Offshore Wind Power Steel Structure Manufacturers

Nantong Sudong Steel Structure Co., Ltd. is a professional Offshore Wind Power manufacturer and supplier based in China, with nearly three decades of experience in heavy steel structure fabrication. We provide custom-engineered steel structures for offshore wind power projects, including transition pieces, tower components, and foundation support structures. Our factory in Nantong operates seven production lines, including six intelligent robotic welding lines and box girder lines, with an annual capacity of 40,000–50,000 tons. We serve global clients—from Fortune 500 companies to independent developers—with a one-stop solution covering design, fabrication, coating, logistics, and installation support.

Our offshore wind power range is built for the demanding marine environment: high fatigue loads, corrosive saltwater exposure, and strict tolerance requirements. We combine advanced manufacturing with rigorous quality control to deliver components that meet international standards such as EN 1090 and ISO 9001.

Our Offshore Wind Power Product Range

We supply a complete set of steel structures for offshore wind farms. Our range includes:

• Transition pieces – connecting monopiles to towers, with precise flange machining and corrosion protection.
• Tower sections – fabricated from heavy plate, with robotic welding for consistent seam quality.
• Foundation components – including jackets, lattice structures, and ancillary brackets.
• Substation platforms – for offshore transformer and switchgear installations.

We also offer related structures such as boat landings, ladders, and cable support systems. Each component is customized to the project’s load case, water depth, and installation method.

Application Fit and Engineering Approach

Offshore wind structures operate under cyclic loading from wind and waves, requiring high-strength steel and meticulous weld detailing. Our engineering team uses TEKLA modeling to develop 3D models, detect clashes, and generate fabrication drawings. We optimize plate thickness and connection design to balance strength and weight, reducing material cost without compromising safety.

Typical applications include:

• Monopile transition pieces for nearshore and far-shore wind farms
• Jacket foundations for deeper water sites
• Transformer platform topsides
• Internal platforms, ladders, and support frames

We work with your design or provide value engineering based on your performance specification.

Materials and Critical Specifications

We select materials based on the corrosive marine environment and fatigue requirements. Common grades include S355, S420, and S460 structural steel, with through-thickness properties where required. Our fabrication processes include:

• CNC cutting with ±0.5 mm accuracy
• Robotic welding for consistent, high-quality seams
• Three-dimensional drilling with hole group accuracy of ±0.3 mm
• Shot blasting and painting to ISO 12944 standards

We ensure traceability from raw material to final assembly, with all key welds subject to non-destructive testing (NDT). Our quality system is certified to ISO 9001, and our products carry EN 1090 CE marking for the European market.

Capacity and Throughput

Our production base covers 50,000 square meters and includes a dedicated steel structure factory, a bridge processing base, and an exterior wall panel company. With seven automated lines, we handle both mass production and flexible custom orders. Our annual capacity of 40,000–50,000 tons allows us to support large-scale offshore wind projects with tight schedules.

We coordinate production planning to match your delivery milestones, ensuring that components arrive on site in the correct sequence for installation.

Configuration Options and Automation Integration

We configure each structure to your specific requirements:

• Flange types – forged or fabricated, with bolted or welded connections
• Coating systems – from standard marine paint to specialized anti-corrosion systems
• Appurtenances – J-tubes, anodes, and access platforms
• Marking and tagging – for traceability and installation

Our robotic welding lines are programmed for high repeatability, and we integrate with your quality control requirements, providing documentation for each weld and inspection step.

Quality Assurance and Acceptance Testing

We implement full-process quality control, from incoming material inspection to final dimensional checks. Our laboratory and third-party partners conduct mechanical testing, chemical analysis, and NDT (ultrasonic, magnetic particle, or radiography) as required. We provide a complete documentation package, including material certificates, weld maps, and inspection reports.

Before shipment, we perform a pre-delivery inspection with you or your representative. We also offer optional third-party inspection to ensure compliance with your project specifications.

Installation and On-Site Support

We provide detailed installation manuals and videos, and our engineers can be dispatched to site for guidance (optional). Our support team is available 24/7 for remote technical assistance. We coordinate logistics to ensure safe and timely delivery, using container, bulk, or rail transport depending on component size and destination.

Maintenance and Lifecycle Service

We offer a 10-year quality guarantee on the main structure and provide lifetime technical consultation. For any quality issues, we respond within 72 hours with a solution. We also supply spare parts and maintenance recommendations to extend the service life of your offshore structures.

Information We Use to Configure Your Solution

To prepare a precise proposal, we need the following project information:

Send us these details via our contact form or email, and we will respond with a preliminary solution within 12 hours on working days.

Why Choose Nantong Sudong as Your Offshore Wind Power Supplier

We are a direct manufacturer, not a trading company, with full control over production quality and delivery. Our certifications include ISO 9001, EN 1090 CE, and GOST, and we have served clients such as CNOOC and China State Construction. Our location near Shanghai Port and Nantong Port ensures efficient logistics for global projects.

Explore our related capabilities: Industrial Construction & Heavy Equipment, Port Machinery & Equipment, and Energy & Chemical.

Frequently Asked Questions