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The weld of the large-diameter lsaw steel pipe for piling is longer than the weld of the straight pipe of the same specification, and the pressure of the spiral steel pipe under the same specification wall thickness. The defect of the weld of the spiral steel pipe is "oblique defect". In the course of use, the main stress direction of the steel pipe with large-diameter straight-slit steel pipe for piling, the equivalent defect length of the large-diameter straight seam steel pipe in the axial direction of the pile is smaller than that of the straight seam pipe; secondly, since the pipeline steel is rolled steel plate, the impact The toughness has a large anisotropy, and the CVN value in the rolling direction can be three times higher than the CVN value perpendicular to the rolling direction.Spiral steel pipe in the process of making spiral welded pipe, should pay attention to the following problems: 1, oiling marking: in the inspection of qualified spiral steel pipe oiling operation to prevent corrosion, and according to customer requirements for marking. 2. Leveling and milling: The original crimped steel plate is leveled by an anvil machine, and the two edges of the steel plate are double-sided milled by a milling machine to achieve the required plate width, parallelism of the edge and the shape of the groove. 3. Shear forming: The steel plate is spirally rolled into a tubular shape along the outer edge. Large-diameter straight seam steel pipe for pilingUrban drainage water spiral steel pipe is mainly used as a water pipeline. The material is Q235B, and the implementation standard is sy/t5037, also known as the standard spiral steel pipe. * Near-spiral steel pipe has many demand highlights in the pipeline field. Housing construction and municipal engineering still provide stable domestic demand, but there are short-term regulatory pressures. The water conservancy construction policy strongly supports the use of large-diameter straight seam steel pipes for piling to greatly increase the demand for pipelines.The spiral steel pipe industry, as the basic industry for water conservancy construction, will surely become the beneficiary of *. The construction of rural drinking water safety system for large-diameter straight-slit steel pipe and the upgrading of spiral steel pipe for building materials to the countryside. The large-diameter straight-seam steel pipe for piling takes into account the potential of China's rural market and has not yet been excavated. The development space of the spiral steel pipe industry is undoubtedly broader.The gas supply system and heating consumption trend will also bring about an increase in demand. China has established a pipeline application industry mainly consisting of large-diameter spiral steel pipe, thick-walled spiral steel pipe and anti-corrosion spiral steel pipe. These three types of material products occupy spiral steel pipe. The main supply ratio of the industry. The supporting industrial chain of anti-corrosion spiral steel pipe is perfected and supported by domestic raw materials, making anti-corrosion spiral steel pipe occupy half of the market in recent years. With the upgrading of consumption and the promotion of chemical materials, the future of China's large-diameter spiral steel pipe, thick-walled spiral steel pipe and anti-corrosion spiral steel pipe will increase demand.
Piling,With,Large,Caliber,LSAW