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Smelting method capable of controlling gas valve steel inclusions

A smelting method and a technology for controlling gas valves, which are applied in the field of metallurgical production process design to achieve the effect of reducing inclusions and improving the quality of finished products

Active Publication Date: 2017-08-25
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may be due to CaF 2 Erosion of the lining, so that the MgO in the lining enters the molten steel, resulting in MgO.A1 2 o 3 Inclusion generation is easier

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Before AOD is mixed with molten steel, lime 4kg / t steel is added at the bottom of the furnace, and molten steel is mixed, and the measured temperature is 1510°C, and ferrosilicon is added to raise the temperature, and the amount of ferrosilicon added is 2.4kg / t steel; When the temperature is ≥1600℃, add lime 20kg / t steel and slagging agent 5kg / t steel; when the furnace temperature is ≥1620℃, add lime 15kg / t steel and slag adjusting agent 4kg / t steel. After the deoxidation is completed, according to the basicity of the ladle slag, an appropriate amount of lime and slag adjusting agent is added, and the final AOD slag basicity is controlled to 1.9. Slag amount control after tapping: Ladle slag thickness is 50mm.

[0025] After the molten steel reaches the LF treatment position, add the modifier 2kg / t steel; heat the molten steel for 10 minutes, add the second batch of modifier, 2kg / t steel; heat the molten steel for about 20 minutes, add the third batch of modifier, 1.5kg...

Embodiment 2

[0029] Before AOD is mixed with molten steel, add lime 8kg / t steel at the bottom of the furnace, add molten steel, measure the temperature at 1515°C, and add ferrosilicon to raise the temperature, and the amount of ferrosilicon added is 2.0kg / t steel; When the temperature is ≥1600℃, add lime 12kg / t steel and slagging agent 3kg / t steel; when the furnace temperature is ≥1620℃, add lime 18kg / t steel and slag adjusting agent 5kg / t steel. After the deoxidation is completed, according to the basicity of the ladle slag, an appropriate amount of lime and slag adjusting agent is added, and the final AOD slag basicity is controlled at 2.2. Slag amount control after tapping: ladle slag thickness 60mm.

[0030] After the molten steel reaches the LF treatment position, add the modifier 4kg / t steel; heat the molten steel for 10 minutes, add the second batch of modifier, 0.5kg / t steel; heat the molten steel for about 20 minutes, add the third batch of modifier, 1.0kg / t t steel. The flow ra...

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PUM

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Abstract

The invention discloses a smelting method, particularly discloses a smelting method capable of controlling gas valve steel inclusions, belongs to the technical field of metallurgical processing technological design and provides the smelting method capable of controlling the gas valve steel inclusions. Impurities in molten steel of stainless steel can be effectively lowered, and accordingly the inclusions in a finished product stainless steel blank are reduced. The smelting method includes the several steps of adjusting slag by a slag modifier in an AOD smelting furnace, adjusting slag by a modifier in a refining furnace and conducting calcium treatment in an argon blowing environment after refining is completed.

Description

technical field [0001] The invention relates to a smelting method, in particular to a smelting method for controlling gas valve steel inclusions, and belongs to the technical field of metallurgical production process design. Background technique [0002] Valve steel is a necessary material for the manufacture of intake and exhaust valves of gasoline engines and diesel engines, and is also a key material in the entire engine. It is of great importance in the field of transportation power machinery. The production of gas valve steel is a highly specialized field in special steel. Although the quantity is not very large, its working conditions are harsh, usually under the conditions of high temperature, high pressure, high erosion and high abrasion, so it is very important for gas valve steel. The performance requirements of valve steel are relatively high, and at the same time, high requirements are also put forward for the control of inclusions in valve steel. During the use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/072C21C7/076
CPCC21C7/06C21C7/072C21C7/076Y02P10/20
Inventor 张敏曾建华严波杨星地吴国荣戴珍永何盛王建谢鑫马晓涛
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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