It can be smelted with a Smithing level of 45 and 30% favour with the Lovakengj House in Great Kourend. You cannot smelt this bar in a normal furnace. If you try, it'll just say it's not the right temperature. You must use the "Lovakite furnace" just south of the blast mining bank (accessible instantly by using Xeric's talisman to teleport to Xeric's Inferno). Alternatively, using Superheat Item will work as well.