National standard spot 3PE spiral steel pipe

　　3PE spiral steel pipe processed by 3PE spiral steel pipe factory has greater flexibility in the size and specification range of diameter and wall thickness, especially in the production of high steel grade thick wall pipe, especially small and medium-sized diameter thick wall pipe, which has incomparable advantages in other processes, and can meet more requirements of users in the specification of spiral steel pipe.

　　Using the advanced double-sided submerged arc welding process, welding can be realized at the best position. It is not easy to have defects such as misalignment, welding deviation and incomplete penetration, and it is easy to control the welding quality.

　　3PE spiral steel pipe factory carries out 100% quality inspection on steel pipes, so that the whole process of steel pipe production is under effective detection and monitoring, effectively ensuring the product quality.

　　All the equipment of the whole production line has the function of networking with the computer data acquisition system to realize real-time data transmission. The central control room will monitor the technical parameters in the production process.

　　The production control of 3PE spiral steel pipe plant is mainly to improve the plasticity of steel pipes, improve the cleanliness of molten steel, reduce harmful impurities, and improve the overall quality of steel pipes. In the production process, select reasonable cooling criteria to prevent internal cracks and improve the quality of steel pipes from various aspects. The heating temperature of spiral steel pipe shall be controlled reasonably in the production process, and the best heating temperature shall be selected by measuring the thermoplastic curve.

　　Pay attention to the satisfied heat preservation time when heating the tube blank to reduce the deformation resistance and improve the plastic resistance of the 45 # thick wall spiral tube.

　　The production process of 3PE spiral steel pipe plant requires many procedures. The final step is to reduce the roll speed, which is the key parameter of the piercing process. In the process of changing the roll speed from low to high, there is a critical roll speed that begins to show delamination.

　　When the roller speed is low, the tube blank simply forms a cavity; When the roller speed is high, the tube blank and 45 # spiral steel pipe simply form the defect of layering.

　　In order to eliminate the layering defect of pipe blank and 45 # structure spiral steel pipe, the construction condition of the inner anti-corrosion layer of 3PE spiral steel pipe unit should be to reduce the roller speed below the critical roller speed at the beginning of layering. Generally, the construction of cement mortar fabric should be carried out after the spiral pipe is laid, the pressure test is qualified, and the soil is compacted according to the plan. During fabric construction, it is necessary to keep the pipeline in a stable condition.

　　If the fabric anti-corrosive coating is made first and then the pipe is laid down, the anti-corrosive coating will be damaged due to the thin wall and small rigidity of the steel pipe and large deformation during lifting, transportation and soil return during construction.