| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a high-strength steel sheet that exhibits excellent chemical treating properties and corrosion resistance after electrodeposition coating, and to provide a manufacturing method therefor. <P>SOLUTION: The steel sheet contains, by mass, 0.01 to 0.18% C, 0.4 to 2.0% Si, 1.0 to 3.0% Mn, 0.001 to 1.0% Al, 0.005 to 0.060% P, and 0.01% or less S, with the remainder comprising Fe and unavoidable impurities. During a temperature increasing step, when performing continuous annealing on the steel sheet, the rate of temperature increase is set to be 8°C/s or higher and the atmospheric hydrogen concentration is set to be 22 vol% or more at an annealing-furnace temperature range of 600°C or more and A°C or less, wherein the range of A is 700≤A≤900. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
