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Steel-making method of ultra-low carbon steel

A technology of ultra-low carbon steel and converter smelting, which is applied in the manufacture of converters, casting molten material containers, manufacturing tools, etc. It can solve problems such as crystallizer liquid level fluctuations, reduce oxidation in slag, reduce secondary oxidation, The effect of reducing sticking

Active Publication Date: 2022-03-29
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a steelmaking method for ultra-low carbon steel, which solves the technical problem of improving the crystallizer liquid level fluctuation in the continuous casting process of ultra-low carbon steel, and reducing the phenomenon of nodulation and blockage at the nozzle

Method used

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  • Steel-making method of ultra-low carbon steel
  • Steel-making method of ultra-low carbon steel
  • Steel-making method of ultra-low carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Steel for automobile O5 plates was smelted in 6 furnaces for 1 casting, and the converter was produced according to the high-drawing carbon process. The carbon content and oxygen content at the end point of the converter are shown in Table 3. Combined with the oxygen content at the end of the converter, the converter top slag modification is dynamically adjusted, and the specific modifier addition amount is shown in Table 3.

[0043] table 3

[0044]

[0045] Through the above dynamic top slag modification, the RH inbound and outbound TFe of 6 furnaces of high value-added automotive O5 plates are well controlled, with an average RH inbound TFe content of 3.8%, and an average RH outbound TFe content of 5.2%.

[0046] The bell-type long nozzle is used for submerged casting under the liquid surface to reduce the probability of secondary oxidation of molten steel during casting.

[0047] The cover is argon-sealed throughout the whole process. Oxygen is blown on the cove...

Embodiment 2

[0051] 8 furnaces of steel for automobile O5 plates were smelted in 1 casting time, and the converter was produced according to the high-drawing carbon process. The carbon content and oxygen content at the end point of the converter are shown in Table 4. Combined with the oxygen content at the end of the converter, the converter top slag modification is dynamically adjusted, and the specific modifier addition amount is shown in Table 4.

[0052] Table 4

[0053]

[0054] Through the above-mentioned dynamic top slag modification, the RH inbound and outbound TFe control of the high value-added automobile O5 plate of the 8 furnaces is stable, the average TFe content of RH inbound is 3.25%, and the average TFe content of RH outbound is 4.7%.

[0055] The bell-type long nozzle is used for submerged casting under the liquid surface to reduce the probability of secondary oxidation of molten steel during casting.

[0056] The cover is argon-sealed throughout the whole process. Oxy...

Embodiment 3

[0060] Steel for automobile O5 plates was smelted in 8 heats for 1 casting, and the converter was produced according to the high-drawing carbon process. The carbon content and oxygen content at the end point of the converter are shown in Table 5. Combined with the oxygen content at the end of the converter, the converter top slag modification is dynamically adjusted, and the specific modifier addition amount is shown in Table 5.

[0061] table 5

[0062]

[0063] Through the above-mentioned dynamic top slag modification, the RH inbound and outbound TFe control of 8 furnaces of high value-added automobile O5 plates is stable, the average TFe content of RH inbound is 2.9%, and the average TFe content of RH outbound is 4.8%.

[0064] The bell-type long nozzle is used for submerged casting under the liquid surface to reduce the probability of secondary oxidation of molten steel during casting.

[0065] The cover is argon-sealed throughout the whole process. Oxygen is blown on ...

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Abstract

According to the steelmaking method of the ultra-low carbon steel, the production process comprises a converter smelting procedure, an RH refining procedure and a continuous casting procedure, and according to the continuous casting procedure, the depth of a submersed nozzle of a tundish inserted into the liquid level is 145-155 mm, the depth of a submersed nozzle of a tundish inserted into the liquid level is 175-185 mm, and the depth of a submersed nozzle of a tundish inserted into the liquid level is 160-170 mm. And the crystallizer liquid level fluctuation phenomenon is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical production, and in particular relates to a steelmaking method for ultra-low carbon steel. Background technique [0002] The quality requirements of automotive steel are becoming increasingly stringent, and the quality requirements of high-value-added high-surface automotive panels are becoming more stringent, which requires steelmaking to provide high-surface-quality slabs for steady-state pouring. [0003] Since the high-surface automobile O5 panel is interstitial-free steel, the requirement for carbon content is extremely low. Generally, the carbon content is required to be ≤0.002%. Steelmaking and smelting are aluminum deoxidation. Combined with its own process characteristics, according to the principle of carbon-oxygen product balance, the extremely low The carbon content corresponds to a relatively high oxygen content, and the oxygen content in molten steel can easily react with alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/36C21C7/10B22D11/16B22D11/18B22D41/50C22C33/04C22C38/02C22C38/04C22C38/06C22C38/14
CPCC21C5/28C21C5/36C21C7/10B22D11/16B22D11/18B22D41/50C22C33/04C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14Y02P10/20
Inventor 姜丽梅朱坦华于晓飞韩闯闯程迪武志杰周钢武伟
Owner HANDAN IRON & STEEL GROUP
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