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Medium-strength nitric acid corrosion-resistant titanium alloy

A titanium alloy and strength technology, applied in the field of titanium alloys, can solve the problem of not meeting the strength requirements of transmission components

Active Publication Date: 2020-10-27
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The patent with publication number CN 1117085A mentions a 550MPa grade nitric acid corrosion-resistant titanium alloy, specifically Ti-55C alloy, which is based on the KS50Ta alloy with a small amount of Al and Mo alloying elements added to improve the strength of the alloy. 100MPa~200MPa, its tensile strength can reach up to 670MPa, yield strength is 451MPa, but its strength still does not meet the strength requirements of transmission parts (tensile strength is not less than 650MPa, yield strength is not less than 500MPa)
Although the plate strength of Ti-55C alloy can reach up to 670MPa, its yield strength is only 451MPa, which does not meet the strength requirements of transmission parts

Method used

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  • Medium-strength nitric acid corrosion-resistant titanium alloy

Examples

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Comparison scheme
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Embodiment 1

[0021] The medium-strength nitric acid corrosion-resistant titanium alloy of this embodiment is composed of the following components in mass percentage: Ta5.5%, Al 0.7%, Zr 1.0%, Mo 0.8%, Nb 1.1%, and the balance is Ti and unavoidable impurities.

[0022] This embodiment includes the following steps:

[0023] Step 1, mixing Ti-50% Ta master alloy, Ti-30% Mo master alloy, Al-70% Nb master alloy, aluminum beans, sponge zirconium and sponge titanium, and then pressing to obtain an electrode;

[0024] Step 2, melting the electrode obtained in Step 1 three times in a vacuum consumable electric arc furnace to obtain an ingot;

[0025] Step 3. Carrying out billet forging three times at 1150° C., 1050° C. and 950° C. respectively on the ingot obtained in step 2 to obtain the forged ingot;

[0026] Step 4. Convert the forged ingot obtained in Step 3 into a rolled billet at 850° C., and then perform finished rolling at 870° C. to obtain a medium-strength nitric acid corrosion-resistant...

Embodiment 2

[0052] The medium-strength nitric acid corrosion-resistant titanium alloy in this embodiment is composed of the following components in mass percentage: Ta 5.0%, Al 0.9%, Zr 2.0%, Mo 1.0%, Nb 0.7%, and the balance is Ti and unavoidable impurities.

[0053] This embodiment includes the following steps:

[0054] Step 1, mixing Ti-50% Ta master alloy, Ti-30% Mo master alloy, Al-70% Nb master alloy, aluminum beans, sponge zirconium and sponge titanium, and then pressing to obtain an electrode;

[0055] Step 2, melting the electrode obtained in Step 1 three times in a vacuum consumable electric arc furnace to obtain an ingot;

[0056] Step 3. Carrying out billet forging three times at 1150° C., 1050° C. and 950° C. respectively on the ingot obtained in step 2 to obtain the forged ingot;

[0057] Step 4. The forged ingot obtained in Step 3 is converted into a rolled billet at 900°C, and then rolled at 830°C to obtain a medium-strength nitric acid corrosion-resistant titanium alloy ...

Embodiment 3

[0061] The medium-strength nitric acid corrosion-resistant titanium alloy in this embodiment is composed of the following components in mass percentage: Ta 6.0%, Al 1.1%, Zr 1.5%, Mo 0.6%, Nb 2.0%, and the balance is Ti and unavoidable impurities.

[0062] This embodiment includes the following steps:

[0063] Step 1, mixing Ti-50% Ta master alloy, Ti-30% Mo master alloy, Al-70% Nb master alloy, aluminum beans, sponge zirconium and sponge titanium, and then pressing to obtain an electrode;

[0064] Step 2, melting the electrode obtained in Step 1 three times in a vacuum consumable electric arc furnace to obtain an ingot;

[0065] Step 3. Carrying out billet forging three times at 1150° C., 1050° C. and 950° C. respectively on the ingot obtained in step 2 to obtain the forged ingot;

[0066] Step 4. Convert the forged ingot obtained in Step 3 into a rolled billet at 870° C., and then perform finished rolling at 850° C. to obtain a medium-strength nitric acid corrosion-resistan...

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Abstract

The invention discloses a medium-strength nitric acid corrosion-resistant titanium alloy. The titanium alloy is composed of the following components of, in percentage by mass, 5.0-7.0% of Ta, 0.7-1.5%of Al, 0.2-2% of Zr, 0.6-1.5% of Mo, 0.2-2% of Nb, and the balance Ti and inevitable impurities. The tensile strength of the annealed titanium alloy subjected to annealing treatment is 670-750 MPa, the yield strength of the annealed titanium alloy is 520-650 MPa, and the corrosion rate of the annealed titanium alloy in a boiling nitric acid solution with the concentration of 6 mol / L is not higherthan 0.08 mm / a. According to the medium-strength nitric acid corrosion-resistant titanium alloy, through adjusting the content of each element in the titanium alloy, the medium-strength nitric acid corrosion-resistant titanium alloy has excellent tensile strength, yield strength, corrosion resistance and impact toughness, also has excellent cold and hot processing properties, can be prepared intovarious processed products, and is suitable for manufacturing related equipment in the fields of nuclear industry and chemical industry.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, in particular to a medium-strength nitric acid corrosion-resistant titanium alloy. Background technique [0002] Titanium and titanium alloys have a series of performance advantages such as high specific strength, non-magnetic, low thermal expansion coefficient, and corrosion resistance. As an important metal structure material, they are not only used in aerospace and ocean engineering, but also in the nuclear industry and chemical industry. widely used in the field. Among them, in the strong oxidizing nitric acid solution, titanium and titanium alloys have good corrosion resistance, especially titanium alloys containing a certain amount of tantalum, such as KS50Ta alloy developed by Kobe Steel in Japan, Ti35 and Ti35 developed in my country. -55C alloy, its nitric acid corrosion resistance is equivalent to nuclear ultra-low carbon stainless steel, but the strength of alloys such as KS50T...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 尹雁飞杨海瑛赵圣泽罗媛媛郭荻子
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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