A kind of preparation method of 20crni4 material perforated plug
A perforated plug and material technology, which is applied in the field of metal material processing, can solve problems such as plug cracking and instability, and achieve the effects of eliminating internal stress, prolonging service life, and improving strength and wear resistance
Inactive Publication Date: 2016-11-30
JIANGSU HAOYU ALLOY MACHINERY
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Problems solved by technology
[0002] The plug is used for perforation in the steel pipe production process. The stainless steel pipe is perforated with a molybdenum plug. The low-alloy steel and carbon steel pipes are all made of 20CrNi4 or 15CrNi3MoW. Casting molding, the perforation life of each plug is no more than 300 steel pipes, and it is extremely unstable. Few of them only perforate dozens of steel pipes. The perforation life of most plugs is 150-220 steel pipes, and the average life is only about 180. The plug is scrapped mostly cracked
Method used
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Experimental program
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Effect test
Embodiment
[0021] The preparation method of a perforated plug made of 20CrNi4 material described in this embodiment comprises the following steps: preparing material--casting ingot--electroslag remelting--forging--annealing--finishing--carburizing--removing Stress annealing.
[0022] The specific steps are:
[0023] (1) Prepare raw materials: use 20CrNi4 material shavings, check the metal element content of the shavings, and prepare the metal elements that need to be added;
[0024] (2) Ingot casting: Melt the shavings in an AOD furnace, refine them, add metal elements, make the composition of the molten steel qualified, keep the temperature of the molten steel at 1640°C, remove the surface scum, and then pour the molten steel into the ladle for 30 seconds. Pouring at a temperature of 1620°C, pour molten steel into a square steel ingot mold, and cast a square steel ingot with a diagonal size of 100-800mm. After the square steel ingot is cast, keep it warm in the steel ingot mold for 24 ...
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Abstract
The invention discloses a method for preparing a 20CrNi4 piercing plug. The method comprises the following steps: preparing materials, carrying out ingot casting, carrying out electroslag remelting, forging, annealing, carrying out finish machining, carburizing and carrying out stress relief annealing. According to the method, an AOD furnace is adopted to smelt shavings, so that decarburized refining can be achieved, and the quality of molten steel is high; the piercing plug is prepared through carrying out ingot casting, carrying out electroslag remelting and then forging, so that the piercing plug is high in quality, the service life of the piercing plug is prolonged by 3 times, the number of times of replacement of the piercing plug during steel tube production is reduced, the productivity of labor is increased, and the cost of piercing is reduced; the cost is very low, the circular utilization can be achieved, and a circular industry chain is formed, so that the manufacturing cost of the piercing plug is reduced, and the economic benefit is improved.
Description
technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a method for preparing a perforated plug made of 20CrNi4 material. Background technique [0002] The plug is used for perforation in the steel pipe production process. The stainless steel pipe is perforated with a molybdenum plug. The low alloy steel and carbon steel pipes are all made of 20CrNi4 or 15CrNi3MoW. Casting molding, the perforation life of each plug is no more than 300 steel pipes, and it is extremely unstable. Few of them only perforate dozens of steel pipes. The perforation life of most plugs is 150-220 steel pipes, and the average life is only about 180. The plug is scrapped Mostly cracked. Contents of the invention [0003] In order to solve the above problems, the present invention discloses a method for preparing a perforated plug made of 20CrNi4 material. The shavings made of 20CrNi4 are used to cast a square ingot in an AOD fur...
Claims
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IPC IPC(8): B23P15/00C22B9/18C21C7/068C21D8/00
CPCB23P15/00C21C7/0685C21D8/00C22B9/18
Inventor 曹明刚
Owner JIANGSU HAOYU ALLOY MACHINERY