Abstract: HR3C seamless steel tubes were produced by hot-extrusion and cold rolling processes. The process of metal cold-forming and the performance of finished-products indicate that hot-extrusion and cold rolling processes have obvious advantage in manufacturing finished-products of high alloy steel with hard deformation. Metal withstands three-dimensional compressive stress during deformation in the hot-extrusion process, which can improve the comprehensive performance of metal pipes. The improvement of surface quality and dimension precision through cold rolling processing can ensure the higher safety of materials used in special environment.