[O18] Forming technologies for tube materials derived from closed cross-sectional characteristics

3:50 PM - 4:10 PM JST(6:50 AM - 7:10 AM UTC)

[165] Exploration of circumferential r-value measurement method for tube

^○Masaaki Mizumura¹, Soma Asai¹, Kosuke Shimizu², Ryusei Mochida², Arata Nakaura², Kazuo Uematsu³ (1.NIT, Kure College, 2.Former: NIT, Kure College, 3.Nippon Steel)