CN114774763B - Corrosion-resistant steel containing high rare earth lanthanum content and refining control method thereof - Google Patents

Corrosion-resistant steel containing high rare earth lanthanum content and refining control method thereof Download PDF

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CN114774763B
CN114774763B CN202210243137.4A CN202210243137A CN114774763B CN 114774763 B CN114774763 B CN 114774763B CN 202210243137 A CN202210243137 A CN 202210243137A CN 114774763 B CN114774763 B CN 114774763B
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CN114774763A (en
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赵博
吴伟
林路
崔怀周
姚同路
曾加庆
梁强
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Inner Mongolia Bao Gang United Steel Co ltd
Central Iron and Steel Research Institute
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • 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
    • C21C7/10—Handling in a vacuum
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention discloses corrosion-resistant steel with high rare earth lanthanum content and a refining control method thereof, belongs to the technical field of production of rare earth corrosion-resistant steel by a converter and an electric furnace, and solves the problems that the yield of rare earth lanthanum element is low and lanthanum oxide and lanthanum oxysulfide are easy to generate in the existing corrosion-resistant steel production. The corrosion-resistant steel containing high rare earth lanthanum comprises the following chemical components in percentage by weight: less than or equal to 0.12 percent of C, less than or equal to 0.75 percent of Si, less than or equal to 1.5 percent of Mn, and less than or equal to Ni:0.12 to 0.65 percent of Cr:0.30 to 1.25 percent of Cu:0.20 to 0.55 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.008 percent, la:0.01 to 0.2 percent, and the balance of Fe and unavoidable impurities; the rare earth lanthanum compound exists mainly in the form of lanthanum sulfide in steel. The service life of the steel is prolonged by more than 50% compared with that of common carbon steel in the atmospheric corrosion environment, so that the yield of rare earth lanthanum is increased by more than 35%, and the yield is increased by 15% compared with that of the conventional rare earth, thereby reducing the production cost by 25 yuan per ton of steel.

Description

Corrosion-resistant steel containing high rare earth lanthanum content and refining control method thereof
Technical Field
The invention belongs to the technical field of production of rare earth corrosion-resistant steel by a converter and an electric furnace, and particularly relates to corrosion-resistant steel with high rare earth lanthanum content and a refining control method thereof.
Background
The steel material is a commonly used metal material at present, and can be corroded after long-time exposure in the atmosphere, so that the performance of the steel material is reduced and the material is scrapped. At the beginning of the 20 th century, researches of students find that the effect of resisting corrosion of steel can be achieved by adding a proper amount of P, cu, cr, ni and other alloy elements, and the steel is the corrosion-resistant steel commonly used at present. Corrosion resistant steel has found wide application in the manufacture of containers and railway vehicles.
Researches in recent years show that the rare earth element lanthanum can obviously improve the corrosion resistance of steel, the novel rare earth corrosion resistant steel containing lanthanum is added on the basis of the components of the traditional corrosion resistant steel, the atmospheric corrosion resistance is improved by 30-50% under the atmospheric environment, and the service life of the rare earth corrosion resistant steel can be prolonged to more than 70 years. The rare earth element lanthanum is used as a byproduct of the rare earth ore extraction process, the cost is lower than that of Cu, cr, ni and other alloy elements, the cost of corrosion-resistant steel formed by alloying lanthanum is only increased by 30-50 yuan per ton of steel, and the cost performance is higher than that of the common copper-phosphorus-chromium-nickel corrosion-resistant steel. Laboratory research results show that in order to improve the atmospheric corrosion resistance effect of the corrosion-resistant steel, the rare earth corrosion-resistant steel contains solid solution rare earth and rare earth sulfide as much as possible, and the production of rare earth oxide and rare earth oxysulfide is avoided.
The lanthanum element obviously improves the corrosion resistance of the steel based on the large alloying amount (0.01-0.2%), but the lanthanum element has strong reducibility, so that the lanthanum element has low yield in steel and is easy to generate oxides and oxysulfide. In the existing production, how to ensure the high solid solution quantity of rare earth and lanthanum sulfide content in the corrosion-resistant steel, avoiding generating lanthanum oxide and lanthanum oxysulfide, and being very difficult for refining the corrosion-resistant steel with high lanthanum content.
Disclosure of Invention
In view of the above analysis, the invention aims to provide a corrosion-resistant steel with high rare earth lanthanum content and a refining control method thereof, aiming at the defects in the prior art, so as to solve the problems that the yield of rare earth lanthanum element is low (10-30%) and lanthanum oxide and lanthanum oxysulfide are easy to generate in the existing corrosion-resistant steel production, and the lanthanum element in the rare earth corrosion-resistant steel mainly exists in the form of lanthanum sulfide.
The aim of the invention is mainly realized by the following technical scheme:
on one hand, the invention provides corrosion-resistant steel with high rare earth lanthanum content, which comprises the following chemical components in percentage by weight: less than or equal to 0.12 percent of C, less than or equal to 0.75 percent of Si, less than or equal to 1.5 percent of Mn, and less than or equal to Ni:0.12 to 0.65 percent of Cr:0.30 to 1.25 percent of Cu:0.20 to 0.55 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.008 percent, la:0.01 to 0.2 percent, and the balance of Fe and unavoidable impurities; the rare earth lanthanum compound exists mainly in the form of lanthanum sulfide in steel.
Further, the corrosion resistant steel containing high rare earth lanthanum content is steel for a container and a railway vehicle.
