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View DetailsTianjin Minjie Steel Co., Ltd. was established in 1998. Spanning a state-of-the-art facility of over 70,000 square meters, our strategic infrastructure is located just 40 kilometers from XinGang Port, the single largest maritime trade port in Northern China. This unique geographic placement grants our global procurement partners an unmatched logistical advantage, minimizing domestic transit time and costs.
As a leading manufacturer and exporter, we operate a sophisticated production plant specializing in high-grade pre-galvanized steel pipe, hot-dip galvanized pipe, welded steel pipe, square & rectangular hollow structural sections, and comprehensive scaffolding systems. Driven by engineering excellence, our research division has secured 3 structural patents: specialized grooved pipes, shoulder-type pipes, and high-performance victaulic pipe joints, engineered for complex industrial fluid and gas transmission.
Our industrial plant incorporates 4 pre-galvanized processing lines, 8 Electric Resistance Welded (ERW) steel tube production lines, and 3 hot-dipped galvanizing process lines, all operating under rigid adherence to international standards including GB, ASTM, DIN, and JIS. Underpinning every workflow is our ISO 9001 quality assurance protocol, securing premium consistency from billet sourcing to final shipment.
Unlocking unparalleled mechanical integrity, cost efficiency, and massive production scalability in modern steel infrastructure.
Utilizing high-purity zinc coatings up to 500 g/m² in hot-dip processes. Our lines generate a robust zinc-iron alloy layer that provides superior atmospheric and underground corrosion resistance, ideal for severe maritime and industrial environments.
Whether you require standard round tubes, square hollow sections (SHS), rectangular hollow sections (RHS), or custom-milled SS400 structural steel angle bars, our mills integrate inline profiling and length cutting to precise tolerances.
We build structural steel products conforming to ASTM A53, BS 1387, EN 10219, and JIS G3444, offering certified traceability certificates for chemical properties and mechanical testing (yield, tensile, elongation, and hydrostatic test verification).
How our steel profiles and pipes empower energy, heavy civil construction, agriculture, and manufacturing globally.
In energy networks, gas pipelines require exceptional internal pressure resistance and leak-proof configurations. Our ASTM A53 and BS 1387 galvanized steel pipes are hydrostatically tested to withstand extreme municipal and industrial pressures. The incorporation of grooved and victaulic connections allows rapid field deployment without hot work permits.
Energy & UtilitiesModern skyscrapers and bridge construction rely on scaffolding tubes capable of load-bearing safety margins. Our Q235 and Q345 grade steel pipes, paired with precision coupler fittings, offer predictable yield strength and excellent resistance to buckling, keeping vertical systems rigid and worker environments safe under dynamic wind and structural loads.
Infrastructure ConstructionAgricultural microclimates subject steel tubes to continuous high humidity and chemical fertilizers. Our pre-galvanized and zinc-aluminum-magnesium structural pipes protect structural skeletons against premature oxidation, extending structural lifespan to over 20 years in highly corrosive crop growth zones.
Modern AgricultureAligning chemical and mechanical properties with your project's specific mechanical criteria.
| Steel Grade | Yield Strength (Min) | Tensile Strength (Min) | Main Applications | Key Standards Conformance |
|---|---|---|---|---|
| Q235 / SS400 | 235 MPa | 370 - 500 MPa | Structural framing, general construction, scaffolding tubes, angle bars | GB/T 700, JIS G3101, ASTM A36 |
| Q345 / S355 | 345 MPa | 470 - 630 MPa | Heavy structural hollow sections, high load scaffolding, oil transport | GB/T 1591, EN 10025, ASTM A572 |
| ASTM A53 Grade B | 240 MPa | 415 MPa | High pressure fluid systems, steam pipelines, industrial oil distribution | ASTM A53, ASME SA53 |
| BS 1387 Medium | 215 MPa | 320 - 460 MPa | Water piping systems, fire sprinkler networks, general mechanical conduit | BS 1387 (EN 10255) |
With an annual yield surpassing 300,000 tons, our factory runs automated production to satisfy large-scale project timelines.
Every batch is tracked and certified. We implement continuous quality checks, including ultrasonic and eddy current testing.
ISO 9001:2015 System Certification
International Quality Standards Certificate
Building strong strategic partnerships through plant audits, localized technical consultations, and transparent communication.
In September 2019, our delegation traveled to Singapore to consult directly with local structural engineers, securing excellent feedback for custom pre-fabricated structures.
During a 2019 manufacturing plant visit, Korean structural experts audited our automated milling systems to establish custom designs for complex building skeletons.
In November 2018, long-term Australian procurement partners audited our cold-forming machines and hot-dip galvanizing lines to verify batch compliance.
Following a detailed mill evaluation in 2019, Indian clients selected our plant as their structural profile provider, signing recurring monthly shipments.
During their mid-2017 technical audit, Lebanese mechanical designers finalized an immediate purchase order for 1,000 metric tons of gas conduit pipes.
Having connected at the Canton Fair, our Saudi Arabian clients audited the factory in 2018 to launch custom heavy-duty hollow section production lines.
Tianjin Minjie Steel maintains a proud presence at the Canton Fair every year. These events provide opportunities to connect directly with global buyers. In recent iterations, over 80% of our booth visitors traveled to our Tianjin factory to conduct on-site audits, selecting our services to support their industrial, logistics, and infrastructural developments.
Discover our main structural configurations, manufactured using high-quality billets and modern finishing lines.
Hot Dipped Galvanized Steel Coil, Prepainted Galvanized Steel Coil (PPGI), Color-coated strip.
Hot Dipped Galvanized Steel Pipe, Pre-Galvanized Steel Pipe, Zinc-Aluminum Steel Pipe.
Square Steel Pipe, Rectangular Steel Pipe, Galvanized Square Steel Pipe.
Hot Rolled Equal Angle Bar, Hot Rolled Unequal Angle, Galvanized Angle Steel.
A testament to our structural reliability and ability to supply heavy structural components on schedule.
Common questions answered by our metallurgical engineers and supply chain specialists.
Pre-galvanized pipes are manufactured from steel strips that have already been zinc-coated via a continuous galvanizing line, yielding a uniform coating of 60-120 g/m². Hot-dip galvanized pipes are fabricated from black steel tubes and subsequently dipped in a molten zinc bath, yielding a much thicker protective layer (300-500 g/m²) suited for high-exposure outdoor settings.
We perform comprehensive mechanical testing (tensile, yield, and elongation), chemical composition analyses, hydrostatic testing, and ultrasonic weld line inspection under ISO 9001 quality guidelines. We supply Mill Test Certificates (MTC) conforming to EN 10204 3.1 for all batches.
Our company holds 3 national patents, specifically for grooved joints, shoulder-ended pipes, and victaulic connections. These configurations facilitate rapid site installation for HVAC, industrial drainage, and gas transport networks.
Located just 40 kilometers from XinGang Port—the largest commercial port in Northern China—our proximity dramatically reduces overland transit times, minimizes inland freight tariffs, and guarantees efficient loading of export containers.
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Minjie Steel
