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A rh furnace refining hydrogen and oxygen control process

A process, hydrogen-oxygen technology, applied in the field of iron and steel smelting, can solve the problems of reduced end face shrinkage and impact toughness, and reduced steel elongation, and achieve the effects of shortening cycle, fast slag formation, and cost reduction

Active Publication Date: 2020-11-03
JINGYE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is to cause a large number of fine crack defects-white spots inside the steel. The smooth silver-white spots on the steel end surface will also cause white spots inside the steel, which will significantly reduce the elongation of the steel, especially the shrinkage and impact of the end surface. Toughness is reduced even more and can sometimes be close to zero

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A RH furnace refining hydrogen and oxygen control process, the process steps are:

[0028] Step (1): Measure the temperature of the molten steel in the ladle, and take a sample to measure the N and C content. As the starting condition of the RH treatment, the ladle is raised to the treatment position so that the riser is inserted into the molten steel. The insertion depth of the riser is 520mm; the initial temperature of RH vacuum cycle degassing treatment is 1580℃;

[0029] Step (2): Vacuum operation, using high-pressure nitrogen and oxygen mixing ratio of 8:2 or argon and oxygen mixing ratio of 8:2 as the lifting gas of the riser steel liquid; control RH according to the measured nitrogen content The vacuum degree is maintained at 3-4.5kPa, the weight content of the main components of the added refining slag is: CaO 57-67%, Al2O3 33%, SiO2 8%, MgO≤2%, TiO2≤0.1%, others are Fe2O3, Fe3O4 The sum of, P and S is less than or equal to 2%; the refining slag is added in 2-3 batc...

Embodiment 2

[0035] A RH furnace refining hydrogen and oxygen control process, the process steps are:

[0036] Step (1): Measure the temperature of the molten steel in the ladle, and take a sample to measure the N and C content. As the starting condition of the RH treatment, the ladle is raised to the treatment position so that the riser is inserted into the molten steel. The insertion depth of the riser is 500-550mm; the initial temperature of RH vacuum cycle degassing treatment is 1580-1590℃;

[0037] Step (2): Vacuum operation, using high-pressure nitrogen and oxygen mixing ratio of 8:2 or argon and oxygen mixing ratio of 8:2 as the lifting gas of the riser steel liquid; control RH according to the measured nitrogen content The vacuum degree is maintained at 3-4.5kPa, the weight content of the main components of the added refining slag is: CaO 58%, Al2O3 33%, SiO2 8%, MgO≤2%, TiO2≤0.1%, others are Fe2O3, Fe3O4, P The sum of S and S is less than or equal to 2%; the refining slag is added in ...

Embodiment 3

[0043] A RH furnace refining hydrogen and oxygen control process, the process steps are:

[0044] Step (1): Measure the temperature of the molten steel in the ladle, and take a sample to measure the N and C content. As the starting condition of the RH treatment, the ladle is raised to the treatment position so that the riser is inserted into the molten steel. The insertion depth of the riser is 500-550mm; the initial temperature of RH vacuum cycle degassing treatment is 1580-1590℃;

[0045] Step (2): Vacuum operation, using high-pressure nitrogen and oxygen mixing ratio of 8:2 or argon and oxygen mixing ratio of 8:2 as the lifting gas of the riser steel liquid; control RH according to the measured nitrogen content The vacuum degree is maintained at 3-4.5kPa, the weight content of the main components of the added refining slag is: CaO 57-67%, Al2O3 33%, SiO2 8%, MgO≤2%, TiO2≤0.1%, others are Fe2O3, Fe3O4 The sum of, P and S is less than or equal to 2%; the refining slag is added in...

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Abstract

The invention discloses a RH furnace refining hydrogen oxygen control process. The RH furnace refining hydrogen oxygen control process is characterized by comprising the following steps that temperature measurement is carried out on molten steel; sampling and measuring N, C content are carried out; vacuumizing operation is carried out; high-pressure nitrogen gas and oxygen are adopted for mixing or argon gas and oxygen are used as lifting gas; the vacuum degree is kept at 3-4.5 kPa, and refining slag is added; then a decarbonization process is carried out; ferrochrome is added in the early stage of vacuum circulation degassing refining to perform chromium alloying; and steel liquid temperature measurement and oxygen measurement are carried out; deoxidation operation is carried out by adding low-carbon silicon iron, and alloying adjustment is carried out; dehydrogenation and tranquilizing treatment are carried out; the vacuum is broken, and argon blowing from the bottom and soft stirring is carried out on a steel ladle.

Description

Technical field [0001] The invention belongs to the technical field of steel smelting, and particularly relates to a RH furnace refining hydrogen and oxygen control process. Background technique [0002] The RH refining process is a metallurgical method that relies on the pressure difference between the vacuum chamber and the atmosphere to elevate the molten steel in the ladle to the vacuum chamber, and causes the molten steel to be continuously recycled by blowing argon. This process is mainly used for dehydrogenation, denitrification, deoxidation, decarburization and desulfurization, and has the functions of alloy fine-tuning and temperature adjustment. With the development of the metallurgical industry, the requirements for the quality of steel have become higher and higher, and its application has laid the foundation for the production of high value-added varieties of steel by steel mills. [0003] RH vacuum treatment is one of the many out-of-furnace refining methods. Its mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/068C21C7/06C21C7/04
Inventor 张觉灵杨海西樊利智杜雪飞
Owner JINGYE STEEL CO LTD
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