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RH furnace refining hydrogen oxygen control process

A process, a hydrogen-oxygen technology, applied in the field of iron and steel smelting, can solve the problems of steel elongation reduction, end surface shrinkage rate and impact toughness reduction, etc., and achieve the effects of shortening the cycle, fast slagging speed, and uniform liquid composition

Active Publication Date: 2019-06-07
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 samples to measure the N and C content. As the starting condition for RH treatment, the ladle is raised to the processing position to insert the riser into the molten steel. The depth of riser insertion is 520mm; RH vacuum cycle degassing treatment start temperature is 1580℃;

[0029] Step (2): Vacuuming operation, using a mixture of high-pressure nitrogen and oxygen at a mixing ratio of 8:2 or argon and oxygen at a mixing ratio of 8:2 as the lifting gas for the riser molten steel; control the RH according to the measured nitrogen content The vacuum degree is kept at 3-4.5kPa, and 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 , P, S sum ≤ 2%; refining slag is added in 2-3 batches, and the amount added ea...

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 samples to measure the N and C content. As the starting condition for RH treatment, the ladle is raised to the processing position to insert the riser into the molten steel. The depth of riser insertion is 500-550mm; the initial temperature of RH vacuum cycle degassing treatment is 1580-1590°C;

[0037] Step (2): Vacuuming operation, using a mixture of high-pressure nitrogen and oxygen at a mixing ratio of 8:2 or argon and oxygen at a mixing ratio of 8:2 as the lifting gas for the riser molten steel; control the RH according to the measured nitrogen content The vacuum degree is maintained at 3-4.5kPa, and 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 , S sum ≤ 2%; refining slag is added in 2-3 batches, a...

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 samples to measure the N and C content. As the starting condition for RH treatment, the ladle is raised to the processing position to insert the riser into the molten steel. The depth of riser insertion is 500-550mm; the initial temperature of RH vacuum cycle degassing treatment is 1580-1590°C;

[0045] Step (2): Vacuuming operation, using a mixture of high-pressure nitrogen and oxygen at a mixing ratio of 8:2 or argon and oxygen at a mixing ratio of 8:2 as the lifting gas for the riser molten steel; control the RH according to the measured nitrogen content The vacuum degree is kept at 3-4.5kPa, and 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 , P, S sum ≤ 2%; refining slag is added in 2-3 batches, and ...

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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 iron and steel smelting, and in particular relates to a process for controlling hydrogen and oxygen in RH furnace refining. 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 lift the molten steel in the ladle to the vacuum chamber, and continuously circulates the molten steel by blowing argon. This process is mainly used for dehydrogenation, denitrogenation, 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 steel quality are getting higher and higher, and its application has laid the foundation for steel mills to produce high value-added varieties of steel. [0003] RH vacuum treatment is one of many refining methods outside the furnace. Its main ...

Claims

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Application Information

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Patent Type & Authority Applications(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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