Explore our elite class of structural pipes, scaffolding walkways, and specialized structural steel configurations engineered for global compliance.
Established in 1998, Tianjin Minjie Steel Co., Ltd. has developed into a critical manufacturing hub in Northern China. Located strategically just 40 kilometers from XinGang Port (Tianjin)—the largest port facility in Northern China—the company guarantees rapid container processing and minimized overland logistics times for large-scale international consignments.
Covering an expansive manufacturing footprint of over 70,000 square meters, our facilities integrate advanced heavy machinery, structural testing zones, and comprehensive quality assurance centers. Driven by an engineering philosophy focused on structural reliability, we design, test, and manufacture to meet the stringent demands of modern heavy industry.
Under the brand Bibosch Intelligent, we deploy a comprehensive product pipeline comprising pre-galvanized steel pipes, hot-dip galvanized pipes, high-frequency longitudinal welded (ERW) steel pipes, structural square & rectangular hollow sections, and safety-certified scaffolding systems.
Understanding structural load demands, corrosion factors, and regulatory challenges in modern high-density construction and heavy engineering sectors.
High-density infrastructure requires mechanical systems capable of withstand extreme stress vectors. High-yield structural steel like Q235B and Q345B sections form the structural backbone of airports, logistics hubs, and commercial skyscrapers.
Industrial square and rectangular profiles (SHS & RHS) form structural frameworks for automated conveyor systems, agricultural vehicles, and cargo cranes. Exact wall thicknesses and weld integrity are critical to structural life cycles.
Commercial greenhouse structures demand localized corrosion resistance. High-deposition pre-galvanized pipes ensure stability in chemical-rich and humid agricultural environments, guaranteeing decade-long operations without maintenance.
Engineering tailored structural packages designed to simplify construction workflows, optimize material utilization, and enforce project safety parameters.
Combining BS EN 39 certified GI scaffolding tubes with precision structural walking planks with safety hook locking mechanisms. Engineered to support high static and dynamic load vectors, this solution is critical for petrochemical, shipbuilding, and commercial high-rise construction scaffolding.
Utilizing high-deposition hot-dip galvanized C-beams, angle steels, and structural pipes. Our components resist atmospheric corrosion in coastal and desert solar farms, ensuring stability over 25+ year project lifecycles.
Specifically cold-formed and high-frequency welded to meet EN 10219 and ASTM A500 specifications. Designed for mechanical structural engineering, automotive bodies, material handling rigs, and high-frequency vibrations.
Driving quality assurance through state-of-the-art ERW processing, precision galvanization lines, and metallurgical testing protocols.
Our manufacturing complex houses modern high-tech production infrastructure: 4 dedicated pre-galvanization processing lines, 8 longitudinal high-frequency ERW welded steel pipe mills, and 3 complete hot-dip zinc-dipping plants. Our thermal zinc-deposition processes allow us to target zinc thickness weights up to 600g/m² depending on specification requirements.
Our engineering research group holds 3 structural pipe design patents:
Quality testing is integrated into our process. We perform computerized eddy-current flaw detection, hydrostatic pressure tests, mechanical tensile and yield tests, and coating weight calculations to guarantee total compliance with international standards.
| Steel Grade & Code | Standards Compliance | Typical Applications | Tensile Strength (MPa) | Yield Strength (Min MPa) |
|---|---|---|---|---|
| Q195 / Q235B | GB/T 13793, ASTM A53, EN 10219 | Scaffolding, Structural framework, Greenhouse supports | 370 - 500 | 235 |
| Q345B / Q355 | GB/T 1591, ASTM A500 Gr. C | Heavy engineering, Cranes, Structural columns | 470 - 630 | 345 |
| SS400 | JIS G3101, JIS G3444 | Infrastructure, Civil framing, Machinery mounts | 400 - 510 | 245 |
| S235JR / S355JR | BS EN 10025, BS EN 39 | Structural framing, Access Scaffolding lines | 360 - 510 | 235 / 355 |
A visual tour through our raw material storage yard, automated hot-dip galvanizing lines, tube rolling mills, and export packaging facilities.
Engineered structural solutions categorized by geometry and surface finishes to meet specific environmental and mechanical challenges.
Every mill run, batch, and structural cross-section undergoes verification to maintain compliance with ISO9001 and international safety standards.
