CN114774763A - 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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CN114774763A
CN114774763A CN202210243137.4A CN202210243137A CN114774763A CN 114774763 A CN114774763 A CN 114774763A CN 202210243137 A CN202210243137 A CN 202210243137A CN 114774763 A CN114774763 A CN 114774763A
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rare earth
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steel
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CN114774763B (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
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Abstract

The invention discloses corrosion-resistant steel containing 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 converters and electric furnaces, 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 production of the existing corrosion-resistant steel. 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, Ni: 0.12 to 0.65%, Cr: 0.30 to 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 to 0.2 percent, and the balance of Fe and inevitable impurities; the compounds of the rare earth lanthanum are present in the steel predominantly in the form of lanthanum sulphide. Compared with common carbon steel, the service life of the steel is prolonged by more than 50% in an atmospheric corrosion environment, the yield of rare earth lanthanum is increased by more than 35%, the yield of rare earth is increased by 15% compared with the conventional rare earth, and the production cost is reduced 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 producing rare earth corrosion-resistant steel by converters and electric furnaces, and particularly relates to corrosion-resistant steel containing 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 being exposed in the atmosphere for a long time, so that the performance of the steel material is reduced, and the material is scrapped. In the beginning of the 20 th century, researchers found that the corrosion resistance effect of steel can be achieved by adding a proper amount of alloy elements such as P, Cu, Cr, Ni and the like, and the steel is also commonly used corrosion-resistant steel at present. The corrosion-resistant steel is widely applied to the manufacturing of containers and railway vehicles.
In recent years, research shows that the rare earth element lanthanum can obviously improve the corrosion resistance of steel, the novel rare earth corrosion-resistant steel added with lanthanum on the basis of the components of the traditional corrosion-resistant steel has the atmospheric corrosion resistance improved by 30-50% in 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 alloy elements such as Cu, Cr, Ni and the like, 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 effect of atmospheric corrosion resistance 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 remarkably improves the corrosion resistance of steel on the basis of large alloying amount (0.01-0.2%), but the lanthanum element has strong reducibility, not only has low yield in steel, but also is very easy to generate oxides and oxysulfide. In the existing production, how to ensure the high solid solution amount and lanthanum sulfide content of rare earth in the corrosion-resistant steel and avoid the generation of lanthanum oxide and lanthanum oxysulfide is very difficult for refining the corrosion-resistant steel with high lanthanum content.
Disclosure of Invention
In view of the above analysis and aiming at the defects in the prior art, the invention aims to provide the corrosion-resistant steel containing high rare earth lanthanum content and the refining control method thereof, so as to solve the problems that the yield of the rare earth lanthanum element is low (10-30%) and lanthanum oxide and lanthanum oxysulfide are easily generated in the production of the existing corrosion-resistant steel, so that the lanthanum element in the rare earth corrosion-resistant steel mainly exists in the form of lanthanum sulfide.
The purpose of the invention is mainly realized by the following technical scheme:
on one hand, the invention provides corrosion-resistant steel containing high rare earth lanthanum, 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, Ni: 0.12-0.65%, Cr: 0.30 to 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 to 0.2 percent, and the balance of Fe and inevitable impurities; the compounds of the rare earth lanthanum are present in the steel predominantly in the form of lanthanum sulphide.
Furthermore, the corrosion-resistant steel containing high rare earth lanthanum content is steel for containers and railway vehicles.
In addition, the invention also provides a refining control method of the corrosion-resistant steel containing high rare earth lanthanum, which comprises the following steps:
step 1, after tapping of a converter or an electric furnace, white slag operation in LF furnace refining is carried out, the slag thickness is controlled to be 130-160 mm, the white slag duration is longer than 20min, the [ S ] content of molten steel is controlled to be within the range of 0.006-0.008%, the [ Als ] content is controlled to be within the range of 0.04-0.15%, argon is softly blown before the molten steel is taken out of a station, and [ O ] in the molten steel is controlled to be less than 2.0ppm before the molten steel is taken out of the station;
and 2, after the LF furnace is refined and taken out of the station, performing vacuum circulation degassing in an RH furnace, controlling the content of [ Als ] within the range of 0.04-0.15%, adding rare earth lanthanum alloy 2-5 min before vacuum breaking, controlling [ O ] in the molten steel to be less than 2.0ppm after vacuum breaking, simultaneously feeding a calcium wire and soft argon blowing, and controlling the content of [ Ca ] in the molten steel within the 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: 50-65% of SiO2：5～7％，Al2O3：25～30％，La2O3: 0-10%, MgO: 5-8%, FeO + MnO less than 0.5%, and alkalinity CaO/SiO2Is 8 to 10.