In addition, the invention also provides a refining control method of the corrosion-resistant steel with high rare earth lanthanum content, which comprises the following steps:
step 1, after tapping of a converter or an electric furnace, white slag operation is performed in LF furnace refining, slag thickness is controlled to be 130-160 mm, white slag duration is more than 20min, molten steel [ S ] content is controlled to be in a range of 0.006-0.008%, [ Als ] content is controlled to be in a range of 0.04-0.15%, argon is blown softly before tapping, and [ O ] <2.0ppm in molten steel is controlled before tapping;
and 2, after refining and discharging in an LF furnace, carrying out vacuum circulation degassing in an RH furnace, controlling the [ Als ] content within a range of 0.04-0.15%, adding rare earth lanthanum alloy 2-5 min before vacuum breaking, controlling the [ O ] content in molten steel to be less than 2.0ppm after vacuum breaking, then feeding a calcium wire and soft argon blowing, and controlling the [ Ca ] content in the molten steel to be within a range of 0.002-0.010% after feeding the calcium wire.
Further, in the step 1, the white slag comprises the following components in percentage by mass: caO:50 to 65 percent of SiO 2 ：5～7％，Al 2 O 3 ：25～30％，La 2 O 3 : 0-10%, mgO: 5-8%, feO+MnO less than 0.5%, and alkalinity CaO/SiO 2 8 to 10.
In step 2, the vacuum degree of the RH furnace is within 200Pa, and the vacuum circulation degassing maintaining time is more than 15min.
Further, in the step 1, the soft argon blowing time is 5 to 8 minutes, and the soft argon blowing amount is 0.005 to 0.01Nm 3 /(t.min); in the step 2, the soft argon blowing time is 8-10 min, and the soft argon blowing amount is 0.005-0.008 Nm 3 /(t·min)。
Further, when the La content of the corrosion resistant steel containing high rare earth lanthanum content is 0.01-0.05%, the Als in the molten steel is controlled to be in the range of 0.04-0.06%;
when the La content of the corrosion resistant steel containing high rare earth lanthanum content is (0.05-0.1%), controlling the [ Als ] in the molten steel to be in the range of 0.06-0.09%;
when La content of the corrosion resistant steel containing high rare earth lanthanum content is 0.1-0.2%, controlling [ Als ] in molten steel to be 0.09-0.15%.
Further, in the step 1, the white slag comprises the following components in percentage by mass: caO:50 to 65 percent of SiO 2 ：5～7％，Al 2 O 3 ：25～30％，La 2 O 3 : 0-10%, mgO: 5-8%, feO+MnO less than 0.5%, and alkalinity CaO/SiO 2 8 to 10;
when the La content of the corrosion resistant steel containing high rare earth lanthanum content is 0.01-0.05%, controlling the Als in the molten steel to be in the range of 0.04-0.06%;
when the La content of the corrosion resistant steel containing high rare earth lanthanum content is (0.05-0.1%), controlling the [ Als ] in the molten steel to be in the range of 0.06-0.09%;
when the La content of the corrosion resistant steel containing high rare earth lanthanum content is 0.1-0.2%, controlling the Als in the molten steel to be in the range of 0.09-0.15%;
la content of corrosion resistant steel containing high rare earth lanthanum content is [ 0.01-0.05%]When the white slag contains La 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]More than or equal to 0.04 percent; when the white slag contains La 2 O 3 When the content is 0-5%, controlling molten steel [ Als ]]＝0.05～0.06％；
When La content of corrosion resistant steel containing high rare earth lanthanum content is (0.05-0.1%), la is contained in white slag 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]More than or equal to 0.06 percent; when the white slag contains La 2 O 3 When the content is 0-5%, controlling molten steel [ Als ]]＝0.07～0.09％；
La content of corrosion resistant steel containing high rare earth lanthanum content is [ 0.1-0.2%]When the white slag contains La 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]=0.09 to 0.10%; when the white slag contains La 2 O 3 When the content is 1-5%, controlling molten steel [ Als ]]=0.10 to 0.12%; when La in white slag 2 O 3 Is 0 to 1%]When the molten steel [ Als ] is controlled]＝0.11～0.15％。
Further, la content of the corrosion resistant steel containing high rare earth lanthanum content is [ 0.01-0.05%]When in steel [ Als ]]、[O]、[La]Content and in white slag (La) 2 O 3 ) The following relationship exists between the content: [ Als ]]＝9.77×10-8/[O] 3/2 +(0.13～0.15)[La]-(0.0062～0.0064)(La 2 O 3 ) 1/2 In steel [ Ca ]]、[Als]、[La]The content has the following relation: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 ；
When La content of corrosion resistant steel containing high rare earth lanthanum content is (0.05-0.1%), [ Als ] in steel]、[O]、[La]Content and in white slag (La) 2 O 3 ) The following relationship exists between the content: [ Als ]]＝9.77×10-8/[O] 3/2 +(0.32～0.34)[La]-(0.0124～0.0128)(La 2 O 3 ) 1/2 In steel [ Ca ]]、[Als]、[La]The content has the following relation: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 ；
La content of corrosion resistant steel containing high rare earth lanthanum content is [ 0.1-0.2%]When in steel [ Als ]]、[O]、[La]Content and in white slag (La) 2 O 3 ) The following relationship exists between the content: [ Als ]]＝9.77×10-8/[O] 3/2 +(0.47～0.49)[La]-(0.0156～0.0160)(La 2 O 3 ) 1/2 In steel [ Ca ]]、[Als]、[La]The content has the following relation: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 。
Further, la is used as the inclusion of lanthanum in the corrosion resistant steel 2 S 3 Mainly, the content is more than 70%.
Compared with the prior art, the invention has the following beneficial effects:
1. the rare earth La content in the steel is controlled to be 0.01-0.2%, and the service life of the steel is prolonged by more than 50% compared with that of common carbon steel in an atmospheric corrosion environment.
2. The refining control method can improve the yield of rare earth lanthanum, so that the yield is more than 35%, and is improved by 15% compared with the existing rare earth yield, and the production cost is reduced by 25 yuan per ton of steel.
3. The refining control method of the invention ensures that the rare earth lanthanum compound exists mainly in the form of sulfide in the steel, thereby effectively improving the corrosion resistance of the steel.
