阅读说明：本技术 一种q195m高效防絮流含铝钢开台工艺及含铝钢 (Q195M efficient flocculation-flow-preventing aluminum-containing steel opening process and aluminum-containing steel ) 是由 张典红 刘坤 杨志宁 李勇生 郭志强 何超 刘飞 王洪伟 李永升 于 2021-08-25 设计创作，主要内容包括：本发明公开了一种Q195M高效防絮流含铝钢开台工艺及含铝钢,属于炼钢技术领域,包括：S1、选择生产模式；S2、设置生产工艺流程；S3、炼钢工序：开台Q195M钢种转炉终点,控制在0.06～0.09％,一次倒炉,加硅铝钡脱氧,控制Al小于0.010％；S4、精炼工序：采用双精炼炉模式,炉前配加精炼造渣料,Q195M钢水全氧控制在70±10ppm,钢水开浇温度降低15℃,控制在1610℃；S5、连铸工序：梳理开浇准备工作,使中包停止烘烤到大包开浇的时间控制在2min以内；开台采用“试棒,慢开,缓涨,见液面,调正常”的方法；利用低温快浇,使开台后1炉钢内拉速快速提升到正常拉速。(The invention discloses a Q195M high-efficiency flocculation-preventing aluminum-containing steel opening process and aluminum-containing steel, belonging to the technical field of steel making and comprising the following steps: s1, selecting a production mode; s2, setting a production process flow; s3, a steel-making process: opening a converter of Q195M steel grade at the end point, controlling the end point to be 0.06-0.09%, turning down the converter once, adding silicon, aluminum and barium for deoxidation, and controlling Al to be less than 0.010%; s4, refining: adopting a double refining furnace mode, adding a refining slag-making material in front of the furnace, controlling the total oxygen content of Q195M molten steel at 70 +/-10 ppm, reducing the casting temperature of the molten steel by 15 ℃, and controlling the temperature at 1610 ℃; s5, continuous casting process: carding casting preparation work, and controlling the time from the middle ladle stopping baking to the large ladle casting within 2 min; the method of 'test bar, slow opening, slow expansion, liquid level and normal adjustment' is adopted for opening the platform; and (3) rapidly increasing the pulling speed in the furnace steel 1 after the start of the platform to the normal pulling speed by utilizing low-temperature rapid casting.)

1. An opening process for Q195M high-efficiency anti-flocculation aluminum-containing steel is characterized by at least comprising the following steps:

s1, selecting a production mode: opening a furnace 195M in the 1 st furnace, and pouring aluminum-containing steel after the furnace 2;

s2, setting a production process flow:

s201, adding blast furnace molten iron into a mixer from a molten iron tank, and adding the molten iron into a steel-making ladle after the molten iron has uniform components and temperature in the mixer;

s202, smelting molten iron into molten steel with components and temperature meeting the requirements by using oxygen blown by an oxygen lance, bottom blown argon and a slag-forming material;

s203, reducing the oxygen and sulfur contents of molten steel, removing impurities, improving the purity of the molten steel and finely adjusting components by stirring reducing top slag and bottom-blown argon;

s204, injecting qualified molten steel into a tundish from a steel ladle, shunting and injecting the qualified molten steel into a crystallizer through the tundish, and cooling, straightening and cutting the qualified molten steel into a steel billet with a required fixed size;

s3, setting a steel-making process;

s4, setting a refining process;

s5, continuous casting process: carding casting preparation work, and controlling the time from the middle ladle stopping baking to the large ladle casting within 2 min; the method of 'test bar, slow opening, slow expansion, liquid level and normal adjustment' is adopted for opening the platform; and (3) rapidly increasing the pulling speed in the furnace steel 1 after the start of the platform to the normal pulling speed by utilizing low-temperature rapid casting.

2. The Q195M efficient anti-flocculation-flow aluminum-containing steel opening process according to claim 1, wherein S3 specifically comprises: and (3) opening the end point of the Q195M steel converter, controlling the end point to be 0.06-0.09%, turning down the converter once, adding silicon, aluminum and barium for deoxidation, and controlling the Al content to be less than 0.010%.

