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%, the allowance is Ti. The invention discloses the Ti - (0.8 ~ 6%) of niobium alloy pipe 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.
In order to improve the corrosion resistance of titanium, and maintain good comprehensive performance, a Ti-45Nb alloy, inherited the properties of Ti and Nb, specific gravity and price ratio of pure niobium is lower, corrosion resistance and pure niobium is comparable, compared with pure titanium corrosion resistance increased by an order of magnitude. 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.
Although a small amount of niobium is added on the basis of titanium, the titanium-(0.8 ~ 6%) niobium alloy pipe prepared by the method of the invention can improve the corrosion resistance, thermal conductivity and strength of titanium, without reducing the plasticity of titanium, still maintain good cold forming performance, and does not increase the volume cost of titanium too much. Therefore, the alloy pipe can be used as a choice of higher cost performance than pure titanium pipe, and can be applied in a wider range of fields.
The strength of Ti- (O. I ~ 6%) Nb alloy plate prepared by Ming method is much higher than that of titanium plate, but the plasticity is similar. If calculated according to the same pressure conditions, the plate prepared by this alloy can be thinner than titanium plate, which will further reduce the cost and improve the efficiency of heat exchanger plate. Therefore, it can be said that the alloy plate is a new type of high cost performance corrosion resistant heat exchanger plate with great development potential. A corrosion-resistant titanium niobium alloy consisting, by weight, of O. I ~ 4.9% Nb, C ^ O. 08%, N ^ O. 03%, H ^ O. 012%, O ^ O. 12%, Fe ^ O. 1%, with a allowance of Ti.
The specific process route is as follows: titanium sponge + pure niobium, one batching, one electrode preparation, one or two vacuum consumable arc furnace melting, one peeling, one forging, one machining, one coating, one hot rolling, one alkali pickling, one heat treatment, one repair grinding, one cold rolling, one pickling, one heat treatment, one finishing and one finished product.
