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Yanshan County Southern Industrial Development Zone, Hebei Province
Spiral steel pipe
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- Product Description
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Spiral welded pipes sold directly by Zhongyuan Pipeline Manufacturing Co., Ltd. are produced by helically winding low‑carbon, environmentally friendly carbon steel or low‑alloy steel strips into a pipe billet according to a specific spiral pattern, followed by electric‑arc welding along the seam. They can be manufactured from narrow hot‑rolled strip steel and are used to produce large‑diameter seamless steel pipes. The key product in this category—sold directly by Zhongyuan Pipeline Manufacturing Co., Ltd.—is the spiral submerged‑arc welded pipe, which has been widely employed in China for the construction of various natural gas pipeline networks; its specifications are expressed in terms of diameter and wall thickness. Spiral welded pipes offered by Zhongyuan Pipeline Manufacturing Co., Ltd. are available in both single‑sided and double‑sided weld configurations. Such pipes must undergo pressure testing, and their weld strength and cold‑drawing performance must meet the required standards.
Spiral welded pipes, directly sold by Zhongyuan Pipeline Manufacturing Co., Ltd., are made from two primary materials: steel and iron. Iron is further classified into pig iron and industrial pure iron. Industrial pure iron exhibits excellent ductility and weldability but has relatively poor strength and hardness. Aside from its applications in the electrical industry, it is not widely used in other industrial sectors; thus, most of the iron encountered in daily life refers to pig iron. From a chemical composition standpoint, both steel and pig iron are iron–carbon alloys that also contain elements such as silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S), though in varying proportions. A carbon content of 2% serves as the dividing line between steel and pig iron. Generally, iron–carbon alloys containing 2% to 4.5% carbon are classified as pig iron, while those with 0.02% to 2.0% carbon are termed steel. Alloys with carbon contents below 0.02% are referred to as pure iron.
Due to its excellent physicochemical and mechanical properties, steel can undergo a variety of advanced processing techniques, including rolling, punching, deep drawing, and stamping. Consequently, spiral welded pipes sold directly by Zhongyuan Pipeline Manufacturing Co., Ltd. have a broader range of applications than cast iron. With the exception of foundry-grade pig iron used for producing cast‑iron components, approximately 90% of the pig iron employed in steelmaking is further refined into steel to meet the demands of various industries.
Our Advantages
Smart Manufacturing Capacity Advantage
13 automated pipe‑making lines and 4 anti‑corrosion production lines, with an annual output of one million tons of steel pipes; all large‑diameter sizes are produced in‑house, ensuring stable lead times for bulk deliveries.
Quality and Qualification Advantages
Comprehensive nondestructive testing conducted by an independent laboratory, with dual certification under API and national standards; a long-term approved supplier for central state-owned enterprises, and fully qualified to bid on engineering projects.
Comprehensive Service Advantages
Customized solutions covering the entire oil & gas, municipal, and water‑conservation sectors, offering end‑to‑end support from conceptual design through logistics and after‑sales service, with capabilities for both domestic and international trade exports.
