CN114381574B - Control method of high titanium steel inclusions, high titanium steel and preparation method thereof - Google Patents
Control method of high titanium steel inclusions, high titanium steel and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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Abstract
The invention belongs to the technical field of steel smelting, and relates to a control method of inclusions in high titanium steel, the high titanium steel and a preparation method of the high titanium steel. The method for controlling the inclusions in the high titanium steel comprises the following steps: (1) after AOD blowing is finished, silicon-aluminum composite deoxidation is adopted; (2) After slagging off, adding aluminum pills, lime and fluorite into molten steel, and stirring by bottom blowing argon; (3) Adding a titanium alloy block for titanium alloying, wherein the addition amount of the titanium alloy block is calculated according to the yield of 65-80%, and continuously blowing argon at the bottom after titanium alloying; (4) tapping and keeping AOD bottom blowing argon; (5) And LF is used for feeding pure calcium lines or calcium silicate blocks after adjusting the temperature of molten steel components and slag components. The control method of the high titanium steel inclusion avoids the defects of nozzle nodulation, fish formation of a continuous casting crystallizer and inclusion or flaw detection incompatibility on the product surface caused by the massive precipitation of TiN.
Description
Technical Field
The invention belongs to the technical field of steel smelting, relates to a high titanium steel inclusion control method, high titanium steel and a preparation method thereof, and particularly relates to high titanium austenitic stainless steel and an inclusion control method thereof.
Background
High titanium austenitic stainless steels typically have titanium contents greater than 0.3%, including 316Ti, high titanium 321, iron-nickel based alloys, and the like. Under the condition of high titanium content, titanium oxide and TiN inclusion are easily formed in steel, and the steel has the characteristics of high melting point and easy aggregation, so that continuous casting nozzle nodulation, crystallizer 'fish knot' and large casting blank inclusion are caused, and finally, cold plate surface defects and profile flaw detection are not suitable.
The existing titanium-containing steel smelting technology such as CN201910878406.2, CN201911109355.3, CN201410127821.1, CN201510619738.0 and the like adopts LF or VOD to perform deoxidation and titanium alloying, and is not beneficial to effectively removing large titanium-containing inclusions due to limited refining time.
The prior art mainly aims at the steel grade with lower titanium content, tiN is separated out in the continuous casting solidification process, and the production quality problem cannot be caused; when the titanium content is higher, the TiN volume is increased, tiN can be separated out from the molten steel at the smelting temperature, and the molten steel is easy to aggregate to form large inclusions. Therefore, the high titanium steel has higher requirement on N, and the nitrogen increasing link needs to be strictly controlled.
Disclosure of Invention
The invention aims to provide a control method of inclusions in high titanium steel, the high titanium steel and a preparation method thereof aiming at the defects of the prior art.
Specifically, in a first aspect, the invention provides a method for controlling inclusions in high titanium steel, which comprises the following steps:
(1) After AOD blowing is finished, silicon-aluminum composite deoxidation is adopted;
(2) After slagging off, adding aluminum pills, lime and fluorite into the molten steel, and blowing argon gas at the bottom for stirring;
(3) Adding a titanium alloy block for titanium alloying, wherein the addition amount of the titanium alloy block is calculated according to the yield of 65-80%, and continuously blowing argon at the bottom after titanium alloying;
(4) Tapping and keeping AOD bottom blowing argon;
(5) And LF is used for feeding pure calcium lines or calcium silicate blocks after adjusting the temperature of molten steel components and slag components.
In the method for controlling the inclusions in the high-titanium steel, in the step (1), after the silicon-aluminum composite deoxidation is adopted, the Al content in the molten steel is controlled to be 0.005-0.015wt%.
According to the control method of the high titanium steel inclusion, the adding amount of the aluminum shot is 3-5kg/t steel, the adding amount of the lime is 10-15kg/t steel, and the adding amount of the fluorite is 5-8kg/t steel.
In the method for controlling the inclusions in the high titanium steel, in the step (2), the flow of bottom-blown argon is 0.4-0.8 Nm/ton of steel 3 And/min, stirring for 5-8min.
In the method for controlling inclusions in high titanium steel, the titanium alloy block includes: 92-95wt% of Ti, 5-8wt% of Al, less than or equal to 0.01wt% of N and less than or equal to 0.01wt% of O.
In the method for controlling the inclusions in the high titanium steel, after titanium alloying, the flow of the bottom blowing argon is 0.4-0.8 Nm/ton steel 3 And/min, stirring for 3-5min.
According to the control method of the inclusions in the high titanium steel, the tapping speed of the steel is 3-6t/s.
