The invention provides a low-elastic-modulus beta type titanium alloy for dental filling. The low-elastic-modulus beta type titanium alloy is characterized by being prepared from alloy components according to the weight percent: 23 to 24 percent of Mo, 12 to 13 percent of Nb, 2.5 to 2.8 percent of Zr, 2.1 to 2.2 percent of Al, 1.1 to 1.7 percent of Cr, 0.5 to 0.6 percent of Ag, 0.2 to 0.3 percentof Fe, 0.4 to 0.7 percent of Ta, 0.15 to 0.2 percent of Cu, 0.3 to 0.45 percent of Hf, 0.2 to 0.4 percent of Sn, 0.05 to 0.08 percent of Er, less than or equal to 0.05 percent of O, less than or equalto 0.01 percent of H, less than or equal to 0.02 percent of C, less than or equal to 0.01 percent of N and the balance of Ti and unavoidable impurities; the beta type titanium alloy formed by heat treatment has the average crystallization grain diameter of 20 to 40mu m, the yield strength of 900 to 1000MPa, the tensile strength of 1020 to 1150MPa, the elongation percentage of 15 to 17 percent, the Young's modulus of 40 to 60GPa, the primary alpha-phase volume percent of 22 to 25 percent, the size of 2 to 3 microns and the secondary alpha-phase volume percent of 22 to 25 percent.

一种低弹性模量补牙用β型钛合金，其特征在于所述合金成分按照重量百分比分别为：Mo：23‑24、Nb：12‑13、Zr：2.5‑2.8、Al：2.1‑2.2、Cr：1.1‑1.7、Ag：0.5‑0.6、Fe：0.2‑0.3、Ta：0.4‑0.7、Cu 0.15‑0.2、Hf：0.3～0.45、Sn：0.2～0.4、Er：0.05‑0.08、O≤0.05、H≤0.01、C≤0.02、N≤0.01％、剩余部分为Ti及不可避免的杂质构成，经热处理后形成的β型钛合金中平均结晶粒径为20‑40μm；屈服强度900‑1000MPa，抗拉强度1020‑1150MPa，延伸率15‑17％，杨氏模量40‑60GPa，初生α相体积分数为22‑25％，尺寸为2‑3微米，次生α相体积分数为20‑25％。