现代交通与冶金材料

针对UNS N06625镍基合金无缝钢管制造中存在的热加工塑性差、冷轧变形抗力大及组织调控等问题，提出了一种涵冷轧、中间热处理及最终热处理的成套高效制备工艺。通过利用该合金的再结晶长大对时间的不敏感特性，优化了冷轧及短时中间热处理（1150℃/2.5 min）工艺，冷轧硬度与晶粒度可控，残余应力显著降低；最终热处理采用1150～1180℃的保温工艺，晶间腐蚀速率降低至0.5 mm/y以下，并同时保持了优异的综合力学性能（平均屈服强度达到350 MPa、抗拉强度820 MPa、延伸率69%）。经成品管检验，无缝钢管表面及内部质量、尺寸精度、及各项综合性能优异，该成套工艺稳定可靠，实现了UNS N06625镍基合金无缝管材的高效高质量生产制造。

This study addresses the manufacturing challenges of UNS N06625 nickel-based alloy seamless tubes, e.g., poor hot workability, high resistance of cold-rolling deformation, and microstructure controlling. An integrated high-efficiency preparation process is proposed. By utilizing the timeinsensitive characteristics of grain growing during recrystallization, the cold rolling deformation process is optimized with a short-time intermediate heat treatment(1150 °C/2.5 min). This approach achieves controllable hardness and grain size during cold-rolling, and significantly reduces residual stress. The final heat treatment of 1150～1180 ° C reduces the intergranular corrosion rate down to lower than 0.5 mm/y, while maintaining excellent mechanical properties(average yield strength: 350 MPa, tensile strength: 820 MPa, elongation: 69%). After inspections, seamless tube products demonstrate excellent surface and internal quality, dimensional accuracy, and comprehensive performances. The serial preparation process exhibits high stability and reliability, and a high-efficiency and high-quality manufacturing for UNS N06625 nickel-based alloy seamless tubes is achieved.