Teiichi Enami

TL;DR: In this article, a mathematical model for prediction of roll force calculation in plate rolling has been developed, which can be calculated with good accuracy by the model and can be expressed as a function of the observed deformation resistance and the calculated one for strain free austenite.

TL;DR: In this article, a shell ring for an RPV of a 1300 MWe type PWR was forged from a 200-ton hollow ingot, and its very high quality regarding the internal qualities, tensile properties, fracture toughness, fatigue properties and underclad cracking properties were confirmed.

Abstract: Synopsis : The strength, ductility and notch toughness of Mn-Ni-Mo and Cr-Mo steels for pressure vessel are shown at the different level of cooling rates and tempering conditions. These results are summarized as follows: (1) Along with an increase in the tempering parameter, defined by T(20+log t) where T: temperature and t: holding time, the strength lowered continuously, but the ductility and the toughness gradually improved, passed through a maximum value, and finally lowered. (2) The tempering parameter corresponding to maximum toughness was found to depend on cooling rates for Mn-Ni-Mo steel, but not for Cr-Mo steel. Level of maximum toughness, however, changed with cooling rates for both steels. (3) With respect to ductility, neither tempering parameter corresponding to maximum value nor level of maximum value much depended on cooling rates for both steels.

TL;DR: In this article, the effects of austenitizing temperature and manganese, silicon, and phosphorus contents on temper embrittlement of 2 1/4 Cr-1Mo steel associated with its strength were studied using laboratory heats.