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Heat treatment method of steel pipe jacking head

A heat treatment method and technology of a heat treatment furnace, applied in the field of heat treatment, can solve the problems that the compactness of the plug protective film is not very high, and the wear resistance and service life of the plug cannot be satisfied, so as to improve the service life, improve the compactness, and improve the wear resistance. sexual effect

Pending Publication Date: 2020-04-21
朗瑞(泰州)金属工具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention has improved the high-temperature wear resistance and service life of the plug, but the compactness of the protective film of the plug is not very high, resulting in that the wear resistance and service life of the plug still cannot meet the needs of the enterprise. How to better Improving the compactness and integrity of the plug protective film, thereby improving the wear resistance of the plug, the life of the plug, and saving the investment cost of the enterprise has always been a problem that plagues the plug manufacturing enterprises.

Method used

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  • Heat treatment method of steel pipe jacking head

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Embodiment 1

[0010] A heat treatment method for a steel pipe plug. After the plug is initially processed and formed, the plug needs to be oxidized on the surface, and the plug is placed in a heat treatment furnace under a wet oxidizing atmosphere formed by an organic liquid and a gas compound. The N2, CO 2 , NH 3 and methanol that enter the furnace are formed by pyrolysis. The feed rate of N 2 is 2 liters / min, the feed rate of CO2 is 2 liters / min, the feed rate of NH 3 is 2 liters / min, methanol Aqueous solution (methanol: water = 0.05: 0.5) feed rate 4cm 3 / min, humidity control at 15%; heating furnace average heating rate 3 ℃ / min, add to 950 ℃ for 3 hours, then cool, the average cooling rate is 6 ℃ / min, when the plug is cooled to 300°C, it will be out of the furnace. After the plug is out of the furnace, a layer of oxide film will be formed on the surface, which is bright in silver color. Because the plug is just formed, the surface needs to be polished, so the surface is machined with ...

Embodiment 2

[0012] A heat treatment method for a steel pipe plug. After the plug is initially processed and formed, the plug needs to be oxidized on the surface, and the plug is placed in a heat treatment furnace under a wet oxidizing atmosphere formed by an organic liquid and a gas compound. The N2, CO2, NH3 and methanol in the furnace are formed by pyrolysis. The feed rate of N2 is 6 liters / min, the feed rate of CO2 is 6 liters / min, and the feed rate of NH3 is 6 liters / min. Methanol: water = 0.05: 0.5) feed rate 5cm 3 / min, humidity control at 15%; heating furnace average temperature rise rate 3 ℃ / min, add to 900 ℃ and keep warm for 4 hours, then cool, the average cooling rate is 6 ℃ / min When the plug is cooled to 300°C, it will be out of the furnace. After the plug is out of the furnace, a layer of oxide film will be formed on the surface, which is bright in silver color. Because the plug is just formed, the surface needs to be polished, so the surface is machined with a processing...

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Abstract

The invention discloses a heat treatment method of a steel pipe jacking head. The heat treatment method comprises the steps of S1, primary oxidation; S2, machining; S3, secondary oxidation; S4, coating; S5, dipping; S6, heating; and S7, hot extrusion. The method has the beneficial effects that 1, the wear resistance of the jacking head is good, the compactness of a surface oxidation film is good,and the service life is long; and 2, the integrity of an oxidation protection film of the jacking head in the manufacturing process is ensured.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a heat treatment method for a steel pipe plug. Background technique [0002] Plugs for piercing and rolling are used to produce metal pipes (seamless pipes) by piercing and rolling a round billet of a heated metal raw material. The plug is arranged on the pass line of the piercing mill, and penetrates the billet along the central axis of the billet, and the billet is rotated in the circumferential direction by two inclined rolls facing each other across the pass line. At this time, the plug is in contact with the blank and is subjected to heat and stress from the blank, so its surface is easy to wear and melt, and its service life is low. Chinese patent CN91107554.2 discloses a controllable atmosphere heat treatment for a high-temperature wear-resistant plug The method includes passing organic liquids and gas compounds such as N2, CO2, NH3 and methanol into the heat treatment furnace, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/18C23C14/06C23C16/34C23C22/46C21D9/00C21D1/74
CPCC23C8/18C23C14/0641C23C16/34C23C22/46C21D9/0068C21D1/74
Inventor 洪杰洪军
Owner 朗瑞(泰州)金属工具有限公司
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