The invention belongs to the technical field of
welding rod preparation, and discloses a heat-resistant steel hand
welding rod for ultra-supercritical CB2 steel and a preparation method thereof. The heat-resistant steel hand
welding rod is composed of a special H08Cr9MoV
alloy core wire (produced by Jiangsu Yonggang Group Co., Ltd.) with low content of impurities such as
phosphorus and
sulfur and a
coating wrapping the surface of the special H08Cr9MoV
alloy core wire. The main components of cladding
metal are 9% of Cr, 1.5% of Mo, 1% of Co, 1% of Ni and 0.2% of V, and meanwhile, trace
alloy elements such as Nb, N and B are added, so that the weld joint deposited
metal has good mechanical properties, especially
impact energy performance after heat treatment, and the
impact energy is larger than or equal to 47J in a normal temperature state. The tensile strength of the deposited
metal and a
welding joint is 630-750MPa under the heat treatment condition of 730-740 DEG C and time of 12h. According to the hand welding rod manufactured by the method, electric arcs are stable in the
welding process, splashing is small, welding
slag is uniform in covering,
slag removal is good, weld joint forming is attractive, all-position welding can be carried out, and the
welding process performance is good.