Furthermore, in the step 2, the vacuum degree of the RH furnace is within 200Pa, and the vacuum cycle degassing retention time is more than 15 min.
Further, in the step 1, the soft argon blowing time is 5-8 min, and the soft argon blowing amount is 0.005-0.01 Nm3/(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 Nm3/(t·min)。
Further, when the La content of the corrosion-resistant steel containing high rare earth lanthanum is 0.01-0.05%, controlling Als in the molten steel to be 0.04-0.06%;
controlling [ Als ] in the molten steel to be within the range of 0.06-0.09% when the La content of the corrosion-resistant steel containing high rare earth lanthanum is (0.05-0.1%);
when the La content of the corrosion-resistant steel containing high rare earth lanthanum is 0.1-0.2%, controlling Als in the 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: 50-65% of SiO2：5～7％，Al2O3：25～30％，La2O3: 0-10%, MgO: 5-8%, FeO + MnO less than 0.5%, and alkalinity CaO/SiO28 to 10;
controlling Als in the molten steel to be within the range of 0.04-0.06% when the La content of the corrosion-resistant steel containing high rare earth lanthanum is 0.01-0.05%;
controlling Als in the molten steel to be within the range of 0.06-0.09% when the La content of the corrosion-resistant steel containing high rare earth lanthanum is (0.05-0.1%);
controlling Als in the molten steel to be within 0.09-0.15% when the La content of the corrosion-resistant steel containing high rare earth lanthanum is 0.1-0.2%;
the La content of the corrosion-resistant steel containing high rare earth lanthanum is 0.01-0.05%]When the white slag contains La2O3Is (5-10%)]While controlling the molten steel [ Als ]]More than or equal to 0.04 percent; when the white slag contains La2O3In the case of [ 0-5%), controlling molten steel [ Als ]]＝0.05～0.06％；
When the La content of the corrosion-resistant steel containing high rare earth lanthanum is (0.05-0.1%), La is contained in the white slag2O3Is (5-10%)]While controlling the molten steel [ Als ]]Not less than 0.06%; when the white slag contains La2O3In the case of [ 0-5%), controlling molten steel [ Als ]]＝0.07～0.09％；
The La content of the corrosion-resistant steel containing high rare earth lanthanum is 0.1-0.2%]When the white slag contains La2O3Is (5-10%)]While controlling the molten steel [ Als ]]0.09-0.10%; when the white slag contains La2O3When the content is (1-5%), controlling molten steel [ Als ]]0.10 to 0.12 percent; la in white slag2O3Is (0-1%)]While controlling the molten steel [ Als ]]＝0.11～0.15％。
Furthermore, the La content of the corrosion-resistant steel containing high rare earth lanthanum is 0.01-0.05%]In steel, [ Als ]]、[O]、[La]Content and (La) in white slag2O3) The contents have the following relationship: [ Als ]]＝9.77×10-8/[O]3/2+(0.13～0.15)[La]-(0.0062～0.0064)(La2O3)1/2In steel [ Ca ]]、[Als]、[La]The contents have the following relationship: [ 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 is (0.05-0.1%), the [ Als ] in the steel]、[O]、[La]Content and (La) in white slag2O3) The contents have the following relationship: [ Als ]]＝9.77×10-8/[O]3/2+(0.32～0.34)[La]-(0.0124～0.0128)(La2O3)1/2In steel [ Ca ]]、[Als]、[La]The contents have the following relationship: [ 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 is 0.1-0.2%]In steel, [ Als ]]、[O]、[La]Content and (La) in white slag2O3) The contents have the following relationship: [ Als ]]＝9.77×10-8/[O]3/2+(0.47～0.49)[La]-(0.0156～0.0160)(La2O3)1/2In steel, [ Ca ]]、[Als]、[La]The contents have the following relationship: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La]2/3。
Further, lanthanum inclusion in the corrosion resistant steel is represented by La2S3Mainly, it accounts for more than 70%.
