The forming process of steel bending pipe and how to prevent aging of steel bending pipe

First, the forming process of steel bending pipe

1. Die forging. For socket welding and threaded tees, crosses, elbows, and other small pipe fittings, the shapes are more complicated and should be manufactured by the die forging process. The die forging blank should be a rolled profile, such as bars, thick-walled pipes, or plates. When steel ingots are used as raw materials, the steel ingots should be pre-rolled into strips or used as die forging blanks after forging to eliminate the segregation, looseness, and other defects of the steel ingots. After heating, the blank is placed in the forging die, and the pressure makes the metal flow. Fill the die cavity; flashing will occur after the blank is forged, and the remaining flashing material needs to be flushed out to complete all forging work.

2. Free forging. Pipe fittings with special shapes or not suitable for die forging can be manufactured by the free forging process. The general shape of the pipe fittings should be free forged, such as the tee branch pipe should be forged.

3. Cutting processing. For some tubular pipe fittings, such as double socket joints, movable joints, etc., rods or thick-walled pipes can be directly processed. During the processing, the fiber flow direction of the metal material should be roughly parallel to the axial direction of the pipe. For tees, crosses, elbows, and pipe fittings, rods are not allowed to be directly cut and formed.

Second, methods to prevent steel bending pipe aging

There are many types of steel bending pipes, and there are many use environments and contact materials. The length of the pipe life mainly depends on its anti-aging ability. Due to the influence of the material, the anti-aging effect of some pipes may not be obvious. This method can achieve the anti-aging of the pipe:

1. During the laying process, it is very important to overcome the axial deformation caused by seasonal temperature differences and control thermal expansion.

2. When connecting the hot-melt electric welded pipe to the metal pipe and cement pressure pipe, the bend should be firmly pasted. To avoid changes in axial force due to temperature changes in the material, thereby affecting the sealing performance, the serpentine laying of the hot-melt electric fusion pipe is within the allowable range of the plan to meet the needs of pipe temperature changes.

3. Blue pipes or black pipes can be used to extrude blue ribbons. The latter usually has better anti-ultraviolet and anti-aging properties. Protective covers are also recommended for public use. Pipes should be kept away from direct sunlight during transportation and storage, and the on-site placement time should be very short.

Therefore, users should also try to prevent pipe aging when using steel bending pipes, such as avoiding sunlight exposure and wrapping the pipes with anti-corrosion tape to protect the service life of the pipes.