Preparation method of composite rare earth oxide reinforced molybdenum alloy piercing mandrel

A technology of compounding rare earths and oxides, which is applied to other manufacturing equipment/tools, turbines, engine components, etc., can solve the problems of reduced service life of the plug, sticking steel, thick pier, etc., to increase the recrystallization temperature, reduce the turning cost, Effect of improving high temperature hardness

Active Publication Date: 2015-04-15
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In such a harsh working environment of high temperature, high pressure and rapid cooling and rapid heating, molybdenum alloy plugs are subjected to the combined effects of mechanical fatigue and thermal fatigue, and are prone to failure forms such as collapse, thick pier, sticking steel, and cracking, resulting in the use of plugs. The service life is reduced, which seriously affects the forming quality, production cost and efficiency of the steel pipe
[0003] In order to solve the above problems, the conventional method uses TZM alloy (zirconium-titanium-molybdenum alloy) to prepare the plug. The mechanism of action is to form a small amount of carbide elements in solid solution in the molybdenum matrix, thereby increasing the recrystallization temperature and strength of the molybdenum alloy. However, the molybdenum alloy plug The working environment is extremely harsh, and the molybdenum base itself is a brittle material. The TZM alloy plug has the defect of being easy to crack or even break under the huge torque of the rolling rod.

Method used

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  • Preparation method of composite rare earth oxide reinforced molybdenum alloy piercing mandrel
  • Preparation method of composite rare earth oxide reinforced molybdenum alloy piercing mandrel
  • Preparation method of composite rare earth oxide reinforced molybdenum alloy piercing mandrel

Examples

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Embodiment 1

[0031] The method for preparing the molybdenum alloy plug whose finished product size is Φ54mm * 145mm (wherein the total length of the plug is 145mm, and the diameter of the sizing area is 54mm) comprises the following steps:

[0032] Step 1. Put carbon powder, titanium hydride powder, zirconium hydride powder and rare earth oxide powder in a three-dimensional mixer (purchased from Nanjing Feiyu Pharmaceutical Equipment Co., Ltd., model SYH-1200), and mix under vacuum for 60 minutes , to obtain doping powder, then place the doping powder and molybdenum powder in a horizontal mixer and mix for 120min to obtain the mixed powder raw material; the rare earth oxide powder is cerium oxide powder and yttrium oxide powder, and the mixing The quality of carbon powder in the powder raw material is 0.3% of the mass of molybdenum powder, the quality of titanium hydride powder is 1.29% of the mass of molybdenum powder, the quality of zirconium hydride powder is 0.3% of the mass of molybden...

Embodiment 2

[0049] The method for preparing the molybdenum alloy plug whose finished product size is Φ64mm * 145mm (wherein the total length of the plug is 145mm, and the diameter of the sizing area is 64mm) comprises the following steps:

[0050] Step 1. Put carbon powder, titanium hydride powder, zirconium hydride powder and rare earth oxide powder in a three-dimensional mixer (purchased from Nanjing Feiyu Pharmaceutical Equipment Co., Ltd., model SYH-1200), and mix under vacuum for 60 minutes , to obtain doping powder, then place the doping powder and molybdenum powder in a horizontal mixer and mix for 120min to obtain the mixed powder raw material; the rare earth oxide powder is cerium oxide powder and yttrium oxide powder, and the mixing The mass of carbon powder in the powder raw material is 0.3% of the mass of molybdenum powder, the mass of titanium hydride powder is 1.3% of the mass of molybdenum powder, the mass of zirconium hydride powder is 0.3% of the mass of molybdenum powder,...

Embodiment 3

[0057] The method for preparing the molybdenum alloy plug whose finished product size is Φ74mm * 165mm (wherein the total length of the plug is 165mm, and the diameter of the sizing area is 74mm) comprises the following steps:

[0058] Step 1. Put carbon powder, titanium hydride powder, zirconium hydride powder and rare earth oxide powder in a three-dimensional mixer (purchased from Nanjing Feiyu Pharmaceutical Equipment Co., Ltd., model SYH-1500), and mix under vacuum for 90 minutes , to obtain doping powder, then place the doping powder and molybdenum powder in a horizontal mixer and mix for 90min to obtain the mixed powder raw material; the rare earth oxide powder is cerium oxide powder and yttrium oxide powder, and the mixing The mass of carbon powder in the powder raw material is 0.25% of the mass of molybdenum powder, the mass of titanium hydride powder is 1.25% of the mass of molybdenum powder, the mass of zirconium hydride powder is 0.28% of the mass of molybdenum powde...

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Abstract

The invention discloses a preparation method of a composite rare earth oxide reinforced molybdenum alloy piercing mandrel. The method includes the steps: firstly, uniformly mixing carbon powder, titanium hydride powder, zirconium hydride powder and rare earth oxide powder in a three-dimensional mixer to obtain doped powder, and then uniformly mixing the doped powder and molybdenum powder to obtain mixed powder raw materials; secondly, pressing the mixed powder raw materials to form piercing mandrel blanks; thirdly, finishing the piercing mandrel blanks to remove redundant piercing mandrel blanks; fourthly, sintering the finished piercing mandrel blanks, and cooling the sintered the piercing mandrel blanks to reach indoor temperature to obtain the composite rare earth oxide reinforced molybdenum alloy piercing mandrel. Composite rare earth oxide is added based on a TZM (titanium zirconium molybdenum) alloy, and the molybdenum alloy piercing mandrel with fine high-temperature hardness and flexural toughness is prepared by the aid of technological processes such as mixing, pressing, finishing and sintering and can stably adapt to high-temperature, high-pressure, splat cooling and quick heating working environments.

Description

technical field [0001] The invention belongs to the technical field of molybdenum alloy plug preparation, and in particular relates to a method for preparing a molybdenum alloy plug strengthened by composite rare earth oxides. Background technique [0002] During the piercing process of the seamless steel pipe, the molybdenum alloy plug is in direct contact with the high-temperature steel billet. Under the action of rolling friction, the temperature of the nose of the molybdenum alloy plug is as high as 1300°C, and the entire cone area of ​​the molybdenum alloy plug bears this huge pressure. Axial pressure, radial stress and surface friction. At the same time, the molybdenum alloy plug must be forced to cool in water during the process of pipe penetration. In such a harsh working environment of high temperature, high pressure and rapid cooling and rapid heating, molybdenum alloy plugs are subjected to the combined effects of mechanical fatigue and thermal fatigue, and are pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F1/00B22F5/00
Inventor 易永鹏史振琦李博奚斌武惠军胜俞国庆葛宽余
Owner JINDUICHENG MOLYBDENUM CO LTD
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