Compared with the prior art, the invention has the following beneficial effects:
1. the content of rare earth La 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 the common carbon steel in an atmospheric corrosion environment.
2. The refining control method can improve the yield of the rare earth lanthanum to more than 35 percent, improve the yield by 15 percent compared with the prior rare earth yield and reduce the production cost by 25 yuan per ton of steel.
3. The refining control method of the invention ensures that the rare earth lanthanum compound mainly exists in the form of sulfide in the steel, thereby effectively improving the corrosion resistance of the steel.
Drawings
FIG. 1 is a graph of the dominance zone of La300ppm and Al 600ppm rare earth lanthanum inclusions in steel;
FIG. 2 is a graph of the predominant region of La800ppm and Al 900ppm of rare earth lanthanum inclusions in steel;
FIG. 3 is a graph of the dominance zone of La1500ppm, Al 1500ppm rare earth lanthanum inclusion in steel;
Detailed Description
Hereinafter, a corrosion-resistant steel with a high content of rare earth lanthanum and a refining control method thereof will be described in further detail with reference to specific examples, which are for illustrative purposes only and the present invention is not limited thereto. It should be noted that the contents of the components in the present specification are all mass percentages.
The invention provides corrosion-resistant steel with high rare earth lanthanum content, which is produced by a process route of converter (electric furnace) → LF furnace → RH furnace → continuous casting, wherein the corrosion-resistant steel is steel for containers and railway vehicles 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, Ni: 0.12-0.65%, Cr: 0.30 to 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 to 0.2 percent, and the balance of Fe and inevitable impurities; the compounds of rare earth lanthanum are present in the steel predominantly in the form of lanthanum sulphide.
In addition, the solid-solution rare earth and rare earth sulfide can become free metal particles under acidic conditions, and can promote the generation of hydroxy alpha iron, thereby achieving the purpose of inhibiting corrosion.
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 (electric furnace), the molten steel is transferred to an LF furnace, white slag operation is adjusted in the refining process of the LF furnace, and La can be additionally added into the white slag2O3，La2O3The adding amount of the slag is 0-10 percent (such as 0-1 percent), 1-5 percent, 0-5 percent and 5-10 percent of the total slag by weight percentage]). The duration of refining white slag in an LF furnace is more than 20min, and the molten steel is controlled to be S]The content is in the range of 0.006-0.008% [ Als%]The content is in the range of 0.04-0.15%. Determining the dissolved oxygen content [ O ] of molten steel before leaving the station]<2.0 ppm. Controlling the slag thickness to be 130-160 mm, the soft argon blowing time to be 5-8 min, and the soft argon blowing amount to be 0.005-0.01 Nm3/(t·min)。
In molten steel tapped from a converter (electric furnace), the contents of S < 0.01%, P < 0.015%, and Als: 0.04-0.15%, and the temperature is more than 1500 ℃.
Specifically, the white slag comprises CaO in percentage by mass: 50-65% of SiO2：5～7％，Al2O3：25～30％，La2O3: 0-10%, MgO: 5-8%, FeO + MnO less than 0.5%, and alkalinity CaO/SiO28 to 10 in molten steel, [ S ]]The content is controlled within a required range through the reaction balance of white slag and molten steel, and in addition, in order to inhibit the oxidation of rare earth lanthanum, the content is controlled by adding an aluminum block or feeding an aluminum wireThe oxygen content in the molten steel can be increased, and La can be additionally added into the white slag2O3And the oxidation of lanthanum is controlled by the reaction balance of the white slag and the molten steel.
It should be noted that, because of the restriction of the metallurgical physical and chemical reaction kinetics conditions, the process limit of [ O ] content control in the steel smelting is 1ppm, so that the dissolved oxygen content of the molten steel is controlled within the range of 1.0ppm to 2.0ppm, and the [ O ] content is indirectly controlled within the specified range by controlling the [ Als ] content in the steel in the refining process. The reason why the content of [ S ] is controlled in accordance with the control of the content of [ S ] in the normal steel grade is that most of the inclusions generated are oxides and free rare earth ions cannot be formed if the content of [ S ] is controlled in accordance with the control of the content of [ O ], and the control of the content of sulfur is intended to form sulfides to exert the effect of suppressing erosion. The white slag belongs to reducing slag and has the function of adsorbing oxygen elements in a molten steel contact layer, and meanwhile, the high-alkalinity white slag can fix S elements in the molten steel contact layer and transfer the elements to a surface layer through formed concentration difference.
