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Method for producing ultra-low carbon steel on basis of flexible thin slab casting (FTSC)

A thin slab continuous casting and ultra-low carbon steel technology, applied in the field of smelting, can solve the problems of long production cycle, large temperature loss, high production cost, etc., achieve stable production process, solve clogging problem, and improve castability

Active Publication Date: 2016-04-06
HEBEI IRON AND STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first kind of process technology is very mature, its production process is stable, and the product performance is excellent, but the equipment investment is large, the production cycle is long, and the production cost is high.
In the second process, it is very difficult to precisely control the carbon and silicon in the molten steel, and after the molten steel is refined by LF, the increase of carbon and silicon in the molten steel is obvious, the product composition fluctuates greatly, the hit rate is low, and the performance is unstable.
For the ultra-low carbon steel produced by the third process, if calcium treatment is not performed in the RH treatment process, the pourability of molten steel is poor when pouring on thin slabs, resulting in blockage of nozzles, affecting multi-furnace continuous casting of thin slab continuous casting, which restricts Large-scale production of ultra-low carbon steel in thin slab process
Mass production practice proves that when casting ultra-low carbon steel with thin slabs, calcium treatment must be carried out on molten steel, and when producing ultra-low carbon steel, ladle top slag is highly oxidizable, calcium treatment is difficult to control, and the effect is not stable, and it is easy to control poorly. The long nozzle is blocked, resulting in unplanned watering stop, which seriously affects the stable production, and the duplex process has a long production cycle and large temperature loss, which greatly increases the production cost

Method used

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  • Method for producing ultra-low carbon steel on basis of flexible thin slab casting (FTSC)
  • Method for producing ultra-low carbon steel on basis of flexible thin slab casting (FTSC)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Desulfurization of molten iron: the ladle is sprayed with granular magnesium and then slag is removed, and the S of molten iron entering the furnace is ≤0.003%;

[0032] (2) Converter smelting:

[0033] a. Molten iron temperature 1350℃, S=0.003%, P=0.120%;

[0034] b. The blowing process takes dephosphorization as the main goal, requires the whole process of slag removal, and the furnace temperature rises steadily;

[0035] c. Final slag basicity is 3.85, molten steel composition (mass percentage) C: 0.05%, S: 0.010%, P: 0.008%; end point temperature: 1680°C, end point oxygen level: 700ppm;

[0036] d. Continuous and clean special RH refining ladle is used for tapping;

[0037] e. Use a slag blocking machine to block slag, the thickness of the lower slag is ≤50mm; the mass percentage of FeO in the final slag is 22%;

[0038] f. Tapping time is 5.8 minutes, and the steel flow is round.

[0039] g. The amount of high-carbon ferromanganese added is 1.0Kg / ton of ste...

Embodiment 2

[0053] (1) Desulfurization of molten iron: the ladle is sprayed with granular magnesium and then slag is removed, and the S of molten iron entering the furnace is ≤0.003%;

[0054] (2) Converter smelting:

[0055] a. Molten iron temperature 1350℃, S=0.003%, P=0.120%;

[0056] b. The blowing process takes dephosphorization as the main goal, requires the whole process of slag removal, and the furnace temperature rises steadily;

[0057] c. Final slag basicity is 3.5, molten steel composition (mass percentage) C: 0.06%, S: 0.009%, P: 0.010%; end point temperature: 1700°C, end point oxygen level: 800ppm;

[0058] d. Continuous and clean special RH refining ladle is used for tapping;

[0059] e. Use a slag blocking machine to block slag, the thickness of the lower slag is ≤50mm; the mass percentage of FeO in the final slag is 23%;

[0060] f. Tapping time is 6 minutes, and the steel flow is round.

[0061] g. The amount of high-carbon ferromanganese added is 1.1Kg / ton of steel;...

Embodiment 3

[0075] (1) Desulfurization of molten iron: the ladle is sprayed with granular magnesium and then slag is removed, and the S of molten iron entering the furnace is ≤0.003%;

[0076] (2) Converter smelting:

[0077] a. Molten iron temperature 1350℃, S=0.003%, P=0.120%;

[0078] b. The blowing process takes dephosphorization as the main goal, requires the whole process of slag removal, and the furnace temperature rises steadily;

[0079] c. Final slag basicity is 4.0, molten steel composition (mass percentage) C: 0.05%, S: 0.007%, P: 0.011%; end point temperature: 1720°C, end point oxygen level: 600ppm;

[0080] d. Continuous and clean special RH refining ladle is used for tapping;

[0081] e. Use a slag blocking machine to block slag, the thickness of the lower slag is ≤50mm; the mass percentage of FeO in the final slag is 28%;

[0082] f. Tapping time is 5 minutes, and the steel flow is round.

[0083] g. The amount of high-carbon ferromanganese added is 1.05Kg / ton of steel...

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Abstract

The invention discloses a method for producing ultra-low carbon steel on the basis of flexible thin slab casting (FTSC). The method includes the following steps of (1) molten iron desulfurization, (2) smelting with a converter, (3) Ruhstahl Hausen (RH) vacuum treatment and (4) FTSC. The ultra-low carbon steel comprises, by mass, 0-0.010% of C, 0.06%-0.35% of Mn, 0.12%-0.28% of Si, 0-0.020% of P, 0-0.020% of S, 0-0.09% of Ti, 0-0.0050% of N, and the balance iron and inevitable impurities. According to the method, the ultra-low carbon steel is produced through FTSC, the components, suitable for FTSC production, of the ultra-low carbon steel are redesigned, and ultra-low carbon steel continuous casting slabs meeting the performance requirement are produced by strictly controlling process parameters of all procedures of steel making.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for producing ultra-low carbon steel based on FTSC thin slab continuous casting. Background technique [0002] Ultra-low carbon steel is mainly used in structural parts with deep drawing requirements, such as automotive structural parts with complex structural shapes and other components with complex structures. All these structural parts are generally delivered after pickling cold rolling, annealing or continuous annealing galvanizing. They have a wide range of applications and require high elongation, high n value and r value. [0003] At present, the production of ultra-low carbon steel mainly has the following three production processes. The first type: blast furnace→hot metal desulfurization→top-bottom combined blowing converter→RH vacuum→conventional slab (slab thickness≥200mm) continuous casting; the second type: blast furnace→hot metal desulfurization→converter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/14C21C7/00
Inventor 李梦英张洪波王兰玉田欣杨晓江王峰张大勇杨杰郝占全付建军张军国李京哲佟志新冯慧霄李波刘广涛
Owner HEBEI IRON AND STEEL
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