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Silicon killed steel smelting method used for fixed-diameter type casting aluminum-containing steel ladle
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A silicon-killed steel and smelting method technology, applied in the field of iron and steel metallurgical continuous casting, can solve the problems of easy cracks in the quality of rolled products, increased risk of cracks, and unstable performance, so as to prolong the time for removing inclusions and improve the quality of slabs Normal, productivity-enhancing effects
Active Publication Date: 2018-11-23
SHANDONG IRON & STEEL CO LTD
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Problems solved by technology
Abnormal fluctuations in casting speed increase the risk of cracks in the slab, and the quality of rolled products is prone to cracks, unstable performance and other product defects. It is difficult to adapt to the process requirements under the high-volume production mode
Method used
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[0033] The use of silicon-killed steel, ladle number: No. 5 / 35 times, furnace number H171-2860, steel type: Q235B-1, composition: C% 0.16, Si% 0.16, Mn% 0.43, P% 0.016, S% 0.005, Alt% 0.006; add synthetic slag to converter: 800kg, deoxidizer 2.0kg / ton; refine and stir for 4 minutes, argon pressure 0.9Mpa, add lime 250kg, fluorite 120kg, calcificationhigh calcium line 70 meters, soft blowing time 13min; continuous castingmachine ladle argon seal flow rate 120L / min, slider 17.5 / 18mm.
[0034] Adopting the smelting process method of the present invention, the refining slag white slag time is 20min, the final slag basicity is 2.43, the casting casting speed of the continuous casting machine is 0.98m / min, and the quality of casting slab and rolled material is normal; the production line uses 1 les...
[0037]The use of silicon-killed steel, ladle number: No. 8 / 27 times, furnace number H171-2860, steel type: Q235B-1, composition: C% 0.17, Si% 0.18, Mn% 0.45, P% 0.019, S% 0.004, Alt% 0.005; add synthetic slag to converter: 800kg, deoxidizer 2.0kg / ton; refine and stir for 3.5min, argon pressure 0.8Mpa, add lime 200kg, fluorite 100kg, calcificationhigh calcium line 50m, soft blow The time is 12 minutes; the continuous casting machine ladle argon sealing flow rate is 110L / min, and the slider is 17.5 / 18mm.
[0038] Adopting the smelting process method of the present invention, the refining slag white slag time is 23min, the final slag basicity is 2.38, the casting casting speed of the continuous casting machine is 0.97m / min, and the quality of casting slab and rolling material is normal; the produ...
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Abstract
The invention discloses a silicon killed steel smelting method used for a fixed-diameter type casting aluminum-containing steel ladle. The method comprises the steps that firstly, according to characteristics of aluminium steel and aluminium residues in an aluminum-containing steel ladle, aluminium molten into molten steel is preferably oxidized, and the aluminium content in the molten steel is reduced; secondly, the capacity of the furnace slag for absorbing included matters is improved; thirdly, the included matters are subjected to denatured treatment, and the included matter removing timeis prolonged; and fourthly, a full protection mode and a relative large sliding block manner are adopted for stable casting. According to the silicon killed steel smelting method, the steelmaking converter, refining and continuous casting key technology is optimized and improved, when the fixed-diameter type casting aluminum-containing steel ladle is used, the molten steel ingredient, the molten steel quality and normal casting of silicon killed steel casting are guaranteed, meanwhile, stable and efficient running of multiple production lines and multiple steel type technologies are guaranteed.
Description
technical field [0001] The invention belongs to the field of continuous casting of iron and steel metallurgy, and in particular relates to a method for smelting silicon-killed steel used in sizing casting aluminum-containing ladles. Background technique [0002] With the continuous expansion of demand for steel products at home and abroad, steel products are showing a development direction of wider use, more detailed orders, more complex smelting processes, and higher performance indicators. The means have realized the diversity of products, which can basically meet the urgent needs of diversified markets. However, in the case of industrial production in the steel industry, due to the influence of miscellaneous steel types and process differences in the production schedule, special ladle lines for molten steel containers are required, which will inevitably cause more ladles to be invested in the smelting process to meet production needs, resulting in greater waste. [0003]...
Claims
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