| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tubular electromagnetic shield material employing a steel pipe. <P>SOLUTION: A steel pipe having a composition containing 0.01% or less of C, 95% or more of Fe, or further containing a proper amount of Si and Al, or a proper amount of Cr is preferably subjected to shrink rolling or further subjected to annealing treatment, thus obtaining a steel pipe having such a composition as the three-dimensional random strength ratio of X ray is 3.0 or above, the r value is 2.0 or above, and the average crystal grain size is 20 μm or above in the crystal orientation in which <100> is oriented in the circumferential direction and <011> is oriented in the rolling direction. When a tubular electromagnetic shield material is composed using that steel pipe, electromagnetic shield characteristics are enhanced remarkably. <P>COPYRIGHT: (C)2007,JPO&INPIT |
