CN114369700B - Method for controlling inclusions in stainless steel microfilament, stainless steel microfilament and preparation method thereof - Google Patents
Method for controlling inclusions in stainless steel microfilament, stainless steel microfilament 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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/076—Use of slags or fluxes as treating agents
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention belongs to the technical field of steel smelting, and relates to a method for controlling inclusions in stainless steel microwires, the stainless steel microwires and a preparation method thereof. The method for controlling the stainless steel microfilament inclusion comprises the following steps: (1) Adopting low-aluminum ferrosilicon to reduce in a VOD or AOD reduction period, adjusting the alkalinity of the slag to be more than or equal to 2.2, and adding slag containing alkali metal oxide to adjust the fluidity of the slag; (2) After VOD reduction period or AOD slag skimming, adding synthetic slag and slag charge containing alkali metal oxide, adjusting the alkalinity of the slag to 1.6-2.0, and making the content of the alkali metal oxide in the slag 2-10wt% and the content of Al in steel less than 0.005wt%. The method for controlling the inclusions in the stainless steel microwire solves the problem of wire breakage of the stainless steel microwire due to cleanliness or inclusion control.
Description
Technical Field
The invention belongs to the technical field of steel smelting, relates to a smelting method of stainless steel microfilaments, and particularly relates to a control method of inclusions in the stainless steel microfilaments, the stainless steel microfilaments and a preparation method thereof.
Background
The diameter of the stainless steel microfilament is less than 50 mu m and even less than 20 mu m, and the stainless steel microfilament is widely applied to the fields of chemical industry, petroleum, aerospace, military industry and the like and used for manufacturing shielding clothes, body armor, filter screens and the like. In order to ensure that the stainless steel microfilament has enough mechanical strength and corrosion resistance, strict upper limit control requirements are provided for the T.O content and the S content. The inclusions or hard spots with the diameter of more than 5 mu m can cause wire breakage in the cold drawing process, and compared with cord steel, cutting wires, spring steel and the like, the microwire stainless steel has higher requirements on cleanliness, particularly inclusion plasticity.
Chinese patent applications 200480023513.9 and 201810089590.8 disclose the use of potassium silicon (KSi) alloys, lithium silicon (LiSi) alloys or Li by adding to steel 2 CO 3 So as to reduce the melting point of the inclusions, improve the plasticity and reduce the broken wire rate. However, in large-scale industrial production processes, potassium silicon (KSi) alloys, lithium silicon (LiSi) alloys or Li 2 CO 3 Whether the molten steel can be smoothly added needs to be examined; the Si content is increased after the addition, which exceeds the component requirements of certain steel grades; and does not involve a furnaceThe influence of slag on inclusions.
The Chinese invention patents with the application numbers of 201610002220.7 and 202010691928.4 provide a method for improving the plasticity of inclusions, realizes the plasticity of the inclusions by controlling the Al content in the alloy, adjusting the AOD, the alkalinity of LF slag and the like, and solves the problem that the inclusions influence the surface quality of stainless steel cold-rolled sheet products. This method suppresses Al 2 O 3 The type of the inclusion is MnO-SiO with low melting point 2 -Al 2 O 3 、SiO 2 -CaO-Al 2 O 3 MgO, but this method does not guarantee that the melting point of most inclusions is below 1300 ℃; when the alkalinity is lower than 1.6, T.O and S in steel are increased, and the cleanliness is deteriorated. Therefore, in order to meet the requirements of the microwire stainless steel, further improvement of cleanliness and inclusion plasticity is required.
In addition, the melting point of silica or quartz sand reaches 1750 ℃, the silica or quartz sand is difficult to be rapidly melted and mixed with the slag, the slagging speed is slow, slag mixing through the silica or quartz sand needs a long time of stirring and heating the steel slag, and particularly, the slag with target alkalinity and uniformity is difficult to be rapidly formed during short-process smelting.
