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Low-carbon steel RH molten steel nitrogen control method and low-carbon steel continuous casting method

A low-carbon steel and molten steel technology, which is applied in the continuous casting of low-carbon steel and the nitrogen control field of low-carbon steel RH molten steel, can solve problems such as difficulty in meeting performance requirements, low product qualification rate, and fluctuations in N content in products.

Pending Publication Date: 2021-09-10
WUHU XINXING DUCTILE IRON PIPES
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Problems solved by technology

[0003] For the RH vacuum link, when most steel mills produce low-carbon steel, due to the high degree of vacuum, the carbon content of the converter is very low. It is difficult to control the RH vacuum when producing this type of steel. Only by extending the ultimate vacuum The retention time of the degree is often difficult to meet the performance requirements, which often causes fluctuations in the control of the N content of the product and a low pass rate of the product

Method used

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  • Low-carbon steel RH molten steel nitrogen control method and low-carbon steel continuous casting method

Examples

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Embodiment

[0032] The following steps are used for control in the RH vacuum stage:

[0033] (1) Arrange a furnace of HRB400 molten steel to wash the vacuum tank before the vacuum degassing of 10# steel;

[0034] (2) After the ladle trolley is driven to the processing station, temperature measurement, sampling and oxygen determination of molten steel are carried out;

[0035](3) The lifting gas of the RH furnace is set to argon, and the flow rate and the high vacuum time in the furnace are controlled according to Table 2;

[0036] (4) Add a certain amount of Fe to the ladle when vacuuming 2 o 3 agent;

[0037] (5) Feed a certain length of calcium wire and perform soft argon blowing for a certain period of time. The main components of the molten steel of each embodiment before entering the RH vacuum are shown in Table 1; the parameter settings of each embodiment during the RH vacuum process are shown in Table 2;

[0038] It can be seen from Table 3 that in Examples 1 and 2, after soft...

Embodiment 3

[0039] In Example 3, after soft argon blowing for 20 minutes, the content of N element in the measured molten steel composition is 0.0035%, which is higher than the target value. If the content of N element is controlled within the range of 0.002%-0.003%, it needs to be kept at Continuously carry out soft argon blowing under the condition of high vacuum, the total soft argon blowing time is 25min, and keeping high vacuum for a long time increases the difficulty of the process, and the stability of the process is lower than that of Examples 1 and 2. The defective rate becomes high.

[0040] Similarly, in Comparative Example 1, after soft argon blowing for 20 minutes, the content of N element in the measured molten steel composition is 0.0044%, which is higher than the target value. If the content of N element is controlled within the range of 0.002%-0.003%, It is also necessary to keep soft argon blowing under high vacuum conditions. After the total soft argon blowing time is 2...

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Abstract

The invention discloses a low-carbon steel RH molten steel nitrogen control method and a low-carbon steel continuous casting method. The low-carbon steel RH molten steel nitrogen control method comprises the step of performing RH vacuum degassing under the condition that Fe2O3 is added into molten steel, wherein the dosage of Fe2O3 is not less than 0.5kg relative to 1t of molten steel, and the RH vacuum degassing is performed under the conditions of soft argon blowing and furnace pressure not greater than 100Pa. The low-carbon steel RH molten steel nitrogen control method can reduce the vacuum degassing time and reduce the difficulty in controlling a nitrogen removal process, thereby reducing the defective rate and improving the qualification rate of products.

Description

technical field [0001] The invention relates to the field of low-carbon steel casting, in particular to a method for controlling nitrogen in low-carbon steel RH molten steel and a continuous casting method for low-carbon steel. Background technique [0002] Nitrogen is a harmful element in most special steel products. High nitrogen content in steel will cause stress failure of the steel, significantly reduce the plasticity and toughness of the steel, and affect the welding performance of the steel, such as TiN precipitated during the solidification of molten steel The inclusion size has an important relationship with the nitrogen content in molten steel and its solidification segregation. In order to effectively control the nitrogen content in special steel, major domestic steel mills will take corresponding optimization measures in each smelting process of steelmaking to control the nitrogen content in molten steel. For example: in the converter blowing process, the denitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/072C21C7/00B22D11/113B22D11/117
CPCC21C7/10C21C7/072C21C7/0056B22D11/113B22D11/117
Inventor 陈永峰左小坦赵立陶群南张洪彪张亚兵
Owner WUHU XINXING DUCTILE IRON PIPES
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