| 摘要 |
<p>The invention provides a high strength cold rolled steel sheet comprising ferrite phases and second phases, in which the mean grain size of the ferrite phases is 20 mu m or less, the volume fraction of the second phase is 0.1% or more to less than 10%, the absolute value ¾ DELTA r¾ of in-plane anisotropy of r value is less than 0.15, and the thickness is 0.4mm or more. The high strength cold rolled steel sheet of the present invention has a tensile strength of 370 to 590MPa, and has excellent stretchability, dent resistance, surface precision, secondary working embrittlement, anti-aging, and surface appearance, therefore it is suitable for outer panels of automobile. <IMAGE></p> |