Disclosure of Invention
The invention aims to provide a method for controlling inclusions in stainless steel microwires, a stainless steel microwire and a preparation method thereof aiming at the defects of the prior art.
Specifically, the method for controlling the stainless steel microfilament inclusion comprises the following steps:
(1) Adopting low-aluminum ferrosilicon to reduce in a VOD or AOD reduction period, adjusting the alkalinity of the slag to be more than or equal to 2.2, and adding slag containing alkali metal oxide to adjust the fluidity of the slag;
(2) After VOD reduction period or AOD slag skimming, adding synthetic slag and slag charge containing alkali metal oxide, adjusting the alkalinity of the slag to 1.6-2.0, and making the content of the alkali metal oxide in the slag 2-10wt% and the content of Al in steel less than 0.005wt%.
According to the method for controlling the stainless steel microfilament inclusions, the synthetic slag comprises the following components in percentage by weight: 32% -36% of SiO 2 ：48％-54％，MgO：10％-20％。
According to the method for controlling the stainless steel microfilament inclusions, the granularity of the synthetic slag is 3-30mm.
In the method for controlling the stainless steel microfilament inclusion, the alkali metal oxide-containing slag comprises glass and/or alkali metal silicate.
In the method for controlling the inclusions in the stainless steel microfilament, the content of Al and Ti in the low-aluminum ferrosilicon is less than 0.8wt%.
According to the method for controlling the stainless steel microfilament inclusions, the glass comprises the following components in percentage by weight: 10% -20% of SiO 2 ：65％-80％，M 2 O:10% -20%; wherein M is an alkali metal element, including K, na and Li.
In the method for controlling the inclusions in the stainless steel microfilament, the alkali metal silicate comprises SiO 2 ：45％-60％，M 2 O:40% -55%; wherein M is an alkali metal element, including K, na and Li.
The preparation method of the stainless steel microfilament comprises smelting, continuous casting, rolling and wire drawing, and is characterized in that the inclusion in the stainless steel microfilament is controlled by adopting the control method of the stainless steel microfilament inclusion in the smelting.
According to the preparation method of the stainless steel microfilament, the smelting process flow is as follows: molten iron pretreatment, converter, slagging station, VOD-LF, or, EAF or BOF + intermediate frequency furnace, AOD-LTS-LF.
The invention also provides a stainless steel microfilament which is prepared by the preparation method of the stainless steel microfilament.
Compared with Chinese patent with the application numbers of 201610002220.7 and 202010691928.4, the method for controlling the stainless steel microfilament inclusion has the following beneficial effects:
(1) Compared with a common stainless steel cold plate, the microwire stainless steel has higher requirement on inclusions, the inclusions in the stainless steel microwire contain a certain amount of alkali metal oxide, the melting point of the inclusions can be reduced by about 100 ℃ when the content of the alkali metal oxide is increased by 5%, the plasticity of the inclusions is better, and the requirement of the microwire stainless steel on the inclusions is met;
(2) A large number of theories and experimental researches show that the alkalinity of the slag is lower than 1.6, which can cause the T.O and S in the steel to be greatly increased and the cleanliness to be deteriorated, and the invention ensures the plasticity of the inclusions under the conditions of less oxygenation and sulfur increase;
(3) The invention has more environmental protection property by adopting the alkali metal oxide to replace fluorite, and the synthetic slag replaces silica and quartz sand, thereby reducing the melting point of slag materials, having better slag melting effect and quicker slag forming speed, meeting the refining requirement without heating the LF furnace, and improving the production efficiency and the ton steel benefit; on the other hand, the synthetic slag contains a certain amount of MgO, so that the corrosion to the refractory material of the furnace lining is reduced.