3. The Q195M efficient anti-flocculation-flow aluminum-containing steel opening process according to claim 1, wherein S4 specifically comprises: a double-refining furnace mode is adopted, refining slag making materials are added in front of the furnace, the total oxygen content of Q195M molten steel is controlled to be 70 +/-10 ppm, the casting temperature of the molten steel is reduced by 15 ℃, and the temperature is controlled to be 1610 ℃.

4. An aluminum-containing steel, which is prepared by the open bench process of the Q195M high-efficiency anti-flocculation aluminum-containing steel of claim 1.

Technical Field

The invention belongs to the technical field of steelmaking, and particularly relates to a Q195M efficient flocculation-flow-preventing aluminum-containing steel opening process.

Background

In recent years, with continuous adjustment of industrial structures, development of high-aluminum-content cold heading steel is imperative, factors such as poor castability of controlled molten steel, flocculation flow of a water gap and the like, the success rate of continuous casting starting is low, the number of abnormal casting stopping times is large, and the cost is increased. The reasons are that the high-grade cold heading steel has low carbon and silicon contents and high aluminum content, the converter terminal carbon pulling is required to be low, molten steel is easy to be oxidized, the adding amount of aluminum alloy is large, and a large amount of aluminum deoxidation products are generated; the secondary oxidation is serious when the casting is started in continuous casting; in order to avoid the situation that the temperature of molten steel of the casting furnace is controlled to be higher after casting flocculation flow, the casting speed cannot reach the normal casting speed for a long time after casting, and pressure suboxides at a water gap are easy to enrich. Therefore, it is very important to develop a Q195M high-efficiency anti-flocculation-flow aluminum-containing steel open-end process.

Disclosure of Invention

The invention provides a Q195M efficient anti-flocculation-flow aluminum-containing steel opening process and aluminum-containing steel for solving the technical problems in the prior art.

The first purpose of the invention is to provide a Q195M high-efficiency anti-flocculation-flow aluminum-containing steel open bench process, which at least comprises the following steps:

s1, selecting a production mode: opening a furnace 195M at the 1 st, and pouring aluminum-containing steel after the furnace 2;

s2, the production process flow is as follows: the method comprises the following steps of a blast furnace mixer (blast furnace molten iron is added into the blast furnace mixer from a molten iron tank, the molten iron is added into a steel-making ladle after the components and the temperature are uniform in the blast furnace mixer, a top-bottom combined blown converter (molten iron is smelted into molten steel with the components and the temperature meeting the requirements by oxygen, bottom-blown argon and slag making materials blown by an oxygen lance), a double-LF refining furnace (molten steel is stirred by reducing top slag and bottom-blown argon to reduce the oxygen and sulfur contents of the molten steel, remove impurities, improve the purity of the molten steel and carry out component fine adjustment), and a square billet continuous casting machine (qualified molten steel is injected into a tundish from the ladle, is shunted and injected into a crystallizer through the tundish, and is cooled, straightened and cut into steel billets with the required size);

s3, a steel-making process: opening a converter of Q195M steel grade at the end point, controlling the end point to be 0.06-0.09%, turning down the converter once, adding silicon, aluminum and barium for deoxidation, and controlling Al to be less than 0.010%;

s4, refining: adopting a double refining furnace mode, adding a refining slag-making material in front of the furnace, controlling the total oxygen content of Q195M molten steel at 70 +/-10 ppm, reducing the casting temperature of the molten steel by 15 ℃, and controlling the temperature at 1610 ℃;

s5, continuous casting process: carding casting preparation work, and controlling the time from the middle ladle stopping baking to the large ladle casting within 2 min; the method of 'test bar, slow opening, slow expansion, liquid level and normal adjustment' is adopted for opening the platform; and (3) rapidly increasing the pulling speed in the furnace steel 1 after the start of the platform to the normal pulling speed by utilizing low-temperature rapid casting.

