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Manufacturing method and temperature control system of perforated plug of seamless steel pipe

A technology of perforated plugs and manufacturing methods, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of excessive alcohol, increased cost, waste of resources, etc., and achieve less consumption of nitrogen and alcohol, good Forgeable performance, the effect of short processing time

Active Publication Date: 2018-09-11
NANTONG JIAYE MACHINERY MFG
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  • Abstract
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  • Application Information

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Problems solved by technology

Therefore, it can be considered that the perforated plug works under low cycle fatigue conditions, so its wear and tear is the main reason affecting the service life
[0003] The prior art has the following defects: First, the 20CrNi4 material used in the steel ingot cannot meet the needs of long life and high strength
However, in this method, the heating method of the steel ingot and the forging temperature and time are not specified, and the quality of the forging cannot be accurately controlled.
Li Zhiguang and others proposed a method for determining the heating time of forgings in the article "Determination of Heating Time for Steel Forgings" (Metal Casting Forging and Welding Technology, July 2010), but this method does not determine the heating temperature and forging time relation
Third, in the process of nitriding and oxidation, too much nitrogen alcohol is used, which wastes resources and also increases costs

Method used

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  • Manufacturing method and temperature control system of perforated plug of seamless steel pipe
  • Manufacturing method and temperature control system of perforated plug of seamless steel pipe
  • Manufacturing method and temperature control system of perforated plug of seamless steel pipe

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0014] In the first embodiment of the present invention, a method for manufacturing a seamless steel pipe perforated plug is provided, see the attached figure 1 , including the following steps:

[0015] Step 1, pre-forging, heating the steel ingot to 150-200°C, and forging it for 5 minutes.

[0016] The steel ingot is made of improved 20CrNi4 material. The chemical composition of the original 20CRNI4 is (by weight): carbon C: 0.10-0.17, silicon Si: 0.17-0.37, manganese Mn: 0.30-0.60, sulfur S: allowable residual content ≤ 0.035, phosphorus P: allowable residual content ≤ 0.03, chromium Cr: 0.60~0.90, nickel Ni: 2.75~3.15, copper Cu: the allowable residual content is ≤0.030. A small amount ...

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Abstract

The invention provides a manufacturing method for a seamless steel pipe piercing plug and a temperature control system of the manufacturing method. The method comprises the following steps that firstly, pre-forging is conducted, a steel ingot is heated to 150 DEG C-200 DEG C, and the steel ingot is forged for 5 min; secondly, after pre-forging, the temperature of the steel ingot is increased to be lower than the superheat temperature of the steel ingot by 20 DEG C-40 DEG C through heating; thirdly, obtained round steel is subjected to heat preservation in the environment with the temperature lower than the superheat temperature of the round steel by 100 DEG C, a blank is manufactured through die forging, the blank is deformed through a die, and a forge piece is obtained; fourthly, heat preservation is conducted on the blank at the temperature of 680 DEG C for 8 h, and air cooling is conducted after furnace cooling is conducted to the temperature of 300 DEG C; and fifthly, the product obtained in the fourth step is subjected to nitrogen treatment at the temperature of 950 DEG C. 20CrNi4 materials of zinc are added in chemical components of the steel ingot. The piercing plug can meet the needed rigidity for piercing and can also have good forging performance, the density and strength of the product are higher, abrasion resistance is better, and the service life of the product is prolonged.

Description

technical field [0001] The invention relates to a method for manufacturing a perforated plug, in particular to a method for manufacturing a high-strength wear-resistant plug for rolling a high-alloy seamless steel pipe, and belongs to the technical field of equipment manufacturing. Background technique [0002] The plug is a key tool in the production of seamless steel pipes. The quality and service life of the tool directly affect the output, quality and economic benefits of the steel pipe production. During the process of piercing the seamless steel pipe of the plug, the solid tube blank is made into a hollow capillary, and the deformation of the metal is mainly carried out on the plug. The working conditions of the perforated plug are quite harsh, not only to bear strong axial pressure, but also to overcome the strong deformation friction generated between the inner wall. Therefore, it can be considered that the perforated plug works under the condition of low cycle fati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/18C22C38/08C23C8/34B21J1/06
CPCB21J1/06C22C38/002C22C38/02C22C38/04C22C38/08C22C38/18C23C8/34
Inventor 吕小军
Owner NANTONG JIAYE MACHINERY MFG
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