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80,000㎡ Steel Structure Fabrication Base
500,000-ton annual capacity equipped with automated lines and 100% NDT traceability
Automated Manufacturing Facility
Annual Capacity
International Professionals
(Non-Destructive Testing) Traceability
How We Remove Site Risk Before the Steel Ships
Zero Layout Errors
We eliminate manual measuring tapes. Complex 3D models developed by our Tekla detailers are converted into DSTV machine code and fed directly via fiber optics to our CNC laser cutters and 3D drilling lines, locking fabrication tolerances to within 1mm.
100% Traceability
We maintain comprehensive digital and physical archives. Through systematic batch indexing, every component is seamlessly linked to its original MTC, Welder ID, and NDT reports, ensuring complete lifecycle accountability.
Zero-Missing Handover
We understand the catastrophic costs of overseas site delays. All complex structural nodes undergo physical in-house Trial Assembly. Every component is match-marked and scanned against the digital packing list prior to containerization. When it arrives at your site, it assembles like LEGO—with zero missing bolts.
Our Engineering Journey
Manufacturing Foundation Established
Founded Henan Hengfeng Steel Structure Engineering Co., Ltd. as a dedicated fabrication base, specializing in structural detailing and heavy fabrication for domestic infrastructure and cross-border engineering projects.
ISO 9001, 14001 & 45001 Certified
Achieved ISO 9001 quality, ISO 14001 environmental and ISO 45001 occupational health & safety certification, building a standardized system for fabrication quality, safety and compliance on every export project.
1,000+ Export Projects Fabricated
Delivered over 1,000 exported steelwork projects as the core fabrication partner of international trading firms, validating our capacity and quality control at scale.
Transition to Direct EPC Contracting
Established Shandong Shijie Heavy Industry Co., Ltd. to contract directly with international clients, removing intermediaries for direct technical communication and cost optimization.
500+ Projects Exported & Erected Independently
Surpassed 500 structural projects exported and erected under our own contracts, confirming our position as a direct-to-client steel partner from design to installation.
Export Footprint Reaches 60+ Countries
Extended our verified export footprint to more than 60 countries across Asia, the Middle East, Africa and Latin America.
SynJect International Brand Launched
Integrating large-scale fabrication capacity with full-lifecycle engineering services to deliver “Engineering Certainty” to global contractors.
Qualification Certificate
Your projects are protected by world-class standards. From CE (EN 1090) to ISO 9001, our qualifications are not just paper—they are the rigorous daily reality on our shop floor.
From Blueprint to Site. Zero Friction.
Detailed Engineering
Utilizing advanced BIM platforms such as Tekla Structures, detailed 3D modeling and shop drawings are executed strictly in compliance with AISC 360 or Eurocode 3 (EN 1993). Connection designs are rigorously verified, with manufacturing drawings generated to ISO 2768-m tolerance standards. 100% clash detection with primary architectural and MEP systems is performed to ensure zero structural conflicts during field erection.
Nesting & Material Optimization
Intelligent nesting layouts are performed using advanced software like FastCAM/SigmaNEST in accordance with EN 10029 / ASTM A6 dimensional standards. Accounting for cutting kerf (2mm–5mm depending on plate thickness) and thermal contraction allowances, raw material utilization exceeds 92%. Offcuts are digitally barcode-tracked to ensure 100% mill test report (MTR) traceability.
Raw Material Incoming Inspection
All structural steel (Q355B/C/D, ASTM A572 Gr.50, S355JR/J2) must be accompanied by EN 10204 3.1 Mill Test Reports (MTR). Incoming quality control conducts 100% dimensional and visual inspections under ASTM A6 / EN 10029, verifying thickness tolerances (Class A/B) and internal lamination integrity via Ultrasonic Testing (UT) to ASTM A435. Chemical composition and mechanical properties are spot-verified by accredited 3rd-party labs.
CNC Cutting & Edge Preparation
Plate profiling and component cutting are executed via CNC oxy-fuel, high-definition plasma, and multi-kW fiber laser equipment. Cut surface quality strictly complies with EN ISO 9013 for perpendicularity and surface roughness ±2.5°, Range 3/4 tolerance). Multi-axis CNC beveling machines execute weld prep bevel angles within ±2.5° and root face dimensions within ±1.0 mm.
Primary Structural Welding
Welding is performed exclusively by AWS D1.1 or EN ISO 9606 certified welders using qualified Welding Procedure Specifications (WPS) supported by Procedure Qualification Records (PQR) per AWS D1.1 / ISO 15614. Submerged Arc Welding (SAW) and Flux-Cored Arc Welding (FCAW) dominate Complete Joint Penetration (CJP) and fillet welds. Heat input is strictly controlled, achieving weld quality levels conforming to ISO 5817 Quality Level B or AWS D1.1 standards.
Weld Distortion Straightening
Post-weld angular distortion, camber, and sweep are rectified using automated hydraulic flange straighteners and controlled thermal flame straightening. Heating temperatures for High-Strength Low-Alloy (HSLA) steels are strictly maintained between 600℃ - 650℃ (air-cooled, zero water quenching) to prevent microstructural degradation. Post-straightening straightness tolerances meet ±3 mm, conforming to EN 1090-2 Execution Class 2 (EXC2/EXC3) and AISC COSP standards.
