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Titanium alloy valve rod preparation method of plug valve

A titanium alloy, plug valve technology, applied in the direction of plugs, valve devices, mechanical equipment, etc. including cutting devices, can solve the problems of cracks, low material utilization, slow valve processing speed, etc. Impact reduction and size reduction effects

Inactive Publication Date: 2013-03-20
ANHUI CHUNHUI INSTR CABLE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the valve stem of powder metallurgy plug valve, the processing speed of ordinary high-speed steel or stainless steel material is slower, and the material utilization rate is not high. For mass production, a small amount of fine grinding of the powder metallurgy valve stem is required before assembly and use, and cracks often appear during use

Method used

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Embodiment Construction

[0015] A method for preparing a titanium alloy valve stem of a plug valve, comprising the following steps:

[0016] a. Select β-titanium alloy containing titanium molybdenum and molybdenum content of 6.5-18% as the casting object, melt the alloy at a temperature higher than 1550 ° C, and precision cast the molten alloy into the valve stem blank, at the highest level equal to titanium molybdenum alloy Hot isostatic pressing at the β-transition temperature and the lowest temperature 100°C lower than the β-transition temperature, solution annealing at a temperature of 700-900°C, and then heating to 650-760°C, holding for 3-5 hours, furnace Cool to 300°C, hold for 4 hours, then heat to 650-760°C, hold for 17 hours, cool to 450°C at 50°C / hour, then cool to 140°C at 20°C / hour;

[0017] b. Quenching treatment: Send the plug valve stem into a heat treatment furnace to heat to 850-890°C, and keep it warm for 2-3 hours; then, cool it with quenching oil;

[0018] c. Tempering treatment:...

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Abstract

The invention discloses a titanium alloy valve rod preparation method of a plug valve. The process comprises a first step of choosing beta titanium alloy with titanium and the molybdenum as a cast object, wherein the content of molybdenum is from 6.5% to 18%. The beta alloy is fused under the temperature higher than 1550 DEG C, and the fused alloy is cast precisely into a valve rod blank piece. Hot isostatic pressure can be carried out when the highest temperature is equal to beta transformation temperature of the titanium and molybdenum alloy and the lowest temperature is 100 DEG C lower than beta transformation temperature. Solution annealing is carried out under the temperature from 700 DEG C to 900 DEG C. The alloy is heated to 650-760 DEG C. The process of heat preservation is carried out for 3-5 hours. When a furnace is cooled to 300 DEG C, the process of the heat preservation is carried out for 4 hours, and then the alloy is heated to 650-760 DEG C. The process of the heat preservation is carried out for 17 hours. The alloy is cooled to 450 DEG C at a speed of 50 DEG C per hour and then at a speed of 20 DEG C per hour, and the beta alloy is cooled to 140 DEG C. Heat treatment and subzero treatment have high production continuity. Material utilization rate is high. The beta alloy is suitable for mass production, and cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing a plug valve, in particular to a method for preparing a titanium alloy valve stem of the plug valve. Background technique [0002] The plug valve is a closing member or a plunger-shaped rotary valve. By rotating 90 degrees, the channel port on the valve plug is the same as or separated from the channel port on the valve body to realize opening or closing. [0003] At present, in the production of plug valve industry, domestic plug valves are made of ordinary high-speed steel materials, or valve stems processed by stainless steel materials. Compared with the valve stem of powder metallurgy plug valve, the processing speed of ordinary high-speed steel or stainless steel material is slower, and the material utilization rate is not high. For mass production, powder metallurgy valve stems need to be finely ground in a small amount before assembly and use, and cracks often appear during use. Contents of the ...

Claims

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Application Information

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IPC IPC(8): C22F1/18F16K5/08
Inventor 沈必亮
Owner ANHUI CHUNHUI INSTR CABLE GROUP
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