We believe that safety is non-negotiable in civil and structural engineering. Our manufacturing facilities are certified to ISO9001 Quality Management System standards. We support SGS, TUV, and BV third-party inspection processes to verify dimensional tolerances, coating thickness, and yield strength before shipping.
Partnering with leading construction firms and distributors worldwide. Our steel tubes and scaffolding solutions support projects across Europe, Oceania, Asia, and the Middle East.
Our Singaporean partners visited our manufacturing plant in September 2019 to finalize a structural framework contract. They praised our customized structural tolerances and strict process controls.
In 2019, Korean industrial engineers visited our plant to coordinate customized structural profiles for pre-engineered machinery housings, establishing a long-term supply agreement.
A long-term Australian logistics and scaffolding partner visited in November 2018. They confirmed our high-deposition hot-dip galvanized coating processes for coastal-grade structures.
Indian industrial distributors selected our facility after touring multiple manufacturing sites, immediately securing a contract for 10 structural container loads per month.
Every year, Tianjin Minjie Steel showcases its latest structural innovations at the Canton Fair. Our exhibition booths attract structural engineers, building material distributors, and procurement managers from around the world.
Over 80% of our new clients visit our Tianjin manufacturing plant after meeting at the fair. This transparency helps them verify our production capacities, technological investments, and quality control systems in person.
We work closely with global infrastructure suppliers and structural engineering groups. Our partner network includes recognized supply-chain brands:
Technical specifications and load testing metrics from our recent global supply contracts.
Precision painted structural rectangular sections designed for high-stress automated machinery frames.
Grade: S235JR / S355JR
Heavy-load scaffolding tubes meeting Q235B low carbon structural requirements for high-rise platforms.
Standard: BS EN 39 / Q235B
Corrosion-resistant structural pipes engineered for deep-ground perimeter fencing and civil pilings.
Coating: Hot-dip Galvanized
Medium-class galvanized utility pipes with standardized thread and coupling systems.
Thread: Threaded & Coupled
Tianjin high-deposition zinc ERW structural pipes for civil building frames.
Yield Strength: > 235 MPa
Designed for large industrial support structures and processing equipment frames.
Weld factor: 1.0 (Tested)
Large diameter spiral welded pipes designed for municipal drainage and deep civil pilings.
Diameter Range: Up to 2020mm
Round structural carbon steel pipe with consistent hot-dip galvanized coating, perfect for plumbing and fencing applications.
Coating Mass: > 300 g/m²
High-yield structural black steel tubes, optimized for processing equipment, structural roof trusses, and heavy load structures.
Standard: ASTM A53 / Q345BGet authoritative answers on material choices, corrosion standards, and structural load calculations directly from our engineering team.
Pre-galvanized pipes are formed using steel strips that have already been zinc-coated at the mill, providing a uniform, smooth finish with a zinc weight typically between 40-120g/m². Hot-dip galvanized pipes are fabricated as black steel first and then submerged in a molten zinc bath, creating a thicker coating (typically 200-500g/m²) that is better suited for harsh outdoor environments.
For heavy structures, we use high-yield strength steel grades like Q345B (equivalent to S355JR under EN standards or Grade C under ASTM A500). For standard construction framing and scaffolding, Q235B (equivalent to S235JR or ASTM A53 Grade B) provides the necessary ductility and weldability for structural safety.
Our BS EN 39 scaffolding pipes are manufactured with a specific wall thickness tolerance (typically 3.2mm or 4.0mm) and external diameter (48.3mm). They undergo flattening tests, weld line testing, and mechanical stress checks to ensure they can handle dynamic loads on multi-story work platforms without bending.
Our patented groove and shoulder pipe systems are engineered for rapid connection without on-site welding. These designs are ideal for mining operations, temporary water distribution, and agricultural irrigation, reducing assembly time by up to 50% while maintaining leak-proof joints under pressure.
Our manufacturing facility is located in Tianjin, just 40 kilometers from XinGang Port—the largest port in Northern China. This proximity reduces overland transport times, lowers local shipping costs, and helps us maintain reliable delivery schedules for container shipments worldwide.
Yes, we support and provide Mill Test Certificates (MTC) matching EN 10204 3.1 standards. We welcome international inspection agencies like SGS, TUV, and BV to conduct on-site testing for chemical composition, mechanical yield strength, and coating thickness before shipping.
A comprehensive selection of structural sections, angle irons, and coated hollow profiles engineered to meet strict international standards.
Minjie Steel