Drawings
FIG. 1 is a plot of the dominant region of La300ppm, al=600 ppm rare earth lanthanum inclusions in steel;
fig. 2 is a graph of a dominant zone of La800ppm, al=900 ppm rare earth lanthanum inclusion in steel;
FIG. 3 is a plot of the dominant region of La1500ppm, al=1500 ppm rare earth lanthanum inclusions in steel;
Detailed Description
The following describes a corrosion-resistant steel having a high rare earth lanthanum content and a refining control method thereof in further detail with reference to specific examples, which are for illustrative purposes only, and the present invention is not limited to these examples. The content of the components in the invention is mass percent.
The invention provides a corrosion-resistant steel with high rare earth lanthanum content, which is prepared from a converter (electric furnace), an LF furnace, an RH furnace and continuous casting, wherein the corrosion-resistant steel is a container or railway vehicle steel containing copper, phosphorus, chromium and nickel elements, and the rare earth La content is 0.01-0.2%.
Specifically, the corrosion resistant steel comprises the following components in percentage by weight: less than or equal to 0.12 percent of C, less than or equal to 0.75 percent of Si, less than or equal to 1.5 percent of Mn, and less than or equal to Ni:0.12 to 0.65 percent of Cr:0.30 to 1.25 percent of Cu:0.20 to 0.55 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.008 percent, la:0.01 to 0.2 percent, and the balance of Fe and unavoidable impurities; the rare earth lanthanum compound exists mainly in the form of lanthanum sulfide in steel.
The solid solution state rare earth and rare earth sulfide can be changed into free state metal particles under the acidic condition, so that the generation of hydroxyl alpha iron can be promoted, and the purpose of inhibiting corrosion can be achieved.
Aiming at the corrosion-resistant steel with high rare earth lanthanum content, the invention provides a refining control method, which comprises the following steps:
step S1: after tapping of a converter (an electric furnace), the molten steel is operated to an LF furnace, and white slag operation is adjusted in the refining process of the LF furnace, and La can be additionally added into the white slag 2 O 3 ，La 2 O 3 The addition amount of the catalyst is the mass percent of the total slag amount0 to 10 percent (such as 0 to 1 percent), 1 to 5 percent, 0 to 5 percent and 5 to 10 percent of the weight percentage)]). The duration time of refining white slag in an LF furnace is more than 20min, and molten steel [ S ] is controlled]The content is within the range of 0.006-0.008 percent, [ Als ]]The content is in the range of 0.04-0.15%. Determination of molten steel dissolved oxygen content [ O ] before outbound]<2.0ppm. Controlling the slag thickness to be 130-160 mm, and soft argon blowing time to be 5-8 min and soft argon blowing air quantity to be 0.005-0.01 Nm 3 /(t·min)。
In the molten steel tapped from the converter (electric furnace), S <0.01%, P <0.015%, als: 0.04-0.15%, and the temperature is more than 1500 ℃.
Specifically, the white slag comprises the following components in percentage by mass: 50 to 65 percent of SiO 2 ：5～7％，Al 2 O 3 ：25～30％，La 2 O 3 : 0-10%, mgO: 5-8%, feO+MnO less than 0.5%, and alkalinity CaO/SiO 2 8 to 10, [ S ] in molten steel]The content is controlled in the required range by the reaction balance of the white slag and molten steel, in addition, in order to inhibit the oxidation of rare earth lanthanum, the oxygen content in the molten steel is controlled by adding an aluminum block or an aluminum feeding wire, and meanwhile, la can be additionally added into the white slag 2 O 3 Lanthanum oxidation is controlled by the reaction balance of white slag and molten steel.
In addition, because of the limitation of metallurgical physicochemical reaction dynamics conditions, the technological limit of controlling the [ O ] content in the steel smelting is 1ppm, so that the dissolved oxygen content of molten steel is controlled to be in the range of 1.0 ppm-2.0 ppm, and the [ O ] content is indirectly controlled to be in the specified range by controlling the [ Als ] content in the steel in the refining process. The control of the [ S ] content is performed simultaneously with the control of the [ O ], because if the [ S ] content is controlled according to the normal steel grade, most of the generated inclusions are oxides, free rare earth ions cannot be formed, and the sulfur content is controlled so as to form sulfides, thereby having the effect of inhibiting corrosion. The white slag belongs to reducing slag, has the function of adsorbing oxygen elements of a molten steel contact layer, and simultaneously can fix S elements of the molten steel contact layer, so that the elements transfer mass to the surface layer through the formed concentration difference.
In order to smoothly carry out the refining process operation, the clearance height of the ladle after tapping of the converter (electric furnace) is controlled to be more than 160mm in consideration of the thickness requirement of a refining slag layer. Before the refining of the LF furnace is finished, argon is blown in soft, the purity of the argon is above 99.99%, the principle of soft argon blowing is that the slag surface is not cracked, and the soft blowing mainly promotes the floating of inclusions and achieves the aim of uniform components.
In addition, for the stability of the process and the cooperation with the RH refining process, the temperature of the LF outlet molten steel is controlled to be 1590-1600 ℃.
Step S2: the LF furnace is refined and discharged and then is operated to an RH furnace, vacuum circulation degassing is carried out in the RH furnace, and [ Als ] is controlled during vacuum degassing]Adding rare earth alloy 2-5 min before breaking vacuum, measuring molten steel dissolved oxygen content O after breaking vacuum and before feeding calcium wire]<2.0ppm, measurement of [ Ca ] in molten steel after calcium line feeding]The content is in the range of 0.002-0.010%. The soft argon blowing time is 8-10 min, and the soft argon blowing amount is 0.005-0.008 Nm 3 /(t·min)。
It is to be noted that, in the RH furnace, the [ Als ] content is controlled within the range of 0.04-0.15%, a reducing environment is created, at this time, the oxygen content in the molten steel is also low, then rare earth lanthanum alloy is added, and the oxidation of lanthanum is avoided to the maximum extent. The calcium line is used for denaturing alumina inclusion, the calcium aluminum compound has different combinations, and the calcium content is controlled to generate low-melting point compound. The soft argon blowing is used for promoting the floating of the inclusions and removing the gas. In addition, after vacuum breaking, soft argon blowing and calcium feeding are simultaneously carried out, the purity of the argon is over 99.99 percent, and the principle of soft argon blowing is that the slag surface is not cracked.
