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Spiral-welded steel pipes are suitable for corrosion protection of various steel structures, sluice gates, gas storage tanks, docks, ships, and equipment in refineries and chemical plants, as well as for waterproofing and leak prevention in concrete structures such as sewage ponds, concrete pipes, rooftop waterproofing layers, basements, and bathrooms. They are also widely used for external corrosion protection of underground or submerged steel pipelines transporting gas, oil, heat, and water.
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Spiral-welded steel pipes are suitable for corrosion protection of various steel structures, sluice gates, gas storage tanks, docks, ships, and equipment in refineries and chemical plants, as well as for waterproofing and leak prevention in concrete structures such as sewage ponds, concrete pipes, rooftop waterproofing layers, basements, and bathrooms. They are also widely used for external corrosion protection of underground or submerged steel pipelines transporting gas, oil, heat, and water.
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Spiral-welded steel pipes are suitable for corrosion protection of various steel structures, sluice gates, gas storage tanks, docks, ships, and equipment in refineries and chemical plants, as well as for waterproofing and leak prevention in concrete structures such as sewage ponds, concrete pipes, rooftop waterproofing layers, basements, and bathrooms. They are also widely used for external corrosion protection of underground or submerged steel pipelines transporting gas, oil, heat, and water.
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Spiral-welded steel pipes are suitable for corrosion protection of various steel structures, sluice gates, gas storage tanks, docks, ships, and equipment in refineries and chemical plants, as well as for waterproofing and leak prevention in concrete structures such as sewage ponds, concrete pipes, rooftop waterproofing layers, basements, and bathrooms. They are also widely used for external corrosion protection of underground or submerged steel pipelines transporting gas, oil, heat, and water.
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Spiral-welded steel pipes are suitable for corrosion protection of various steel structures, sluice gates, gas storage tanks, docks, ships, and equipment in refineries and chemical plants, as well as for waterproofing and leak prevention in concrete structures such as sewage ponds, concrete pipes, rooftop waterproofing layers, basements, and bathrooms. They are also widely used for external corrosion protection of underground or submerged steel pipelines transporting gas, oil, heat, and water.
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Before leaving the factory, spiral steel pipes shall undergo mechanical property testing, flattening tests, and flaring tests, and must meet the requirements specified in the relevant standards before being released. The quality inspection methods for spiral steel pipes are as follows: 1. Visual inspection, i.e., external examination. Visual inspection of weld joints is a simple yet widely used method and an essential part of final‑product inspection, primarily aimed at identifying surface defects and dimensional deviations in the welds. Typically, this is performed with the naked eye, aided by standard templates, gauges, and magnifying glasses. If surface defects are found, it can be reasonably assumed that internal defects may also be present. Spiral Steel Pipes – Hebei Spiral Steel Pipes – Spiral Steel Pipe Manufacturer
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Spiral-welded steel pipes are suitable for corrosion protection of various steel structures, sluice gates, gas storage tanks, docks, ships, and equipment in refineries and chemical plants, as well as for waterproofing and leak prevention in concrete structures such as sewage ponds, concrete pipes, rooftop waterproofing layers, basements, and bathrooms. They are also widely used for external corrosion protection of underground or submerged steel pipelines transporting gas, oil, heat, and water.
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The manufacturing methods for anti-corrosion steel pipes are generally categorized into the winding type and the round-mold wrapping type. Today, countries around the world place great emphasis on research into corrosion control, and significant progress has been made in the field of pipeline anti-corrosion coatings. With no new materials or technologies emerging, anti-corrosion steel pipes have become a standard method for protecting underground long-distance pipelines. The outer surface is treated using hot‑melt winding technology, forming a three‑layer epoxy anti-corrosion coating: an inner adhesive layer and an outer polyethylene protective layer. The inner surface employs a thermal spray process with epoxy powder; the powder is heated and melted at high temperatures before being uniformly applied to the pipe’s surface, creating a steel–plastic alloy layer.
