The invention relates to a preparation method of a TC4
titanium alloy cold-rolled coiled strip, and belongs to the technical field of
titanium alloy production. Comprising the steps that S1, raw materials prepared from chemical components including 5%-7% of Al, 3%-5% of V, smaller than or equal to 0.25% of Fe, smaller than or equal to 0.08% of C, smaller than or equal to 0.01% of H, smaller than or equal to 0.2% of O, smaller than or equal to 0.05% of N and the balance Ti and inevitable impurities are smelted and then subjected to
forging cogging, plate blank
coating and hot
continuous rolling to form a hot-rolled coil, and a cold-rolled
raw material is obtained after acid
pickling; and S2, the cold-rolled raw materials are rolled twice, 4-7 passes are rolled each time, and a finished product is obtained after
vacuum annealing. According to the method, a multi-pass rolling and annealing process is combined, and the TC4
titanium alloy cold-rolled coil strip which is sufficient in microcosmic
grain crushing, good in structure uniformity, excellent in surface quality and capable of meeting the
national standard requirement in product performance is effectively obtained. The problems of
plasticity reduction, non-uniform deformation, edge
cracking and surface cracks caused by direct cold rolling of the TC4
titanium alloy in the prior art are solved.