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The production methods used in the past for high-precision cold drawn tubes
The development of high-precision cold drawn tubes has a long history, so its production methods have also undergone many changes, and the overall progress is making progress, making the quality of its products also improved. What was first applied was a production method that combined the annealing process and the cold-drawn steel pipe process.
This kind of in-line annealing mainly consists of an oxidation furnace and a reduction furnace. The strip steel is directly heated to about 450 degrees by the gas flame in the oxidation furnace until the remaining rolling oil on the surface of the strip is burned off to achieve the purpose of surface purification. Then the strip is heated to 700-800 degrees, recrystallization annealing is completed, and the required product is obtained after cooling.
After improvement, an alkaline electrolytic degreasing tank can replace the degreasing function of the oxidation furnace to complete the production of pipes. After the original plate enters the operation line, it is electrolytically degreased, then washed, dried, and then passed through a reduction furnace with protective gas for recrystallization and annealing, and then enters the zinc pot under a sealed condition.
There is also a direct flame heating method. After the strip is degreased by alkali washing, hydrochloric acid is used to remove the oxide scale on the surface. After being washed and dried, it enters a vertical in-line annealing furnace directly heated by a gas flame. By strictly controlling the combustion ratio of gas and air in the furnace, incomplete combustion is performed, thereby creating a reducing atmosphere in the furnace.
This kind of production process is complicated. The main reason is that when the unit stops running, in order to prevent the strip from burning, the furnace needs to be moved laterally away from the steel strip. This has many operational problems, so not many cold-drawn steel pipe industries use this method.
However, due to serious equipment corrosion, which resulted in high equipment maintenance and update costs, it has not been widely promoted.
Please indicate the source for reprinting:http://www.cbtea.cn
This kind of in-line annealing mainly consists of an oxidation furnace and a reduction furnace. The strip steel is directly heated to about 450 degrees by the gas flame in the oxidation furnace until the remaining rolling oil on the surface of the strip is burned off to achieve the purpose of surface purification. Then the strip is heated to 700-800 degrees, recrystallization annealing is completed, and the required product is obtained after cooling.
After improvement, an alkaline electrolytic degreasing tank can replace the degreasing function of the oxidation furnace to complete the production of pipes. After the original plate enters the operation line, it is electrolytically degreased, then washed, dried, and then passed through a reduction furnace with protective gas for recrystallization and annealing, and then enters the zinc pot under a sealed condition.
There is also a direct flame heating method. After the strip is degreased by alkali washing, hydrochloric acid is used to remove the oxide scale on the surface. After being washed and dried, it enters a vertical in-line annealing furnace directly heated by a gas flame. By strictly controlling the combustion ratio of gas and air in the furnace, incomplete combustion is performed, thereby creating a reducing atmosphere in the furnace.
This kind of production process is complicated. The main reason is that when the unit stops running, in order to prevent the strip from burning, the furnace needs to be moved laterally away from the steel strip. This has many operational problems, so not many cold-drawn steel pipe industries use this method.
However, due to serious equipment corrosion, which resulted in high equipment maintenance and update costs, it has not been widely promoted.
Please indicate the source for reprinting:http://www.cbtea.cn