Non-Destructive Testing (NDT)
NDT protocols are operated by ISO 9712 / ASNT Level II certified NDT personnel. 100% of critical Complete Joint Penetration (CJP) welds undergo Ultrasonic Testing (UT per ISO 17640 / ASTM E164) or Magnetic Particle Testing (MT per ISO 17638 / ASTM E709). Radiographic Testing (RT) is applied as requested for heavy sections. Weld acceptance conforms strictly to ISO 11666 Acceptance Level 1 or AWS D1.1 criteria.
Trial Assembly & Shop Alignment
Complex geometries, long-span trusses, and heavy framing undergo 1:1 physical trial assembly or high-precision 3D laser scanning virtual assembly per EN 1090-2 / AISC requirements. Bolt hole alignment is verified (≥ 95% free-pass rate for high-strength bolts), and critical dimensions (span, camber, 3D spatial alignment) are verified within tight tolerance limits (±2.0 mm) to eliminate site fitting risks.
Surface Preparation & Protective Coating
Structural members undergo automated shot blasting to achieve SSPC-SP10 / NACE No. 2 / ISO 8501-1 Sa 2.5 cleanliness, with a surface profile (anchor depth) of 45–75μm. High-performance protective coatings are applied using airless spray technology in compliance with ISO 12944 (C3 to CX corrosive environments), featuring Inorganic/Organic Zinc-Rich Epoxy Primers, Epoxy Micaceous Iron Oxide Intermediate coats, and Polyurethane/Fluorocarbon Topcoats. Dry Film Thickness (DFT) is verified using calibrated magnetic gauges adhering strictly to the 90/10 rule.
Final Quality Inspection & Certification
Final Quality Control (FQC) performs a comprehensive holistic audit, inspecting paint aesthetics (zero runs, pinholes, sagging), critical geometry, bolt hole pitches, and laser/stenciled component mark traceability. A complete Manufacturing Data Report (MDR)—comprising MTRs, NDT records, coating inspection logs, and Certificates of Conformance—is compiled to support CE Marking (DoP under EN 1090) and AISC final acceptance.
Export Packaging & Logistics Protection
Protective packaging is engineered for containerized (40HQ/OT/FR) and breakbulk ocean freight under heavy maritime transit conditions. Structural members are bundled on heavy-duty steel skids with high-tensile steel strapping. Machined connections and contact surfaces are wrapped with VCI anti-corrosion film, EPE foam padding, and heavy rubber cushions. All timber packing complies fully with ISPM 15 phytosanitary standards and IMO Cargo Stowage and Securing (CSS) rules.
Global Field Erection & Site Management
We deliver international site erection supervision and turnkey EPCM construction services adhering to OSHA 1926 safety protocols, AISC COSP, and EN 1090-2 erection standards. Field teams, led by multilingual HSE and QA/QC engineers, utilize high-precision total stations to maintain structural plumbness within H/1000$ (≤25mm max). High-Strength Structural Bolting is executed via calibrated Wrench or Turn-of-Nut methods with 100% torque audit documentation.
The Third-Party Reality
We operate in an open-door environment with global auditors like SGS, TÜV, and BV. We provide full access to our NDT labs, material records, and coating bays to guarantee zero-defect shipment.
Proven Steelwork Across Industries
See how our massive fabrication capacity translates into delivered success for industrial, commercial, and infrastructure projects worldwide
Factory & Quality Assurance FAQs
Are you a direct manufacturer or a trading company?
We are a 100% direct manufacturer. SynJect (Shandong Shijie Heave Industry Co., Ltd) operates an 80,000㎡ heavy fabrication facility in Jining City, Shandong, China. When you partner with us, you are communicating directly with the factory floor. This eliminates middleman markups, ensures faster communication, and gives you absolute control over your project timeline.
Do you allow third-party inspections before shipment?
Absolutely. We maintain a policy of 100% transparency. We frequently work with international third-party inspectors like SGS, TUV, and BV. We provide them with full access to our NDT reports, material testing labs, and in-house trial assembly areas to verify your structural steel before it leaves our gates. You are also welcome to book a virtual or on-site factory tour anytime.
With large mega-projects, will my order be subcontracted to smaller workshops?
Never. Subcontracting destroys quality control. With an annual capacity of 500,000 tons, we have the immense internal scale required to digest mega-projects. Every single beam, column, and truss is fabricated, welded, and inspected strictly within our own ISO9001 & ISO14001 & ISO45001-certified facility to guarantee absolute quality consistency.
Welding is the lifeblood of heavy structures. How do you guarantee weld integrity?
We treat welding with the highest level of scrutiny. All our welders are certified to CE EN1090 standards. For critical Complete Joint Penetration (CJP) welds, our certified NDT engineers conduct 100% Ultrasonic Testing (UT) or Magnetic Particle Testing (MT). The complete NDT flaw-detection reports will be handed over to you in your final Technical Dossier.
How can I be sure the raw steel matches my engineering requirements?
Traceability is key. We source our raw materials strictly from China’s top-tier state-owned steel mills. Every steel batch is accompanied by an original Mill Test Certificate (MTC). Our incoming quality control (IQC) team rigorously cross-checks the chemical composition and yield strength, ensuring 100% material traceability from the raw steel plate to your finished building framework.
Get Your 24-Hour BOQ and Cost Plan
See how much steel tonnage and ocean freight you can save before fabrication begins
Steel Weight Savings
1:1 Tekla 3D modeling optimizes beam-column ratios to eliminate redundant material costs.
Zero-Clash Code Verification
Checked against EN 1090 and local wind/seismic loads.
Engineer-to-Engineer Review
Verified by our lead engineers—Zero pushy sales calls, Just actionable data and factory price.
CE EN 1090-1•ISO 9001•ISO 14001•ISO 45001
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