Acerinox,- Birta Isbania Acerinox, S.A. (Spanish: [aθeɾinoks]) is a Spanish-based steel unit. The company was established in 1970, and was acquired technical support from Japanese company Nisshin Steel. Nisshin will continue to hold about 15% Acerinox until April 2010. [2] The center is located in Madrid. The chairman is Rafael Naranjo. Since 2008, the company has been the world's largest producer of iron. [3]