Q345 large-diameter spiral steel pipe

Q345 large-diameter spiral steel pipe is a general term, generally referring to Q345 large-diameter spiral steel pipe with a diameter greater than 1 meter.

Q345 large-diameter spiral steel pipe is made of steel strip after bending and then welding. Steel pipes are subject to water pressure, bending, and flattening tests, which have certain requirements for surface quality. Usually, the delivery length is 12 meters, and delivery is often required to be made to length.

The specifications of Q345 large-diameter spiral steel pipes are expressed in nominal diameters (mm). The nominal diameters are different from the actual ones. According to the specified wall thickness, there are two types of ordinary steel pipes and thickened steel pipes.

Reasons for the misalignment of Q345 large-diameter spiral steel pipes:
During the production of Q345 large-diameter spiral steel pipe, misalignment occurs from time to time, and there are many influencing factors. In production practice, the steel pipe is often downgraded due to the wrong side and out of tolerance. Therefore, it is necessary to analyze the causes of Q345 large-diameter spiral steel pipe misalignment and its preventive measures. the
1. The sickle bend of the steel strip is the main factor causing the misalignment of the steel pipe. In the forming of spiral welded pipe, the sickle bend of the steel strip will constantly change the forming angle, resulting in changes in the weld gap, resulting in slits, misalignment or even lapping. Seriously affect the quality of the steel pipe, so observe the camber of the steel strip coil after uncoiling, through the control of the vertical roller, the disc shear can remove part of the camber and the continuous control and correction of the forming angle is to reduce the camber of the steel strip during the production process. Efficient way to generate wrong edges. the
2. Due to the poor shape and dimensional accuracy of the head and tail of the untrimmed steel strip, it is easy to cause the steel strip to bend hard during butt jointing and cause misalignment. the
3. When the butt welding seam reinforcement of the head and tail of the steel strip is relatively large, if it is not handled properly during overforming, it is easy to cause a large misalignment. the
4. The poor condition of the edge of the steel strip is another important reason for the wrong edge.

Q345 large-diameter spiral steel pipe is mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction.

---