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A method for smelting silicon-killed steel used in fixed-size casting aluminum-containing ladles

A technology for silicon-killed steel and a smelting method, applied in the field of continuous casting of iron and steel metallurgy, can solve the problems of easy cracking in the quality of rolling material, increased risk of cracks, unstable performance, etc. Normal, the effect of improving production efficiency

Active Publication Date: 2020-09-18
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The use of mixed ladles, ladle number: No. 5 / 34 times, furnace number: H172-3478, steel type: SPHC-1, composition: C% 0.05, Si% 0.02, Mn% 0.14, P% 0.018, S% 0.008, Alt% 0.045;

[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, calcified high calcium line 70 meters, soft blowing time 13min; continuous casting machine 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 slag basicity at the end point is 2.43, the casting casting speed of the continuous casting machine is 0.98m / min, and the quality of casting slab and rolling material is normal; the ladle of this prod...

Embodiment 2

[0036] The use of mixed ladles, ladle number: No. 8 / 26 times, furnace number: H172-3478, steel type: Q345B1, composition: C% 0.14, Si% 0.20, Mn% 0.65, P% 0.021, S% 0.009, Alt% 0.018;

[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 the converter: 800kg, deoxidizer 2.0kg / ton; refine and stir for 3.5min, argon pressure 0.8Mpa, add lime 200kg, fluorite 100kg, calcification high 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 p...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111C21C5/28C21C5/36C21C7/00C21C7/06C22C33/04C22C38/02C22C38/04C22C38/06
CPCB22D11/111C21C5/28C21C5/36C21C7/0006C21C7/06C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 邹春锋
Owner SHANDONG IRON & STEEL CO LTD
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