Preparation method of sulfur-containing steel for engineering machinery
A technology for construction machinery and molten steel, which is applied in the field of preparation of sulfur-containing construction machinery steel, can solve the problems of complex preparation method of sulfur-containing steel, large consumption of iron and steel materials, and high requirements for comprehensive production coordination, and achieves a simple and controllable preparation process, The effect of reducing defects such as low recovery rate and porosity
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[0020] Example 1
[0021] The method for preparing sulfur-containing engineering machinery steel of the present invention includes the following steps:
[0022] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process to ensure that the molten iron has a sufficient amount of residual sulfur after the converter smelting. During the converter smelting process, the mass percentage of C at the end of the converter is controlled to 0.062% (tap oxygen 344ppm), the tapping temperature is 1617℃;
[0023] (2) Converter tapping: Turn on the converter bottom stirring before tapping the molten steel to reduce the oxidation of molten steel and the P content of molten steel, and pour the slag before tapping the converter; add 15kg of high purity graphite in the early stage of tapping for pre-deoxidation, and then sequence Add ferrosilicon (25kg), ferromanganese (high carbon ferromanganese 633kg, silicon manganese 1065kg), aluminu...
Example Embodiment
[0027] Example 2
[0028] The method for preparing sulfur-containing engineering machinery steel of the present invention includes the following steps:
[0029] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process to ensure that the molten iron has a sufficient amount of residual sulfur after the converter smelting. During the converter smelting process, the mass percentage of C at the end of the converter is controlled to 0.098% (tap oxygen 307ppm), the tapping temperature is 1606℃;
[0030] (2) Converter tapping: Turn on the converter bottom stirring before tapping the molten steel to reduce the oxidation of molten steel and the P content of molten steel, and pour slag before tapping the converter; add 18kg of high purity graphite in the early stage of tapping for pre-deoxidation, and then sequence Add ferrosilicon (67kg), ferrochromium (183kg), ferromanganese (silicomanganese 1019kg), aluminum block (80kg) an...
Example Embodiment
[0034] Example 3
[0035] The method for preparing sulfur-containing engineering machinery steel of the present invention includes the following steps:
[0036] (1) Converter smelting: The molten iron pre-desulfurization process is not carried out before the converter smelting process to ensure that the molten iron has a sufficient amount of residual sulfur after the converter smelting. During the converter smelting process, control the converter end point C mass percentage to 0.18% (tap oxygen 180ppm), the tapping temperature is 1625℃;
[0037] (2) Converter tapping: Turn on the converter bottom stirring before tapping the molten steel to reduce the oxidation of molten steel and the P content of molten steel, and pour the slag before tapping the converter; add 15kgC powder for pre-deoxidation in the early stage of tapping, and then add silicon sequentially Manganese (1321kg), aluminum block (80kg) and lime 514kg, composite refining slag 431kg for deoxidation alloying, composite ref...
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