Compared with Chinese patent with the application numbers of 200480023513.9 and 201810089590.8, the method for controlling the stainless steel microfilament inclusion has the following beneficial effects:
(1) The inclusion is regulated and controlled by the slag instead of adding alloy, the adding process is more controllable and simple, the method is suitable for various process routes, and the method is easier to popularize in large-scale industrial production;
(2) The invention can not cause the obvious change of the components of the molten steel, can not increase the silicon content in the steel, and meets the production requirement.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 shows the morphology and distribution of inclusions in a wire rod of 10mm diameter in example 3 along the rolling direction;
FIG. 2 is a graph showing the morphology and distribution of inclusions in a steel section along the cold drawing direction when cold drawn to 1mm in example 3.
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 principle of the method of the invention is as follows: (1) in the reduction period, a high-alkalinity slag system is adopted to enhance deoxidation and desulfurization, and the fluidity of slag is improved through alkali metal oxide slag, so that insufficient reduction and formation of large-size inclusions are avoided, and the purity of steel is ensured; (2) the alkalinity and the oxidability of the slag are adjusted by the synthetic slag and the slag charge of the alkali metal oxide, so that the MgO-Al with high melting point for promoting the inclusion to be mixed with the slag under the conditions of less oxygenation and sulfur increase 2 O 3 And SiO 2 -Al 2 O 3 CaO-MgO to low melting SiO 2 -MnO-M 2 O and SiO 2 -CaO-M 2 O transformation; due to the containing of a certain amount of M 2 O, compared with silicate, the melting point of the inclusion is obviously reduced; (3) the lower the melting point of the inclusion in the hot rolling process, the easier the inclusion is softened, the plastic elongation is generated along with the rolling deformation of the steel matrix, the inclusion is broken into point-shaped inclusions with the size less than 5 mu m in the cold drawing process, and the cold drawing broken wire is reduced because no hard point in the inclusion does not influence the performance of the steel matrix.
Specifically, in a first aspect, the invention provides a method for controlling stainless steel microwire inclusions, which comprises the following steps:
(1) Adopting low-aluminum ferrosilicon to reduce in a VOD or AOD reduction period, adjusting the alkalinity of the slag to be more than or equal to 2.2, and adding slag containing alkali metal oxide to adjust the fluidity of the slag;
(2) After VOD reduction period or AOD slag skimming, synthetic slag and slag charge containing alkali metal oxide are added, the alkalinity of the slag is adjusted to 1.6 to 2.0, the content of the alkali metal oxide in the slag is 2 to 10 weight percent, and the content of Al in steel is lower than 0.005 weight percent.
The method for controlling the stainless steel microfilament inclusion of the invention adopts synthetic slag and slag containing alkali metal oxide to adjust the alkalinity and the components of the slag to realize the plasticizing control of the inclusion after fully desulfurizing and deoxidizing the high-alkalinity slag system in the VOD or AOD reduction period, and strictly controls Al and Al in the alloy slag 2 O 3 The content of the hard impurities avoids the influence of the hard impurities on the microfilament product, and the problem of stainless steel microfilament cold-drawing wire breakage caused by cleanliness or impurity control is solved.
Compared with the prior art that the slag containing the alkali metal oxide is directly added into the steel to directly modify or deoxidize the inclusion, the method has the advantages of simple and effective adding method, high operability and high efficiency.
Preferably, the Al and Ti content in the low-Al ferrosilicon is less than 0.8wt%, thereby controlling the Al and Ti content in the alloy slag.
Wherein the basicity symbol of the slag is R, which represents the CaO content and SiO content in the slag 2 Ratio of contents, i.e. CaO/SiO 2 。
In the VOD or AOD reduction period, the alkalinity of the slag is adjusted to be more than 2.2, so that the hard inclusion with high melting point can be promoted to be absorbed and removed by a slag system, the number of the inclusion is reduced, and the T.O content is reduced. When the alkalinity of the filter residue is lower than 2.2, a large amount of high-melting-point hard inclusions are remained in the steel, and the cold drawing effect is influenced.
Preferably, the effect is better when the slag alkalinity in the step (1) is 2.2-2.4.
Wherein the symbol of the alkali metal-containing oxide is M 2 O, wherein M is an alkali metal element and comprises K, na and Li.
