研究采用斜轧穿孔及冷扩成形方法制备直径大于130 mm的大口径Ti-75无缝管材的可行性。分别测试穿孔管坯和冷扩后管材的金相组织、力学性能及沿管材轴向方向的裂纹情况。结果表明:采用斜轧穿孔方式可以制备Ti-75合金大口径无缝管材且拥有较好的塑性;在室温下,进行冷扩,在扩径率小于15%时,可得到抗拉强度为780 MPa,屈服强度为685 MPa,伸长率为13.5%,断面收缩率为55%的管坯,且不出现扩裂等情况。 The feasibility of preparing large diameter Ti-75 seamless pipe with diameter greater than 130 mm by using the method of cross-piercing and cold expansion forming was studied. The microstructure, mechanical properties and crack along the axial direction of the pipe were tested respectively. The results show that the Ti-75 alloy large-diameter seamless pipe can be prepared by oblique-piercing method and has good ductility. Cold expansion at room temperature, tensile strength of 780 MPa, yield strength of 685 MPa, elongation of 13.5%, reduction of area of ​​55% of the tube, and does not appear to crack and so on.