| 摘要 |
<p>PURPOSE:To effectively prevent edge crack and also to produce a hot rolled Fe-Ni alloy strip without adversely affecting rolling efficiency, plating suitability, etc., by subjecting a continuously cast slab of Fe-Ni alloy to temp. rise up to soaking temp. at specific velocity and then to specific hot rolling. CONSTITUTION:A continuously cast slab of an Fe-Ni alloy containing about 35-55wt.% Ni is heated by means of a heating furnace and hot-rolled so as to be formed into a hot rolled strip. At this time, temp. is elevated at a rate of <=15 deg.C/min until surface temp. of this slab reaches 600-1000 deg.C and further elevated at a rate of <=3 deg.C/min from 1000 deg.C to soaking temp. Moreover, rolling in the first pass at the time of hot rolling is carried out at >=900 deg.C at >=15% reduction of area. By limiting temp. rise velocity in the brittle temp. region by the above procedure, reduction of thermal stress established in the slab and prevention of internal crack can be attained, and the edge crack of the hot rolled strip can be reduced. Further, by the hot rolling applied to the slab heated under controlled temp. rise rate, edge crack can be remarkably inhibited owing to the grain refining effect attendant upon heavy draft.</p> |
