High-reaming hot-rolled acid-pickling steel plate above 500-MPa level and manufacturing method thereof
A hot-rolled pickling and steel plate technology, which is applied in the field of metal materials, can solve problems such as non-compliance and no index of hole expansion rate
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[0028] The following examples are used to specifically illustrate the contents of the present invention, and these examples are only general descriptions of the contents of the present invention, and do not limit the contents of the present invention.
[0029] Wherein Table 1 is the chemical composition of the steel of the embodiment, Table 2 is the specific process system of the steel of the embodiment, and Table 3 is the microstructure and mechanical properties of the steel of the embodiment.
[0030] The chemical composition (wt, %) of the embodiment of the present invention of table 1
[0031] Example
C
Si
mn
P
S
Al
Nb
Mo
1
0.07
0.01
1.40
0.008
0.003
0.05
0.010
0.20
2
0.06
0.02
1.28
0.006
0.004
0.03
0.012
0.30
3
0.05
0.01
1.21
0.003
0.003
0.04
0.01320
0.35
4
0.04
0.03
1.25
0.004
0.002
0.04
0.0140.40
0.32
5
0.0...
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