This type of specialty casing is a brand new patent product and self-developed as a non-pipe for heavy oil thermal recovery applications. The pipe body is made of Cr－Mo steel. The high thermal stability and collapse resistance features of such material lead to better field performances, such as high connection strength, good thermal distortion resistance and reliable gas tightness. It can survive more than 6 cycles of steam injections, which doubles the conventional casing working life in thermal recovery wells. This product proves to be a better solution for the high casing damage rate existed in thermal recovery applications.