Smelting method of steel for automobile
A smelting method and automobile technology, applied in the field of steelmaking, can solve the problems of increased FeO content in slag and decreased cleanliness of molten steel, and achieve the effect of improving cleanliness
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Embodiment 1
[0055] The test casting steel is low carbon steel SDC05, and the main components are shown in Table 1.
[0056] Table 1 Main components of test steel grades / %
[0057] Finished product composition C
Finished product composition Si
Finished product composition Mn
Finished product composition P
Finished product composition S
Finished product ingredients Alt
0.0014
0.01
0.14
0.012
0.007
0.029
[0058] The test was carried out in the second casting furnace, the tapping temperature was 1663°C, RH vacuum decarburization was carried out, the vacuum degree was 0.59mbar, the decarburization time was 14min, the circulating gas flow rate was 2800NL / min, the mass percentage of carbon in the molten steel was Reduced to 15ppm;
[0059] After the decarburization is completed, the temperature of the molten steel is 1596°C, the target temperature is 1610-1630°C, and the actual temperature is 14°C lower than the target temperature. After d...
Embodiment 2
[0071] The test casting steel is low carbon steel SDC05, and the main components are shown in Table 3.
[0072] Table 3 Test steel main components / %
[0073] Finished product composition C
Finished product composition Si
Finished product composition Mn
Finished product composition P
Finished product composition S
Finished product ingredients Alt
0.0015
0.02
0.13
0.012
0.006
0.031
[0074] The test was carried out in the third casting furnace, the tapping temperature was 1665°C, RH vacuum decarburization was carried out, the vacuum degree was 0.67mbar, the decarburization time was 12min, the circulating gas flow rate was 3000NL / min, the mass percentage of carbon in the molten steel was Reduced to 12ppm;
[0075] After the decarburization is completed, the temperature of the molten steel is 1590°C, the target temperature is 1610-1630°C, and the actual temperature is 20°C lower than the target temperature. After decarburizat...
Embodiment 3
[0087] The test casting steel is low carbon steel M3A30, and the main components are shown in Table 5.
[0088] Table 5 Main components of test steel types / %
[0089] Finished product composition C
Finished product composition Si
Finished product composition Mn
Finished product composition P
Finished product composition S
Finished product ingredients Alt
0.0015
0.01
0.16
0.011
0.007
0.046
[0090] The test was carried out in the fifth casting furnace, the tapping temperature was 1676°C, RH vacuum decarburization was carried out, the vacuum degree was 0.39mbar, the decarburization time was 15min, the circulating gas flow rate was 2500NL / min, the mass percentage of carbon in the molten steel was Reduced to 14ppm;
[0091] After the decarburization is completed, the temperature of the molten steel is 1617°C, and the target temperature is 1610-1630°C. Within the target temperature range, there is no need to perform oxygen blo...
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