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Extrusion method for molybdenum alloy seamless pipe

An extrusion method and seamless pipe technology, applied in the field of extrusion of molybdenum alloy seamless pipes

Active Publication Date: 2013-03-20
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the production of Mo alloy pipes with an outer diameter ≥ 150mm by extrusion, there is no domestic production case

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0034] Domestic companies require Mo tubes:

[0035] Material: Mo (Mo content≥99.95%, C content≤0.01%, N content, O content≤0.007%, Fe content, Ni content≤0.005%, Si content≤0.010%);

[0036] Specification: Φ172×26mm

[0037] Length: 3.2m

[0038] Density before extrusion: 9.0 g / cm 3

[0039] skills requirement:

[0040] Density reaches 10g / cm after extrusion 3 above;

[0041] Outer diameter tolerance: ±2.0mm;

[0042] Wall thickness tolerance: ±2.2mm;

[0043] The surface has no defects visible to the naked eye.

[0044] The embodiment of the extrusion method of this molybdenum alloy seamless pipe comprises the following steps in sequence:

[0045] Ⅰ Billet preparation

[0046] Using Φ277mm powder metallurgy billet, central through hole diameter: Φ60mm, length 800mm;

[0047] Ⅱ heating process

[0048] 5:00 A tube billet is heated in a ring furnace, and the temperature at the furnace entrance is 600±20°C;

[0049] Target temperature: 850±10°C; heating time: 260...

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Abstract

The invention relates to an extrusion method for a molybdenum alloy seamless pipe. The extrusion method comprises the steps of I, preparing a billet, wherein a powdered metallurgical billet meets the requirements that the aperture of a central through hole is 60 + / - 5 mm, and the length is 500 to 1,500 mm; II, heating, wherein the temperature of a furnace inlet is 600 + / - 20 DEG C, the temperature of an annular furnace is 850 + / - 10 DEG C; III, performing one-time induction heating, wherein the induction heating temperature is 1,300+ / - 10 DEG C, the soaking time is 1 to 3 min, and the total time is controlled at 5 to 7 min; IV, chamfering, wherein glass powder enters a chamfering machine after being lubricated; and chamfering is completed by a chamfering cone; V, performing secondary induction heating, wherein the target temperature is 1,300 + / - 10 DEG C; and VI, lubricating an extrusion pipe and then enabling the extrusion pipe to enter an extrusion machine, wherein the extrusion speed is 100 to 120 m / s, the extrusion ratio is less than 6, and the section contraction rate is lower than 83.3 percent. The density of the molybdenum alloy seamless pipe prepared by the extrusion method is more than 10 g / cm<3>.

Description

technical field [0001] The invention relates to an extrusion method of a molybdenum alloy seamless pipe. Background technique [0002] Mo alloy tubes are widely used in ion sputtering, but the production of Mo alloy tubes as targets has always been a major bottleneck restricting this technology. [0003] The melting point of Mo alloy is as high as 2630°C, and it has high resistance to thermal deformation at high temperature, so it is difficult to form by thermal processing. The usual thermal processing temperature is above 1300°C. At present, domestic users mainly use imported foreign products, especially for Mo alloy tubes with an outer diameter of ≥150mm. There is no pressure processing molding process in the country, and it is mainly completed by powder metallurgy. The density of powder metallurgy cannot meet the requirements for target use. For the production of Mo alloy pipes with an outer diameter of ≥150mm by extrusion, there is no domestic production case. Content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02B21C29/00
Inventor 康喜唐聂飞张丙静拓雷锋梁祥祥李鹏程逸明庞瑞福武国玉侯楠
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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