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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Embodiment 1
[0021] Embodiment 1 of the present invention comprises the following steps successively:
[0022] (1) Converter smelting and refining: the steel produced is high-carbon low-alloy steel, the steelmaking furnace adopts a 100-ton converter, the tapping amount is 98.75 tons, the weight percentage of tapping carbon is 0.58%, and the tapping temperature is 1665°C ; Then after the molten steel is refined in the LF furnace, when it is refined in the VD device, the normal argon blowing pressure: 0.4-0.6MPa, the flow rate: 300-350NL / min, after 25 minutes, the molten steel is weakly blown with argon, the flow rate: 100-150NL / min, the time is 5 minutes, the temperature of molten steel at the end of refining is 1557°C, the composition of molten steel is: C: 0.58%, Si: 1.85%, Mn: 0.78%, P: 0.008%, S: 0.003%, Cr: 0.21% .
[0023] (2) Continuous casting: molten steel is poured into the tundish through the sliding nozzle at the bottom of the ladle, the temperature of the molten steel in the ...
Embodiment 2
[0029] Embodiment 2 of the present invention comprises the following steps successively:
[0030] (1) Converter smelting and refining: the steel produced is high-carbon low-alloy steel, the steelmaking furnace adopts a 100-ton converter, the tapping amount is 101.65 tons, the weight percentage of tapping carbon is 0.58%, and the tapping temperature is 1673°C ; Then after the molten steel is refined in the LF furnace, when it is refined in the VD device, the normal argon blowing pressure: 0.4-0.6MPa, the flow rate: 300-350NL / min, after 25 minutes, the molten steel is weakly blown with argon, the flow rate: 100-150NL / min, the time is 5 minutes, the temperature of molten steel at the end of refining is 1563°C, the composition of molten steel is: C: 0.63%, Si: 1.93%, Mn: 0.92%, P: 0.013%, S: 0.005%, Cr: 0.24% .
[0031] (2) Continuous casting: molten steel is injected into the tundish through the sliding nozzle at the bottom of the ladle, the temperature of the molten steel in t...
Embodiment 3
[0037] Embodiment 3 of the present invention comprises the following steps successively:
[0038] (1) Converter smelting and refining: the steel produced is high-carbon low-alloy steel, the steelmaking furnace adopts a 100-ton converter, the tapping amount is 103.45 tons, the weight percentage of tapping carbon is 0.51%, and the tapping temperature is 1670°C ; Then after the molten steel is refined by the LF furnace, when the VD device is refined, the normal argon blowing pressure: 0.4-0.6MPa, the flow rate: 300-350NL / min, after 25 minutes, the molten steel is weakly blown argon, the flow rate: 100-150NL / min min, the time is 6 minutes, the temperature of molten steel at the end of refining is 1567°C, the composition of molten steel is: C: 0.64%, Si: 1.97%, Mn: 0.84%, P: 0.011%, S: 0.005%, Cr: 0.25%.
[0039] (2) Continuous casting: molten steel is poured into the tundish through the sliding nozzle at the bottom of the ladle, the temperature of the molten steel in the tundish i...
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