From Raw Material to Finished S355JR Seamless Steel Tubes

The journey of S355JR seamless steel tubes from raw material to finished product is a testament to precision engineering. It begins with carefully selected raw materials, primarily low-carbon steel with a balanced mix of elements like manganese, silicon, and phosphorus. These components ensure S355JR’s hallmark strength and weldability, meeting strict EN 10025-2 standards.

The process starts with smelting, where raw materials are melted in a furnace to create molten steel. This is cast into solid billets, which serve as the foundation for seamless tubes. The billets undergo rigorous quality checks to ensure uniformity and purity. Next, the billets are heated to high temperatures and pierced to form a hollow tube in a process called hot rolling. This seamless technique eliminates welds, enhancing the tube’s structural integrity and strength.

The hollow tubes are then elongated and shaped through a series of rolling mills, achieving precise dimensions and a smooth surface. Heat treatment follows, optimizing the mechanical properties of S355JR, such as its 355 MPa yield strength and impact resistance. Finally, the tubes are cut, inspected, and tested for defects using advanced methods like ultrasonic testing to ensure flawless quality.

From raw steel to finished S355JR seamless steel tubes, each step is meticulously controlled to produce a product that excels in construction, energy, and engineering applications. This seamless process ensures durability, reliability, and performance, making S355JR tubes a cornerstone of modern infrastructure.