Specifically, the vacuum degree of the RH furnace is within 200Pa, the holding time is more than 15min, and the lower the vacuum degree is, the better the gas removal effect is. Rare earth lanthanum alloy is added from an RH vacuum chamber, the rare earth lanthanum alloy is rare earth iron alloy, wherein the lanthanum content is 30%, the iron content is 70%, the rare earth content of the rare earth iron alloy is mainly limited by the processes of preservation, transportation and the like, and the rare earth alloy is not easy to transport and is easy to oxidize and ignite due to excessive rare earth content.
According to the invention, through multiple tests, the yield of the rare earth lanthanum is about 40% under the process system of the invention, so that the feeding amount is designed according to the yield of 40% in actual production. If the La content in the steel is designed to be 0.1%, the La content is added according to the content of 0.25%, and then when the iron alloy with the La content of 30% is added, the adding amount of the rare earth iron alloy is 0.833% of the final product content.
For the stability of the process and the cooperation with the next process, continuous casting, the temperature of the RH outlet molten steel is 1560-1570 ℃.
Specifically, according to the different designed rare earth La contents in molten steel, more accurate technological parameter settings are provided:
c1: when the rare earth La content in the finished steel is designed to be 0.01-0.05%, in the step S1, the Als in the molten steel is controlled to be 0.04-0.06% in the refining process of the LF furnace.
Specifically, when the white slag contains La 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]More than or equal to 0.04 percent; when the white slag contains La 2 O 3 When the content is 0-5%, controlling molten steel [ Als ]]＝0.05～0.06％。
Further, in steel [ Als ]]、[O]、[La]Content and slag (La) 2 O 3 ) The following relationship exists between the content:
[Als]＝9.77×10 -8 /[O] 3/2 +(0.13～0.15)[La]-(0.0062～0.0064)(La 2 O 3 ) 1/2 i.e. in steel [ La]The designed content of (2) is 0.01-0.05%]In molten steel [ O ]]<2.0ppm、[S]：0.006～0.008％、[Als]:0.04 to 0.06 percent, and the slag (La) 2 O 3 ) The addition amount of (A) is in the range of 0 to 10%, and [ Als ] can be determined according to the above formula]And in slag (La) 2 O 3 ) And (5) fine tuning is performed.
In step S2, in the refining in the RH furnace, ca in the molten steel after the calcium wire is fed]、[Als]、[La]The content has the following relation: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 I.e. in steel [ La]The designed content of (2) is 0.01-0.05%]Control of [ Als ] in molten steel]Within the range of 0.04 to 0.06%, the above formula can be applied according to [ Als ]]Specific content of [ Ca ] in steel]And (5) fine tuning is performed.
FIG. 1 is a graph showing the dominant region of La300ppm, al=600 ppm rare earth lanthanum inclusion in steel, and it can be seen that [ O]The content is 1.0ppm to 2.0ppm, [ S ]]The content is in the range of 0.006 to 0.008 percent, la 2 S 3 Compared with other lanthanum oxide and oxygenLanthanum sulfide has a production advantage.
C2: when the rare earth La content in the finished steel is designed to be (0.05-0.1%), in step S1, [ Als ] in the molten steel is controlled to be in the range of 0.06-0.09% in the refining process of the LF furnace.
Specifically, when the white slag contains La 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]More than or equal to 0.06 percent; when the white slag contains La 2 O 3 When the content is 0-5%, controlling molten steel [ Als ]]＝0.07～0.09％。
Further, in steel [ Als ]]、[O]、[La]Content and slag (La) 2 O 3 ) The following relationship exists between the content:
[Als]＝9.77×10 -8 /[O] 3/2 +(0.32～0.34)[La]-(0.0124～0.0128)(La 2 O 3 ) 1/2 i.e. in steel [ La]When the designed content of (0.05-0.1%), O in the molten steel]<2.0ppm、[S]：0.006～0.008％、[Als]:0.06 to 0.09 percent, and the slag (La) 2 O 3 ) The addition amount of (A) is in the range of 0 to 10%, and [ Als ] can be determined according to the above formula]And in slag (La) 2 O 3 ) And (5) fine tuning is performed.
In step S2, in the refining in the RH furnace, ca in the molten steel after the calcium wire is fed]、[Als]、[La]The content has the following relation: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 I.e. in steel [ La]When the designed content of (0.05-0.1%), the [ Als ] is controlled in the molten steel]Within the range of 0.06 to 0.09%, the above formula can be applied according to [ Als ]]Specific content of [ Ca ] in steel]And (5) fine tuning is performed.
FIG. 2 is a graph showing the dominant region of La800ppm, al=900 ppm rare earth lanthanum inclusion in steel, and it can be seen that [ O ]]The content is 1.0ppm to 2.0ppm, [ S ]]The content is in the range of 0.006 to 0.008 percent, la 2 S 3 Has the production advantage compared with other lanthanum oxide and lanthanum oxysulfide.
And C3: when the rare earth La content in the finished steel is designed to be 0.1-0.2%, in the step S1, the Als in the molten steel is controlled to be in the range of 0.09-0.15% in the refining process of the LF furnace.
