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RH decarburization method of ultralow-carbon and high-chromium corrosion resisting steel

A corrosion-resistant steel and ultra-low carbon technology, applied in the field of steelmaking, can solve problems such as the difficulty of reducing C content, and achieve the effect of reducing oxidation

Active Publication Date: 2016-11-23
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above smelting process can realize the smelting of high-chromium steel with a C content of more than 0.015%, but it is difficult to further reduce the C content. Therefore, the development of RH deep decarburization treatment process suitable for ultra-low carbon high-chromium steel has broad market prospects and economic benefits. value, providing a stable RH decarburization method for the smelting of ultra-low carbon high chromium steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) The RH enters the station to measure the oxygen temperature and take samples to determine the chemical composition. The temperature is 1682°C, the C content is 0.295%, the O content is 0.0185%, and the Cr content is 9.78%. ~100mbar, oxygen blowing with the oxygen gun, the height of the gun position is 4.5m, and the flow rate of oxygen blowing is 40Nm 3 / min, oxygen blowing time 1.5min, stop oxygen blowing, continue decarburization for 4.8min, then set oxygen, measure temperature, continue oxygen blowing decarburization according to oxygen content.

[0026] 2) When the C content reaches 0.146%, turn on the fourth-stage vacuum pump to reduce the pressure of the vacuum chamber to below 5-20mbar; when the C content reaches 0.048%, turn on the fifth-stage vacuum pump to reduce the pressure of the vacuum chamber to below 2mbar, and RH decarburization The final C content is 0.0021%, the Cr content is 9.55%, and the temperature is 1622°C.

[0027] 3) During the RH decarburi...

Embodiment 2

[0031] 1) The RH enters the station to measure the oxygen temperature and take samples to determine the chemical composition. The temperature is 1675°C, the C content is 0.106%, the O content is 0.0316%, and the Cr content is 9.45%. ~20mbar, oxygen blowing with the oxygen gun, the height of the gun position is 4.2m, and the flow rate of oxygen blowing is 38Nm 3 / min, oxygen blowing time 1.2min, stop oxygen blowing, continue decarburization for 4.6min, then set oxygen, measure temperature, continue oxygen blowing decarburization according to oxygen content.

[0032] 2) When the C content reaches 0.045%, turn on the five-stage vacuum pump to reduce the pressure of the vacuum chamber to below 2mbar. After RH decarburization, the C content is 0.0016%, the Cr content is 9.28%, and the temperature is 1621°C.

[0033] 3) During the RH decarburization process, the number of oxygen blowing decarburization times is 4 times, the oxygen blowing time lasts for 1-2 minutes, and the oxygen b...

Embodiment 3

[0037]1) RH enters the station to measure oxygen and measure the temperature, and take samples to determine the chemical composition. The temperature is 1678°C, the C content is 0.206%, the O content is 0.0215, and the Cr content is 9.67%. 100mbar, oxygen blowing with the oxygen gun, the height of the gun position is 4.3m, and the flow rate of oxygen blowing is 40Nm 3 / min, oxygen blowing time 1.7min, stop oxygen blowing, continue decarburization for 5.1min, then set oxygen, measure temperature, continue oxygen blowing decarburization according to oxygen content.

[0038] 2) When the C content reaches 0.148%, turn on the fourth-stage vacuum pump to reduce the pressure of the vacuum chamber to below 5-20mbar; when the C content reaches 0.047%, turn on the fifth-stage vacuum pump to reduce the pressure of the vacuum chamber to below 2mbar, and RH decarburization The final C content is 0.0022%, the Cr content is 9.48%, and the temperature is 1625°C.

[0039] 3) During the RH dec...

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Abstract

The invention discloses a RH decarburization method of ultralow-carbon and high-chromium corrosion resisting steel. In the decarburization process, an oxygen content in molten steel is kept within 0.01-0.05%; and meanwhile, the temperature of the molten steel in the decarburization process is not lower than 1620 DEG C, so that a carton content of the molten steel in ending of RH decarburization is reduced below 0.005%, and the burning loss of a chromium element in the molten steel is not higher than 2%. The method, provided by the invention, can produce the ultralow-carbon and high-chromium corrosion resisting steel with a chromium content of above 7%; the carton content of the molten steel in ending of RH decarburization is reduced below 0.005%; and the burning loss of the chromium element in the molten steel is not higher than 2%.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and particularly provides an RH decarburization method for producing ultra-low-carbon high-chromium corrosion-resistant steel. Background technique [0002] C is an important strengthening element in steel bars. It can significantly improve the strength of steel through solid solution strengthening and precipitation strengthening. However, C and Cr have a strong combination ability and can form a series of complex carbides with Cr. While increasing the strength and hardness of the steel, it significantly reduces the corrosion resistance of the steel. In addition, too high C content will reduce the plasticity and toughness of steel, and deteriorate the weldability of steel. Therefore, in order to improve the corrosion resistance of steel, the development of ultra-low carbon high chromium steel has become a development trend. [0003] When smelting high-chromium steel with Cr content ≥ 7%, it...

Claims

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Application Information

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IPC IPC(8): C21C7/068C21C7/10
CPCC21C7/0685C21C7/10
Inventor 赵家七邹长东孙凤梅周青峰麻晗
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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