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Production process of aluminium-containing steel

A production process and technology for aluminum steel, applied in the field of refining and continuous casting processes, can solve problems such as blockage of tundish nozzles, reduction of molten steel yield, and fluctuation of liquid level in molds, saving consumption and production costs, and improving internal quality. , the effect of accelerated production rhythm

Inactive Publication Date: 2005-09-14
NANJING NANGANG IND DEV CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Production practice over the years has shown that when the aluminum content in the steel is greater than 0.006%, the castability is poor, resulting in blockage of the ladle nozzle and tundish nozzle (also called necking, variable flow), crystallizer liquid level fluctuations and other abnormal operations, disrupting The normal production rhythm of the steelmaking plant affects the surface quality and internal quality of the slab, and at the same time the yield of molten steel decreases, especially 130 2 、150 2 It is difficult to develop and test aluminum-containing steel types for billets with small cross-sections
[0004] At present, billet continuous casting is a steel type with high aluminum content, and there is no mature process at home and abroad. Due to the small diameter of the billet continuous casting nozzle, the Al suspended in molten steel 2 o 3 The high interface energy of the particles in contact with molten steel enables it to adhere to the surface of the refractory material, sinter each other and form a network of Al 2 o 3 , easy to deposit near the nozzle and block the nozzle

Method used

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Examples

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Effect test

Embodiment 1

[0025] Embodiment 1 adopts 100 tons of ultra-high power AC electric arc furnaces to produce CM690 steel grades, and its production process is as follows:

[0026] About 100 tons of steelmaking raw materials such as molten iron and scrap steel were poured into the electric furnace in three batches to start smelting. During the smelting process of the electric furnace, the oxygen supply system adopted is that four furnace wall oxygen lances are used to supply oxygen at the same time during the melting period of the electric furnace smelting, that is, two Module oxygen lances, one EBT eccentric area oxygen lance, and one 4# small oxygen lance Gun, the oxygen flow rate is 40m respectively 3 / min, 40m 3 / min, 10m 3 / min, 15m 3 / min; in the melting to melting stage of smelting, first turn off the oxygen lance in the EBT eccentric area, then turn off one of the Module oxygen lances, and turn on the EBT lance 3-5 minutes before tapping, and the three oxygen lances supply oxygen at ...

Embodiment 2

[0027] Embodiment 2 adopts 100 tons of ultra-high power AC electric arc furnaces to produce 20CrMnTi steel grades, and its production process is as follows:

[0028] About 100 tons of steelmaking raw materials such as molten iron and scrap steel were poured into the electric furnace in three batches to start smelting. During the smelting process of the electric furnace, the oxygen supply system adopted is that four furnace wall oxygen lances are used to supply oxygen at the same time during the melting period of the electric furnace smelting, that is, two Module oxygen lances, one EBT eccentric area oxygen lance, and one 4# small oxygen lance Gun, the oxygen flow rate is 40m respectively 3 / min, 40m 3 / min, 10m 3 / min, 15m 3 / min; in the melting to melting stage of smelting, first turn off the oxygen lance in the EBT eccentric area, then turn off one of the Module oxygen lances, and turn on the EBT lance 3-5 minutes before tapping, and the three oxygen lances supply oxygen at...

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Abstract

The production process of aluminium-containing steel whose aluminium content is greater than or equal to 0.020%, including refining and continuosly-casting processes, relates to the field of metal smelting technology. It mainly includes the technological steps: electric furnace EAF smelting, LF furnace smelting, deoxygenation and continuously-casting, and adopts the measures of seriously controlling smelting time, molten steel temp., supplying oxygen, adding aluminium, blowing argon and slagging, etc. to obtain the aluminium-containing steel.

Description

1. Technical field [0001] The invention relates to a production process of aluminum-containing steel grades, in particular to a refining and continuous casting process for producing steel grades with an aluminum content ≥ 0.020 percent by smelting on an electric furnace, and relates to the technical field of metal smelting in the metallurgical industry. 2. Background technology [0002] The basic production process route of traditional aluminum-containing steel is: converter (electric furnace)→secondary refining→degassing→continuous casting. [0003] Since aluminum is a metal element that has a significant impact on the final deoxidation of steel, grain size, inclusions and steel toughness, especially low-temperature impact toughness, high-quality steel and special steel mostly have strict requirements on aluminum content. Such as anchor chain steel for ships, the total aluminum content is required to be no less than 0.020%, and the pipeline steel and steel containing titani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C7/00C22C1/02C22C33/04C22C38/06
CPCY02P10/20
Inventor 林国强朱守欣吴惠荣孙华
Owner NANJING NANGANG IND DEV CO LTD
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