*Sheet Steel*

We are studying the effects of rapid solidification and thermo-mechanical treatment for high P low carbon steel. Other impurities like Cu and S are also interested.

	Fine dispersion of segregated P due to rapid solidification
Segregation of P in cast strip (CMA)		Better combination of strength and ductility due to P addition

*Medium Thickness Slabs*

We are examining multidirectional deformation method through experiments and numerical simulation, which can effectively make fine ferrite structure in relatively thin casting materials of several 10 mm thick.

		Fe-C	Fe-C-P
		Randomized ODF structure due to P addition
Introduction of shear strain by newly developed cross-roll rolling simulator		EBSD Analysis

Technology for creation of Short Round (SR) Bar Steel

We are studying processes of steel production with high P content without deteriorating their toughness.
We have improved the combination of strength and toughness (see the figure below), through creating an ultrafine ferrite structure (see the photographs below) by multi-directional bar rolling.

	Ferrite + Pearlite (F/P)
	Quench and Tempered Martensite (QT)
	Ultra-fine Ferrite (UfF)
Relationship between Ductile-to-Brittle Transition Temperature (DBTT) and Yield Strength for various structure (left:strength and toughness/right: ferrite structures)