Method for producing hot rolled steel coils for ship building
A production method and hot-rolled steel coil technology, applied in the field of hot-rolled steel coil preparation, can solve the problems of poor material comprehensive performance, large strength margin, and low elongation, and achieve improved welding performance, simple method, and increased elongation Effect
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Embodiment 1
[0047] 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;
[0048] 2) The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.06%, Si 0.20%, Mn 0.90%, P0.010%, S 0.005%, Nb+Ti+V 0.040%, Als 0.020%, the rest Iron and unavoidable impurities; the molten steel is continuously cast to obtain a slab, wherein the molten steel in the tundish is 25t and the liquid level is 550mm when the tundish is opened in the first continuous casting furnace; the molten steel in the tundish is 15t when the tundish is quickly changed ,...
Embodiment 2
[0052] 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 station handles the whole process of blowing argon for 25 minutes;
[0053]2) The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.07%, Si 0.25%, Mn 1.0%, P 0.016%, S 0.010%, Nb+Ti+V 0.050%, Als 0.025%, the rest It is iron and unavoidable impurities; the molten steel is continuously cast to obtain a slab, wherein the amount of molten steel in the tundish is 30t and the liquid level is 560mm when the tundish is opened in the first furnace of continuous casting; the amount of molten steel in the tundish is 18t when the tundish is qu...
Embodiment 3
[0057] 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;
[0058] 2) The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.08%, Si 0.30%, Mn 1.10%, P0.021%, S 0.015%, Nb+Ti+V 0.060%, Als 0.030%, the rest Iron and unavoidable impurities; the molten steel is continuously cast to obtain a slab, wherein the molten steel in the tundish is 28t and the liquid level is 580mm when the tundish is opened in the first continuous casting furnace; the molten steel in the tundish is 20t when the tundish is quickly changed , the liquid...
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