Corrosion resistant titanium niobium alloy plate preparation method, in particular a titanium alloy plate containing Nb0.1 ~ 4.9% and its manufacturing method: the specific process route is: Titanium sponge + pure niobium → batching → electrode preparation → double vacuum consumable arc furnace melting → peeling → forging → Machining → Coating → hot rolling → alkali pickling → Heat treatment → grinding → cold rolling → pickling → Heat treatment → Finishing → Finished product.
Titanium alloy plates containing Nb0.1 ~ 4.9% (specifically 0.5, 1.0, 2.5 and 4.5%), according to the weight percentage of alloy composition is: Nb2.5%, the control C≤0.05%, N≤0.03%, H≤0.012%, O≤0.10%, Fe≤0.15%, the single impurity of other elements ≤0.10%, the sum of other elemental impurities ≤0.40%, Ti is the residual; According to the above technical plan, the alloy raw materials of the above components are processed into slabs and semi-finished slabs, and the impurity elements are controlled C≤0.05%, N≤0.03%, H≤0.012%, O≤0.10%, Fe≤0.15%, and then the finished sheets are prepared by hot rolling, repeated cold rolling and heat treatment. Cold-rolled sheet specifications range thickness 0.4 ~ 1.0× width 300 ~ 1500×Lmm;
The detailed process is described as follows:
(1) Ingot preparation: Titanium sponge and pure niobium are used to mix and press the electrode block according to the mass ratio, and the electrode block is combined to prepare the primary electrode, and then the vacuum consumable arc melting is carried out twice to prepare the Φ300 ~ 900×Lmm ingot;
(2) Forging preparation of slab: A fast forging machine was used to open the ingot and forge the slab. The surface of the ingot was coated before the slab was heated. The forging temperature was 900 ~ 1100℃, the heat preservation was 2 ~ 5 hours, the forging ratio was 2 ~ 10, the final forging temperature was ≥700℃, the slab forging temperature was 750 ~ 1000℃, the heat preservation was 1 ~ 3 hours, the forging ratio was 2 ~ 6, the final forging temperature was ≥650℃. The thickness of the slab is 30 ~ 200× 300 ~ 1500×Lmm, and the forging fire time of the slab is 1 ~ 4 times (if the first fire time is completed, the forging process and the opening process of the slab are the same);
(3) Slab hot rolling: the opening or one fire heating temperature of 800 ~ 900℃, insulation 1 ~ 3 hours, the total processing rate of 70 ~ 90%, the final rolling temperature ≥650℃, 2 ~ 4 fire hot rolling heating temperature of 750 ~ 880℃, insulation 1 ~ 2 hours, the total processing rate of 60 ~ 80% per fire, the final forging temperature ≥600℃;
(4) Surface treatment: alkaline washing (ratio of 85 ~ 95%NaOH+15 ~ 5NaNO3, weight percentage) and pickling (ratio of HF: HNO3: H2O=5 ~ 10% : 30 ~ 40% : Residual, volume ratio) remove surface oxide, wash clean, and then surface grinding to ensure that the surface has no visible surface defects;