Specifically, when the white slag contains La 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]＝0.09 to 0.10 percent; when the white slag contains La 2 O 3 When the content is 1-5%, controlling molten steel [ Als ]]=0.10 to 0.12%; when La in white slag 2 O 3 Is 0 to 1%]When the molten steel [ Als ] is controlled]＝0.11～0.15％。
Further, in steel [ Als ]]、[O]、[La]Content and slag (La) 2 O 3 ) The following relationship exists between the content:
[Als]＝9.77×10 -8 /[O] 3/2 +(0.47～0.49)[La]-(0.0156～0.0160)(La 2 O 3 ) 1/2 i.e. in steel [ La]The designed content of (2) is 0.1-0.2%]In molten steel [ O ]]<2.0ppm、[S]：0.006～0.008％、[Als]:0.09 to 0.15 percent, and the slag (La) 2 O 3 ) The addition amount of (A) is in the range of 0 to 10%, and [ Als ] can be determined according to the above formula]And in slag (La) 2 O 3 ) And (5) fine tuning is performed.
In step S2, in the refining in the RH furnace, ca in the molten steel after the calcium wire is fed]、[Als]、[La]The content has the following relation: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 I.e. in steel [ La]The designed content of (2) is 0.1-0.2%]Control of [ Als ] in molten steel]Within the range of 0.09 to 0.15%, the above formula can be applied according to [ Als ]]Specific content of [ Ca ] in steel]And (5) fine tuning is performed.
FIG. 3 is a graph showing the dominant region of La1500ppm, al=1500 ppm rare earth lanthanum inclusion in steel, and it can be seen that [ O]The content is 1.0ppm to 2.0ppm, [ S ]]The content is in the range of 0.006 to 0.008 percent, la 2 S 3 Has the production advantage compared with other lanthanum oxide and lanthanum oxysulfide.
By the embodiment, the yield of rare earth lanthanum in the steel is more than 35 percent, and the inclusions mainly comprise La 2 S 3 Mainly, the service life of the steel is prolonged by more than 50% compared with that of common carbon steel in the atmospheric corrosion environment.
Comparative example
The corrosion resistant steel with the rare earth La content of 0.03 percent is designed and produced, and the refining control steps are as follows:
s1: LF refining in-situ temperature 1562 ℃, deoxidizing and desulfurizing white slag, and controlling molten steel [ S ]]The content is at<0.0020％，[Als]The content is in the range of 0.03 to 0.04%Dissolved oxygen content of molten steel [ O ]]<5ppm, adjusting the temperature, keeping the white slag for 22min, and measuring the dissolved oxygen content [ O ] of the molten steel before the molten steel comes out]=3.50 ppm. The white slag comprises the following components: 55.45, siO 2 ：11.57％，Al 2 O 3 :27.64%, mgO:7.06%, TFeO:0.348%, mnO:0.22% of alkalinity CaO/SiO 2 4.8 and a slag thickness of 116mm. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm 3 /(t.min). The chemical composition for RH refining is shown in Table 1, and the LF off-site temperature is 1594 ℃.
S2: and (3) after the LF furnace is refined and discharged, the LF furnace is operated to an RH furnace, the RH refining in-place temperature is 1585 ℃, vacuum circulation degassing is carried out in the RH furnace, the vacuum degree is 160Pa, and the holding time is 18min. Control of [ Als ] during vacuum degassing]The content is 0.035%, 0.4% lanthanum-iron alloy (lanthanum-iron alloy La content is 30%) is added 3min before vacuum breaking, after vacuum breaking, the dissolved oxygen content O of molten steel is measured before feeding calcium wire]3.35ppm, and control [ Ca ] in molten steel after feeding calcium wire]The content is in the range of 0.0002 to 0.0010%, and 0.00035% after measurement. The soft argon blowing time is 10min, and the soft argon blowing amount is 0.007Nm 3 /(t.min). RH off-site temperature 1562 ℃.
TABLE 1 chemical composition (wt%) of RH refining in comparative example of the present invention
Test number C Si Mn P S Als Ca Cr Ni Cu
0 0.05 0.060 1.29 0.011 0.003 0.035 0.00035 0.73 0.30 0.35
The detection shows that the content of rare earth lanthanum in the finished product is 312ppm, and the rare earth lanthanum yield is 26%. The inclusions are CaS, la 2 O 3 、La 2 S 3 And La (La) 2 O 2 S, in La 2 O 3 Mainly, it accounts for over 80%.
The chemical components of the obtained corrosion-resistant steel with high rare earth lanthanum content are shown in the following table 2 in percentage by weight:
TABLE 2 chemical composition (wt%) of the comparative example rare earth steel product of the present invention
Test number C Si Mn P S Als Ca Cr Ni Cu La
0 0.05 0.060 1.29 0.011 0.003 0.035 0.00035 0.73 0.30 0.35 0.0312
Example 1
The corrosion resistant steel with the rare earth La content of 0.03 percent is designed and produced, and the refining control steps are as follows:
s1: LF refining in-situ temperature is 1565 ℃, la is not added into top slag in the LF refining process 2 O 3 Deoxidizing and desulfurizing white slag, and controlling molten steel S]The content is within the range of 0.006-0.008 percent, [ Als ]]The content is in the range of 0.04-0.06%]<2.0ppm, adjusting the temperature, keeping the white slag for 22min, and measuring the dissolved oxygen content [ O ] of the molten steel before the molten steel comes out]=1.52 ppm. The white slag comprises the following components: 54%, siO 2 ：5.4％，Al 2 O 3 ：30％，La 2 O 3 :0%, mgO:8%, feO+MnO:0.5%, basicity CaO/SiO 2 10 and 139mm thick. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm 3 /(t.min). The chemical composition for RH refining is shown in Table 3, and the LF off-site temperature is 1592 ℃.
Wherein the [ Als ] content range is calculated and precisely controlled according to the following formula, and the [ Als ] range is: 0.0560-0.0566%.
