The corrosion resistant titanium niobium alloy and the method of preparing sheet and tube from it are characterized by the following composition according to the weight percentage: Nb 0.1 ~ 4.9%, C≤ 0.08%, N≤ 0.03%, H≤ 0.012%, O≤ 0.12%, Fe≤ 0.1%, and the allowance is Ti. The invention discloses the Ti - (0.8 ~ 6%) of niobium alloy tube with metallic titanium as substrate, add a small amount of niobium metal, solid solution strengthening way increase mechanical properties of the metal niobium, the shear strength and tensile strength are higher than that of pure titanium, tensile strength increased by 10 to 20%, and maintain good plasticity and forming performance, excellent cold resistance; By adding niobium, the corrosion resistance of titanium is further improved and the corrosion resistance range of titanium is expanded. It is a good corrosion resistant material easy to form.
A Ti-45Nb alloy, which inherits the properties of Ti and Nb, has a lower specific gravity and cost ratio than pure niobium, and an corrosion resistance comparable to that of pure niobium, and an order of magnitude greater than that of pure titanium. But the price of this alloy and share a lot higher than pure titanium or, only about seven times the raw material cost increases, so a small amount can only be used in special environment, such as hydrometallurgy, board system, such as low pressure oxidation of some of the working conditions of parts, and implant in areas such as aerospace rivet and the human body, seriously affecting the promotion of the alloy in use. Now has produced the Ti-45Nb alloy wire with a diameter of 2.5 ~ 5mm, which has been used for testing and evaluation of aviation fastener materials, but has not been applied in other fields.
Ingot preparation: titanium sponge and pure niobium were used for batching and pressing the electrode block according to the ratio of claim 1. The electrode block was welded together to prepare an electrode, and then the ingot was prepared by vacuum consumable arc melting twice. Slab forging preparation: the fast forging machine to breakdown and slab ingot casting forging, sufficiently before heating of the ingot surface coating processing, forging breakdown for 900 ~ 1100 ° C temperature, heat preservation of 2 ~ 5 hours, forging ratio 2 ~ 10, finish forging temperature 700 V, the slab forging temperature is 750 ~ 1000 V, insulation I ~ 3 hours, forging ratio 2 ~ 6.
