1. Laboratory of Process Metallurgy; University of Oulu; P. O. Box 4300 FI-90014 Oulu Finland
2. Materials Engineering Laboratory; University of Oulu; P. O. Box 4200 FI-90014 Oulu Finland
3. Ruukki Metals Oy; Rautaruukintie 155 FI-92100 Raahe Finland