Low-carbon, low-silicon, cold-rolled and hot-galvanized dual-phase steel for extra-deep drawing and preparation method thereof
A low-carbon, low-silicon, dual-phase steel technology is applied in the field of low-carbon, low-silicon, cold-rolled hot-dip galvanized dual-phase steel for ultra-deep drawing and its preparation field. The effect of expanding the use ratio
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[0023] According to the chemical composition given in Table 1, vacuum smelting in an electromagnetic induction furnace is used to carry out subsequent processes on the cast blank.
[0024] Table 1 is the mass percent of each composition
[0025]
C
Si
mn
P
S
Al
Cr
Mo
Example 1
0.036
0.038
1.34
0.013
0.005
0.07
0.52
0.36
Example 2
0.039
0.043
1.55
0.008
0.003
0.055
0.57
0.42
[0026] Example 3
0.043
0.048
1.68
0.004
0.001
0.025
0.63
0.45
[0027] The above hot rolling process is to heat the forged billet to 1200°C and keep it warm for 1.5 hours, then hot rolling on a hot rolling mill for 6 passes to obtain a hot rolled sheet with a thickness of about 3-4mm, with a total deformation of 85%-90 %, the rolling, finishing and simulated coiling temperatures are 700°C.
[0028] The cold rolling process is to ro...
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