Method for reducing aluminum oxide inclusion in semi-steel steelmaking casting blank

An alumina and casting billet technology, applied in the direction of manufacturing converters, etc., can solve the problems of increased consumption of aluminum and iron, unfavorable performance of molten steel and steel products, and increased production costs, so as to reduce deoxidation costs, reduce Al2O3 inclusions, and improve casting billets. quality effect

Active Publication Date: 2017-12-22
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high oxygen content not only increases the consumption of aluminum and iron, increases the production cost, but also causes t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] The 140t converter adopts semi-steel steelmaking to smelt Q235 steel grade. The process path is:

[0035] Hot metal pretreatment→top and bottom combined blowing converter→RH→continuous casting.

[0036] In molten iron: C 3.2-4.1wt%, Si 0.015-0.030wt%, Mn 0.02-0.04wt%, P 0.06-0.08wt%, S≤0.025wt%.

[0037] The KR method is used to desulfurize the molten iron pretreatment, and the sulfur content in the molten iron after pretreatment is less than 0.015%.

[0038] The specific method of the top and bottom combined blowing converter is:

[0039] Fill the molten iron at 1300~1360℃ and start blowing oxygen. The oxygen flow rate is 30000Nm 3 / h. Start adding auxiliary materials 3 minutes after blowing on.

[0040] The oxygen lance nozzle is 1.4-2m away from the basic lance position of the molten pool metal level, the blowing lance position is 1.4m~1.8m, the blowing lance position is 2m, and the carbon lance position is 1.4m. The position of the oxygen lance refers to th...

Example Embodiment

[0044] Example 2

[0045] According to the method described in Example 1, semi-steel steel is used to smelt the Q235 steel grade; the difference from Example 1 is that the control requirement of the top and bottom combined blowing converter is that the end point carbon content is 0.07% and the end point temperature is 1670°C. The converter tapping process adopts a sliding plate slag blocking system, and the amount of slag is controlled to 29mm, and the converter tapping process does not use aluminum iron deoxidation.

[0046] The processing requirement of the RH process is that the RH inbound temperature is 1610℃, and the carbon deoxidation is directly carried out; the RH inbound cycle is 4.5min, and the deoxidation and alloying are carried out.

Example Embodiment

[0047] Example 3

[0048] According to the method described in Example 1, semi-steel steel is used to smelt the Q235 steel grade; the difference from Example 1 is that the RH enters the station and circulates for 4 minutes to deoxidize and alloy.

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PUM

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Abstract

The invention provides a method for reducing aluminum oxide inclusion in a semi-steel steelmaking casting blank. The method comprises the steps that molten iron pretreatment, top-bottom combined blowing converter smelting, vacuum circulating degassing refining and continuous casting are sequentially conducted, and the casting blank is obtained, wherein carbon deoxidization is conducted at the inlet temperature ranging from 1,595 DEG C to 1,620 DEG C in the vacuum circulating degassing refining process. Compared with the prior art, the method has the advantages that the vacuum circulating degassing refining procedure is conducted in the semi-steel smelting process, deoxidization is conducted by controlling the inlet temperature in the vacuum circulating degassing refining process, aluminum-iron deoxidization does not need to be adopted in the top-bottom combined blowing converter smelting process, and therefore the deoxidization cost is reduced; in addition, by adopting the method, the Al2O3 inclusion in the casting blank can be reduced, and the quality of the casting blank can be improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for reducing alumina inclusions in semi-steelmaking steelmaking slabs. Background technique [0002] Panzhihua Iron and Steel Vanadium Converter adopts semi-steel steelmaking. Since the Si content in semi-steel is traces, the C content is lower than that of molten iron and the heat source is insufficient, so compared with molten iron steelmaking, semi-steel steelmaking needs to add SiO 2 , FeO and Fe 2 o 3 Composite slag, the post-smelting control needs to blow more oxygen to meet the end point temperature control requirements, resulting in low C content and high oxygen activity in the semi-steel steelmaking end point, the average end point oxygen content is 650ppm, and the end point oxygen content is partial high. [0003] The high oxygen content not only increases the consumption of aluminum and iron, increases the production cost, but also causes the Al 2 o 3...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C5/35C21C7/10
CPCC21C5/35C21C7/06C21C7/10
Inventor 陈路曾建华梁新腾陈均
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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