Advantages and disadvantages of hot dip galvanized steel?

Hot-dip galvanized steel pipe is a hot-dip galvanized steel pipe made by bending a strip or a coil plate in a helical shape and welding the inner seam and the outer seam with double-sided submerged arc welding, which can be widely applied to water for the following reasons , Electricity, chemical and other industries: 1) As long as the change of forming angle, you can use the same width of the strip production of various caliber steel pipe, easy to adjust. 2) Because it is a continuous bending shape, so the length of the coil length is not limited, the length can be arbitrarily set. 3) Spiral weld evenly distributed in the entire spiral pipe circumference, so the spiral pipe size and high precision, strength is also strong. 4) easy to change the size, suitable for small batch, multi-species spiral tube production. Hot-dip galvanized steel pipe weld than the same specifications of straight seam pipe length, the same specifications wall thickness, hot-dip galvanized steel pipe to withstand the greatest pressure. Hot dip galvanized steel pipe weld defects "oblique defects." In the process of using, the main stress direction of the steel pipe, ie, the equivalent defect length in the direction of the steel pipe axis is smaller than that of the straight seam pipe. Secondly, since the pipeline steel is both rolled steel plate, the impact toughness has larger anisotropy, The CVN value in the direction may be 3 times higher than the CVN value perpendicular to the rolling direction.