According to the control method of the high titanium steel inclusion, the feeding amount of the pure calcium wire is 2-2.5m/t steel, and the feeding amount of the calcium silicon block is 0.4-0.6kg/t steel.
On the other hand, the invention provides a preparation method of high titanium steel, which comprises EAF or converter plus intermediate frequency furnace-AOD-LF-continuous casting, and in the AOD and LF smelting process, the inclusion control method of the high titanium steel is adopted to control the inclusions.
In another aspect, the invention also provides high titanium steel prepared by the preparation method of the high titanium steel.
The technical scheme of the invention has the following beneficial effects:
(1) Aiming at the EAF or converter plus intermediate frequency furnace-AOD-LF-continuous casting process flow, the invention adopts a deoxidation mode of silicon-aluminum composite deoxidation-Al deep deoxidation-titanium alloying, fully reduces the residual oxygen and impurities in the steel before titanium alloying, adjusts the slag system into a low-oxidizing slag system, reduces the burning loss and oxidation of titanium after titanium alloying, and improves the yield of the titanium; and reduce CaO & TiO 2 Generating similar impurities;
(2) Compared with the prior art of titanium alloying in an LF furnace, the invention advances the titanium alloying process to AOD, is beneficial to fully utilizing the stirring effect of AOD and enhancing the steel slag reaction and the floating removal of impurities; the LF has enough time to adjust the temperature and components, or the AOD direct-upward continuous casting process can be realized, so that the production efficiency is improved;
(3) A large number of analysis researches show that the nitrogen increase amount of the high-titanium steel smelting process is about 40ppm mainly in the titanium alloying process after AOD reduction and the AOD tapping process; according to the invention, the oxygen and nitrogen contents in the titanium alloy are strictly controlled, and the argon flow stirring process in the deoxidation and alloying processes is adopted, so that the steel flow speed and the gas protection in the tapping process are enhanced, the nitrogen increase is reduced to be within 15ppm, and the superheat degree of a continuous casting tundish is improved, thereby avoiding the defects of nozzle nodulation, continuous casting crystallizer 'fish' and product surface inclusion or flaw detection failure caused by the massive precipitation of TiN.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The terms "preferred", "more preferred", and the like in the present invention refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
Specifically, in a first aspect, the invention provides a method for controlling inclusions in high titanium steel, comprising:
(1) After AOD blowing is finished, silicon-aluminum composite deoxidation is adopted;
(2) After slagging off, adding aluminum pills, lime and fluorite into molten steel, and stirring by bottom blowing argon;
(3) Adding a titanium alloy block for titanium alloying, wherein the addition amount of the titanium alloy block is calculated according to the yield of 65-80%, and continuously blowing argon at the bottom after titanium alloying;
(4) Tapping and keeping AOD bottom blowing argon protection;
(5) And LF is used for feeding pure calcium lines or calcium silicate blocks after adjusting the temperature of molten steel components and slag components.
According to the method for controlling the inclusions in the high-titanium steel, the technical scheme of AOD aluminum deep deoxidation, AOD titanium alloying, AOD steel tapping nitrogen increase prevention and LF weak calcium treatment is adopted, so that the yield of titanium is improved, and the problems of nozzle nodulation and product quality caused by the generation of titanium-containing oxides and TiN inclusions are solved.
In some preferred embodiments, the method for controlling inclusions in high titanium steel according to the present invention comprises:
(1) And (4) after AOD blowing is finished, silicon-aluminum composite deoxidation is adopted.
Preferably, after the silicon-aluminum composite deoxidation is adopted, the Al content in the molten steel is controlled to be 0.005-0.015wt%, so that the composite deoxidation effect is achieved, the oxygen content is reduced, and the aluminum deep deoxidation pressure is reduced.
(2) After slagging off, adding aluminum pellets, lime and fluorite into the molten steel, and stirring by blowing argon at the bottom.
Preferably, the slag skimming step includes: and pouring the furnace body, removing more than 90% of furnace slag, and keeping bottom blowing argon protection in the process.
Further preferably, the adding amount of the aluminum pellets is 3-5kg/t steel, the adding amount of the lime is 10-15kg/t steel, and the adding amount of the fluorite is 5-8kg/t steel, so that the oxidation burning loss of titanium is reduced through deep deoxidation of aluminum.
Preferably, the flow rate of the bottom blowing argon is 0.4-0.8 Nm/ton steel 3 And/min, stirring for 5-8min.
(3) Adding titanium alloy blocks to perform titanium alloying, wherein the addition amount of the titanium alloy blocks is calculated according to the yield of 65-80%, and continuously blowing argon at the bottom after titanium alloying.
