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A 1000mpa grade nitric acid corrosion resistant titanium alloy

A titanium alloy and nitric acid technology, which is applied in the field of 1000MPa grade nitric acid corrosion resistant titanium alloy, can solve the problems of not being able to meet the requirements of boiling nitric acid resistance and mechanical properties, and achieve excellent nitric acid corrosion resistance, excellent cold and hot processability, and easy The effect of preparation

Active Publication Date: 2022-06-14
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some working conditions of post-processing projects, such as toothed runners, jet pumps, valve bodies and other key components, in addition to nitric acid corrosion resistance, their strength needs to reach more than 900 MPa. The existing post-processing corrosion-resistant titanium alloy The mechanical properties do not meet the requirements, and the aerospace β-type high-strength titanium alloy developed based on β-element strengthening has good mechanical properties, but it cannot meet the severe working conditions of boiling nitric acid resistance in the post-processing industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The 1000MPa grade nitric acid corrosion resistant titanium alloy of the present embodiment, consisting of the following mass percentage components: Ta5.0%, V 5.0%, Cr 8.0%, Al 0.9% residual amount of Ti and unavoidable impurities.

[0023] The present embodiment includes the following steps:

[0024] Step 1: Mix sponge titanium, Ti-Ta intermediate alloy, Al-V intermediate alloy and electrolytic Cr powder and press to obtain an electrode;

[0025] Step 2: The electrode obtained in step 1 is smelted three times by vacuum self-consumption arc to obtain alloy ingots;

[0026] Step 3: Peel, cut the riser and cut the tail end in turn the alloy ingot obtained in step 2, and then carry out blank forging, multi-fire intermediate forging and finished product forging in turn on the forging machine to obtain nitric acid corrosion-resistant titanium alloy; The temperature of the blank forging is 1050 ° C, the temperature of the multi-fire intermediate forging is 900 ° C, the temperature...

Embodiment 2

[0030] The 1000MPa grade nitric acid corrosion resistant titanium alloy of the present embodiment, consisting of the following mass percentage components: Ta 6.0%, V 6.0%, Cr 7.0%, Al 1.0% residual amount of Ti and unavoidable impurities.

[0031] The present embodiment includes the following steps:

[0032] Step 1: Mix sponge titanium, Ti-Ta intermediate alloy, Al-V intermediate alloy and electrolytic Cr powder and press to obtain an electrode;

[0033] Step 2: The electrode obtained in step 1 is smelted three times by vacuum self-consumption arc to obtain alloy ingots;

[0034] Step 3: Peel, cut the riser and cut the tail end in turn the alloy ingot obtained in step 2, and then carry out blank forging, multi-fire intermediate forging and finished product forging in turn on the forging machine to obtain nitric acid corrosion-resistant titanium alloy; The temperature of the blank forging is 1150 ° C, the temperature of the multi-fire intermediate forging is 980 ° C, the temperature...

Embodiment 3

[0038] The 1000MPa grade nitric acid corrosion resistant titanium alloy of the present embodiment consists of the following mass percentage components: Ta4.0%, V 4.0%, Cr 9.0%, Al 0.7% residual amount of Ti and unavoidable impurities.

[0039] The present embodiment includes the following steps:

[0040] Step 1: Mix sponge titanium, Ti-Ta intermediate alloy, Al-V intermediate alloy and electrolytic Cr powder and press to obtain an electrode;

[0041] Step 2: The electrode obtained in step 1 is smelted three times by vacuum self-consumption arc to obtain alloy ingots;

[0042] Step 3: Peel, cut the riser and cut the tail end in turn the alloy ingot obtained in step 2, and then carry out blank forging, multi-fire intermediate forging and finished product forging in turn on the forging machine to obtain nitric acid corrosion-resistant titanium alloy; The temperature of the blank forging is 1100 ° C, the temperature of the multi-fire intermediate forging is 950 ° C, the temperature of...

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Abstract

The invention discloses a 1000MPa nitric acid corrosion-resistant titanium alloy, which is composed of the following components in mass percentage: Ta 4%~6%, V 4%~6%, Cr 7%~9%, Al not more than 1.5% , the balance is Ti and unavoidable impurities; the tensile strength of titanium alloy after solution aging treatment is not less than 1000MPa, the yield strength is not less than 900MPa, and the corrosion rate in boiling nitric acid solution with a concentration of 6mol / L is not high At 0.1mm / a. The new titanium alloy designed by optimizing the β-stabilizing elements and their proportions in the present invention has simple components, is not prone to segregation, has a uniform and stable structure, has excellent cold and hot workability, and is easy to prepare. Compared with existing titanium alloys, it is less resistant to The corrosion performance of nitric acid is improved, and the tensile strength and yield strength are greatly improved at the same time. It is used in nuclear power and chemical engineering equipment, and has a good application prospect.

Description

Technical field [0001] The present invention belongs to the field of nitric acid corrosion resistant titanium alloy technology, specifically relates to a 1000MPa grade nitric acid corrosion resistant titanium alloy. Background [0002] In the selection of materials for the structural parts of nuclear spent fuel reprocessing equipment, nitric acid-resistant stainless steel was used in the early days, but with the deepening of nuclear fuel consumption, these materials have phenomena such as intergranular corrosion and corrosion of the root of the welded joint, which is difficult to meet the requirements of long-term use. With the increase of the concentration of U235 in the power reactor fuel and the deepening of the combustion consumption, the content of transuranic elements and fission products produced in the spent fuel has increased, which in turn enhances the corrosiveness of the nitric acid solution. Therefore, the use of new materials with stronger corrosion resistance to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22F1/18C22C1/03
CPCC22C14/00C22F1/183C22C1/03
Inventor 赵恒章吴金平吴俊宇杨帆赵彬潘晓龙张于胜
Owner 西安稀有金属材料研究院有限公司
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