1. Steel Rolling R&D Division, Process Research Laboratories, Technical Research & Development Bureau, Nippon Steel & Sumitomo Metal Corporation, Amagasaki, Japan
2. Speciality Tubing Manufacturing Division, Amagasaki Works, Pipe & Tube Unit, Nippon Steel & Sumitomo Metal Corporation, Amagasaki, Japan
3. Department of Mechanical and System Engineering, Kyoto Institute of Technology, Kyoto, Japan
4. Kiuchi Laboratory, Tokyo, Japan