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A low-carbon low-alloy steel pouring stopper rod and steelmaking process using the stopper rod

A technology of low-alloy steel and process, which is applied in the field of low-carbon low-alloy steel process and low-carbon low-alloy steel pouring stopper, which can solve the problems of stopper head erosion, uncontrollable flow, unsatisfactory deoxidation effect of molten steel, etc.

Active Publication Date: 2021-09-10
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the low content of C and alloy elements in SAE series steel grades, the deoxidation effect of molten steel is not ideal. The T.O content of molten steel smelted by this process is mostly 40-80ppm. In about 3 furnaces, the cork head was severely eroded and the flow could not be controlled, so the pouring was forced to stop

Method used

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  • A low-carbon low-alloy steel pouring stopper rod and steelmaking process using the stopper rod
  • A low-carbon low-alloy steel pouring stopper rod and steelmaking process using the stopper rod
  • A low-carbon low-alloy steel pouring stopper rod and steelmaking process using the stopper rod

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Embodiment

[0027] A stopper head used for pouring low-carbon and low-alloy steel and its application process provided by this invention are produced on a low-carbon and low-alloy steel production line in a steel factory, and the production process is as follows.

[0028](1) Add low-carbon ferrosilicon, low-carbon manganese, ferrochrome and carbon powder for deoxidation alloying when tapping the converter, and add lime, lightly burned magnesium balls, and synthetic slag to make slag at the same time, and add to the slag surface of the ladle after tapping Calcium carbide. The amount added is shown in Table 1 below. The composition of the synthetic slag is shown in Table 2. The bottom blowing control is shown in Table 3.

[0029] Table 1 Addition of raw and auxiliary materials for converter tapping

[0030] furnace number Lime, kg / t Lightly burned magnesium balls, kg / t Synthetic slag, kg / t Calcium carbide, kg / t a 5 0.5 2 1.0 b 4 1.1 1.4 0.3 c 3 1.5 ...

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Abstract

The application discloses a stopper rod for casting low-carbon and low-alloy steel and a steelmaking process using the stopper rod. The chemical composition of the head of the stopper rod satisfies: MgO≥70%, Al 2 o 3 : 5‑10%, SiO 2 ≤5%; SiC: 3‑5%, C≤10%. This application improves the composition and physical and chemical properties of the head of the stopper used in the casting process of low-carbon and low-alloy steel, combined with the optimization of the deoxidation alloying and slagging process in the molten steel metallurgy process, reduces the oxidation of molten steel, and improves the corrosion resistance of the stopper head. Comprehensively improve the pouring time of low-carbon and low-alloy steel, stabilize the flow control effect of the bag during the pouring process, and improve the quality of the billet.

Description

technical field [0001] The application relates to the technical field of molten steel refining and desulfurization outside the furnace, in particular to a stopper rod for pouring low-carbon and low-alloy steel and a low-carbon and low-alloy steel process using the stopper. Background technique [0002] In the prior art, the SAE series low-carbon low-alloy steel production process is KR-BOF-LF-(VD)-CC, and the current status of molten steel smelting and pouring is as follows: 1) The KR station performs deep desulfurization treatment on the molten iron. Remove hot metal desulfurization slag. 2) Decarburization, dephosphorization and temperature control in the converter treatment process, the C content of the converter tapping is 0.03-0.08%, the [O] content is 0.035-0.085%, the temperature is ≥ 1630°C, the oxygen content of the molten steel at the end of the converter is high, and the converter tapping There will be less slag in the process, resulting in higher oxygen potentia...

Claims

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Application Information

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IPC IPC(8): B22D41/18C22C33/06C21C5/36C21C7/06C21C7/10C22C38/02C22C38/04C22C38/18
CPCB22D41/18C21C5/36C21C7/06C21C7/10C22C33/06C22C38/002C22C38/02C22C38/04C22C38/18Y02P10/20
Inventor 赵家七蔡小锋邹长东张连兵
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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