet international specifications:
We also offer third-party testing services (SGS, BV, TUV) to verify zinc coating weights, yield strengths, tensile strengths, and impact energy tolerances before delivery.
We deliver steel solutions across the globe. See how we support our international clients with reliable manufacturing and logistics.
Our team visited clients in Singapore in September 2019 to inspect local project sites and confirm supply schedules for structural steel columns.
In 2019, Korean engineering partners visited our factory to finalize design specs and tolerance limits for custom hollow steel profiles.
Australian construction distributors visited us in late 2018 to audit our quality control, establishing a multi-year supply framework for AS/NZS 1163-certified steel.
Following a factory audit in 2019, an Indian infrastructure firm partnered with us to secure a monthly supply of 10 containers of structural steel pipe.
In June 2017, a Lebanese distributor visited our facility and signed an order for 1,000 tons of ERW and galvanized steel tubes.
After initial discussions at the Canton Fair, Saudi Arabian infrastructure buyers visited Tianjin in 2018 to close a long-term supply agreement.
Tianjin Minjie Steel participates in global industry expos and the semi-annual Canton Fair. These events help us connect with engineering, procurement, and construction (EPC) firms from Europe, the Middle East, Southeast Asia, and the Americas.
Over 80% of our new clients visit our Tianjin manufacturing plant after meeting us at exhibitions. This allows buyers to inspect our raw material storage, high-frequency welding stations, and hot-dip galvanizing lines firsthand, ensuring transparency and building long-term trust.
Take a closer look at our machinery, quality control lab, and warehousing zones in Tianjin, China.
Understanding structural steel chemistry, dimensional profiles, and finishing specifications.
Hot-rolled, cold-rolled, pre-painted (PPGI), and color-coated steel coils suited for industrial profiling and structural cladding systems.
Hot-dipped and pre-galvanized circular options. Features consistent zinc adhesion, smooth threading, and high corrosion protection.
Structural hollow profiles (SHS & RHS) with tight dimensional tolerances, clean weld lines, and stable torsional strength.
Hot-rolled structural angle bars designed for power transmission towers, bridge components, and general metal fabrication projects.
For structural hollow sections, performance depends heavily on geometrical accuracy and steel chemistry. Unlike standard piping used for fluid transport, Square Structural Hollow Sections (SHS) are designed for compressive loads, torsional stress, and bending moments.
A key factor in fabricating high-strength square tubes is controlling the external corner radius (C1/C2). According to EN 10219, the outer corner radius must not exceed:
At Tianjin Minjie, our sizing mills control the roll pressure at the final stage. This maintains a uniform corner radius, preventing localized material stress and keeping the ERW seam aligned away from the critical corner bend zones.
To ensure stable welding in the field, we control the Carbon Equivalent Value (CEV) of our steel alloys. Our Q355B and S355J2H grades are formulated with a CEV ≤ 0.45%, allowing easy welding without the need for pre-heating under normal environmental conditions:
By maintaining lower silicon content during steel refining, we prevent excessive zinc coating growth (Sandelin effect) during hot-dip galvanizing, ensuring a smooth, matte-gray zinc finish that does not easily flake off.
Expert answers to common questions about manufacturing standards, steel grades, corrosion protection, and logistics.
Our manufacturing facility and products undergo regular, independent audits to ensure compliance with global engineering and environmental requirements.
ISO 9001:2015 Approved
CE EN 10219 Standard
SGS Audited Plant
BV Quality Checked
ASTM A500 Verified
Browse our extended inventory of structural steel elements, protective coatings, and industrial pipeline accessories.
Detailed design files and product specifications from actual shipments and partner requests.
Minjie Steel
