Continuous casting method for controlling center carbon segregation of small high-carbon hard-wire steel square billet

A billet and carbon segregation technology, which is applied in the field of continuous casting to control carbon segregation in the center of billets of high-carbon hard wire steel, can solve the problems of large drawing damage and drawing fracture, and achieve the suppression of center segregation and center segregation. Improved, simple process effect

Inactive Publication Date: 2015-12-09
HEBEI IRON AND STEEL
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Central carbon segregation often causes central network cementite in the drawing process of hard wire rod, which is extremely harmful to drawing and often causes drawing fracture

Method used

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  • Continuous casting method for controlling center carbon segregation of small high-carbon hard-wire steel square billet

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Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: The specific process of the continuous casting method for controlling carbon segregation in the center of a high-carbon hard-wire steel billet is as follows.

[0014] The steel type is No. 65 hard wire steel, which is smelted in a 120t converter and continuously cast after LF refining. The process parameters of continuous casting are: the superheat of molten steel is 20°C; the current of electromagnetic stirring in the crystallizer is 350A, and the frequency is 3.0Hz; The secondary cooling adopts air mist cooling, the specific water volume is 0.60L / kg; the casting speed is 1.5m / min.

[0015] The carbon segregation and low-magnification detection results of the high-carbon hard-wire steel slab obtained in this embodiment are shown in Table 1.

Embodiment 2

[0016] Embodiment 2: The specific process of this continuous casting method is as follows.

[0017] The steel type is No. 55 hard wire steel, which is smelted in a 120t converter and continuously cast after LF refining. The process parameters of continuous casting are: the superheat of molten steel is 29°C; the current of electromagnetic stirring in the crystallizer is 320A, and the frequency is 3.0Hz; The secondary cooling adopts air mist cooling, the specific water volume is 0.65L / kg; the casting speed is 1.6m / min.

[0018] The carbon segregation and low-magnification detection results of the high-carbon hard-wire steel slab obtained in this embodiment are shown in Table 1.

Embodiment 3

[0019] Embodiment 3: The specific process of this continuous casting method is as follows.

[0020] The steel type is No. 65 hard wire steel, which is smelted in a 120t converter and continuously cast after LF refining. The process parameters of continuous casting are: the superheat of molten steel is 33°C; the current of electromagnetic stirring in the crystallizer is 350A, and the frequency is 4.0Hz; The secondary cooling adopts air mist cooling, the specific water volume is 0.65L / kg; the casting speed is 1.65m / min.

[0021] The carbon segregation and low-magnification detection results of the high-carbon hard-wire steel slab obtained in this embodiment are shown in Table 1.

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Abstract

The invention discloses a continuous casting method for controlling center carbon segregation of a small high-carbon hard-wire steel square billet. Crystallizer electromagnetic stirring is adopted in the method. According to the process of the method, the superheat degree of molten steel ranges from 10 DEG C to 35 DEG C, the current of crystallizer electromagnetic stirring ranges from 320 A to 350 A, and the frequency ranges from 3 Hz to 4 Hz; aerial fog cooling is adopted for secondary cooling and the specific water flow ranges from 0.5 L / kg to 0.7 L / kg; and the casting speed ranges from 1.5 m / min to 1.7 m / min. By the adoption of the method, process parameters in the continuous casting process are reasonably adjusted and optimized, the center segregation of the high-carbon hard-wire steel small square billet is obviously improved, a cast blank is sampled for detection, a carbon segregation coefficient KC is controlled between 0.95 and 1.05, and therefore it can be guaranteed that the accidents, caused by center segregation, of net-shaped cementite appearing and breaking are not generated in the following rolling process of the steel billet. Under the conditions that tail-end electromagnetic stirring and soft press are not available, the proper parameters are selected for reasonable adjustment so as to control the continuous casting process, the cast blank defects of center segregation and the like of the small square billet are overcome, and the continuous casting method has the beneficial effects of being simple in process and effective.

Description

technical field [0001] The invention relates to a continuous casting method, in particular to a continuous casting method for controlling carbon segregation in the center of a billet of high-carbon hard wire steel. Background technique [0002] High-carbon steel wire rod (generally refers to steel with a C content greater than 0.45%) is mainly used in steel wire ropes, packaging lines, etc., and is usually produced from billets. According to the different continuous casting machines, it can be further divided into the two-fire forming process of "bloom continuous casting-billet opening-hot rolling" and the one-fire forming process of "billet-hot rolling". The cost per ton of steel is 200-300 yuan lower than that of two-fired products. Therefore, the production of high-carbon hard wire steel by billet continuous casting is an effective means to reduce production costs. [0003] Due to the high carbon content in high carbon hard wire steel, central carbon segregation has beco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D11/00
Inventor 董廷亮张守伟常金宝肖国华刘宏强徐斌李杰张飞李双江
Owner HEBEI IRON AND STEEL
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