Bake-hardenable cold rolled steel sheet with superior strength, galvannealed steel sheet using the cold rolled steel sheet and method for manufacturing the cold rolled steel sheet
A technology for baking hardened and cold-rolled steel sheets, applied in the fields of diffusion annealed galvanized steel sheets, cold-rolled steel sheets, and high-strength cold-rolled steel sheets, which can solve problems such as limitations and poor performance
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Embodiment 1
[0200] After the steel slabs having the compositions shown in Table 1 were hot-rolled to form hot-rolled steel sheets, the hot-rolled steel sheets were subjected to hot coiling, cold rolling, and continuous annealing under the conditions listed in Table 2. Then, the annealed cold-rolled steel sheet is subjected to a galvanized layer diffusion annealing treatment at 450° C., and then leveled at a leveling reduction ratio of about 1.5%. After that, the BH value, aging index (AI), grain size and ductility-brittle transition temperature (DBTT) at 2.0 drawing ratio (drawingratio) of the final steel plate were measured (in order to evaluate secondary processing embrittlement), the results of these measurements Shown in Table 2.
[0201] In addition, after annealing, observe the microstructure of No. 4 steel of the present invention with a microscope magnified 200 times, the results are shown in Image 6 middle.
[0202] In addition, the DBTT of steel No. 6 according to the inventi...
Embodiment 2
[0226] After the steel slabs having the compositions shown in Table 3 were hot-rolled to form hot-rolled steel sheets, the hot-rolled steel sheets were coiled, cold-rolled, and continuously annealed under the conditions listed in Table 4. Then, the annealed cold-rolled steel sheet is subjected to a galvanized layer diffusion annealing treatment at 450° C., and then leveled at a leveling reduction ratio of about 1.5%. After that, the BH value, aging index (AI) and grain size of the final steel sheets were measured, and the results of these measurements are shown in Table 4.
[0227] Table 3 lists the compositions of the steel sheets of the present invention and comparative steel sheets produced under strict control of C, Ti, soluble Al and Mo. In Table 3, steel Nos. 15-30 are steels of the present invention, and steel Nos. 21-26 are comparative steels.
[0228] Table 4 lists the manufacturing conditions and steel sheet properties using steel slabs having the compositions shown...
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