In the invention, the slag fluidity is adjusted by adopting the slag containing the alkali metal oxide, so that the metallurgical effect of the slag can be improved, and the content of the alkali metal oxide in the slag can be improved.
Preferably, the synthetic slag comprises, by weight: 32% -36% of SiO 2 ：48％-54％，MgO：10％-20％。
Preferably, the particle size range of the synthetic slag is 3-30mm, and preferably 3-10mm.
In the step (1) and the step (2), the alkali metal oxide-containing slag includes glass and/or alkali metal silicate.
Preferably, the glass comprises, in weight percent, caO:10% -20% of SiO 2 ：65％-80％，M 2 O:10% -20%; wherein M is an alkali metal element, including K, na and Li.
Preferably, the amount of the surfactant is, in weight percent,the alkali metal silicate comprises SiO 2 ：45％-60％，M 2 O:40% -55%; wherein M is an alkali metal element, including K, na and Li.
After VOD reduction period or AOD slag skimming, the alkalinity of the slag is adjusted to 1.6-2.0 to inhibit the Al content in steel and Al in inclusions 2 O 3 And the melting point of the inclusions is reduced. When the alkalinity of the slag is lower than 1.6, the alkalinity of the slag is too low, the T.O content in steel is increased, the number and the size of inclusions are increased, and the wire drawing effect is influenced; when the slag basicity is higher than 2.0, the residual Al content in the steel increases, and hard inclusions with high melting points are easily formed.
Preferably, after the VOD reduction period or the AOD slag skimming, the effect is better when the alkalinity of the slag is adjusted to 1.6-1.8.
After the VOD reduction period or AOD slag skimming, the content of alkali metal oxide in the slag is controlled to be 2-10wt%, and the slag steel reaction can be carried out to form the inclusion containing the alkali metal oxide, so that the melting point of the inclusion is further reduced. When the content of alkali metal oxide in the slag is less than 2wt%, it is insufficient to generate inclusions containing alkali metal oxide; when the content of the alkali metal oxide in the slag is more than 10wt%, the viscosity of the slag is too low, corrosion of the refractory occurs, and large-sized slag inclusion is easily formed in the steel.
After the VOD reduction period or AOD slag skimming, the effect is better when the content of alkali metal oxide in the slag is controlled to be 4-9 wt%.
Other technical parameters (such as smelting temperature, blowing gas type and flow, slag skimming amount, tapping temperature and the like) involved in the AOD or VOD smelting process are carried out according to the prior art, and the invention is not limited in detail herein.
According to the method for controlling the inclusions in the stainless steel microwire, the alkalinity of the slag is adjusted through the synthetic slag and the alkali metal oxide, the denaturation of the inclusions is promoted, the improvement of cleanliness and the plasticization of the inclusions are realized, and the requirements of microwire stainless steel products are met.
In a second aspect, based on the same inventive concept, the invention provides a method for preparing stainless steel microwires, which comprises smelting, continuous casting, rolling and wire drawing, wherein the smelting adopts the method for controlling inclusions in the stainless steel microwires provided by the first aspect of the invention to control the inclusions in the stainless steel microwires.
The smelting process comprises the following steps: the method comprises the steps of molten iron pretreatment, converter, slag skimming station, VOD-LF.
The smelting process comprises the following steps: EAF or BOF + intermediate frequency furnace-AOD-LTS-LF.
Wherein the wire drawing is carried out in a cold drawing mode.
Wherein, according to the actual production condition, the LF procedure in the process flow can be cancelled.
The continuous casting, rolling, wire drawing and other processes related to the preparation method of the stainless steel microfilament can be carried out according to the prior art, and the preparation method is not particularly limited.
In a third aspect, based on the same inventive concept, the invention also provides a stainless steel microwire, which is prepared by the preparation method of the stainless steel microwire.
The inclusions in the stainless steel obtained by the method have the advantages of low melting point and high plasticity, the wire breakage rate of the cold-drawn microfilament is reduced, and the method is high in efficiency, strong in operability and easy to popularize.
