一种海洋用两相钛合金无缝管坯的斜轧穿孔方法，通过将头尾定心孔的组合设计、抗氧化涂层的使用、感应加热与电阻炉保温相结合的加热工序，能够利用现有设备高效稳定地生产两相钛合金无缝管坯，能够穿制不同规格、力学性能优异的管坯，从而有效降了低生产成本，本发明能够生产外径为60～100mm，壁厚为6～10mm的小口径薄壁钛管坯，其屈服强度≥850MPa，抗拉强度≥950MPa，伸长率≥13％，断面收缩率≥34％，冲击功≥40J，得到的管坯为后续轧制工序提供优质的原材料，有利于钛合金无缝管在海洋工程领域的大规模应用，具有广阔的应用前景。

The invention discloses a cross piercing method of two-phase titanium alloy seamless tube blanks for oceans. Through the steps of combined design of head and tail centering holes, use of an oxidation-resistance coating, and heating working procedures of combining induction heating and resistance furnace heat preservation, existing equipment can be utilized for efficiently and stably producing thetwo-phase titanium alloy seamless tube blanks, the tube blanks with different specifications and excellent mechanical performance can be manufactured, and thus the production cost is effectively lowered. According to the cross piercing method, the small-caliber thin-wall titanium tube blanks can be manufactured, wherein for each tube blank, the external diameter is 60-100 mm, the wall thickness is6-10 mm, the yield strength is larger than or equal to 850 MPa, the tension strength is larger than or equal to 950 MPa, the elongation is larger than or equal to 13%, the percentage reduction of area is larger than or equal to 34%, and the impact energy is larger than or equal to 40 J. The obtained tube blanks provide high-quality raw materials for subsequent rolling working procedures, large-scale application of titanium alloy seamless tubes in the field of ocean engineering is facilitated, and the cross piercing method has a wide application prospect.