World's Largest Seamless Pipe Mill China
Hengyang Valin has partnered with Danieli to build what will become the world’s largest seamless pipe mill in China. The project marks a major step in China’s move toward advanced steel production and higher self-sufficiency in critical pipe supply. Startup is scheduled for 2026.
New Project Aims for Global Leadership
The new facility is designed to serve fast-growing demand in infrastructure, energy, and industrial sectors. It focuses on large-diameter seamless pipes, which are essential for high-pressure and long-distance applications. The mill represents a significant upgrade in China’s manufacturing capabilities and positions the country to strengthen its global market presence.
Advanced SDM Cutting Lines from Danieli
Danieli will supply two SDM cutting lines for the project. One line will perform billet cutting for upstream preparation. The other line will execute tube layer cutting for completed pipe sections. These systems integrate with the mill’s FQM™ retained mandrel production line to ensure precision and consistent dimensional accuracy.
Automation solutions from Danieli will manage process control, production sequencing, and quality assurance. This increases stability across all stages of the operation.
Impressive Production Capacity and Specifications
The mill targets an annual capacity exceeding 800,000 tons of seamless pipes. It will support pipe diameters ranging from 323.8 mm to 610 mm, with wall thicknesses up to 65 mm. These capabilities address market demand for heavy-duty steel pipes used in deepwell drilling, power generation, and energy transmission.
The project is expected to reduce reliance on imported large-diameter pipes and strengthen local supply chains for strategic sectors.
High-Performance Equipment and Control Systems
Each cutting line features vertical sawing units, cut-to-length modules, hydraulic stations, and automatic crop removal. These components support accurate cutting, clean finishes, and efficient waste discharge.
Danieli Automation’s digital systems will oversee the full production flow, ensuring consistent quality and optimized cycle times. This integration enhances both reliability and productivity.
Strategic Value for China’s Steel Industry
The project aligns with China’s broader industrial and energy strategies. As national infrastructure investment increases, demand for high-quality seamless pipes continues to rise. With this new mill, China will gain a stronger position in global steel pipe trade and reinforce its capabilities in producing value-added products.
The facility’s location also supports efficient distribution to domestic regions and export markets. Commissioning activities will begin after equipment installation, with commercial operations planned in 2026.
Technical Advancements and Production Methods
The mill will use the FQM™ retained mandrel process. This method delivers precise wall thickness and superior mechanical properties. It is widely recognized for producing high-quality seamless pipes.
Danieli’s SDM cutting lines further enhance production efficiency. Their faster cycle times and stable cutting performance support a high-volume operation, which is essential for a facility of this scale.
Industry Impact and Economic Significance
The project reflects strong confidence in long-term pipe demand. Energy transition projects, new pipelines, and infrastructure upgrades continue to drive global consumption of large-diameter seamless pipes.
The mill will create advanced manufacturing jobs and support the development of related industries. It also strengthens China’s standing in global steel manufacturing and enhances technological capabilities across the sector.
FAQS
1.What makes this the world’s largest seamless pipe mill?
Its annual capacity of more than 800,000 tons and ability to produce pipes up to 610 mm in diameter make it the largest facility of its kind.
2.Who are the main partners in the project?
Hengyang Valin owns the project, and Danieli will supply the SDM cutting lines and automation systems.
3.When will the mill begin operations?
Production startup is scheduled for 2026 after installation and commissioning.
4.What types of pipes will the mill produce?
It will manufacture large-diameter seamless steel pipes used in oil and gas, power generation, and construction projects.
5.Why are seamless pipes important?
They contain no weld seams, offering higher strength and reliability for high-pressure and extreme-condition applications.
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