Method for producing low-alloy and large-size square steel by continuously casting and continuously rolling
A continuous casting, continuous rolling, low alloy technology, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve problems such as the unqualified rate, and achieve the effects of slowing down the impact, improving the qualification rate, and reducing center porosity
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Example Embodiment
[0020] Example 1
[0021] Embodiment 1 of the present invention sequentially includes the following steps:
[0022] (1) Converter smelting and refining: The production steel is high-carbon low-alloy steel. The steel-making furnace uses a 100-ton converter, with a tapping volume of 98.75 tons, a tapping carbon weight percentage of 0.58%, and a tapping temperature of 1665°C. ; After the molten steel is refined by the LF furnace, when refining in the VD device, the normal argon blowing pressure: 0.4~0.6MPa, flow rate: 300~350NL / min, 25 minutes later, weak argon blowing on the molten steel, flow rate: 100~150NL / min, the time is 5 minutes, the molten steel temperature at the end of refining is 1557℃, the molten steel composition is: C: 0.58%, Si: 1.85%, Mn: 0.78%, P: 0.008%, S: 0.003%, Cr: 0.21% .
[0023] (2) Continuous casting: The molten steel is injected into the intermediate tank through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the int...
Example Embodiment
[0028] Example 2
[0029] Embodiment 2 of the present invention sequentially includes the following steps:
[0030] (1) Converter smelting and refining: The production steel is high-carbon low-alloy steel. The steel-making furnace uses a 100-ton converter, with a tapping volume of 101.65 tons, a tapping carbon weight percentage of 0.58%, and a tapping temperature of 1673℃ ; After the molten steel is refined by the LF furnace, when refining in the VD device, the normal argon blowing pressure: 0.4~0.6MPa, flow rate: 300~350NL / min, 25 minutes later, weak argon blowing on the molten steel, flow rate: 100~150NL / min, the time is 5 minutes, the molten steel temperature at the end of refining is 1563℃, the molten steel composition is: C: 0.63%, Si: 1.93%, Mn: 0.92%, P: 0.013%, S: 0.005%, Cr: 0.24% .
[0031] (2) Continuous casting: The molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle. The temperature of the molten steel in the tundish is 149...
Example Embodiment
[0036] Example 3
[0037] Embodiment 3 of the present invention sequentially includes the following steps:
[0038] (1) Converter smelting and refining: The production steel is high-carbon low-alloy steel. The steel-making furnace uses a 100-ton converter, with a tapping volume of 103.45 tons, a tapping carbon weight percentage of 0.51%, and a tapping temperature of 1670℃. ; After the molten steel is refined by the LF furnace, the normal argon blowing pressure: 0.4~0.6MPa, the flow rate: 300~350NL / min during the refining of the VD device, 25 minutes later, the molten steel is weakly blown with argon, the flow rate: 100~150NL / min, the time is 6 minutes, the molten steel temperature at the end of refining is 1567°C, the molten steel composition is: C: 0.64%, Si: 1.97%, Mn: 0.84%, P: 0.011%, S: 0.005%, Cr: 0.25%.
[0039] (2) Continuous casting: The molten steel is injected into the intermediate tank through the sliding nozzle at the bottom of the ladle. The temperature of the molte...
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