In order to smoothly perform the refining process operation, the clearance height of a ladle after tapping from a converter (electric furnace) is controlled to be more than 160mm by considering the thickness requirement of a refining slag layer. And soft blowing argon before the refining of the LF furnace is finished, wherein the purity of the argon is over 99.99 percent, the principle of the soft blowing argon is that the slag surface is not cracked, and the soft blowing mainly promotes the floating of impurities and achieves the aim of homogenizing the components.
In addition, for the stability of the process and the coordination with the RH refining process, the temperature of the LF outlet molten steel is controlled to be 1590-1600 ℃.
Step S2: running the LF furnace to an RH furnace after the LF furnace is refined, performing vacuum cycle degassing in the RH furnace, and controlling [ Als ] during vacuum degassing]The content of the rare earth alloy is added 2-5 min before vacuum breaking, and the content of dissolved oxygen [ O ] in the molten steel is measured after vacuum breaking and before calcium feeding]<2.0ppm, [ Ca ] in molten steel was measured 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 Nm3/(t·min)。
It should be noted that, in the RH furnace, the content of [ Als ] is first controlled within a range of 0.04 to 0.15%, a reducing environment is created, and at this time, the oxygen content in the molten steel is also low, and then the rare earth lanthanum alloy is added, so as to avoid oxidation of lanthanum to the maximum extent. The calcium wire is fed to denature alumina inclusions, the calcium-aluminum compounds are in different combinations, and the calcium content is controlled to generate low-melting-point compounds. The soft argon blowing is used for promoting floating of the inclusion and removing gas. In addition, after vacuum breaking, soft argon blowing and calcium line feeding are carried out simultaneously, the purity of 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 removing effect is. The rare earth lanthanum alloy is added from an RH vacuum chamber, the rare earth lanthanum alloy is rare earth ferroalloy, wherein the lanthanum content is 30 percent, the iron content is 70 percent, the rare earth content of the rare earth ferroalloy is mainly limited by the processes of storage, transportation and the like, the rare earth content is too much, the transportation is not easy, and the rare earth lanthanum alloy is easy to oxidize and ignite.
Through a plurality of tests, the yield of the rare earth lanthanum is about 40 percent under the process system of the invention, so the feeding amount is designed according to the yield of 40 percent in the actual production. If the La content in the steel is designed to be 0.1%, the La content is 0.25%, and when the iron alloy with the La content of 30% is used, the addition amount of the rare earth iron alloy is 0.833% of the content of the final product.
For the stability of the process and the coordination with the next procedure, namely continuous casting, the temperature of the RH outbound molten steel is 1560-1570 ℃.
Specifically, according to the different content of the rare earth La designed in the molten steel, the more accurate process parameter setting is as follows:
c1: when the rare earth La content in the finished steel product is designed to be 0.01-0.05%, [ Als ] in the molten steel is controlled to be 0.04-0.06% in the LF furnace refining process in step S1.
Specifically, when the white slag contains La2O3Is (5-10%)]While controlling the molten steel [ Als ]]More than or equal to 0.04 percent; when the white slag contains La2O3When [ 0-5%), controlling molten steel [ Als ]]＝0.05～0.06％。
Further, [ Als ] in steel]、[O]、[La]Content and (La) in slag2O3) The contents have the following relationship:
[Als]＝9.77×10-8/[O]3/2+(0.13～0.15)[La]-(0.0062～0.0064)(La2O3)1/2i.e. in steel [ La ]]The design content of (1) is 0.01-0.05%]In the molten steel, [ O ]]<2.0ppm、[S]：0.006～0.008％、[Als]: 0.04-0.06% of slag (La)2O3) The addition amount of (a) is within the range of 0-10%, and [ Als ] can be adjusted according to the formula]In the slag (La)2O3) And (5) fine adjustment is carried out.