Preferably, the titanium alloy block comprises, in weight percent: 92-95wt% of Ti, 5-8wt% of Al, less than or equal to 0.01wt% of N and less than or equal to 0.01wt% of O.
Preferably, after titanium alloying, the flow of the bottom-blown argon is 0.4-0.8 Nm/ton steel 3 And/min, stirring for 3-5min.
(4) Tapping and keeping AOD bottom blowing argon protection.
Preferably, during the tapping process, AOD bottom blowing argon protection is kept, the tapping speed is controlled according to 3-6t/s, the furnace slag is kept to cover most of molten steel all the time, and a calcium-silicon covering agent is added into the steel ladle, so that the molten steel is prevented from being exposed and nitrogen is prevented from being increased, and the steel ladle needs to be filled with argon in advance for emptying.
(5) And after the LF adjusts the temperature of molten steel components and slag components, feeding pure calcium lines or calcium silicate blocks.
Preferably, the feeding amount of the pure calcium wire is 2-2.5m/t steel, and the feeding amount of the calcium silicon block is 0.4-0.6kg/t steel.
The process and specific technical parameters adopted in the process of smelting the high titanium steel are carried out according to the prior art except for the specific limitations of the invention, and the invention is not described in detail herein.
On the other hand, the invention provides a preparation method of high titanium steel, which comprises the steps of EAF or converter and intermediate frequency furnace-AOD-LF-continuous casting, and in the AOD and LF smelting processes, the inclusion control method of the high titanium steel is adopted to control inclusions.
Preferably, the superheat degree of the tundish in continuous casting is 45-55 ℃, so that the superheat degree of the tundish is improved, and the precipitation of TiN in the continuous casting process is reduced.
In another aspect, the invention provides a high titanium steel, which is prepared by the preparation method of the high titanium steel.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions.
(1) Steel grade: 321 stainless steel (Ti content 0.3-0.5 wt%)
(2) The process flow comprises the following steps: EAF or converter plus intermediate frequency furnace-AOD-LF-continuous casting
(3) The implementation effect is as follows:
(4) The specific implementation method comprises the following steps:
example 1
I, after AOD blowing is finished, silicon-aluminum composite deoxidation is adopted, and the Al content is controlled to be 0.005wt%;
II, dumping the furnace body, removing more than 90% of furnace slag, and keeping bottom blowing argon protection in the process;
III adding 3kg of aluminum shot per ton of steel, 10kg of lime per ton of steel and 8kg of fluorite per ton of steel, wherein the flow of bottom-blowing argon is 0.4 Nm/m for each ton of steel 3 Stirring for 5min;
IV, adding a titanium alloy block into the AOD for titanium alloying, wherein the titanium alloy block comprises the following components:ti:92%, al:7.8%, N: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent and the balance of inevitable impurities; after titanium alloying, the flow of bottom-blown argon is continuously adopted as 0.4Nm of each ton of steel 3 Stirring for 3min;
v, during the tapping process, AOD bottom blowing argon protection is kept, the tapping speed is controlled according to 3t/s, most of molten steel is always covered by slag, and a calcium-silicon covering agent is added into a steel ladle, so that the molten steel is prevented from being exposed and nitrogen is increased, and the steel ladle needs to be filled with argon in advance for emptying;
VI LF is fed into pure calcium wire 2m/t steel after adjusting the temperature of the molten steel component and the slag component;
and VII, controlling the superheat degree of the continuous casting tundish at 45 ℃.
Example 2
I, after AOD blowing is finished, silicon-aluminum composite deoxidation is adopted, and the Al content is controlled to be 0.015wt%;
II, dumping the furnace body, removing more than 90% of furnace slag, and keeping bottom blowing argon protection in the process;
III adding 4kg of aluminum shot per ton of steel, 13kg of lime per ton of steel and 7kg of fluorite per ton of steel, wherein the flow of bottom-blowing argon is 0.6 Nm/m for each ton of steel 3 Stirring for 6min;
IV, adding a titanium alloy block into the AOD for titanium alloying, wherein the titanium alloy block comprises the following components: ti:92%, al:7.8%, N: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent of the balance of inevitable impurities; after titanium alloying, the flow of bottom-blown argon is continuously adopted as 0.6Nm of each ton of steel 3 Stirring for 5min;
v, during the tapping process, AOD bottom blowing argon protection is kept, the tapping speed is controlled according to 6t/s, most of molten steel is always covered by slag, and a calcium-silicon covering agent is added into a steel ladle, so that the molten steel is prevented from being exposed and increasing nitrogen, and the steel ladle needs to be filled with argon in advance for emptying;
VI LF, after adjusting the temperature of the molten steel components and the slag components, feeding pure calcium line 2.5m/t steel;
VII controlling the superheat degree of a continuous casting tundish at 50 ℃.
