2.(1) Microstructure of rapid solidification sheet in high impurity low C steel

Impurity distribution harmlessness by using the rapid solidification

Result in 2000

We manufactured cast strip of containing high impurity P and the finding was obtained that P addition decreased the α grain size and γ grain size.

In 2001

1) Elucidation of solidification phenomenon of impurity P content steel.



Creation examination of cast strip. (MHI Hiroshima R&D Center)


Segregation of P in cast strip（CMA）


2) Investigation of mechanical properties on cast strip.

　Impurities P in the low c steel are finely distributed by rapid solidification.

Rapid solidification and hot-rolling process are effective on improvement of balance of strength and ductility.

Rapid solidification＋New thermo-mechanical treatment

There is a possibility with strength 1.5 times the target of the recycling material