The seamless pipe mill in Shandong recently conducted an analysis comparing straight seam steel pipes and spiral steel pipes, both of which fall under the category of welded steel pipes. These types of pipes are extensively utilized across various sectors of national production and construction. Despite their shared applications, there are distinct differences in their production processes and characteristics. Below, we will explore the key distinctions between straight seam steel pipes and spiral steel pipes.
Straight seam welded pipes are manufactured using relatively straightforward processes. High-frequency welding and submerged arc welding are the primary techniques for producing these pipes. Due to their simpler manufacturing methods, straight seam pipes tend to offer higher production efficiency, lower costs, and faster development cycles. On the other hand, spiral welded pipes generally exhibit greater strength compared to their longitudinal counterparts. Submerged arc welding is typically employed in the production of spiral steel pipes. One notable advantage of spiral pipes is their ability to fabricate welded pipes with varying diameters from the same width of raw material. Even narrower strips can be used to create larger diameter pipes. However, compared to straight seam pipes of the same length, spiral pipes have a longer weld seam—approximately 30 to 100% longer—and they operate at slower production speeds. As a result, smaller diameter welded pipes often favor straight seam welding, while larger diameter pipes opt for spiral welding.
In certain industries, particularly those requiring large-diameter straight seam steel pipes, T-welding technology is sometimes applied. This involves joining shorter lengths of straight seam steel pipes to achieve the desired project length. While this approach offers flexibility, it also introduces a heightened risk of defects in the T-welded sections. Additionally, the welding residual stress at the seams tends to be significant, and the weld metal frequently exists in a three-dimensional stress state, thereby increasing the likelihood of cracking.
This analysis highlights the diverse applications and technical considerations associated with straight seam and spiral steel pipes. Each type serves specific needs based on factors such as diameter requirements, strength demands, and production constraints. Understanding these differences is crucial for selecting the most appropriate pipe type for any given project.
This detailed examination provides valuable insights into the practical aspects of choosing between straight seam and spiral steel pipes. Whether for construction projects or industrial applications, selecting the right pipe type ensures optimal performance, safety, and cost-efficiency. Further research into these materials and their applications could help refine selection criteria and improve overall outcomes in various industries.
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