一种防止耐热合金厚壁管晶粒异常长大的 热处理方法，属于耐热合金钢管热处理技术领 域。步骤：采用垂直立式挤压机热挤压后的荒管， 壁厚为70～120mm，400℃装炉，以加热速率60℃/ h升温至800～820℃，保温2～4小时，然后以加热 速率80℃/h升温至970～990℃，保温1～3小时， 再以加热速率100℃/h升温至1090～1120℃，保 温1～6小时，最后以加热速率100℃/h升温至 1150～1160℃，保温1～7小时，出炉后水淬至室 温。优点在于，不仅防止奥氏体晶粒异常长大，改 善厚壁管径向温度场，而且晶粒均匀、级差小，大 大改善厚壁管径向组织与性能的均匀性。

The invention relates to a heat treatment method for preventing abnormal grain growth of heat-resistant alloy thick wall pipe, belonging to the heat treatment technical field of heat-resistant alloy steel pipe. The process is as follows: using the vertical extrusion machine to extrude the raw pipe with the wall thickness of 70-120mm, charging at 400 ℃, heating at 60 ℃ / h to 800-820 ℃, holding for 2-4 hours, then heating at 80 ℃ / h to 970-990 ℃, holding for 1-3 hours, then heating at 100 ℃ / h to 1090-1120 ℃, holding for 1-6 hours, Finally, the temperature was raised to 1150-1160 ℃ at the heating rate of 100 ℃ / h for 1-7 hours, and then quenched to room temperature. The advantage is that it can not only prevent the abnormal growth of austenite grain and improve the radial temperature field of thick walled pipe, but also have uniform grain and small grade difference, which greatly improves the uniformity of radial structure and properties of thick walled pipe.