20th International Forgemasters Meeting - IFM 2017

Osaka Steel Works(OSW) manufactures the high-chromium steel products,e.g. pipe used in power plant, which are forged in open-die 3,000Ton vertical press. In OSW, forging temperature must be applied to 1250℃ or higher for being loadable in press and deformable for high-chromium steel. NDT were carried out in shipping inspection, although, in some case the defects were found in the products. So that, the better methods of forging condition were required, which were able to measure both press ability and metallurgical to form. In this paper, examinations were shown about calarification of the behavior of defect using micro observation which were connected with phase transformation or mechanical property etc., and discussed about better method of forging in 3,000Ton vertical press.