| 摘要 |
PROBLEM TO BE SOLVED: To provide an extra thick steel plate for a magnetic shield in which, even if it is made into the one of >=150 mm thickness using a continuously cast slab as the stock, center porosities can effectively be press-contacted, and which has excellent magnetic properties in the high magnetic fields of 10 kA/m and 20 kA/m, and to provide a production method therefor. SOLUTION: In the extra thick steel plate for a magnetic shield, a slab obtained by continuous casting, and having a composition containing, by mass, <=0.007% C, <=0.02% Si, <=0.06% Mn, <=0.015% P, <=0.050% Al, <=0.005% N, and the balance Fe with inevitable impurities is used as the stock. The stock is subjected to forging and heat treatment, and the plate thickness of the steel plate is >=150 mm, and the means grain diameter thereof is >=1 mm.
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