Large-diameter carbon steel pipe specifications are defined by outer diameter, wall thickness, length, and material grade. Outer diameters typically range from 200 mm to 3000 mm. Such large sizes enable them to transport large fluid flows and provide structural support, essential for large-scale projects.

Hot-rolled steel pipe stands out for its production process advantages: high-temperature rolling transforms steel billets into pipes with uniform wall thickness and dense internal structure. Its outer diameter tolerance can be controlled within ±0.5%, making it suitable for projects with stringent dimensional requirements, such as steam pipes in large thermal power plants and urban centralized heating networks.

Q235 carbon steel pipe and A36 carbon steel pipe have clear specification boundaries for different material grades.

1.Q235 steel pipe: Q235 steel pipe is a common carbon structural steel pipe in China. With a yield strength of 235 MPa, it is commonly produced in wall thicknesses of 8-20 mm and is primarily used for low-pressure fluid transportation applications, such as municipal water supply and drainage, and general industrial gas pipelines.

2.A36 carbon steel pipe: A36 carbon steel pipe is the mainstream steel grade in the international market. It has a slightly higher yield strength (250MPa) and better ductility. Its large-diameter version (usually with an outer diameter of 500mm or more) is widely used in oil and gas gathering and transportation pipelines, which need to withstand certain pressure and temperature fluctuations.