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Method for alloying ultra-low carbon and degassed steel titanium in RH furnace

An ultra-low carbon, titanium alloy technology, used in the manufacture of converters and other directions, can solve the problems of overoxidation of molten steel at the end, high nitrogen content of the molten steel at the end, and insufficient temperature at the end of the converter, so as to achieve stable and controlled nitrogen content, small fluctuation range, The effect of meeting process quality control requirements

Inactive Publication Date: 2021-10-22
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xichang Steel Vanadium semi-steel smelting degassed (plate) high-grade steel represented by automotive panel IF steel and X80 compared with other domestic factories, affected by the heat source of the semi-steel into the furnace, the temperature at the end point of the converter is insufficient, which is likely to cause the end point The peroxidation of molten steel leads to high nitrogen content in the end point of molten steel

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0046] Pangang Group Xichang Steel and Vanadium Co., Ltd. steelworks smelting ultra-low carbon phosphorus-strengthened high-manganese steel for a furnace, RH arrival station molten steel temperature 1630-1640℃, [C]%: 0.02%-0.05%, [O] in the steel 500~600ppm, after LD blowing, LF furnace process temperature and rhythm adjustment, enter the RH furnace process for treatment, the service life of the RH vacuum chamber insertion tube is in the early and mid-term, and the service life (use times) ≤ 50 times (cumulative use time ≤ 1000 minutes) The RH treatment time of this steel type is about 31 minutes per furnace; the specific control situation: when the steel type RH molten steel is treated with phosphorus-ferroalloy and manganese-ferroalloy for phosphorus and manganese alloying, and the decarburization treatment cycle time lasts to about At 16-18 minutes (final decarburization), measure the temperature and oxygen of the molten steel, add aluminum particles for final deoxidation al...

Embodiment 2

[0048] Xichang Steel and Vanadium Co., Ltd. of Panzhihua Iron and Steel Group smelted a furnace of IF series ultra-low carbon steel. The temperature of molten steel at the RH station was 1630~1650℃, [C]%: 0.03%~0.04%, and [O] in steel was 500~ 700ppm, after LD blowing, LF furnace process temperature and rhythm adjustment, it is processed in RH furnace process, the service life of the RH vacuum chamber insertion tube is in the early and mid-term, and the service life (use times) ≤ 50 times (cumulative use time ≤ 1000 minutes), The RH treatment time of this steel type is about 31 minutes per furnace; the specific control situation: when the steel type RH molten steel is treated with ferromanganese alloy for manganese alloying, and the decarburization treatment cycle time lasts to about 16-18 minutes ( Decarburization final), at this time, temperature measurement and oxygen determination are performed on molten steel, and aluminum particles are added for final deoxidation alloying...

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Abstract

The invention provides a method for alloying ultra-low carbon and degassed steel titanium in an RH furnace, which comprises LD-LF-RH-CC which is carried out in sequence, and comprises the following steps: in an LD stage, reducing converter blowing carbon catch to end point nitrogen increase control; in a RH stage, conducting flaw detection is on a weld joint at the butt welding position of a vacuum chamber body and an insertion pipe steel structure through a permeation method, and the vacuum chamber and the insertion pipe steel structure are connected in an inserted mode; and carrying out titanium alloying by adopting sponge titanium alloy. According to the method of the invention, the nitrogen increasing amount of each step is strictly controlled, so that the phenomenon that the nitrogen content of part of molten steel in heat is too high due to the nitrogen contained in the alloy is restrained, the nitrogen increasing amount in the RH process is reduced to be within 2 * 10 <-6 > from the average of 6 * 10 <-6 > or above, and the nitrogen increasing amount is stably controlled to be 2 * 10 <-6 > or below; and for automobile panel IF steel, after RH treatment, the nitrogen content in the degassed (plate) high-grade steel represented by X80 is stably controlled, and the process quality control requirement is completely met.

Description

technical field [0001] The invention relates to the technical field of vanadium-containing semi-steel smelting, in particular to a method for titanium alloying of ultra-low carbon and degassed steel in an RH furnace. Background technique [0002] For automobile panel IF steel and degassed (plate) high-grade steel represented by X80, nitrogen is a harmful element, which will reduce the plasticity and impact toughness of steel, and can cause cold and brittle steel like phosphorus ; At the same time, nitrogen will also form nitride inclusions with titanium, aluminum and other elements in the steel, which will cause the deterioration of the surface quality of the steel and reduce the yield. With the increasing requirements for steel quality, how to control the nitrogen content in steel to a lower level has become one of the focuses of attention. The degassed (plate) high-grade steel represented by automotive panel IF steel and X80 generally requires the nitrogen content of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/00C21C5/32C22C33/06
CPCC21C7/10C21C7/0006C21C5/32C22C33/06C21C2007/0093
Inventor 王军喻林杨晓东卓钧邱伟黄汝铿
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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