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High-cleanliness low-carbon steel converter molten steel direct-up steel casting method

A high-cleanliness, low-carbon steel technology, applied in the manufacture of converters, etc., can solve the problems of long production cycle, high cost, easy flocculation, etc., to improve quality stability, improve the cleanliness of molten steel, and control the content of inclusions Effect

Pending Publication Date: 2021-11-09
TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Three-step method: Converter-LF refining-continuous casting process is adopted. Deoxidation generally adopts the production mode of precipitation deoxidation (aluminum deoxidation) and diffusion deoxidation (slag deoxidation), which has long production cycle and high cost. Power supply, there is a case of secondary oxidation
[0004] Two-step method: use converter to produce low-carbon steel straight up continuous casting steel casting process, the production process is converter-continuous casting process, the main control method is aluminum, silicon alloy or composite deoxidation, it is difficult to control the inclusions of molten steel produced by converter, The process of continuous casting and pouring of steel is easy to flocculate, the cleanliness of molten steel is low, the stability of the production process is insufficient, and the rating of inclusions in continuous casting slab products exceeds the standard seriously

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present invention has a high-purity low carbon steel converter steel, a straight pouring steel method, including the following steps:

[0025] S1, preparing 80 tons / furnace steel, 40 tons / furnace steel, scrap steel, scrap ratio of 33.3%; iron water conditions, temperature 1275 ° C, iron water components C: 4.1%, Si: 0.35%, Mn: 0.28%, P: 0.095%, S: 0.035%;

[0026] S2, due to the iron water Si 92%, P 2 O <1%, particle size is 10-20mm, spherical, 10kg bag packaging; silicon carbide regulatory agent is close to the iron bag position in the blast furnace, adding iron water in the iron water process (1 / 3 ~ 2 / 3) The heat promotes stirring, and the iron water Si is adjusted to 0.50% of the target;

[0027] S3, scrap ratio is: 2 tons of finished steel particles, 2 tons of heavy waste blocks are added to the iron bag before iron, using iron water heat melting scrap, reducing the molten steel pressure of the converter smelting process; thickness> 0.8mm The fragmentation mate...

Embodiment 2

[0036] S1, preparing 82 tons / furnace steel, scrap 38 ton / furnace steel, scrap ratio of 31.7 wt%; iron water temperature is: 1300 ° C, iron water ingredient C: 4.2%, Si: 0.55%, Mn: 0.30%, P: 0.097%, S: 0.032%;

[0037] S2, since the iron water Si is in the target range, no silicon carbide regulating agent;

[0038] S3, the scrap ratio is: 1.9 tons of steel particles, 1.9 tons of heavy waste blocks are added to the iron bag before iron, using iron water heat, molten the scrap steel, reduce the molten scrap pressure of the converter; thickness> 0.8mm level The broken fragmentation is 3.8 ton. When iron is transported to the iron water bag after iron, it is covered to the surface of the iron water, reducing temperature loss, reducing the iron water temperature fluctuation of entering the converter; other types of steel bar blocks 30.4 tons, add converting ;

[0039] S4, converter blowing process, 27000-29000m of oxygen supply 3 / h, oxygen pressure 0.80-1.00MPa; oxygen pressure bi...

Embodiment 3

[0047] S1, iron water 85 tons / furnace steel, scrap 35 tons / furnace steel, scrap ratio of 29.2%; iron water conditions, temperature 1300 ° C, iron water components C: 4.4%, Si: 0.48%, MN: 0.30%, p: 0.087 %, S: 0.028%;

[0048] S2, due to iron Si 92%, P 2 O <1%, particle size is 10-20mm, spherical, 10kg bag packaging; silicon carbide regulatory agent is close to the iron bag position in the blast furnace, adding iron water in the iron water process (1 / 3 ~ 2 / 3) The heat promotes stirring, and the iron water Si is adjusted to 0.50% of the target;

[0049] S3, scrap ratio is: 1.75 tons of finished steel granules, 1.75 tons of heavy waste blocks are added to the iron bag before iron, using iron water heat to melt the scrap, mitigate the pressure of the converter smelting process; thickness> 0.8mm The fragmentation material is 3.5 tons. After ironing, the belt is transported to the iron water package, covering the surface of the iron water, reducing temperature loss, reducing the ir...

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Abstract

The invention belongs to the technical field of converter steelmaking, and particularly relates to a high-cleanliness low-carbon steel converter molten steel direct-up steel casting method. The method comprises the following steps: the proportion of molten iron and scrap steel is adjusted; the silicon component of the molten iron is finely adjusted before converter smelting, so that the content of Si reaches 0.50 wt%; the oxygen supply flow is 27000 to 29000 m < 3 > / h, and the oxygen pressure is 0.80 to 1.00 Mpa; liquid carbon-based metal is combined with double vent plugs for bottom blowing deoxidation; after tapping is finished, hot-state refining slag is added into a steel ladle for slagging; after the hot-state refining slag is added into a converter, all steel ladle vent plugs are opened; and after blowing and stirring of the converter are finished, steel casting is conducted through direct-up continuous casting. Compared with a traditional three-step smelting technology of refining treatment, the refining treatment period is eliminated, the cost is greatly reduced, the content of inclusions is effectively controlled, the cleanliness of molten steel is greatly improved, and the quality stability of low-carbon steel direct-up steel casting is improved.

Description

Technical field [0001] The present invention belongs to the field of converter steelmaking, and in particular, the present invention relates to a high-purity low carbon steel converter steel. Background technique [0002] Low carbon steel is low in its carbon content, conventional control is in W (C): 0.08% or less, the fiber is high in the end of the converter, the inclusion content is high, so cleanliness control is a key point of product quality control. At present, the main three-step method and two-step method are used. [0003] Three-step method: using converter -LF refining-continuous casting process, deoxidation generally uses precipitation deoxidation (aluminum deoxidation) and diffusion deoxidation (slag deoxidation), there is long production cycle, high cost, and during LF refining For the case of precipitation, there is a secondary oxidation. [0004] Step 2: The converter produces low-carbon steel straight in the cast steel process, the production process is the conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C21C5/35C21C7/00C21C7/06
CPCC22C33/06C22C38/02C22C38/04C21C7/06C21C7/00C21C7/0006C21C5/35
Inventor 李亚志崔猛聂荣恩董冠求幺旭林
Owner TIANJIN TIANGANG UNITED SPECIAL STEEL CO LTD
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