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Welded steel pipe
Steel pipes, particularly those classified as welded steel pipes, represent a versatile and widely utilized option across numerous industries. These pipes are manufactured from steel plates or strips that are bent and then welded together to form a continuous cylindrical shape. The process of producing welded steel pipes is relatively straightforward, allowing for high output efficiency. This method also offers a broad range of sizes and specifications, making it both economical and adaptable. However, one notable drawback when compared to seamless steel pipes is their typically lower overall strength.
Since the 1930s, advancements in the continuous rolling of high-quality steel strips, coupled with improvements in welding and inspection techniques, have significantly enhanced the reliability and strength of welded pipes. Today, they are increasingly replacing non-ferrous materials in various applications. Welded steel pipes are categorized into two main types: straight-seam welded pipes and spiral-welded pipes. Straight-seam welded pipes boast a simpler production process, faster manufacturing speeds, and lower costs. In contrast, spiral-welded pipes tend to offer greater structural integrity but require longer welds, which slows down production rates. Consequently, straight-seam pipes are commonly used for smaller diameters, while larger diameters often favor spiral-welded designs.
Low-pressure fluid transport welded steel pipes, sometimes referred to as general welded pipes or "black pipes," are primarily designed for transmitting basic fluids like water, gases, oils, and steam. These pipes come in varying wall thicknesses and pipe-end configurations, including smooth and threaded options. Beyond direct fluid transport, these pipes serve as foundational components for galvanized versions, which are commonly known as "white pipes." Galvanized welded steel pipes undergo a hot-dip galvanization process to provide corrosion resistance, making them ideal for applications involving water, gas, and oil distribution.
In the realm of electrical installations, ordinary carbon steel conduit pipes play a critical role by protecting electrical wiring within industrial and residential settings. These conduits ensure safety and compliance with industry standards. Meanwhile, straight-seam electric welded steel pipes, recognized for their parallel weld seams, cater to structural needs in construction and manufacturing sectors. Known for their affordability and adaptability, these pipes are further subdivided into metric and thin-walled varieties.
For applications requiring pressurized fluid conveyance, such as oil and natural gas pipelines, spiral-seam submerged arc welded steel pipes take center stage. Manufactured using hot-rolled steel strip coils, these pipes undergo spiral forming at elevated temperatures before being double-sided submerged arc welded. Their robust construction ensures reliable performance under high-pressure conditions, minimizing maintenance costs over time. Similarly, spiral-seam high-frequency welded steel pipes utilize advanced welding technologies to achieve comparable results in pressurized fluid transportation.
Spiral-welded steel pipes for general low-pressure fluid transport combine durability with ease of fabrication. They excel in scenarios where cost-efficiency meets performance demands without compromising safety. Lastly, spiral-welded steel piles find extensive application in civil engineering projects, including foundations for bridges, piers, and other structures. These piles leverage the inherent strength of steel while ensuring long-term stability and resilience against environmental factors.
Overall, the diversity of welded steel pipes caters to an array of industrial requirements, providing solutions tailored to specific needs while maintaining competitive advantages in terms of affordability and versatility.