Method for producing hot rolled steel coils
A technology of hot-rolled steel coils and production methods, applied in the direction of improving process efficiency, etc., can solve the problems of poor material comprehensive performance, large strength margin, and low elongation, and achieve improved welding performance, good surface quality, and elongation Improved effect
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Embodiment 1
[0046] 1) After the composition is designed, the molten iron is pretreated, then the converter is smelted, nitrogen and argon are switched, and the molten steel is obtained after tapping; it is supplemented before tapping, and the tapping time is 4.5min; the alloy is added before 4 / 5 tapping; Double-stop slag for tapping, 80mm thickness of slag at the station; the processing time of argon blowing at the argon station is 17 minutes;
[0047] 2) The weight percentages of the components of the molten steel after tapping are as follows: C 0.06%, Si 0.20%, Mn 1.20%, P0.010%, S 0.005%, Nb+Ti+V 0.040%, Als 0.020%, and the rest It is iron and unavoidable impurities; the molten steel is continuously cast to obtain a slab, in which the molten steel in the tundish is 25t and the liquid level is 550mm when the tundish in the first continuous casting furnace is opened; the molten steel in the tundish is 15t when the tundish is changed quickly , The liquid level is 350mm; the normal pouring ti...
Embodiment 2
[0051] 1) After the composition is designed, the molten iron is pretreated, then the converter is smelted, nitrogen and argon are switched, and the molten steel is obtained when tapping; 0 times of supplementary blowing before tapping, tapping time 6.0min; adding alloy before tapping 4 / 5; Double-stop slag for tapping, the thickness of the slag at the station is 60mm; the processing time of the argon station is 25min;
[0052] 2) The weight percentages of the components of the molten steel after tapping are as follows: C 0.07%, Si 0.25%, Mn 1.30%, P0.015%, S 0.010%, Nb+Ti+V 0.050%, Als 0.025%, and the rest It is iron and unavoidable impurities; the molten steel is continuously cast to obtain a slab, in which the molten steel in the tundish is 30t and the liquid level is 560mm when the tundish in the first continuous casting furnace is opened; the molten steel in the tundish is 18t when the tundish is changed quickly , The liquid level is 380mm; during normal pouring, the molten st...
Embodiment 3
[0056] 1) After the composition is designed, the molten iron is pretreated, then the converter is smelted, nitrogen and argon are switched, and the molten steel is obtained from the tapping; one additional blow before tapping, the tapping time is 8.0min; the alloy is added before 4 / 5 tapping; Double-stop slag for tapping, the thickness of the slag at the station is 30mm; the processing time of the argon station is 30min;
[0057] 2) The weight percentages of the components of the molten steel after tapping are as follows: C 0.08%, Si 0.30%, Mn 1.40%, P0.020%, S 0.015%, Nb+Ti+V 0.060%, Als 0.030%, and the rest It is iron and inevitable impurities; the molten steel is continuously cast to obtain slabs, in which the molten steel volume of the tundish is 28t when the tundish in the first continuous casting furnace is opened, and the liquid level is 580mm; , The liquid level is 400mm; during normal pouring, the molten steel in the tundish is 50t and the liquid level is 1000mm. When th...
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