A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process
A thin slab continuous casting and cold-rolling silicon steel technology, which is applied to the improvement of process efficiency, metal rolling, and tool manufacturing, can solve the problems of low casting slab yield, many process links, and large equipment investment, so as to reduce the process Links, save equipment investment, reduce the effect of equipment investment
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[0032] Example 1
[0033] Pour the molten iron from the blast furnace into the oxygen top-bottom composite converting converter, and at the same time add 10% of the total weight of scrap steel into the converter. During the blowing process, lime, dolomite and fluorite are added to the converter to make the final slag binary basicity R=2.8; the converter adopts the whole process of bottom blowing argon, and the bottom blowing argon intensity is ≥0.03Nm 3 / min.t 钢 . When the final composition of molten steel [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and the final temperature of molten steel is 1650℃, tapping with constant oxygen is required; when the converter is tapped, 1.2kg is added to the ladle first / t 钢液 Compound deoxidizer such as barium-silicon alloy and 1.8kg / t 钢液 The metal aluminum block initially deoxidizes the molten steel. After the first deoxidation of the molten steel, the dissolved oxygen content in the molten steel is 100ppm; then 2.5kg / t is added to the molten steel 钢液 Met...
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[0035] Example 2
[0036] The molten iron from the blast furnace is poured into the oxygen top-bottom composite converting converter, and at the same time, 20% of the total weight of scrap steel is poured into the converter. During the blowing process, add lime, dolomite, and fluorite to the converter to make the final slag binary basicity R=1.5; the converter adopts the whole process of bottom blowing argon, and the strength of bottom blowing argon is ≥0.03Nm 3 / min.t 钢 . When the final composition of molten steel [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and the final temperature of molten steel is 1680℃, constant oxygen tapping; 2.5kg is added to the ladle when the converter is tapped / t 钢液 Compound deoxidizer such as silicon-calcium alloy and 0.2kg / t 钢液 The metal aluminum block initially deoxidizes the molten steel. After the first deoxidation of the molten steel, the dissolved oxygen content in the molten steel is 225ppm; then 0.6kg / t is added to the molten steel 钢液 Metal manganese, ...
Example Embodiment
[0038] Example 3
[0039] Pour the molten iron from the blast furnace into the oxygen top-bottom composite converting converter, using all molten iron smelting, without adding scrap steel, and adding lime, dolomite, and fluorite to the converter during the converting process to make the final slag binary alkalinity R=4.0 ; The converter adopts the whole process of bottom argon blowing, and the intensity of bottom argon blowing ≥0.03Nm 3 / min.t 钢 . When the final composition of molten steel [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and the final temperature of molten steel is 1700℃, the steel is tapped with constant oxygen; 0.20kg is added to the ladle when the converter is tapped / t 钢液 Compound deoxidizer such as silicon-aluminum-calcium alloy and 3.5kg / t 钢液 The metal aluminum block performs the initial deoxidation of the molten steel. After the initial deoxidation of the molten steel, the dissolved oxygen content in the molten steel is 30ppm; then, 4.5kg / t is added to the molten steel 钢液...
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