Nitrogen control technology for stranded wire steel series steel grade

A process and a series of technologies, which are applied in the field of nitrogen control process of stranded steel series steel, can solve the problems of grain boundary strength weakening, precipitation influence, reduction of steel toughness and welding performance, etc., to reduce nitrogen content and inhibit nitrogen increase phenomenon , the effect of eliminating the chance of contact

Inactive Publication Date: 2018-11-30
BENGANG STEEL PLATES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the steelmaking process, low-calcium ferrosilicon→silicon-manganese alloy→steelmaking recarburizer is used for alloying. TiN is formed when molten steel solidifies, but since the strand steel does not use aluminum deoxidation, the nitrogen content in the steel has a great influence on the precipitation of TiN. big impact
The higher the nitrogen content, the more TiN will be precipitated, which will weaken the grain boundary strength, change the brittle zone of the steel, and easily produce cracks on the surface of the slab, which will reduce the toughness and welding performance of the steel. The requirements are higher, but the production process of strand steel leads to more nitrogen (nitrogen absorption) points in the production process, so a production process is needed to effectively solve the problem in the converter smelting process, as well as the subsequent tapping process and refining process. , Nitrogen increase (nitrogen absorption) phenomenon in the continuous casting process

Method used

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  • Nitrogen control technology for stranded wire steel series steel grade
  • Nitrogen control technology for stranded wire steel series steel grade

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Effect test

Embodiment 1

[0026] Adopt the nitrogen control process concrete steps of the present invention to comprise:

[0027] 1. Use scrap steel, alloy and other auxiliary materials with nitrogen content not exceeding 40ppm for smelting;

[0028] 2. The air permeability and cleanliness of the steel ladle must be checked before tapping. Argon gas is passed into the ladle for 2 minutes before tapping, and the flow rate of argon gas is 70m 3 / h, blowing argon for 4 minutes during the tapping process, blowing argon for 5 minutes in the argon station, and argon flow at 20m 3 / h; the tapping time is 5 minutes, and at the same time, clean the residual steel hanging outside the tapping hole in time to prevent the steel from dispersing; the ladle car is driven below the furnace mouth so that the furnace cover is tightly covered on the ladle to ensure the pressure inside the ladle Greater than atmospheric pressure, argon flow is controlled at 28m 3 / h, after the ladle top slag breaks, adjust the argon flow...

Embodiment 2

[0036] Adopt nitrogen control process concrete steps of the present invention as follows:

[0037] 1. Use scrap steel, alloy and other auxiliary materials with nitrogen content not exceeding 40ppm for smelting;

[0038] 2. Before tapping, the air permeability and cleanliness of the ladle must be checked. Argon gas is passed into the ladle for 3 minutes before tapping, and the flow rate of argon gas is 80m 3 / h, blowing argon for 7 minutes during the tapping process, blowing argon for 8 minutes at the argon station, and controlling the flow of argon at 40m 3 / h; the tapping time is 7 minutes, and at the same time, clean the residual steel hanging outside the tapping port in time to prevent the tapping from dispersing; the ladle car is driven below the furnace mouth so that the furnace cover is tightly covered on the ladle to ensure the pressure inside the ladle Greater than atmospheric pressure, argon flow is controlled at 15m 3 / h, after the ladle top slag breaks, adjust the...

Embodiment 3

[0048] Adopt nitrogen control process concrete steps of the present invention as follows:

[0049] 1. Use scrap steel, alloy and other auxiliary materials with nitrogen content not exceeding 40ppm for smelting;

[0050] 2. The air permeability and cleanliness of the steel ladle must be checked before tapping. Argon gas is passed into the ladle for 2 minutes before tapping, and the flow rate of argon gas is 65m 3 / h, blowing argon for 6 minutes during the tapping process, blowing argon for 7 minutes in the argon station, and argon flow at 30m 3 / h; the tapping time is 6 minutes, and at the same time, clean the residual steel hanging outside the tapping port in time to prevent the tapping from scattering; the ladle car is driven below the furnace mouth so that the furnace cover is tightly covered on the ladle to ensure the pressure inside the ladle Greater than atmospheric pressure, argon flow is controlled at 28m 3 / h, after the ladle top slag breaks, adjust the argon flow rate...

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Abstract

The invention provides a nitrogen control technology for a stranded wire steel series steel grade. The technology comprises the working procedures of selection of low-nitrogen accessories for smelting, LF furnace port positive pressure operation, LF submerged arc refining, continues casting protection casting and steelmaking full-process argon blowing, and the nitrogen content in steel is controlled to be 60ppm or below; and the nitrogen content in the accessories does not exceed 40ppm. The nitrogen increasing phenomenon in the smelting process is effectively restrained, the TiN content in thesteel is sharply decreased, and therefore production of the low-nitrogen steel grade with the nitrogen content being 60ppm or below is achieved.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a nitrogen control process for strand steel series steel grades. Background technique [0002] Nitrogen has an important impact on the performance of metals. With the development of metal materials and the increasingly stringent requirements of users on processing performance and quality, it is necessary to further reduce the nitrogen content in steel to ensure that the product quality is competitive in the market. [0003] Stranded wire series steel is mainly used for drawing wire, which requires high strength and good toughness. In the steelmaking process, low-calcium ferrosilicon→silicon-manganese alloy→steelmaking recarburizer is used for alloying. TiN is formed when molten steel solidifies, but since the strand steel does not use aluminum deoxidation, the nitrogen content in the steel has a great influence on the precipitation of TiN. big impact. The higher the nitrogen conte...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/072C21C7/076B22D11/117B22D11/111B22D11/10
CPCB22D11/10B22D11/111B22D11/117C21C7/00C21C7/072C21C7/076Y02P10/20
Inventor 王健刘真海
Owner BENGANG STEEL PLATES
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