Calcium-calcium aluminate core-spun yarn for steel smelting

A technology of cored wire and calcium aluminate, which is applied in the field of metallurgy, can solve the problems of low yield rate of calcium metal, which is not very ideal, and affects the performance of steel, so as to save resources of calcium metal powder, fully contact and improve the utilization rate. Effect

Inactive Publication Date: 2009-10-07
INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two cored wires can already meet the technical requirements of refining some steel types, but relatively speaking, they are not very satisfactory. This is because the phenomenon of silicon increase in molten steel will occur when feeding CaSi wire, and the increase in silicon content will also affect the quality of steel. final performance
When Fe-Ca cored wire is used, the above-mentioned silicon increase phenomenon will not occur, but the metal calcium will quickly gasify after the Fe-Ca powder packed inside the cored wire enters the molten steel, and it is easy to generate large air masses. Before contacting and reacting with impurities in the steel, it has already floated to the surface of the molten steel, making the yield of metallic calcium low, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In a 150-ton ladle in a steel plant, the steel type is STSC steel, which is cast into thin slabs. After being refined in an LF furnace, calcium metal and calcium aluminate-based pre-melted slag cored wires are directly fed. Its core wire composition is: Ca: 27%, CaO: 37% Al 2 o 3 : 33%, others: 3%, cored wire diameter Φ13mm, wire feeding speed 150m / min, feeding 400m, slab sampling for metallographic analysis, non-metallic inclusions in steel are spherical inclusions containing calcium and titanium , the inclusion size is less than 30μ. After the wire-feeding treatment, the sulfur content in the steel was reduced from 200ppm to 150ppm.

Embodiment 2

[0017] In a 150-ton steel ladle in a steel factory, the steel type is ST12 low-carbon steel, and thin slabs are cast. Slag cored wire. Its powder composition is: Ca: 25%, CaO: 38% Al 2 o 3 : 35%, others: 2%, cored wire diameter Φ13mm, wire feeding speed 180m / min, feeding 450m, slab sampling for metallographic analysis, non-metallic inclusions in steel are spherical composite inclusions containing calcium and titanium The size of inclusions and inclusions are all less than 30μ. After the wire-feeding treatment, the sulfur content in the steel was reduced from 195ppm to 135ppm.

Embodiment 3

[0019] In a 150-ton ladle in a steel plant, the steel type is STSC steel, which is cast into thin slabs. After being refined in an LF furnace, calcium metal and calcium aluminate-based pre-melted slag cored wires are directly fed. Its core wire composition is: Ca: 0%, CaO: 50% Al 2 o 3 : 50%, cored wire diameter Φ13mm, wire feeding speed 150m / min, feeding 400m, billet sampling for metallographic analysis, non-metallic inclusions in steel are spherical inclusions containing calcium and titanium, and the size of the inclusions is less than 30μ. After the wire-feeding treatment, the sulfur content in the steel was reduced from 200ppm to 150ppm.

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Abstract

This invention relates to a cored wire containing metallic calcium for external refining of molten steel, which is characterized in that the cored wire also contains a certain amount of powder prepared from calcium silicate, among which calcium metaaluminate 12CaO·7Al2O3 powder is the best . Using this kind of cored wire for out-of-furnace refining can significantly increase the utilization rate of metal calcium, reduce the temperature drop of molten steel, and obtain satisfactory metallurgical effects.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a cored wire containing metallic calcium for external refining of molten steel. Background technique [0002] In the iron and steel smelting process, the refining process outside the furnace has been widely used. The refining process outside the furnace can further desulfurize, deoxidize and denature the inclusions to produce higher-quality alloy steel to meet the needs of industrial and agricultural development and construction. In the post-processing process of refining outside the furnace, it can be divided into two categories according to different refining equipment, one is the ladle powder spraying method, and the other is the ladle wire feeding method. Among them, the desulfurization and deoxidation effect of the ladle spraying method is relatively good, but the spraying equipment used is relatively complicated, the investment is large, the operation is difficult, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04
Inventor 孙中强
Owner INST OF METALLURGICAL TECH DONGBEI UNIV SHENYANG
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