Control method of softness of oxide scales on surface of hot-rolling strip steel
A technology of surface oxidation and hot-rolled strip, applied in metal rolling, metal rolling, temperature control and other directions, can solve the problems of increasing equipment investment, natural cooling can not meet the requirements, etc., to reduce FeO broken, reduce thickness, improve The effect of adhesion
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[0043] Example 1
[0044] The molten steel is smelted and continuously cast into slabs, and its components are C 0.098%, Si 0.23%, Mn 1.26%, P0.016%, S0.002%, Al 0.032%, Nb 0.020%, V0.001%, Ti 0.003%, the balance is iron.
[0045] Heat the slab to 1220°C for 40 minutes. Then use high-pressure water for descaling, the descaling temperature is 1200°C, and the water pressure for descaling is 20MPa.
[0046] The slab after descaling was subjected to rough rolling, the opening temperature was 1150°C, the final rolling temperature was 1030°C, and the cumulative reduction was 78%.
[0047] The rough-rolled slab is descaled before finishing rolling, the descaling temperature is 1050℃, and the water pressure during the second descaling is at least 18MPa; then finishing rolling is carried out, the finishing rolling temperature is 1020℃, and the final rolling temperature is 870 ℃, the cumulative reduction of finishing rolling is 75%, the rolling speed during finishing rolling is 3.5m / s; and af...
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[0048] Example 2
[0049] The molten steel is smelted and continuously cast into slabs. The components are C 0.071%, Si 0.131%, Mn 1.485%, P0.006%, S0.003%, Al 0.044%, Nb 0.062%, V0.016% by weight. Ti 0.002%, the balance is iron.
[0050] Heat the slab to 1250°C for 40 minutes. , And then use high-pressure water for descaling, the descaling temperature is 1220℃, and the water pressure is 20MPa when descaling is required.
[0051] The slab after descaling is subjected to rough rolling, the opening temperature is 1180°C, the final rolling temperature is 1060°C, and the cumulative reduction is 85%.
[0052] The rough-rolled slab is subjected to finish rolling and then descaling. The descaling temperature is 1080°C, and the water pressure during descaling is at least 18MPa; then, finishing rolling is carried out. The finishing rolling temperature is 1040°C and the final rolling temperature is 880°C. The cumulative reduction of finishing rolling is 75%, and the rolling speed during finis...
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[0053] Example 3
[0054] The molten steel is smelted and continuously cast into slabs. The components are C 0.089%, Si 0.074%, Mn 1.282%, P0.007%, S0.002%, Al 0.041%, Nb 0.020%, Ti0.001%, The balance is iron.
[0055] Heat the slab to 1230℃, keep it for 30min, and then use high-pressure water for descaling. The descaling temperature is 1200℃, and the water pressure for descaling is 20-25MPa.
[0056] The slab after descaling was rough-rolled, the opening temperature was 1170°C, the final rolling temperature was 1080°C, and the cumulative reduction was 83%.
[0057] The rough-rolled slab is descaled before finishing rolling, the descaling temperature is 1100°C, and the water pressure during descaling is at least 18MPa; then finishing rolling is carried out, the finishing rolling temperature is 1070°C, and the final rolling temperature is 920°C. The cumulative reduction in finishing rolling is 95%, and the rolling speed during finishing rolling is 12m / s; and after finishing rolling, i...
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