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.
Wherein, the steel type smelted in the examples 1 to 4 is 316 stainless steel, the diameter of the microwire is 30 μm, and the plasticization control of the inclusion is realized mainly by regulating and controlling the alkalinity of the slag and the contents of different alkali metal oxides. The comparative example is a conventional 316 stainless steel smelting process.
Example 1
The process flow comprises the following steps: molten iron pretreatment-converter-slagging-off station-80 tVOD-LF-continuous casting-rolling-cold drawing
I VOD reduction period adopts low-aluminum silicon iron (Al content is 0.73%) to reduce, lime is added to adjust slag alkalinity R (CaO/SiO) 2 ) 2.38, an alkali metal oxide-containing slag (conventional) was addedGlass) to adjust the fluidity of the slag, and the amount of the slag is 2.1t.
II LF adding 200kg of synthetic slag with the granularity of 20-30mm and 200kg of slag charge containing alkali metal oxide, adjusting the alkalinity of the slag to 1.73, and adding Na in the slag 2 The O content is 4.2 percent, and the Al content in the steel is 0.0045 percent.
Wherein the synthetic slag comprises the following components: 36% of SiO 2 ：54％，MgO：10％。
Wherein the alkali metal oxide slag comprises the following components: 16% of SiO 2 ：69％，Na 2 O：15％。
Example 2
The process flow comprises the following steps: molten iron pretreatment-converter-slagging-off station-80 tVOD-LF-continuous casting-rolling-cold drawing
I VOD reduction period adopts low-aluminum silicon iron (Al content is 0.52%) to reduce, lime is added to adjust slag alkalinity R (CaO/SiO) 2 ) 2.45, adding slag charge containing alkali metal oxide to adjust the fluidity of the slag, wherein the slag amount is 2.2t.
II LF adding synthetic slag with the granularity of 10-20mm and slag charge containing alkali metal oxide, adjusting the alkalinity of the slag to 1.83, and adding Na in the slag 2 The O content is 6.5 percent, and the Al content in the steel is 0.0032 percent.
Wherein the synthetic slag comprises the following components: 36% of SiO 2 ：54％，MgO：10％。
Wherein the alkali metal oxide slag is SiO 2 ：50％，Na 2 O：50％。
Example 3
The process flow comprises the following steps: molten iron pretreatment-converter-slagging-off station-80 tVOD-LF-continuous casting-rolling-cold drawing
I, adopting low-aluminum silicon iron (Al content is 0.38%) to reduce in VOD reduction period, adding lime to adjust slag alkalinity R (CaO/SiO) 2 ) 2.36, adding slag charge containing alkali metal oxide to adjust the fluidity of the slag, wherein the slag amount is 1.9t.
II LF adding synthetic slag with 5-10mm granularity and slag containing alkali metal oxide, adjusting the alkalinity of the slag to 1.62, and adding Na in the slag 2 The O content is 8.2 percent, and the Al content in the steel is 0.0037 percent.
Wherein the synthetic slag comprises the following components: 36% of SiO 2 ：54％，MgO：10％。
Wherein the alkali metal oxide slag is SiO 2 ：50％，Na 2 O：50％。
Example 4
The process flow comprises the following steps: AOD-LTS-continuous casting-rolling-cold drawing
I, reducing by adopting low-aluminum ferrosilicon (Al content is 0.38%) in the AOD reduction period, and adjusting the alkalinity R (CaO/SiO) of the slag 2 ) 2.21, adding slag containing alkali metal oxide after deslagging to adjust the fluidity of the slag.
The slag amount of the II LTS slag after slag skimming is 1.9t, synthetic slag with the granularity of 3-5mm and slag charge containing alkali metal oxide are added, the alkalinity of the slag is adjusted to 1.65, and Na is contained in the slag 2 4.9 percent of O and 0.0033 percent of Al in the steel.
