Roasted and hardened hot galvanized steel plate and preparation method thereof
A hot-dip galvanized steel sheet and bake hardening technology, applied in the field of hot-dip galvanized steel sheet production, can solve the problems of poor elongation performance and poor mechanical properties of hot-dip galvanized steel sheet, and achieve the effects of excellent surface quality and excellent formability.
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[0027] The present invention also provides a method for preparing the above-mentioned bake-hardened hot-dip galvanized steel sheet, comprising the following steps:
[0028] The smelted molten steel is subjected to smelting-hot rolling-acid rolling-hot-dip galvanizing-annealing steps to obtain hot-dip galvanized steel sheets; the hot-rolling includes heating, dephosphorization, rough rolling, finish rolling, laminar cooling and coiling steps.
[0029] Wherein, in the preparation method of the above-mentioned bake-hardened hot-dip galvanized steel sheet, in order to prevent warping defects in the hot rolling process and ensure the high-temperature coiling temperature at the same time, the starting temperature of the finish rolling in the hot rolling is 1100-1250° C. The rolling temperature is 880-960°C.
[0030] Wherein, in the preparation method of the above-mentioned bake-hardened hot-dip galvanized steel sheet, in order to obtain a suitable ferrite and pearlite structure in t...
Embodiment 1-3
[0035] Embodiment 1-3 prepares hot-dip galvanized steel sheet with the inventive method
[0036] The specific operation steps are as follows:
[0037] (1) through common smelting process, prepared the baking hardening steel slab of chemical composition as shown in table 1 below:
[0038] Table 1 Chemical composition of bake-hardened hot-dip galvanized steel sheet (wt.%)
[0039] Numbering
C
Si
mn
P
S
Ti
als
1
0.0016
0.05
0.12
0.008
0.004
0.011
0.029
2
0.0020
0.04
0.18
0.005
0.005
0.014
0.036
3
0.0026
0.06
0.16
0.006
0.007
0.016
0.045
[0040] (2) After the above-mentioned slab is heated, dephosphorized, hot-rolled and laminar-flow cooled, a hot-rolled coil is obtained, wherein each parameter is set as shown in Table 2 below:
[0041] Table 2 Main process parameters of hot rolling
[0042] Numbering
Finishing temperatu...
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