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A refining method of lf furnace in the production of container steel in csp production line

A container and production line technology, which is applied in the smelting field of container steel production with CSP short process, can solve the problems of low component qualification rate, low steel breakout rate, frequent steel pouring interruptions, etc.

Active Publication Date: 2020-05-05
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the optimization control of one-time heating, one-time slagging, desulfurization and alloy addition in the refining process of the steelmaking LF furnace, it can significantly solve the problem of surface edge crack defect correction rate and low component qualification rate of the existing CSP production line for container steel And frequent steel pouring breaks and other problems, so that the correction rate of edge crack defects is as low as less than 1.0%, the qualified rate of components is increased to more than 98%, and the steel breakout rate is as low as less than 0.3%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A refining method of the LF furnace in the production of container steel in the CSP production line:

[0033] 1) After being smelted in the converter, it enters the LF furnace, and argon is blown at the double bottom, during which:

[0034] Use argon gas to blow through the large tank breathable brick, and the flow rate of argon gas is 1200L / min; after blowing through, adjust the flow rate of argon gas to 400L / min;

[0035] 2) Using one-time heating:

[0036] Heating for 9 minutes, the temperature is directly raised to 1625°C; the argon flow rate during the heating process is set at 250L / min;

[0037] 3) One-time slagging, desulfurization and alloy addition:

[0038] First, carry out slagging and desulfurization: adjust the flow rate of argon to 800L / min, add aluminum shot 1.0kg / ton steel, lime 5.0kg / ton steel, refining slag addition 0.28kg / ton steel, the time is 9min;

[0039] After 5 minutes of slagging and desulfurization, start to add ferrosilicon, ferromanganese...

Embodiment 2

[0047] A refining method of the LF furnace in the production of container steel in the CSP production line:

[0048] 1) After being smelted in the converter, it enters the LF furnace, and argon is blown at the double bottom, during which:

[0049] Use argon gas to blow through the large tank breathable brick, and the flow rate of argon gas is 1200L / min; after blowing through, adjust the flow rate of argon gas to 350L / min;

[0050] 2) Using one-time heating:

[0051] Heating for 8 minutes, the temperature is directly raised to 1625°C; the argon flow rate during the heating process is set at 350L / min;

[0052] 3) One-time slagging, desulfurization and alloy addition:

[0053] First, slagging and desulfurization: adjust the argon flow to 700L / min, add aluminum shot 0.8kg / ton steel, lime 4.0kg / ton steel, refining slag addition 0.25kg / ton steel, the time is 8min;

[0054] After 4 minutes of slagging and desulfurization, start to add ferrosilicon, ferromanganese, ferrophosphorus,...

Embodiment 3

[0062] A refining method of the LF furnace in the production of container steel in the CSP production line:

[0063] 1) After being smelted in the converter, it enters the LF furnace, and argon is blown at the double bottom, during which:

[0064] Use argon gas to blow through the large tank breathable brick, and the flow rate of argon gas is 1200L / min; after blowing through, adjust the flow rate of argon gas to 300L / min;

[0065] 2) Using one-time heating:

[0066] Heating for 9 minutes, the temperature is directly raised to 1630°C; the argon flow rate during the heating process is set at 300L / min;

[0067] 3) One-time slagging, desulfurization and alloy addition:

[0068] First, slagging and desulfurization: adjust the argon flow to 600L / min, add aluminum shot 0.7kg / ton steel, lime 4.5kg / ton steel, refining slag addition 0.25kg / ton steel, the time is 8min;

[0069] After 5 minutes of slagging and desulfurization, start to add ferrosilicon, ferromanganese, ferrophosphorus,...

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Abstract

The invention relates to a refining method of an LF (ladle furnace) for producing steel for containers in a CSP production line. Refining in the LF is performed after smelting in a convertor; one-timeheating is adopted, and one-time slagging, desulfurization and alloy addition is performed; calcium treatment is performed; and then soft blow is performed for 3 to 4 min, and then conventional subsequent procedures are implemented. According to the refining method, in the refining procedure of the steelmaking LF, the one-time heating and the one-time slagging, desulfurization and alloy additionare optimally controlled, so that the problems of low surface edge crack defect changing rate and component qualified rate, frequent interrupted steel casting and the like of an existing CSP production line for producing the steel for the containers can be obviously solved, the edge crack defect changing rate is reduced within 1.0%, the component qualified rate is increased to more than 98%, and the steel breakout rate is reduced within 0.3%.

Description

technical field [0001] The invention relates to the field of container steel production, in particular to a smelting method for producing container steel with a CSP short process. Background technique [0002] Container steel (SPA-H) itself is a crack sensitive steel. The use of CSP production lines to produce container steel, because the continuous casting of the production line uses a funnel-shaped mold, and the billet casting speed is fast, the deformation is large, etc., which increases the risk of container steel production by CSP technology, and may also There will be quality defects such as edge cracks. In addition, there are serious problems such as the low pass rate of internal control of steelmaking components, and the low pass rate of standard pull due to yellow reporting and large liquid level fluctuations in continuous casting and pouring of steel. [0003] Chinese Patent No. 01114640 discloses a method for producing container boards. It introduces a conventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C7/072
CPCC21C7/0006C21C7/0025C21C7/0056C21C7/064C21C7/072
Inventor 徐培春刘凯吴维轩王云东黄东熊英邱晨叶飞
Owner 武汉钢铁有限公司
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