Technology for processing steel liquid calcium by adopting hard high-purity calcium wire

A technology of calcium treatment and calcium wire, which is applied in the field of steelmaking, can solve the problems of cleanliness control, large consumption, and low recovery rate of calcium element, so as to reduce the ratio of set holes, realize stable control, and solve splashing problem effect

Inactive Publication Date: 2017-05-10
QINHUANGDAO SHOUQIN METAL MATERIAL
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through the retrieval of domestic patents related to molten steel calcium treatment process, it can be seen that silicon-calcium wire is generally used for molten steel calcium treatment in the current smelting process. The increase of silicon in the liquid brings certain difficulties to the control of smelting components; at the same time, the use of silicon-calcium wire does not solve the serious problem of secondary oxidation caused by molten steel splashing, resulting in a low calcium recovery rate, only 10%-15%. At the same time, the consumption is large, and the stable control of Ca content cannot be guaranteed, which also has a great impact on cleanliness control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Steel type D32-1, ladle capacity 100t, smelting process is to use pure calcium wire for calcium treatment after ladle furnace refining. High-quality high-purity calcium line for calcium treatment process:

[0014] The inner core of the pure calcium wire adopts high-density solid pure calcium rod, the calcium content is 96%, and the thickness of the steel strip is 1.2mm;

[0015] The process parameters of the wire feeding process are controlled as follows: the feeding speed of the hard high-purity calcium wire is controlled at 1.50m / s; the calculated feeding depth is 30cm from the deepest point where the calcium wire reaches the ladle to the bottom of the ladle; the temperature of the molten steel at the end of refining is 1580°C.

[0016] After this process, the Ca content in the steel after feeding the line is 0.0018%, and the recovery rate of calcium element is 42%. The process of calcium treatment is stable, and the problem of splashing is solved. 54 furnaces are pr...

Embodiment 2

[0018] Steel type X70, ladle capacity 100t, smelting process is RH vacuum refining and then using pure calcium wire for calcium treatment process, after RH vacuum refining, the Ca content in the steel is 0.0020%, and the amount of wire feeding is 0.55m / (t steel) hard High-purity calcium line for calcium treatment process:

[0019] The inner core of the pure calcium wire adopts high-density solid pure calcium rod, the calcium content is 96%, and the thickness of the steel strip is 1.2mm;

[0020] The process parameters of the wire feeding process are controlled as follows: the feeding speed of the hard high-purity calcium wire is controlled at 1.50m / s; the calculated feeding depth is 25cm from the deepest point where the calcium wire reaches the ladle to the bottom of the ladle; the temperature of the molten steel at the end of refining is 1583°C.

[0021] After this process, the Ca content in the steel after feeding the line is 0.0020%, and the recovery rate of calcium elemen...

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Abstract

The invention provides a technology for processing steel liquid calcium by adopting a hard high-purity calcium wire and belongs to the technical field of steel making. According to the technology for processing the steel liquid calcium by adopting the hard high-purity calcium wire, technology parameters such as the steel strip thickness, the wire feeding speed and the wire feeding depth in the wire feeding process are optimized, so that the steel liquid splash problem is solved, the yield of the calcium element is increased, the yield of Ca is larger than 40%, the finished Ca content is stably controlled, the proportion of nozzle blocking in the continuous casting process is decreased, the current problems existing in steel mills are solved, and the smelting cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a molten steel calcium treatment process using a hard high-purity calcium wire. Background technique [0002] In the process of iron and steel smelting, the use of calcium treatment technology can achieve deoxidation, desulfurization, denaturation of inclusions and improve pourability of molten steel. At present, calcium treatment technology is generally used to feed calcium wire into molten steel to denature the sulfide inclusions (type A inclusions) and oxide inclusions (type B inclusions) in steel. The use of calcium treatment technology can improve the nozzle clogging problem caused by high melting point oxide inclusions in the casting process, thereby improving the castability of molten steel. At present, most of the calcium treatment processes use silicon-calcium wires, and a few single-layer or double-layer pure calcium wires. Calcium silicon wire, single...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
CPCC21C7/0056C21C7/0006
Inventor 史志强初仁生王星李战军刘金刚杨荣光王东柱万潇
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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