Hard-face welding wire for continuous casting roller of horizontal section of continuous casting machine

The invention discloses a hard-face welding wire for a horizontal section continuous casting roller of a continuous casting machine. The hard-face welding wire comprises the following components in percentage by weight: 0.05-0.07% of C, 4.0-6.0% of Mg, 0.03-0.10% of Mn, 0.05-0.10% of Cr, less than or equal to 0.25% of Si, less than or equal to 0.40% of Cu, less than or equal to 0.20% of Cu, less than or equal to 0.20% of Zn, less than or equal to 0.0003% of Be, 0.10-0.15% of Cr and the balance of Al and other inevitable impurities. In order to reach a high strength grade, a certain content of C is essential, but the content of C cannot be too high, otherwise, the toughness of deposited metal is seriously influenced, so that the content of C is controlled to be 0.06, a certain strength guarantee is provided for the deposited metal by properly adding Mn, and meanwhile, Mn has desulfurization and deoxidation effects in a molten pool process, so that the toughness of the deposited metal is greatly improved. The c