| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high strength steel sheet which is hardly cracked and has little anisotropy of ductility during press molding. <P>SOLUTION: The high strength steel sheet includes, in mass%, >0.0005% to <0.10% C, ≤1.5% Si, ≥0.1% to ≤3.0% Mn, ≤0.080% P, ≤0.03% S, ≥0.01% to ≤0.50% sol.Al, ≤0.005% N, and one or two kinds selected from ≤0.20% Nb and ≤0.20% Ti, and the balance comprises a composition of Fe and unavoidable impurities. For a steel structure, 60% or more in volume fraction is a ferrite phase, and for an orientation density function (ODF) äϕ1, Φ, ϕ2} of a three-dimensional crystal orientation, the intensity of the ODF ä0°, 0°, 45°} when Φ is 0°, ϕ1 is 0° and ϕ2 is 45° is ≤3.0, and the intensity of the ODF ä0°, 35°, 45°} when Φ is 35°, ϕ1 is 0° and ϕ2 is 45°, is in the range of ≥2.5 to ≤4.5. <P>COPYRIGHT: (C)2012,JPO&INPIT |
