Large diameter carbon steel pipes generally refer to carbon steel pipes with an outer diameter of no less than 200mm. Made from carbon steel, they are key materials in the industrial and infrastructure sectors due to their high strength, good toughness, and excellent welding properties. Hot rolling and spiral welding are commonly used in their production. Hot rolled steel pipes are widely used in high-pressure applications due to their uniform wall thickness and dense structure.
Customized Specifications: Meet Diverse Project Needs
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.
Application of Large Diameter Carbon Steel Pipe
Large-diameter carbon steel pipe, with its advantages of high strength, high-pressure resistance, easy welding, and cost-effectiveness, has irreplaceable applications in multiple key sectors. These applications can be categorized into three core areas: energy transmission, infrastructure engineering, and industrial production.
Energy transmission: It serves as the "aorta" for oil, gas, and power transmission. Cross-regional oil and gas pipelines (such as the Central Asia Natural Gas Pipeline and the domestic West-East Gas Pipeline) utilize large-diameter carbon steel pipe (mostly with an outer diameter of 800-1400mm).
Infrastructure and municipal engineering: It supports the operation of cities and transportation networks. In municipal water supply and drainage, large-diameter carbon steel pipe (outer diameter 600-2000mm) is the preferred choice for urban main water supply pipes and stormwater drainage pipes due to its corrosion resistance (with a lifespan exceeding 30 years after anti-corrosion coating treatment) and high flow rate.
Industrial production: It serves as the backbone of heavy manufacturing and chemical production. Heavy machinery plants often use large-diameter carbon steel pipes (15-30mm wall thickness) for crane rail supports and large equipment base frames. Their high load-bearing capacity (a single pipe can withstand vertical loads exceeding 50kN) helps stabilize equipment operation.
Market Trends and Industry Outlook: Growing Demand for High-Quality Pipes
Market demand for large-diameter carbon steel pipes is rising steadily alongside global infrastructure, energy, and industrial development. Traditional sectors such as petrochemicals, power transmission, and urban water supply and drainage remain the primary drivers of demand. Demand for large-diameter carbon steel pipes continues to grow in the petrochemical industry, with annual demand projected to reach approximately 3.2 million tons by 2030. This industry relies on large-diameter carbon steel pipes to transport crude oil, refined products, and chemical raw materials.
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City: Tianjin
Country: China
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