[Als]＝9.77×10 -8 /[O] 3/2 +(0.13～0.15)[La]-(0.0062～0.0064)(La 2 O 3 ) 1/2 。
S2: and (3) after the LF furnace is refined and discharged, the LF furnace is operated to an RH furnace, the RH refining in-place temperature is 1582 ℃, vacuum circulation degassing is carried out in the RH furnace, the vacuum degree is 160Pa, and the holding time is 18min. Control of [ Als ] during vacuum degassing]The content is 0.0563%, 0.25% lanthanum-iron alloy (lanthanum-iron alloy La content 30%) is added 3min before vacuum breaking, and the dissolved oxygen content [ O ] of molten steel is measured after vacuum breaking and before feeding calcium wire]1.35ppm, and control [ Ca ] in molten steel after feeding calcium wire]The content is in the range of 0.002-0.010%. The soft argon blowing time is 10min, and the soft argon blowing amount is 0.007Nm 3 /(t.min). RH off-site temperature 1565 ℃.
Wherein the [ Ca ] content range is calculated and precisely controlled according to the following formula: 0.0020 to 0.0048% and 0.0035% after measurement.
[Ca]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 。
TABLE 3 chemical composition (wt%) of RH refining in example 1 of the present invention
Figure BDA0003543548320000121
The detection shows that the content of rare earth lanthanum in the finished product is 291ppm, and the rare earth lanthanum yield is 38.8%. The inclusions are CaS, la 2 S 3 And La (La) 2 O 2 S, in La 2 S 3 Mainly, the content is more than 70%.
The chemical components of the obtained corrosion-resistant steel with high rare earth lanthanum content are shown in the following table 4 in percentage by weight:
TABLE 4 chemical composition (wt%) of the rare earth steel finished product of example 1 of the present invention
Test number C Si Mn P S Als Ca Cr Ni Cu La
1 0.12 0.74 1.5 0.011 0.0071 0.0563 0.0035 1.23 0.64 0.55 0.0291
Example 2
The corrosion resistant steel with the rare earth La content of 0.08 percent is designed and produced, and the refining control steps are as follows:
s1: LF refining in-situ temperature 1563 ℃, and La is added into top slag in LF refining process 2 O 3 To make La in slag 2 O 3 The content is 5 percent, the white slag is deoxidized and desulfurized, and the molten steel [ S ] is controlled]The content is within the range of 0.006-0.008 percent, [ Als ]]The content is in the range of 0.06-0.09%]<2.0ppm, adjusting the temperature, keeping the white slag for 25min, and measuring the dissolved oxygen content [ O ] of the molten steel before the molten steel comes out]=1.31 ppm. The white slag comprises the following components: 56, siO 2 ：7％，Al 2 O 3 ：25％，La 2 O 3 :5%, mgO:5%, feO+MnO:0.3%, basicity CaO/SiO 2 8, and the slag thickness was 132mm. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm 3 /(t.min). The chemical composition for RH refining is shown in Table 5, and the LF off-site temperature is 1592 ℃.
Wherein the [ Als ] content range is calculated and precisely controlled according to the following formula, and the [ Als ] range is: 0.0765-0.0785%.
[Als]＝9.77×10 -8 /[O] 3/2 +(0.32～0.34)[La]-(0.0124～0.0128)(La 2 O 3 ) 1/2 。
S2: and (3) after the LF furnace is refined and discharged, the LF furnace is operated to an RH furnace, the RH refining in-place temperature is 1589 ℃, vacuum circulation degassing is carried out in the RH furnace, the vacuum degree is 160Pa, and the holding time is 18min. Control of [ Als ] during vacuum degassing]The content is 0.078%, 0.667% lanthanum-iron alloy (lanthanum-iron alloy La content is 30%) is added 4min before vacuum breaking, after vacuum breaking, the dissolved oxygen content [ O ] of molten steel is measured before feeding calcium wire]1.10ppm, and control [ Ca ] in molten steel after feeding calcium wire]The content is in the range of 0.002-0.010%. The soft argon blowing time is 10min, and the soft argon blowing amount is 0.007Nm 3 /(t.min). RH off-site temperature 1565 ℃.
Wherein the [ Ca ] content range is calculated and precisely controlled according to the following formula: 0.0023 to 0.0070%, and the content of the fluorescent dye after measurement is 0.0043%.
[Ca]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 。
TABLE 5 chemical composition (wt%) of RH refining in example 2 of the present invention
Figure BDA0003543548320000131
The detection shows that the content of rare earth lanthanum in the finished product is 791ppm, and the rare earth lanthanum yield is 39.55%. The inclusions are CaS, la 2 S 3 And La (La) 2 O 2 S, in La 2 S 3 Mainly, the content is more than 70%.
The chemical components of the obtained corrosion-resistant steel with high rare earth lanthanum content are shown in Table 6 in percentage by weight:
TABLE 6 chemical composition (wt%) of the rare earth steel finished product of example 2 of the present invention
Test number C Si Mn P S Als Ca Cr Ni Cu La
2 0.06 0.035 0.73 0.011 0.0061 0.078 0.0043 0.74 0.40 0.40 0.0791
Example 3
The corrosion resistant steel with the rare earth La content of 0.13 percent is designed and produced, and the refining control steps are as follows:
s1: LF refining in-situ temperature is 1569 ℃, la is not added into top slag in the LF refining process 2 O 3 Deoxidizing and desulfurizing white slag, and controlling molten steel S]The content is within the range of 0.006-0.008 percent, [ Als ]]The content is in the range of 0.09-0.15%, and the dissolved oxygen content [ O ] of the molten steel]<2.0ppm, adjusting the temperature, keeping the white slag for 23min, and measuring the dissolved oxygen content [ O ] of the molten steel before the molten steel comes out]=1.13 ppm. The white slag comprises the following components: 60%, siO 2 ：6.7％，Al 2 O 3 ：26％，La 2 O 3 :0%, mgO:5%, feO+MnO:0.2%, basicity CaO/SiO 2 9, and the slag thickness was 138mm. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm 3 /(t.min). The chemical composition for RH refining is shown in Table 7, and the LF off-site temperature is 1594 ℃.
