本发明公开了一种抗拉强度>400MPa的钛合金无缝管坯的制造方法，其壁厚均匀、组织均匀且无裂纹。一种抗拉强度>400MPa的钛合金无缝管坯的制造方法，包括如下步骤：A、锻造制得钛合金棒材；B、在步骤A制得的钛合金棒材中开孔制得钛合金无缝管坯；其中，步骤B中，通过电火花在所述钛合金棒上穿孔形成沿轴向贯通所述钛合金棒材的穿丝孔，在所述穿丝孔中穿入通电的电极丝，沿设定路径移动电极丝或转动钛合金棒材使二者相对运动而在钛合金棒材中切割出一个圆柱体，切割后的钛合金棒材即形成空心管状的钛合金无缝管坯，所述设定路径为圆心位于钛合金棒材轴心线上的圆且该圆所处平面与钛合金棒材的轴心线相互垂直。

The invention discloses a manufacturing method of a titanium alloy seamless tube blank with tensile strength being 400 MPa. The titanium alloy seamless tube blank is uniform in wall thickness, uniformin structure and free of cracks. The manufacturing method of the titanium alloy seamless tube blank with tensile strength being 400 MPa includes the following steps that A, a titanium alloy bar is prepared by forging; B, a hole is formed in the titanium alloy bar prepared in the step A, and the titanium alloy seamless tube blank is prepared. In the step B, the titanium alloy bar is punched through electric sparks, a wire penetrating hole penetrating through the titanium alloy bar in the axial direction is formed, a powered-on electrode wire penetrates into the wire penetrating hole, the electrode wire is moved or the titanium alloy bar is rotated along a set path, the electrode wire and the titanium alloy bar move relatively so that a cylinder can be cut in the titanium alloy bar, the hollow-tube-shaped titanium alloy seamless tube blank is formed by the cut titanium alloy bar, the set path is a circle with the center of the circle being located on the axial line of the titanium alloybar, and the plane where the circle is located is perpendicular to the axial line of the titanium alloy bar.