Q235B Sch40 Hot-rolled Seamless

Hot Rolled Seamless Steel Pipe – High-Quality Tubing for Industrial Fluid Conveyance and Structural Applications

Our hot rolled seamless steel pipe is a premium-grade, hollow cylindrical product engineered for superior strength, durability, and performance across diverse industrial sectors. Unlike welded alternatives, these pipes are manufactured without seams through a precise hot rolling process that enhances grain refinement, eliminates casting defects, and improves mechanical properties such as tensile strength, ductility, and impact resistance. This makes them ideal for high-pressure fluid transport, structural support systems, and demanding engineering environments worldwide.

These seamless tubes are available in a wide range of outer diameters from 13.7 mm to 914 mm, wall thicknesses between 2 mm and 120 mm, and standard lengths from 2 meters up to 12 meters—customizable to meet exact project specifications. They comply with international standards including ASME B36.10M, ASTM A53/A106/A335, API 5L (PSL1/PSL2), JIS, DIN, GB, and BS, ensuring global compatibility and regulatory compliance. Available in multiple carbon steel grades such as SAE1018, Q235B, St37, S235JR, and more, each batch undergoes rigorous quality control to deliver consistent performance under varying operational conditions.

Key features include customizable end finishes like beveled or plain ends, optional surface treatments such as oil coating, galvanizing, or phosphating for corrosion protection, and the ability to add protective caps or plugs upon request. The manufacturing process involves three distinct stages: extension, perforation, and finishing—ensuring uniformity, reduced internal stress, and enhanced dimensional accuracy. Because the material is processed above its recrystallization temperature, the resulting microstructure exhibits improved homogeneity and directional strength, making it suitable for applications where isotropy is not required but robustness is critical.

These seamless steel pipes find extensive use in oil and gas pipelines, power generation facilities, shipbuilding, construction scaffolding, chemical processing plants, and heavy machinery frameworks. Their versatility supports both low- and medium-pressure boiler systems, serving as steam tubes, smoke tubes, and heat exchanger components. Additionally, they serve as load-bearing elements in infrastructure projects, offering reliable performance in extreme temperatures and pressure environments.

Customers consistently praise the reliability and consistency of our seamless steel pipes, particularly noting their excellent weldability, minimal surface imperfections, and adherence to international standards. Many have reported significant reductions in maintenance costs due to extended service life and superior resistance to fatigue cracking compared to other tubular products on the market.

Frequently asked questions often revolve around customization options, lead times, and third-party verification. We welcome inspections by reputable agencies such as Bureau Veritas (BV) or SGS to ensure transparency and confidence in product quality. Whether you're sourcing for large-scale industrial projects or specialized mechanical components, our hot rolled seamless steel pipe offers unmatched value, precision, and adaptability for modern engineering needs globally.