Steel Member And Steel Sheet

Abstract: This steel member has: a predetermined chemical composition; a microstructure at the 1/4-position composed of a total of 90% of martensite, bainite and tempered martensite by area, the 1/4-position being defined as the range, centered on the position at 1/4 of the thickness in the thickness direction from the surface, between the position at 1/8 of the thickness from the surface to the position at 3/8 of the thickness from the surface; and an aggregate structure in which when, at the 1/4-depth position, the random intensity ratio for (111) <011> is defined as I1, the random intensity ratio for (111) <112> is defined as I2, the random intensity ratio for (100) <011> is defined as I3, and the random intensity ratio for (100) <001> is defined as I4, the I1, the I2, the I3 and the I4 satisfy (I1 + I3)/(I2 + I4) = 1.20.

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