Method for producing low phosphorus steel by smelting semisteel

A production method and low-phosphorus steel technology are applied in the metallurgical field to achieve the effects of low production cost, small equipment investment and simple operation method

Inactive Publication Date: 2010-04-21
PANGANG GROUP RESEARCH INSTITUTE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing methods, the production of low-phosphorus steel and ultra-low-phosphorus steel from ordinary molten iron is usually realized by double-link method or double-slag met

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The semi-steel after desulfurization and vanadium extraction of Panzhihua Iron and Steel Co., Ltd. is used as the raw material. The main components of the semi-steel are: 3.82%C, 0.03%Mn, 0.004%S, 0.074%P, and the balance is Fe; After smelting, the semi-steel is mixed into the converter, the oxygen gun is lowered to start blowing oxygen, the oxygen blowing pressure is 0.9Mpa, and the oxygen supply intensity is 3.6m 3 / t 钢 min; at the same time as the oxygen blowing starts, add the first batch of slagging materials active lime, composite slagging agent and high magnesium lime into the furnace, and add all the first batch of slagging materials within 3 minutes of starting the blowing and oxygen supply , the first batch of slagging materials active lime, composite slagging agent and high-magnesia lime were added at 29.5kg / t 钢 , 21kg / t steel, 8kg / t 钢 After the initial slag is formed, add the second batch of slagging materials into the furnace, and add all the second batch...

Embodiment 2

[0024] The semi-steel after desulfurization and vanadium extraction of Panzhihua Iron and Steel Co., Ltd. is used as the raw material. The main components of the semi-steel are: 3.67%C, 0.03%Mn, 0.004%S, 0.081%P, and the balance is Fe; After smelting, the semi-steel is mixed into the converter, the oxygen gun is lowered to start blowing oxygen, the oxygen blowing pressure is 0.9Mpa, and the oxygen supply intensity is 3.6m 3 / t 钢 min; at the same time as the oxygen blowing starts, add the first batch of slagging materials active lime, composite slagging agent and high magnesium lime into the furnace, and add all the first batch of slagging materials within 3 minutes of starting the blowing and oxygen supply , the first batch of slagging material active lime, composite slagging agent and high-magnesia lime were added in amounts of 32kg / t 钢 、19kg / t 钢 , 10kg / t 钢 After the initial slag is formed, add the second batch of slagging materials into the furnace, and add all the second...

Embodiment 3

[0026] The semi-steel after desulfurization and vanadium extraction of Panzhihua Iron and Steel Co., Ltd. is used as the raw material. The main components of the semi-steel are: 3.52%C, 0.01%Mn, 0.003%S, 0.062%P, and the balance is Fe; After smelting, the semi-steel is mixed into the converter, the oxygen gun is lowered to start blowing oxygen, the oxygen blowing pressure is 0.9Mpa, and the oxygen supply intensity is 3.6m 3 / t 钢 min; at the same time as the oxygen blowing starts, add the first batch of slagging materials active lime, composite slagging agent and high magnesium lime into the furnace, and add all the first batch of slagging materials within 3 minutes of starting the blowing and oxygen supply , the first batch of slagging materials active lime, composite slagging agent and high-magnesia lime are added at 27kg / t 钢 、13kg / t 钢 and 6.5kg / t 钢 After the initial slag is formed, add the second batch of slagging materials into the furnace, and add all the second batch o...

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Abstract

The invention belongs to the field of metallurgy, and relates to a method for producing low phosphorus steel by smelting semisteel, which solves the technical problem of controlling the steelmaking end point of a converter within 0.006 percent. The method is mainly realized by adjusting slag-making parameters of the converter smelting by adopting a single slag method, which comprises that: the slag-making materials added in the converter slag-making process consist of 40-50kg of active lime, 20-30kg of high-magnesium lime and 15-25kg of composite slag former based on per ton of tapping molten steel; and the slag-making materials are added in twice. In addition, by controlling an oxygen supply system and an end point control system, the dephosphorization rate of the converter can reach over 92 percent; molten steel containing less than 0.006 percent of phosphorus is obtained; steel ladle slag de-P and alloy re-P are controlled within 0.002 percent. The method can stably produce finished low phosphorus steel containing less than 0.010 percent of phosphorus, and is characterized by simple operation method, small investment on equipment and low production cost.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a production method for smelting low-phosphorus steel from semi-steel. Background technique [0002] In my country, some iron and steel plants use vanadium-titanium magnetite for smelting. In order to ensure the effective utilization of vanadium resources, vanadium extraction and desulfurization processes are carried out before steelmaking. The sulfur content is 3.4% to 4.0%, the mass percentage content of sulfur is controlled within 0.015%, the content of silicon and manganese heating slagging elements are all traces, the mass percentage content of phosphorus in semi-steel is 0.060% to 0.080%, and the end point of converter steelmaking Phosphorus fluctuates between 0.008% and 0.020%, and the total amount of ladle slag rephosphorization and alloy phosphorus addition fluctuates between 0.005% and 0.008%, that is, the phosphorus content of the finished steel is 0.015% to 0.035%....

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C5/30
Inventor 何为李利刚邱伟陈永杨素波王建李安林杨森祥汪明东
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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