Nippon Steel Sumitomo Metal Corporation

Toshiyuki Kajitani

Yasuhiko Otani

Akihito Kiyose

Mineo Niizuma

A continuous cast slab includes the following component: by mass %, C: 0.01&#x2dc;0.3%, Si: 0.05&#x2dc;0.5%, Mn: 0.4&#x2dc;2%, P: 0.03% or less, S: 0.03 or less, Al: 0.005&#x2dc;0.03%, Ni: 0.2&#x2dc;2%, O: 0.006% or less, and N: 0.006% or less; wherein the balance is composed of Fe and inevitable impurities; wherein a structure in steel in a region within at least 2 mm from a broad surface is composed of ferrite and pearlite and a equivalent circular diameter of ferrite grains in the region is equal to or shorter than 30 &#x3bc;m.

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Tokyo, Japan

Toshiyuki Kajitani