Example 3
I, after AOD blowing is finished, silicon-aluminum composite deoxidation is adopted, and the Al content is controlled to be 0.008wt%;
II, dumping the furnace body, removing more than 90% of furnace slag, and keeping bottom blowing argon protection in the process;
III adding 5kg of aluminum shot ton steel, 15kg of lime ton steel and 5kg of fluorite ton steel, wherein the flow of bottom-blown argon is 0.6 Nm/ton steel 3 Stirring for 8min;
IV AOD is added into the titanium alloy block for titanium alloying, the addition is calculated according to the yield of 65-80%, and the titanium alloy block comprises the following components: ti:94%, al:5.9%, N: less than or equal to 0.01 percent, O: less than or equal to 0.01 percent, and the balance of inevitable impurities; after titanium alloying, the flow of bottom-blown argon is continuously adopted as 0.6Nm of each ton of steel 3 Stirring for 5min;
v, during the tapping process, AOD bottom blowing argon protection is kept, the tapping speed is controlled according to 5t/s, most of molten steel is always covered by slag, and a calcium-silicon covering agent is added into a steel ladle, so that the molten steel is prevented from being exposed and increasing nitrogen, and the steel ladle needs to be filled with argon in advance for emptying;
VI LF is fed into pure calcium wire 2m/t steel after adjusting the temperature of the molten steel component and the slag component;
VII controlling the superheat degree of a continuous casting tundish at 55 ℃.
Comparative example
I, after AOD blowing is finished, silicon-aluminum composite deoxidation is adopted, and the Al content of the tapped steel is controlled to be 0.015wt%;
II LF is added with ferrotitanium alloy for titanium alloying, and the components of the titanium alloy are Ti:72 to 75 percent; o:0.3 percent; n:0.2% and the balance of Fe and inevitable impurities. After titanium alloying, continuously blowing argon gas from the bottom and strongly stirring for 5min;
III, after adjusting the temperature of molten steel components and slag components, feeding pure calcium line 2m/t steel, and weakly stirring for 15min;
VI, controlling the superheat degree of a continuous casting tundish at 40 ℃.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (4)
1. A method for controlling inclusions in high titanium steel is characterized by comprising the following steps:
(1) After AOD blowing is finished, silicon-aluminum composite deoxidation is adopted, and after the silicon-aluminum composite deoxidation is adopted, the Al content in molten steel is controlled to be 0.005-0.015 wt%;
(2) After slagging off, adding aluminum pills, lime and fluorite into molten steel, and stirring by bottom blowing argon; wherein the flow rate of bottom-blown argon is 0.4-0.8 Nm/ton steel 3 Stirring for 5-8min;
(3) Adding titanium alloy blocks for titanium alloying, wherein the addition amount of the titanium alloy blocks is calculated according to 65-80% yield, continuously blowing argon at the bottom after titanium alloying, and the flow rate of the argon is 0.4-0.8Nm per ton of steel 3 Stirring for 3-5min; wherein the titanium alloy block includes: ti92-95 wt%, al5-8wt%, N is less than or equal to 0.01wt%, O is less than or equal to 0.01 wt%;
(4) Tapping according to the tapping speed of 3-6t/s and keeping AOD bottom blowing argon;
(5) And LF is used for feeding pure calcium lines or calcium silicate blocks after adjusting the temperature of molten steel components and slag components.
2. The method for controlling inclusions in high titanium steel according to claim 1, wherein the amount of the aluminum shot added is 3 to 5kg/t steel, the amount of the lime added is 10 to 15kg/t steel, and the amount of the fluorite added is 5 to 8kg/t steel.
3. The method for controlling inclusions in high titanium steel according to claim 1, wherein the feeding amount of the pure calcium wire is 2 to 2.5m/t steel, and the feeding amount of the calcium silicon block is 0.4 to 0.6kg/t steel.
4. A preparation method of high titanium steel, which comprises EAF or converter + intermediate frequency furnace-AOD-LF-continuous casting, and is characterized in that the inclusion is controlled by the method for controlling the inclusion of the high titanium steel according to any one of claims 1 to 3 in the AOD and LF smelting process.
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| CN103225008B (en) * | 2013-04-22 | 2014-07-30 | 山西太钢不锈钢股份有限公司 | Method for preventing caking in crystallizer and nozzle clogging during process for smelting titanium-containing stainless steel |
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