本发明公开了一种含极低量合金化元素的高温抗氧化钛合金，属于钛合金材料领域。钛合金化学成分以质量％计算，含有钨(W)、铌(Nb)、钽(Ta)和硅(Si)元素中的至少2种元素，其中，单个W、Nb和Ta元素的含量不超过0.8％，Si元素的含量不超过0.6％，添加的合金元素总量不超过1％并且不低于0.2％，剩余为钛(Ti)。所述钛合金的室温拉伸力学性能为：屈服强度150～500MPa，抗拉强度200～600MPa，延伸率15～45％。所述钛合金在600‑900℃空气中具有优异的抗氧化性能，在650～850℃空气中保温100小时，氧化速率不超过工业纯钛TA1的30～80％，最低氧化速率可达工业纯钛TA1的9.4％～40％。 

 The invention discloses a high-temperature oxidation-resistant titanium alloy containing extremely low alloying elements, and belongs to the field of titanium alloy materials. The titanium alloy comprises the chemical components of, by mass, at least two elements of tungsten (W), niobium (Nb), tantalum (Ta) and silicon (Si), wherein the content of each of the W, Nb and Ta elements is not more than0.8%, the content of the Si element is not more than 0.6%, the total amount of the added alloy elements is not more than 1% and not lower than 0.2%, and the balance titanium (Ti); and the room-temperature tensile mechanical property of the titanium alloy is that the yield strength is 150-500 Mpa, the tensile strength is 200-600 Mpa, and the elongation rate is 15-45%. The titanium alloy has excellent oxidation resistance in the air with the temperature of 600-900 DEG C, heat preservation is carried out on the titanium alloy in the air with the temperature of 650-850 DEG C for 100 hours, the oxidation rate does not exceed 30-80% of industrial pure titanium TA1, and the lowest oxidation rate can reach 9.4-40% of the oxidation rate of the industrial pure titanium TA1.