Pitting and pits are common surface quality problems in seamless steel tube manufacturing. For pitting and pits in delivery, if this happens, many manufacturers will say that it is due to the quality problems of the initial round steel plant that lead to the generation of this problem.
The selection of round steel for seamless steel tube manufacturing may have an impact, but it is not the final determinant. The real reason is that this process —– perforation
1. Many manufacturers for the perforating furnace equipment selection, is not reasonable, short perforating furnace, so that the round steel can not be heated evenly, resulting in higher internal and external temperature deviation, affect the change of the structure, resulting in pitting, pits phenomenon.
2. The setting of the top, general manufacturers for the use of inferior top, top spray water directly contact with the inner and outer surface of the high temperature steel pipe, steel pipe meets a large temperature difference, resulting in the formation of internal and external defects, namely warping or pits.
3. In perforating furnace equipment, small factories do not pay attention to environmental protection and temperature control, for different steel seamless pipe, can not adjust the adaptability of temperature in time, and then change the steel surface and internal structure, resulting in warping, pits phenomenon.
We should pay attention to the selection of perforating furnace equipment, good equipment can avoid the seamless steel tube production process of pitting, pits phenomenon, speed up production, at the same time reduce a certain delivery cycle, long perforating furnace, so that the round steel heat evenly, low internal and external temperature deviation, followed by the use of high quality top, although the cost is high, but perforated out of the capillary tube, no warping, pits, From the source to eliminate the surface quality problems that may be encountered in post-processing. Finally, the use of good natural gas Settings, environmental protection and pollution-free, for different steel numbers will have different temperature control, so as to avoid warping, pits phenomenon.
Post time: Jan-11-2023