Excellence in Gray Iron and Ductile Iron Castings Earns Company Innovation Award. Waupaca Foundry, a Hitachi Metals Group company, is celebrating its 60th year in business. When iron casting began on the banks of the Waupaca River in 1955, company leaders could not predict their business would become the world’s largest gray and ductile iron producer. Today, Waupaca Foundry employs 3,900 employees at six…