Smelting process for producing low-carbon ultralow-phosphorus steel in converter
An ultra-low phosphorus steel and process technology, applied in the direction of manufacturing converters, etc., can solve the problems of increased equipment costs, increased process steps, and high product costs, and achieve the effects of short product flow, low cost, and energy saving
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Embodiment 1
[0023] A smelting process for producing low-carbon ultra-low-phosphorus steel with a converter according to the present invention, in which the molten iron desulfurized once is produced through the smelting process of twice slagging in the converter to produce low-carbon ultra-low-phosphorus steel, and the specific steps are:
[0024] The molten iron after desulfurization once, with a P content of 0.13%, is dephosphorized by the slagging and blowing method twice in the early stage and the later stage, and the slag is adjusted by ferrosilicon. The degree of iron oxide in the slag is 1.9, and the iron oxide content in the slag is 15%; the temperature measured by the secondary gun at the blowing 75% in the later stage is 1540°C; the slag basicity is 4.8, the iron oxide content in the slag is 24%, and the target end point temperature is 1560°C . A low-carbon ultra-low phosphorus steel with a carbon content (mass percentage) of 0.038% and a phosphorus content (mass percentage) of 0...
Embodiment 2
[0026] A smelting process for producing low-carbon ultra-low-phosphorus steel with a converter according to the present invention, in which the molten iron desulfurized once is produced through the smelting process of twice slagging in the converter to produce low-carbon ultra-low-phosphorus steel, and the specific steps are:
[0027] The molten iron after desulfurization once, with P content of 0.12%, is dephosphorized by two slagging and blowing methods in the early stage and the later stage, and slag is adjusted by ferrosilicon. The degree of iron oxide in the slag is 1.5, and the iron oxide content in the slag is 12%; the temperature measured by the secondary gun at the blowing 79% in the later stage is 1550°C; , to obtain a carbon content (mass percentage) of 0.042%, a phosphorus content (mass percentage) of 0.0046% low-carbon ultra-low phosphorus steel.
Embodiment 3
[0029] A smelting process for producing low-carbon ultra-low-phosphorus steel by a converter according to the present invention, the process uses molten iron desulfurized once to produce low-carbon ultra-low-phosphorus steel through the smelting process of three times of slagging in the converter, and the specific steps are:
[0030] The molten iron after primary desulfurization, with a P content of 0.13%, is dephosphorized by three slagging and blowing methods in the early, middle and late stages, and ferrosilicon is used to adjust the slag. For slag dumping, the basicity of the slag is 1.1, and the iron oxide content in the slag is 11%; when the sub-lance is blowing 72%, the measured temperature is 1530°C, the slag dumping, the slag basicity is 4.1, and the iron oxide content in the slag is 20%; Then add lime and lightly burned dolomite in an appropriate amount to carry out the final carbon drawing and temperature rise. The target end point temperature is 1580°C, and the stee...
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