High-strength cold-rolled steel sheet and manufacturing method therefor
A technology of cold-rolled steel sheet and manufacturing method, which is applied in the field of high-strength cold-rolled steel sheet and its manufacture, can solve the problem of reduced reactivity between steel sheet and chemical conversion treatment solution, and achieves good chemical conversion treatment property, stable manufacturing, and excellent corrosion resistance. sexual effect
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[0082] As the test material, a continuous annealing material (cold-rolled steel sheet) having the component composition and tensile strength TS shown in Table 1 was used. These steel sheets were pickled, washed with water, and dried under the conditions shown in Table 2 and Table 3, and then subjected to temper rolling with an elongation of 0.7% to produce high-strength cold-rolled steel sheets No. 1 to 33. It should be noted that the Fe of the pickling solution 3+ The ion concentration is adjusted by the method described above.
[0083] A test piece was collected from each manufactured steel plate, and 5 locations on the surface of the test piece selected arbitrarily were analyzed in the depth direction by glow discharge emission spectroscopy (GDS), and it was investigated whether Al, Si, Mn, and O were displayed. The peaks of Al, Si, Mn, and O are evaluated as "existence (remaining) of oxide layer", and the cases where none of the peaks appear are evaluated as "absence" (Remai...
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