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Method for smelting phosphorus-containing ultra-low carbon steel

A smelting method, ultra-low carbon steel technology, applied in the manufacture of converters, etc., can solve problems affecting production efficiency, product quality hazards, nodules, etc., to improve castability, increase the purity of molten steel, and improve steel quality Effect

Inactive Publication Date: 2016-04-13
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When pouring Ti-containing ultra-low carbon steel, nodules occur in the submerged nozzle, which seriously affects production efficiency and harms product quality
For Ti-containing steel, adding P element will make the nozzle nodulation problem more serious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: The steel type is: 210P1; wherein the P content is 0.08 wt%, and the C content is 0.0029 wt%.

[0015] Hot metal pretreatment: Use a desulfurization spray gun to spray magnesium-based desulfurization powder into the molten iron. The mass ratio of CaO / Mg is 4:1, and the slag is clean. When the molten iron is S≤0.003wt%, the molten iron is transferred to the converter for smelting.

[0016] Converter smelting: deoxidize and reduce carbon in the converter, and the oxygen blowing time is 15min; add slagging material to the molten steel during the smelting process, when the C0.04wt% and O0.06wt% in the molten steel, and the temperature of the molten steel in the converter reaches 1690℃ When the steel is tapped into the ladle, the slag blocking process is adopted during the tapping process, and 3.5kg / t white ash is added to the argon station.

[0017] LF furnace refining: The electrode is used to heat the molten steel, and at the same time, 1t of white ash (260 tons of LF...

Embodiment 2

[0020] Example 2: 170P1; wherein the P content is 0.04 wt%, and the C content is 0.0020 wt%.

[0021] Hot metal pretreatment: Use a desulfurization spray gun to spray magnesium-based desulfurization powder into the molten iron. The mass ratio of CaO / Mg is 4:1 and the slag is clean. When the molten iron is S≤0.003wt%, the molten iron is transferred to the converter for smelting.

[0022] Converter smelting: deoxidize and reduce carbon in the converter, and the oxygen blowing time is 18min; add slagging material to the molten steel during the smelting process, when the C is 0.05wt%, O0.08wt% in the molten steel, and the temperature of the molten steel in the converter reaches 1710℃ When the steel is tapped into the ladle, the slag blocking process is adopted during the tapping process, and 3kg / t white ash is added to the argon station.

[0023] LF furnace refining: The electrode is used to heat the molten steel, and at the same time, 1t of white ash (260 tons of LF furnace) is added in...

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PUM

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Abstract

The invention provides a method for smelting phosphorus-containing ultra-low carbon steel. The method comprises the first step of pretreating molten iron, specifically, blowing desulphurizing powder into the molten iron to enable the S content to be less than or equal to 0.003wt%, the second step of conducting deoxygenation and decarburization in a converter, blowing oxygen for 15-18 min, adding slag making materials, conducting slag-stopping and steel tapping when the content of C in the molten steel is less than or equal to 0.06%, the content of O reaches 0.05-0.09%, and the temperature of the molten steel in the converter reaches 1680-1720 DEG C, and adding 2-5 kg / t lime through an argon station, the third step of carrying out ladle furnace (LF) refining, specifically, adding slag former into a steel ladle, carrying out bottom argon blowing and stirring, transferring the molten steel to carry out RH vacuum refining, decarburization and denitrification when the temperature of the molten steel reaches 1630-1650 DEG C, carrying out alloying in batches when the content of C in the steel is less than or equal to 0.0050wt%, carrying out still standing for 15-25 min and then continuous casting when the content of compositions and temperature reach the target content and temperature, blowing argon into spaces between plates at a long nozzle, a stopper rod, an upper nozzle and a submerged nozzle when pouring is conducted on a tundish, and adding carbon-free covering agents to protect pouring. By means of the method, the purity degree of the molten steel and the castability of the steel can be improved, nozzle clogging is effectively controlled, the smelting production efficiency and the steel quality are improved, consumption of spare parts is reduced, and the cost of per ton of steel is lowered.

Description

Technical field [0001] The invention belongs to the field of steelmaking technology, and particularly relates to a method for smelting phosphorus-containing ultra-low carbon steel. Background technique [0002] RH vacuum smelting of ultra-low carbon steel (C≤0.0050%) technology has become more mature. With the rapid development of the automobile industry, higher requirements are put forward for ultra-low carbon steel for automobiles, which require high strength and excellent deep drawing performance. . The strengthening element C in the ultra-low carbon steel is low and fixed, so the strengthening element P is usually added to increase the strength and meet the requirements of high strength. [0003] The smelting of phosphorus-containing ultra-low carbon steel mainly solves the problems of decarburization, nitrogen reduction, purity control and microalloying to eliminate C and N interstitial atoms. The technological difficulties of decarburization and nitrogen reduction have been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C5/28C21C7/04C21C7/10
Inventor 吕志勇张宏亮崔福祥刘博张立夫李超王金辉赵雷
Owner ANGANG STEEL CO LTD
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