Wherein the synthetic slag comprises the following components: 32% of SiO 2 ：48％，MgO：20％。
Wherein the alkali metal oxide slag comprises the following components: 16% of SiO 2 ：69％，Na 2 O：15％。
Comparative example 1
The process flow comprises the following steps: molten iron pretreatment-converter-slagging-off station-80 tVOD-LF-continuous casting-rolling-cold drawing
I, adopting low-aluminum silicon iron (Al content is 0.98%) to reduce in VOD reduction period, adding lime to adjust slag alkalinity R (CaO/SiO) 2 ) At 1.93, fluorite was added to adjust the fluidity of the slag, and the amount of slag was 2.1t.
II LF finely adjusts the alkalinity and the fluidity of the slag through fluorite lime, the alkalinity is 2.15, and the Al content in the steel is 0.0049%.
Comparative example 2
The process flow comprises the following steps: AOD-LTS-continuous casting-rolling-cold drawing
In the I AOD reduction period, low-aluminum silicon iron (Al content is 0.6%) is adopted for reduction, and the basicity R (CaO/SiO) of the slag is adjusted 2 ) 2.1, adding fluorite after deslagging to adjust the fluidity of the slag.
And II, after slagging off, the slag amount of the LTS is 1.9t, quartz sand is added for slag adjustment, the alkalinity of the slag is adjusted to 1.42, and the Al content in the steel is 0.0042%.
Effect test and result analysis:
1. T.O content and S content of casting blanks of examples 1 to 4 and comparative examples were analyzed by an oxygen-nitrogen analyzer. As can be seen from the results shown in table 1, the t.o content and the S content of examples 1 to 4 were significantly reduced as compared to those of the comparative example.
2. The alkali metal oxide content in the casting inclusions was counted by SEM and EDS analysis, and the average value was calculated, and the results are shown in table 1. It can be seen from this that the content of alkali metal oxide in the ingot inclusions of examples 1 to 4 was much larger than that of the ingot inclusions of comparative example.
3. The weight of the product without occurrence of cold-drawn broken filaments (i.e., cold-drawn weight) was counted and recorded in table 1. It is evident that the cold drawn weights of examples 1-4 are significantly improved compared to those of the comparative example.
TABLE 1 summary of test results for examples 1-4 and comparative example 1
4. The casting blank inclusions in example 3 were analyzed for morphology and distribution by scanning electron microscopy. Wherein, figure 1 is the appearance and distribution of inclusions of a wire rod with the diameter of 10mm along the section along the rolling direction, and figure 2 is the appearance and distribution of inclusions of the section along the cold drawing direction in steel when the steel is cold drawn to 1 mm.
Through the technology of the invention, after the low melting point plastification of the inclusion is controlled, the inclusion is elongated and thinned along with a steel matrix in the process of rolling a 10mm wire rod, and the point-shaped inclusion with the size less than 5 mu m is formed after cold drawing, so that the harmless treatment of the inclusion is realized.
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 (9)
1. A method for controlling stainless steel microfilament inclusions is characterized by comprising the following steps:
(1) Adopting low-aluminum ferrosilicon to reduce in a VOD or AOD reduction period, adjusting the alkalinity of the slag to be more than or equal to 2.2, and adding slag containing alkali metal oxide to adjust the fluidity of the slag;
(2) After VOD reduction period or AOD slag skimming, adding synthetic slag and slag charge containing alkali metal oxide, adjusting the alkalinity of the slag to 1.6-2.0, and making the alkali metal oxide content in the slag 2-10wt% and the Al content in the steel less than 0.005wt%;
wherein the synthetic slag comprises the following components in percentage by weight: 32% -36% of SiO 2 ：48％-54％，MgO：10％-20％。
2. The method for controlling stainless steel microwire inclusions according to claim 1, characterized in that the grain size of said synthetic slag is 3-30mm.
3. The method of claim 1, wherein the alkali oxide-containing slag comprises glass and/or alkali silicate.
4. The method for controlling inclusions in stainless steel microwire according to claim 1, wherein the low-Al ferrosilicon contains Al and Ti in an amount of < 0.8 wt.%.
