本发明针对耐事故核燃料元件用现有FeCrAl不锈钢包壳辐照脆化严重、加工难的特点，公开了一种FeCrAl不锈钢包壳管及其制备方法，包括按质量百分比计的如下各组分：Cr：8～14％，Al：3～6％，Mo：0.5～2％，Y：0.05～0.2％，Fe：余量；包壳管材外径6～10mm，管材壁厚0.2～0.6mm；在轧制变形时采用温轧+冷轧多道次复合轧制工艺或跳过热轧直接进行多道次小变形量冷轧工艺。该FeCrAl不锈钢成分在抗腐蚀、抗高温氧化、抗辐照性能优良，力学性能适中。制备方法能够加工出500kg级以上铸锭的FeCrAl不锈钢包壳管，可克服FeCrAl不锈钢晶粒粗大且不均匀、难以破碎的缺点。

The present invention discloses a FeCrAl stainless steel cladding tube and a preparation method thereof, which comprises the following components according to the mass percentage: Cr: 8 ~ 14%, Al: 3 ~ 6%, Mo: 0.5 ~ 2%, Y: 0.05 ~ 0.2%, Fe: allowance; The outer diameter of coated pipe is 6 ~ 10mm, and the wall thickness is 0.2 ~ 0.6mm; In the process of rolling deformation, the multi-pass composite rolling process of warm rolling and cold rolling is adopted or the multi-pass cold rolling process with small deformation is directly carried out without hot rolling. The FeCrAl stainless steel has excellent resistance to corrosion, oxidation at high temperature and irradiation, and moderate mechanical properties. The method can produce FeCrAl stainless steel coated tubes with ingot size of more than 500kg, which can overcome the disadvantages of coarse, uneven and difficult to break FeCrAl stainless steel grains.