Large-diameter Q235 Round Carbon Steel Welded Pipe

Material Properties and Industrial Applications of Q235 Carbon Steel Straight Seam Welded Pipe

Q235 carbon steel pipe is one of the most commonly used structural steel materials in my country's industrial sector. Its excellent comprehensive performance makes it crucial in fields such as construction, machinery manufacturing, and pipeline engineering. The relatively simple smelting process and low production cost of Q235 steel give it a competitive advantage in price-sensitive projects. It is worth noting that although Q235 steel is not specifically designed for pressure vessels, its extensive application experience and wide supply mean it is still widely used in pressure vessel manufacturing in non-high-pressure applications.

Price Trends in the Large-Diameter Carbon Steel Pipe Market

In 2025, the large-diameter carbon steel pipe market exhibited a clear price stratification, with the mainstream price range ranging from 3400 yuan to 9070 yuan/ton. Price differences primarily stemmed from variations in materials, specifications, and processing precision. Taking Q235B as an example, its market price was approximately 3600 to 4000 yuan/ton, making it an economical choice for building structures and mechanical frames.

Specifications also significantly impacted prices. The combination of outer diameter and wall thickness directly determines the amount of material used and the processing difficulty. Increased wall thickness significantly increased material costs.

Key Technologies for Welding Large-Diameter Carbon Steel Pipes

The welding quality of large-diameter Q235 carbon steel pipes directly affects the safety and service life of the pipeline system; therefore, strict control must be exercised throughout the entire welding process. A typical welding process includes four key stages: pre-weld preparation, root pass welding, fill pass welding, and cap pass welding.

During welding, special attention should be paid to controlling the interpass temperature; if the temperature does not meet the requirements, the weld should be reheated.

For overhead welding of large-diameter pipes, a low-speed welding method should be used to prevent molten pool overflow.

Post-weld treatment is equally important. The weld should be cooled slowly. Typically, a composite slow-cooling device consisting of asbestos blankets and felt is used to wrap the weld for at least half an hour.

About us

We are a professional steel export trading company, relying on high-quality domestic steel mill resources, focusing on providing global customers with structural pipes, fluid pipes, and European standard profiles. We provide reliable steel solutions for infrastructure and manufacturing projects in Southeast Asia, the Middle East, and Europe, and are committed to becoming your trusted international trading partner.

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