Seamless steel pipe is a pipeline widely used to transport fluids, such as natural gas, oil, and water pipelines. Seamless steel pipes can be divided into hot-rolled seamless steel pipes and cold drawn seamless tubing. Hot-rolled seamless steel pipes are also called general steel pipes, which can be divided into low and medium pressure boiler steel pipes. In addition, there are alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes. Cold-rolled seamless steel pipes are not only divided into general steel pipes, low and medium pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes like hot-rolled steel pipes.
Seamless steel pipes are widely used in the manufacture of structural parts and mechanical parts because of their advantages of high pressure resistance, good toughness, long pipe sections and few joints. Such as automobile drive shafts, bicycle frames, oil drill pipes, and steel scaffolds used in construction, etc., use steel pipes to make ring parts. In addition, the rolling bearing rings and jack rings that we often see are all made of seamless steel pipes.
The characteristics of scratches and scratches on seamless steel pipes are that there are vertical and linear scratches of different lengths on the inner and outer surfaces of seamless steel pipes, most of which are groove-shaped, but they may also be raised stripes.
The main cause of scratches and scratches on seamless steel pipes is. There is an inner scratch on the pipe material, which can not be eliminated during drawing, and there are iron oxide scales remaining on the seamless steel pipe. The mold sticks to steel, the strength and hardness of the mold are not enough or uneven, the mold is broken and worn, and the sharp shuttle angle of the transition part of the hammer head damages the mold, etc.
In order to prevent scratches and scratches, the quality of each preparation process before drawing should be improved and the mold with high strength and high hardness and good finish should be improved. When the electroplated seamless steel pipe needs to be stored and transported tightly, proper precautions should be taken to prevent white rust, maintain a low humidity environment around the key parts, and ensure that there is sufficient ventilation between the parts of the stack to reduce white rust. The details are as follows.
1. Surface treatment can reduce the generation of white rust.
2. The coating should be stored in dry and well-ventilated conditions.
3. If the coating can only be stored in the open air, the coating should be separated from the floor by narrow partitions so that air can flow freely to all surfaces of the coating.
4. Do not place coated parts where they may be affected by rain, stomach, condensation and snow.
5. The galvanized steel bottom should be consigned to the surface of the ship or placed on the bottom of the ship to avoid contact with the bilge water during the surge.
Seamless steel pipes are widely used in the manufacture of structural parts and mechanical parts because of their advantages of high pressure resistance, good toughness, long pipe sections and few joints. Such as automobile drive shafts, bicycle frames, oil drill pipes, and steel scaffolds used in construction, etc., use steel pipes to make ring parts. In addition, the rolling bearing rings and jack rings that we often see are all made of seamless steel pipes.
The characteristics of scratches and scratches on seamless steel pipes are that there are vertical and linear scratches of different lengths on the inner and outer surfaces of seamless steel pipes, most of which are groove-shaped, but they may also be raised stripes.
The main cause of scratches and scratches on seamless steel pipes is. There is an inner scratch on the pipe material, which can not be eliminated during drawing, and there are iron oxide scales remaining on the seamless steel pipe. The mold sticks to steel, the strength and hardness of the mold are not enough or uneven, the mold is broken and worn, and the sharp shuttle angle of the transition part of the hammer head damages the mold, etc.
In order to prevent scratches and scratches, the quality of each preparation process before drawing should be improved and the mold with high strength and high hardness and good finish should be improved. When the electroplated seamless steel pipe needs to be stored and transported tightly, proper precautions should be taken to prevent white rust, maintain a low humidity environment around the key parts, and ensure that there is sufficient ventilation between the parts of the stack to reduce white rust. The details are as follows.
1. Surface treatment can reduce the generation of white rust.
2. The coating should be stored in dry and well-ventilated conditions.
3. If the coating can only be stored in the open air, the coating should be separated from the floor by narrow partitions so that air can flow freely to all surfaces of the coating.
4. Do not place coated parts where they may be affected by rain, stomach, condensation and snow.
5. The galvanized steel bottom should be consigned to the surface of the ship or placed on the bottom of the ship to avoid contact with the bilge water during the surge.