Wherein the [ Als ] content range is calculated and precisely controlled according to the following formula, and the [ Als ] range is: 0.1229-0.1255%
[Als]＝9.77×10 -8 /[O] 3/2 +(0.47～0.49)[La]-(0.0156～0.0160)(La 2 O 3 ) 1/2 。
S2: and (3) after the LF furnace is refined and discharged, the LF furnace is operated to an RH furnace, the RH refining in-place temperature is 1585 ℃, vacuum circulation degassing is carried out in the RH furnace, the vacuum degree is 160Pa, and the holding time is 18min. Control of [ Als ] during vacuum degassing]The content is 0.1240%, 1.083% lanthanum-iron alloy (lanthanum-iron alloy La content is 30%) is added 5min before vacuum breaking, after vacuum breaking, before feeding calcium wire, the dissolved oxygen content [ O ] of molten steel is measured]1.05ppm, and controlling [ Ca ] in molten steel after feeding calcium wire]The content is in the range of 0.002-0.010%. The soft argon blowing time is 10min, and the soft argon blowing amount is 0.007Nm 3 /(t.min). RH off-site temperature 1565 ℃.
Wherein the [ Ca ] content range is calculated and precisely controlled according to the following formula: 0.0034 to 0.0098 percent, and 0.0067 percent after measurement.
[Ca]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 。
TABLE 7 chemical composition (wt%) of RH refining in example 3 of the present invention
Figure BDA0003543548320000141
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The detection shows that the content of rare earth lanthanum in the finished product is 1200ppm, and the rare earth lanthanum yield is 36.9%. The inclusions are CaS, la 2 S 3 And La (La) 2 O 2 S, in La 2 S 3 Mainly, the content is more than 70%.
The chemical components of the obtained corrosion-resistant steel with high rare earth lanthanum content are shown in the following table 8 in percentage by weight:
TABLE 8 chemical composition (wt%) of the rare earth steel finished product of example 3 of the present invention
Test number C Si Mn P S Als Ca Cr Ni Cu La
3 0.021 0.049 0.50 0.015 0.0076 0.1240 0.0067 0.31 0.12 0.21 0.120
Example 4
The corrosion resistant steel with the rare earth La content of 0.18 percent is designed and produced, and the refining control steps are as follows:
s1: LF refining in-situ temperature 1561 ℃, and La is added into top slag in LF refining process 2 O 3 To make La in slag 2 O 3 The content is 10 percent, the white slag is deoxidized and desulfurized, and the molten steel [ S ] is controlled]The content is within the range of 0.006-0.008 percent, [ Als ]]The content is in the range of 0.09-0.15%, and the dissolved oxygen content [ O ] of the molten steel]<2.0ppm, adjusting the temperature, keeping the white slag for 22min, and measuring the dissolved oxygen content [ O ] of the molten steel before the molten steel comes out]. The white slag comprises the following components: 50%, siO 2 ：5％，Al 2 O 3 ：25％，La 2 O 3 :10%, mgO:8%, feO+MnO:0.1% of alkalinity CaO/SiO 2 10 and 136mm thick. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm 3 /(t.min). The chemical composition for RH refining is shown in Table 9, and the LF off-site temperature is 1593 ℃.
Wherein the [ Als ] content range is calculated and precisely controlled according to the following formula, and the [ Als ] range is: 0.0910-0.0930%.
[Als]＝9.77×10 -8 /[O] 3/2 +(0.47～0.49)[La]-(0.0156～0.0160)(La 2 O 3 ) 1/2 。
S2: and (3) after the LF furnace is refined and discharged, the LF furnace is operated to an RH furnace, the RH refining in-place temperature is 1585 ℃, vacuum circulation degassing is carried out in the RH furnace, the vacuum degree is 160Pa, and the holding time is 18min. Control of [ Als ] during vacuum degassing]The content is 0.0920%, 1.5% lanthanum-iron alloy (lanthanum-iron alloy La content is 30%) is added 4min before vacuum breaking, after vacuum breaking, before feeding calcium wire, the dissolved oxygen content [ O ] of molten steel is measured]In ppm, control of [ Ca ] in molten steel after feeding calcium wire]The content is in the range of 0.002-0.010%. The soft argon blowing time is 10min, and the soft argon blowing amount is 0.007Nm 3 /(t.min). RH off-site temperature 1570 ℃.
Wherein the [ Ca ] content range is calculated and precisely controlled according to the following formula: 0.0031 to 0.0083%, and 0.0062% after measurement.
[Ca]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La] 2/3 。
TABLE 9 chemical composition (wt%) of RH refining in example 4 of the present invention
Figure BDA0003543548320000151
The detection shows that the content of rare earth lanthanum in the finished product is 1800ppm, and the rare earth lanthanum yield is 40%. The inclusion is La 2 S 3 And La (La) 2 O 2 S, in La 2 S 3 Mainly, the content is more than 70%.
The chemical components of the obtained corrosion-resistant steel with high rare earth lanthanum content are shown in the following table 10 in percentage by weight:
TABLE 10 chemical composition (wt%) of the final rare earth steel product of example 4 of the present invention
Test number C Si Mn P S Als Ca Cr Ni Cu La
4 0.05 0.25 1.37 0.011 0.0072 0.0920 0.0062 0.09 0.31 0.42 0.180
For the rare earth steels of the comparative example and the four examples, a dip corrosion test was performed, with corrosive liquid NaHSO 3 The relative corrosion rate of the comparative example is 70% compared with the plain carbon steel Q355B for 75h, and the corrosion rate is realThe relative etch rates of the examples were all below 65%.