The second purpose of the invention is to provide the aluminum-containing steel which is prepared by the open bench process of the Q195M high-efficiency anti-flocculation aluminum-containing steel.

The invention has the advantages and positive effects that:

aiming at the low success rate of opening the high-aluminum steel, the invention controls the oxygen content of the Q195M molten steel by adopting the Q195M opening technology, reduces the temperature drop of the opened molten steel, reduces the temperature of the opened molten steel, leads the steel in a furnace 1 to quickly reach the normal drawing speed and ensures the production of the high-aluminum steel;

the success rate of opening the high aluminum-containing steel and the number of continuous casting furnaces are greatly improved, and the cost rise caused by production interruption is avoided, so that the manufacturing cost of the high aluminum-containing steel is reduced, and the market competitiveness is improved.

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following examples are illustrated and described in detail as follows:

the technical scheme of the invention is as follows:

a Q195M efficient anti-flocculation-flow aluminum-containing steel starting process, (1) Q195M steel component design is carried out according to the starting molten steel requirement, the characteristic of low-aluminum-content molten steel is utilized, deoxidation products are reduced through a converter high-carbon-drawing and double-slag-blocking technology, and the Q195M molten steel technology is accurately controlled by a refining furnace to improve the castability of the molten steel. (2) And a low-temperature pouring technology is adopted. By optimizing the production organization mode, the preparation work before the casting is combed, the casting preparation time is shortened, the temperature drop of the tundish is reduced, and the temperature of the tundish molten steel is ensured. (3) The casting method of 'test bar, slow opening, slow expansion, liquid level, and normal adjustment' is adopted, and the internal pulling speed of the furnace steel is increased to the normal pulling speed after the platform is opened 1.

This application carries out Q195M steel composition design according to the molten steel demand of opening a platform, and control Q195M molten steel oxygen content reduces the molten steel temperature of opening a platform, makes in 1 stove steel reach normal drawing speed fast, guarantees the production of high-alumina steel:

the method is used for designing the composition of Q195M steel according to the requirement of open-platform molten steel; starting a furnace 1 from low-aluminum steel (Q195M), reducing the temperature of molten steel for starting the furnace by 15 ℃ so as to quickly reach normal pulling speed after starting the furnace, and starting a furnace 2 to produce high-aluminum steel;

the results obtained were: the success rate of starting the high-aluminum-content steel is 100%, and the abnormal casting stop is zero. The process control level is improved, and the production cost is reduced.

The method comprises the following specific steps:

(1) the production mode is as follows: furnace 1 195M + aluminum-containing steel (such as ML08 Al)

(2) The production process flow comprises: blast furnace mixer → top-bottom combined blown converter → double LF refining furnace → billet caster.

(3) A steel making process: and (3) opening the end point of the Q195M steel converter, controlling the end point to be 0.06-0.09%, strictly prohibiting the complementary blowing operation by one-time converter reversing, reducing the oxidability of molten steel, adding silicon, aluminum and barium for deoxidation, controlling Al to be less than 0.010%, reducing deoxidation products, and preventing the molten steel from being too low.

(4) A refining procedure: the double-refining furnace mode is adopted, the slag is rapidly formed (adding refined slag-making materials in front of the furnace), the deoxidation and inclusion removal time is ensured, the molten steel Q195M is controlled to be 70 +/-10 ppm, the molten steel casting temperature is reduced by 15 ℃, and the temperature is controlled to be 1610 ℃.

(5) And (3) continuous casting process: carding casting preparation work, and controlling the time from the middle ladle stopping baking to the large ladle casting within 2 min; the method of 'test bar, slow opening, slow expansion, liquid level and normal adjustment' is adopted for opening the platform. And (3) rapidly increasing the pulling speed in the furnace steel 1 after the start of the platform to the normal pulling speed by utilizing low-temperature rapid casting.

The aluminum-containing steel is prepared by the open bench process of the Q195M high-efficiency anti-flocculation aluminum-containing steel.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.