Ti35 titanium alloy resistant to nitric acid corrosion

Abstract

The invention discloses a Ti35 titanium alloy resistant to nitric acid corrosion. The Ti35 titanium alloy resistant to nitric acid corrosion is characterized by comprising the following components of, in percentage by mass, 5.5%-6.5% of tantalum, 0.07%-0.15% of oxygen and the balance titanium and inevitable impurities. According to the Ti35 titanium alloy, by controlling the mass content of tantalum to be 5.5%-6.5%, it is guaranteed that the Ti35 titanium alloy has a stable and reliable low corrosion rate while the material cost is low; and meanwhile, oxygen is adopted as interstitial atoms to be added into the titanium alloy, the mass content of the oxygen is controlled to be 0.07%-0.15%, the tensile strength of the Ti35 titanium alloy is effectively improved to 350 MPa or above, the ductility of the Ti35 titanium alloy is kept at 25% or above, and therefore the strength and plasticity of the Ti35 titanium alloy are effectively regulated and controlled, the method is simple, and industrial application is facilitated.

Description

Technical field[0001]The present invention belongs to the field of non-ferrous metal alloy materials, and more particularly to a Ti35 titanium alloy of nitrate resistant to nitrate.Background technique[0002]The lack of fuel produced by nuclear power plants re-produced nuclear fuel recycling by post-treatment, which can effectively reduce emissions and pollution of radioactive substances, and improve the utilization of uranium resources. The international general Pressenial treatment process is to use nitric acid to dissolve fuel cells, remove nuclear fission products, recover the chemical process of nuclear fuel, and key equipment such as solutions, evaporators, etc., for a long time, in a long period of time, in length Among the high temperature and concentrated nitric acid in the radiation, the service environment is extremely bad, which has highly required the mechanical properties, process performance and corrosion resistance of equipment materials.[0003]Generally, the stainless...

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Problems solved by technology

[0004] The KS50Ta (Ti-5Ta) alloy developed by Kobe Steel, Japan, enhances the corrosion resistance of industrial pure titanium by adding 4wt% to 6wt% tantalum to pure titanium. The annual average of the alloy in boiling nitric acid solution The corrosion rate is 0.1-0.2mm / a, the tensile strength is 330MPa, and the elongation is 23%. The disadvantages are that the strength and plasticity are not high, and the corrosion resistance is slightly poor.

[0005] Japan's Kobe Steel Institute Sho 61-42473 discloses a Ti-Ta-Si alloy with excellent nitric acid corrosion resistance, which is added by adding 1% to 6% of tantalum and 0.01% to 0.5% of Silicon, forming a ternary corrosion-resistant titanium alloy, inhibits the corrosion of Ti-Ta-based alloys by adding a small amount of silicon, but the inhibitory effect is limited, and the addition of silicon will affect the plasticity and processability of Ti-Ta-based materials. adversely affect

[0006] The invention patent with the patent number ZL95101399.8 discloses a 550MPa grade nitric acid corrosion-resistant titanium alloy, which is added by adding 3% to 7% of tantalum, 0.1% to 0.7% of aluminum and 0.2% to 0.6% of titanium to titanium. molybdenum, forming a quaternary corrosion-resistant titanium alloy, its strength is increased to 550MPa, the corrosion rate reaches 0.1mm / a, but the elongation is only 23%, and the plasticity of the material needs to be further improved

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