Smelting method of ultra-low carbon steel
A smelting method, ultra-low carbon steel technology, applied in the field of iron and steel smelting, can solve the problems of high smelting cost, large equipment damage, complex smelting method, etc., to improve the life of the oxygen lance, reduce the temperature rise of oxygen blowing and aluminum, and reduce the temperature of the oxygen lance The effect of frequency of use
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[0022] Example 1
[0023] A method for smelting ultra-low carbon steel, comprising the following process steps:
[0024] In step a, the molten iron is desulfurized, and the sulfur content in the molten iron after desulfurization is less than or equal to 0.003%; after the desulfurization treatment, converter smelting is performed, and the converter smelting process uses slag blocking marks and slide plates to block slag, so as to avoid slag returning to phosphorus, and the converter is at the bottom of the whole process. Argon blowing, bottom blowing argon flow controlled at 300Nm 3 / h, the mass content of C in the converter tapping molten steel is 0.03%, and the O content is controlled at 700ppm; the final temperature of the converter is 1630℃; the height of the remaining space of the ladle after the converter tapping is 300mm; the tapping time is 5min, and the converter tap The mass content of C in the molten steel of the steel was 0.03%, and the O content was 700 ppm.
[0...
Example Embodiment
[0028] Example 2
[0029] A method for smelting ultra-low carbon steel, comprising the following process steps:
[0030] In step a, the molten iron is desulfurized, and the sulfur content in the molten iron after desulfurization is less than or equal to 0.003%; after the desulfurization treatment, converter smelting is performed, and the converter smelting process uses slag blocking marks and slide plates to block slag, so as to avoid slag returning to phosphorus, and the converter is at the bottom of the whole process. Argon blowing, the bottom blowing argon flow is controlled at 350Nm 3 / h, the mass content of C in the converter tapping molten steel is 0.035%, and the O content is 800ppm; the final temperature of the converter is 1640℃; the height of the remaining space of the ladle after the converter tapping is 400mm; the tapping time is 6min, and the converter tapping The mass content of C in the molten steel is 0.04%, and the O content is 800 ppm.
[0031] In step b, t...
Example Embodiment
[0034] Example 3
[0035] A method for smelting ultra-low carbon steel, comprising the following process steps:
[0036] In step a, the molten iron is desulfurized, and the sulfur content in the molten iron after desulfurization is less than or equal to 0.003%; after the desulfurization treatment, converter smelting is performed, and the converter smelting process uses slag blocking marks and slide plates to block slag, so as to avoid slag returning to phosphorus, and the converter is at the bottom of the whole process. Argon blowing, bottom blowing argon flow controlled at 400Nm 3 / h, the mass content of C in the converter tapping molten steel is within 0.04%, and the O content is 900ppm; the final temperature of the converter is 1650°C; the height of the remaining space of the ladle after the converter tapping is 500mm; the tapping time is 8min, and the converter tap The mass content of C in the molten steel of the steel was 0.04%, and the O content was 900 ppm.
[0037] I...
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