Claims (5)

1. A refining control method of corrosion-resistant steel containing high rare earth lanthanum content is characterized in that the corrosion-resistant steel comprises the following chemical components in percentage by weight: less than or equal to 0.12 percent of C, less than or equal to 0.75 percent of Si, less than or equal to 1.5 percent of Mn, and less than or equal to Ni: 0.12-0.65%, cr: 0.30-1.25%, cu: 0.20-0.55%, P is less than or equal to 0.025%, S is less than or equal to 0.008%, la: 0.01-0.2%, and the balance of Fe and unavoidable impurities; the rare earth lanthanum compound mainly exists in the form of lanthanum sulfide in steel;
the refining control method comprises the following steps:
after tapping in a converter or an electric furnace, performing white slag operation in LF refining, controlling the slag thickness to be 130-160 mm, controlling the duration of the white slag to be more than 20min, and controlling molten steel [ S ]]The content is within the range of 0.006-0.008 percent, [ Als ]]The content is in the range of 0.04-0.15 percent, argon is blown softly before the molten steel is discharged, and O in the molten steel is controlled before the molten steel is discharged]<2.0ppm; the white slag comprises the following components in percentage by mass: caO: 50-65%, siO 2 ：5~7%，Al 2 O 3 ：25~30%，La 2 O 3 : 0-10%, mgO: 5-8%, feO+MnO < 0.5%, and alkalinity CaO/SiO 2 8-10;
step 2, after refining and discharging in an LF furnace, carrying out vacuum circulation degassing in an RH furnace, controlling the [ Als ] content to be in a range of 0.04-0.15%, adding rare earth lanthanum alloy 2-5 min before vacuum breaking, controlling the [ O ] content to be less than 2.0ppm in molten steel after vacuum breaking, then feeding a calcium line and soft argon blowing, and controlling the [ Ca ] content in the molten steel to be in a range of 0.002-0.010% after feeding the calcium line;
the La content of the corrosion resistant steel containing high rare earth lanthanum content is 0.01 to 0.05 percent]When the [ Als ] in the molten steel is controlled]Within the range of 0.04-0.06%, when the white slag contains La 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]More than or equal to 0.04 percent, when the white slag contains La 2 O 3 When the ratio is 0-5%, controlling molten steel [ Als ]]=0.05 to 0.06%; in steel [ Als ]]、[O]、[La]Content and in white slag (La) 2 O 3 ) The following relationship exists between the content: [ Als ]]=9.77×10 -8 /[O] 3/2 +(0.13~0.15)[La]-(0.0062~0.0064)(La 2 O 3 ) 1/2 In steel [ Ca ]]、[Als]、[La]The content has the following relation: [ Ca ]]=(0.017~0.075)[Als]+(0.0060~0.0120)[La] 2/3 ；
When the La content of the corrosion resistant steel containing high rare earth lanthanum content is (0.05-0.1%), controlling [ Als ] in molten steel]Within the range of 0.06-0.09%, when the white slag contains La 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]More than or equal to 0.06 percent, when the white slag contains La 2 O 3 When the ratio is 0-5%, controlling molten steel [ Als ]]=0.07 to 0.09%; in steel [ Als ]]、[O]、[La]Content and in white slag (La) 2 O 3 ) The following relationship exists between the content: [ Als ]]=9.77×10 -8 /[O] 3/2 +(0.32~0.34)[La]-(0.0124~0.0128)(La 2 O 3 ) 1/2 In steel [ Ca ]]、[Als]、[La]The content has the following relation: [ Ca ]]=(0.017~0.075)[Als]+(0.0060~0.0120)[La] 2/3 ；
The La content of the corrosion resistant steel containing high rare earth lanthanum content is [ 0.1-0.2%]When the [ Als ] in the molten steel is controlled]Within the range of 0.09-0.15%, when the white slag contains La 2 O 3 Is [ 5-10 ]]When the molten steel [ Als ] is controlled]=0.09 to 0.10%, when the white slag contains La 2 O 3 When the ratio is (1-5%), controlling the molten steel [ Als ]]=0.10 to 0.12%, when La in white slag 2 O 3 Is 0 to 1%]When the molten steel [ Als ] is controlled]=0.11 to 0.15%; in steel [ Als ]]、[O]、[La]Content and in white slag (La) 2 O 3 ) The following relationship exists between the content: [ Als ]]=9.77×10 -8 /[O] 3/2 +(0.47~0.49)[La]-(0.0156~0.0160)(La 2 O 3 ) 1/2 In steel [ Ca ]]、[Als]、[La]The content has the following relation: [ Ca ]]=(0.017~0.075)[Als]+(0.0060~0.0120)[La] 2/3 。
2. The method for controlling the refining of a corrosion-resistant steel having a high content of rare earth lanthanum according to claim 1, wherein the corrosion-resistant steel having a high content of rare earth lanthanum is a steel for a container or a railway vehicle.
3. The method according to claim 1, wherein in the step 2, the degree of vacuum of the RH furnace is 200Pa or less, and the holding time of vacuum circulation degassing is longer than 15min.
4. The refining control method of corrosion-resistant steel containing high rare earth lanthanum content according to claim 1, wherein in the step 1, argon is soft-blown for 5-8 min, and the soft-blown argon amount is 0.005-0.01 Nm 3 /(t.min); in the step 2, the soft argon blowing time is 8-10 min, and the soft argon blowing amount is 0.005-0.008 Nm 3 /(t·min)。
5. The method for controlling the refining of a corrosion-resistant steel having a high lanthanum content of rare earth according to any one of claims 1 to 4, wherein La is an inclusion of lanthanum in the corrosion-resistant steel 2 S 3 Mainly, the content is more than 70%.
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