5. The method of controlling stainless steel microwire inclusions of claim 3, wherein said glass comprises, in weight percent, caO:10% -20% of SiO 2 ：65％-80％，M 2 O:10% -20%; wherein M is an alkali metal element, including K, na and Li.
6. The method of claim 3, wherein the alkali metal silicate comprises SiO in weight percent 2 ：45％-60％，M 2 O:40% -55%; wherein M is an alkali metal element including K,Na、Li。
7. A preparation method of stainless steel microfilaments, comprising smelting, continuous casting, rolling and wire drawing, and is characterized in that the stainless steel microfilaments are controlled by the method for controlling the inclusions in the stainless steel microfilaments according to any one of claims 1 to 6.
8. The method for preparing the stainless steel microfilament according to claim 7, characterized in that the smelting process comprises the following steps: molten iron pretreatment, converter, slagging station, VOD-LF, or, EAF or BOF + intermediate frequency furnace, AOD-LTS-LF.
9. A stainless steel microwire, characterized by being produced by the method of producing a stainless steel microwire according to any of claims 7 to 8.
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| CN202210042472.8A CN114369700B (en) | 2022-01-14 | 2022-01-14 | Method for controlling inclusions in stainless steel microfilament, stainless steel microfilament and preparation method thereof |
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| CN202210042472.8A CN114369700B (en) | 2022-01-14 | 2022-01-14 | Method for controlling inclusions in stainless steel microfilament, stainless steel microfilament and preparation method thereof |
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| CN114369700B true CN114369700B (en) | 2023-02-24 |
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| JP2008240126A (en) * | 2007-03-28 | 2008-10-09 | Jfe Steel Kk | Method for refining molten stainless steel |
| CN101954464A (en) * | 2010-10-19 | 2011-01-26 | 武汉钢铁(集团)公司 | Low-oxidizability continuous casting covering slag |
| CN105567907A (en) * | 2016-01-06 | 2016-05-11 | 山西太钢不锈钢股份有限公司 | Method for controlling plastic inclusions of austenitic stainless steel |
| JP2016074946A (en) * | 2014-10-06 | 2016-05-12 | 山陽特殊製鋼株式会社 | Austenitic stainless steel excellent in wire drawing |
| CN105624580A (en) * | 2016-03-07 | 2016-06-01 | 江苏科技大学 | Duplex stainless steel wire and preparation method thereof |
| CN110760755A (en) * | 2019-11-12 | 2020-02-07 | 江阴康瑞成型技术科技有限公司 | Process for manufacturing corrosion-resistant low-cost refined environment-friendly stainless steel wire |
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| CN110055375A (en) * | 2019-04-23 | 2019-07-26 | 南京钢铁股份有限公司 | A kind of Ultra-low carbon ultralow-sulfur steel smelting process |
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| JP2008240126A (en) * | 2007-03-28 | 2008-10-09 | Jfe Steel Kk | Method for refining molten stainless steel |
| CN101954464A (en) * | 2010-10-19 | 2011-01-26 | 武汉钢铁(集团)公司 | Low-oxidizability continuous casting covering slag |
| JP2016074946A (en) * | 2014-10-06 | 2016-05-12 | 山陽特殊製鋼株式会社 | Austenitic stainless steel excellent in wire drawing |
| CN105567907A (en) * | 2016-01-06 | 2016-05-11 | 山西太钢不锈钢股份有限公司 | Method for controlling plastic inclusions of austenitic stainless steel |
| CN105624580A (en) * | 2016-03-07 | 2016-06-01 | 江苏科技大学 | Duplex stainless steel wire and preparation method thereof |
| CN110760755A (en) * | 2019-11-12 | 2020-02-07 | 江阴康瑞成型技术科技有限公司 | Process for manufacturing corrosion-resistant low-cost refined environment-friendly stainless steel wire |
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