Method for producing hot rolled steel coils for ship building
A production method and technology of hot-rolled steel coils, applied in the field of hot-rolled steel coil preparation, can solve the problems of large strength margin and low plasticity of hot-rolled steel coils, achieve good surface quality, reduce production costs, and improve welding performance Effect
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Embodiment 1
[0049] 1) After the composition is designed, the molten iron is pretreated, then smelted in a converter, nitrogen and argon are switched, and the molten steel is obtained after tapping; the supplementary blowing is performed once before tapping, and the tapping time is 4.5 minutes; the alloy is added before tapping 4 / 5; Tapping double slag blocking, the slag thickness at the arrival station is 80mm; the whole process of argon blowing at the argon station takes 17 minutes;
[0050] 2) The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.05%, Si 0.12%, Mn 0.40%, P 0.010%, S 0.010%, Als 0.035%, and the rest are iron and unavoidable impurities; The molten steel is continuously cast to obtain a slab, wherein the molten steel volume of the tundish is 25t and the liquid level is 550mm when the tundish is poured in the first continuous casting furnace; the molten steel volume is 15t and the liquid level is 350mm when the tundish...
Embodiment 2
[0054]1) After the composition is designed, the molten iron is pretreated, then smelted in the converter, nitrogen and argon are switched, and the molten steel is obtained from tapping; 0 times of supplementary blowing before tapping, and the tapping time is 6.0min; the alloy is added before tapping 4 / 5; Tapping double slag blocking, the slag thickness at the arrival station is 60mm; the argon blowing station in the LF furnace takes 25 minutes to process the whole process of argon blowing;
[0055] 2) The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.07%, Si 0.17%, Mn 0.50%, P 0.015%, S 0.015%, Als 0.025%, and the rest are iron and unavoidable impurities; The molten steel is continuously cast to obtain a slab, wherein the tundish molten steel volume is 30t and the liquid level is 560mm when the tundish is poured in the first continuous casting furnace; the tundish molten steel volume is 18t and the liquid level is 380...
Embodiment 3
[0059] 1) After the composition is designed, the molten iron is pretreated, then smelted in the converter, nitrogen and argon are switched, and the molten steel is obtained after tapping; the supplementary blowing is performed once before tapping, and the tapping time is 8.0min; the alloy is added before tapping 4 / 5; Tapping double slag blocking, the slag thickness at the arrival station is 30mm; the whole process of argon blowing at the argon station is 30min;
[0060] 2) The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.08%, Si 0.24%, Mn 0.60%, P 0.020%, S 0.020%, Als 0.015%, and the rest are iron and unavoidable impurities; The molten steel is continuously cast to obtain a slab, wherein the tundish molten steel volume is 28t and the liquid level is 580mm when the tundish is poured in the first continuous casting furnace; the tundish molten steel volume is 20t and the liquid level is 400mm when the tundish is quickl...
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Abstract
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