The scar deficiency in the anticorrosive steel pipe is the concave pit in the inside of the steel pipe, similar to the size of soybean grains. Most scars are gray -brown or gray -black foreign objects. The influencing factors of internal scars are: deoxidants, injection processes, and smooth core axis. Let 's take a look at the inner surface defects of how to control the inner surface defects of anti -corrosion steel pipes with anticorrosive steel pipe manufacturers:
1. When the oxygen core rod is pre -perforated, the oxide is required to be melted. Strict requirements such as strength.
1) The particle size of the deoxye powder is usually controlled at 16 mesh.
2) The content of sodium sodium in the dehydration agent should reach more than 12%to fully incinerate in the inner cavity of the capillary.
3) Determine the injection of the deoxidant according to the inner surface area of the capillary, usually 1.5-2.0g/dm2, and the deoxidant dose of the capillary of different diameter and length is different.
2. Jet process parameters
1) The spraying pressure should be matched with the diameter and length of the capillary tube, which not only guarantees strong blowing and sufficient incineration, but also prevents the non -completely incinerated deoxida blowing away by the capillary. air flow.
2) The scanning time should be adjusted according to the direction and length of the capillary tube, and the suspended metal oxides in the capillary can no longer be accurate.
3) The height of the nozzle should be adjusted according to the diameter of the capillary tube to ensure a good right. Each shift is organized, and the nozzle is removed after a long period of time. In order to ensure that the dehydration agent is uniformly scanned on the inner wall of the capillary, the spray deoxidant station uses optional device and is equipped with rotating air pressure.
3. Smooth core stick
If the core stick is not good or the temperature of the core stick is insufficient, internal scars will appear. In order to increase the temperature of the core stick, you can use only one kind of cooling water cooling.
During the production process, the core stick temperature should be strictly controlled, and the surface temperature of the core rod before the lubricant is 80-120 ° C, and the core stick temperature is not higher than 120 ° C. For a long time, to ensure that the lubricant on the surface before the pre -pores is dry and dense. The operator usually checks the smoothness of the core axis.
