Ultra-low carbon baking hardening cold-roll steel sheet and preparation method thereof
A technology of cold-rolled steel plate and cold-rolled reduction rate, which is applied in the field of cold-rolled steel plate, and can solve other problems such as poor performance and difficult smelting control
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[0084] The present invention also provides a kind of preparation method of cold-rolled steel plate, comprises the following steps:
[0085] 1) Coil the hot-rolled steel plate after rapid cooling, and then perform cold rolling to obtain a cold-rolled hard coil;
[0086] 2) The cold-rolled hard coil obtained in the above steps is subjected to continuous annealing, and then subjected to aging treatment to obtain a cold-rolled steel plate.
[0087] The principles of selection and optimization of the elements and their contents in the steel sheet in the present invention correspond to the selection and optimization principles of the elements and their contents in the aforementioned low-carbon bake-hardened cold-rolled steel sheets, and will not be repeated here.
[0088] In the invention, firstly, the hot-rolled steel plate is rapidly cooled, then coiled, and then cold-rolled to obtain a cold-rolled hard coil.
[0089] The present invention has no special limitation on the hot rol...
Embodiment 1
[0122] The composition of the slab after hot metal desulfurization, converter smelting, LF treatment, RH decarburization and continuous casting is shown in Table 1. Among them, [C]-12([Ti]-48[N] / 14) / 48 is 0.0010%, and 37[Mn]+83[Si]+470[P] is 41.2.
[0123] See Table 1, which shows the composition (Wt.%) of the ultra-low carbon bake-hardened cold-rolled steel sheet in the examples of the present invention.
[0124] Table 1
[0125] element
C
Si
mn
P
S
Ti
Al
N
Example 1
0.0023
0.05
0.38
0.049
0.007
0.013
0.036
0.0023
Example 2
0.0015
0.04
0.36
0.045
0.006
0.008
0.03
0.0021
Example 3
0.0020
0.05
0.45
0.059
0.005
0.007
0.042
0.0028
Example 4
0.0020
0.06
0.4
0.051
0.007
0.012
0.032
0.0026
Example 5
0.0021
0.05
0.39
0.05
0.006
0.011
0.034
0.0017
[0126] The slab is preheated, heated and s...
Embodiment 2
[0132] The composition of the slab after hot metal desulfurization, converter smelting, LF treatment, RH decarburization and continuous casting is shown in Table 1. Among them, [C]-12([Ti]-48[N] / 14) / 48 is 0.0013%, and 37[Mn]+83[Si]+470[P] is 37.8.
[0133] See Table 1, Table 1 shows the composition of the ultra-low carbon bake-hardened cold-rolled steel sheet in the embodiment of the present invention.
[0134] The process is the same as in Example 1, except that the finishing temperature of hot rolling is controlled at 912°C, the coiling temperature is 714°C, and the annealing temperature is 813°C.
[0135] The appearance inspection and performance testing of the finished product prepared in Example 2 of the present invention showed that the finished product has good surface quality and good performance, and has good deep drawing performance (r90), bake hardening (BH2) performance and aging resistance (AI) index.
[0136] See Table 2, Table 2 shows the performance test results...
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