Industrial high-strength seamless hot-finished black steel tube 139.7x6.3 is a premium engineering solution designed for heavy-duty structural applications and high-pressure environments. Manufactured from elite fine-grain steel grades P355NHTC1 and S355J2H through the seamless hot deformation process, this pipe ensures a monolithic structure with superior mechanical integrity. With an outer diameter of 139.7 mm and a 6.3 mm wall thickness, it provides an exceptional strength-to-weight ratio, making it ideal for critical infrastructure projects, heavy machinery components, and complex industrial pipelines where traditional welded pipes cannot meet safety margins.

The product is fully certified under EN 10216 and EN 10210 standards with 3.1 + CE certification. The P355NHTC1 grade is specifically engineered for pressure purposes and elevated temperature service, offering excellent yield strength and impact toughness. Simultaneously, the S355J2H grade provides outstanding structural performance, making this tube perfect for load-bearing frameworks, crane booms, and bridge construction. The seamless technology eliminates the risk of longitudinal failure, ensuring absolute reliability under dynamic loads and internal pressure spikes. Its untreated black surface is ready for professional industrial coating or anti-corrosive protection depending on the project environment.

We offer this high-performance profile from our strategic stock locations in Europe, including Poland, Bulgaria, and Ukraine. Wholesale pricing is available for orders starting from 1 ton. Our service centers provide high-precision band-saw cutting to deliver exact lengths tailored to your technical specifications. Choosing this 139.7x6.3 seamless pipe ensures compliance with the most rigorous European safety and quality standards. Contact our technical sales team today for a comprehensive commercial proposal, material certificates, and logistical solutions for your project. We guarantee the highest metallurgical quality and reliable supply chains.