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The base materials for anti-corrosion steel pipes include spiral-welded steel pipes, seamless steel pipes, and straight-seam steel pipes. These pipes are coated with a three-layer polyethylene anti-corrosion system, offering excellent corrosion resistance. Thanks to their superior water- and gas‑impermeability as well as robust mechanical properties, they are widely employed in the petroleum pipeline industry. The pipe surfaces undergo various pre‑treatment processes, and all pipes are subjected to internal pressure during manufacturing. Applications of anti-corrosion steel pipes: Their base materials comprise spiral‑welded, straight‑seam, and seamless pipes, making them extensively used in the petroleum, chemical, and natural gas sectors. They also find extensive application in thermal power generation, wastewater treatment, water supply systems, bridge construction, steel structures, and offshore pile‑driving projects. Additionally, they are suitable for high‑rise building water supply, district heating networks, and self‑supporting systems.
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3PE‑coated steel pipe refers to an externally coated steel pipe with a three‑layer polyethylene protective system, a commonly used corrosion‑resistant pipeline in the petroleum industry. The outer layer of 3PE‑coated steel pipe is a high‑density polyethylene anti‑corrosion coating; the intermediate layer consists of a copolymer adhesive containing functional groups with branching structures; and the innermost layer is an epoxy powder coating that directly contacts the steel pipe surface. 3PE‑reinforced grade corrosion‑resistant steel pipes are widely applied and produced in large quantities, primarily serving as pipelines for fluid transport or as structural components. Standard‑grade 3PE‑coated steel pipes are typically manufactured from alloy structural steels, ordinary carbon structural steels, or low‑alloy structural steels.
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During the fabrication of longitudinal spiral welded pipes, weld‑seam processing is fundamental to the product. Weld‑seam treatments are generally categorized into three types. Below, we will examine the weld seams encountered during fabrication: 1) All welds in branch pipes; 2) Longitudinal seams in the pipe wall; 3) Circumferential seams of the pipe; 4) Closed circumferential seams formed by crimping; and 5) Welds between diaphragms and the pipe wall. When these welds are inspected using ultrasonic testing, the inspection rate is 50%; radiographic inspection yields a 5% inspection rate; and the quality requirement is B1.
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The production process for spiral welded steel pipes manufactured by Hebei Spiral Steel Pipe Factory (Zhongyuan Pipeline Manufacturing Co., Ltd.) is as follows: 1. Inspect raw materials: steel strip coils, welding wire, and welding equipment. 2. After straightening, shearing, planing, and rolling, the steel strip undergoes preliminary forming. 3. At Hebei Spiral Steel Pipe Factory (Zhongyuan Pipeline Manufacturing Co., Ltd.), the spiral welded pipe’s weld gap is precisely controlled, and the diameter of the bare pipe during forming is adjusted. 4. An automatic double-sided submerged-arc welding machine is used to weld the formed pipe. 5. The pipe diameter is measured, and the weld seams are manually inspected.
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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.
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Bending in the fabrication of spiral‑welded steel pipes: Sheet material can be bent through 180°; however, to minimize cracking on the curved surface, the bend radius should be at least twice the plate thickness. For thick plates, the bend radius is specified twice—once along the rolling direction and perpendicular to it. In welding applications, a bend radius of four times the plate thickness is recommended. To prevent cracking during fabrication, the weld area should be ground smooth. As for repairing cracks in spiral‑welded pipes, stainless steel with heat‑resistant properties is often employed. This material exhibits excellent oxidation resistance and corrosion resistance, making it well suited for alkali‑service piping in ion‑membrane electrolysis. Nevertheless, due to the stringent technical requirements of the material, any deficiencies—such as incomplete alloying elements in the base metal, inadequate filler materials, improper welding procedures, adverse operating conditions, corrosive media within the pipeline, or residual working stresses—can lead to serious defects and pose significant safety risks. Therefore, crack repair remains an effective maintenance approach.
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Processing and welding of spiral welded pipes: Prior to welding, remove rust, oil, water, paint, and any other contaminants that could adversely affect the weld. Select electrodes appropriate for the steel grade. The inter‑spot‑welding time interval should be shorter than that for carbon steel; therefore, use a spiral‑welded‑pipe brush when removing slag. After welding, to prevent localized corrosion or loss of strength, grind or clean the surface.
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