In step S2, in the RH furnace refining, the [ Ca ] in the molten steel after the calcium wire feeding]、[Als]、[La]The contents have the following relationship: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La]2/3I.e. in steel [ La ]]The design content of (1) is 0.01-0.05%]In the course of melting, [ Als ] is controlled in molten steel]In the range of 0.04-0.06%, the above formula can be applied according to [ Als ]]Specific content of (2) to [ Ca ] in steel]And (5) fine adjustment is carried out.
FIG. 1 is a graph of the predominant region of La300ppm and Al 600ppm rare earth lanthanum inclusions in steel, and [ O ] is observed]The content of [ S ] is 1.0ppm to 2.0ppm]The content of La is in the range of 0.006-0.008%2S3Compared with other lanthanum oxides and lanthanum oxysulfides, the method has production advantages.
C2: when the content of the rare earth La in the finished steel product 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 La2O3Is (5-10%)]While controlling the molten steel [ Als ]]Not less than 0.06%; when the white slag contains La2O3In the case of [ 0-5%), controlling molten steel [ Als ]]＝0.07～0.09％。
Further, [ Als ] in steel]、[O]、[La]Content and (La) in slag2O3) The contents have the following relationship:
[Als]＝9.77×10-8/[O]3/2+(0.32～0.34)[La]-(0.0124～0.0128)(La2O3)1/2i.e. in steel [ La ]]When the design content of (1) is 0.05-0.1%, [ O ] in the molten steel]<2.0ppm、[S]：0.006～0.008％、[Als]: 0.06-0.09% of slag, (La)2O3) The addition amount of (A) is in the range of 0-10%,can be according to the above formula to [ Als]And in slag (La)2O3) Fine tuning is performed.
In step S2, in the RH furnace refining, [ Ca ] is contained in the molten steel after the calcium wire is fed]、[Als]、[La]The contents have the following relationship: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La]2/3I.e. in steel [ La ]]When the design content of (2) is 0.05-0.1%, controlling [ Als ] in the molten steel]In the range of 0.06-0.09%, the above formula can be applied according to [ Als ]]Specific content of (2) to [ Ca ] in steel]And (5) fine adjustment is carried out.
FIG. 2 is a graph showing the predominant regions of La800ppm and Al 900ppm lanthanum inclusions in steel, indicating that [ O ]]The content of [ S ] is 1.0ppm to 2.0ppm]The content of La is in the range of 0.006-0.008%2S3Compared with other lanthanum oxide and lanthanum oxysulfide, the method has the advantages of formation.
C3: when the rare earth La content in the finished steel product is designed to be 0.1-0.2%, in step S1, [ Als ] in the molten steel is controlled to be 0.09-0.15% in the LF furnace refining process.
Specifically, when the white slag contains La2O3Is (5-10%)]While controlling the molten steel [ Als ]]0.09-0.10%; when the white slag contains La2O3When the content is (1-5%), controlling molten steel [ Als ]]0.10-0.12%; la in white slag2O3Is 0 to 1 percent]While controlling the molten steel [ Als ]]＝0.11～0.15％。
Further, [ Als ] in steel]、[O]、[La]Content and (La) in slag2O3) The contents have the following relationship:
[Als]＝9.77×10-8/[O]3/2+(0.47～0.49)[La]-(0.0156～0.0160)(La2O3)1/2i.e. in steel [ La ]]The design content of (A) is 0.1-0.2%]In the molten steel, [ O ]]<2.0ppm、[S]：0.006～0.008％、[Als]: 0.09-0.15% of slag (La)2O3) The addition amount of (a) is within the range of 0-10%, and [ Als ] can be adjusted according to the formula]And in slag (La)2O3) And (5) fine adjustment is carried out.
In step S2, in the RH furnace refining, the [ Ca ] in the molten steel after the calcium wire feeding]、[Als]、[La]The contents have the following relationship: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La]2/3I.e. in steel [ La ]]The design content of (A) is 0.1-0.2%]Controlling [ Als ] in molten steel]In the range of 0.09-0.15%, the above formula can be applied according to [ Als ]]Specific content of (2) to [ Ca ] in steel]Fine tuning is performed.
FIG. 3 is the dominant region of La1500ppm, Al 1500ppm rare earth lanthanum inclusion in steel, and [ O ] can be seen]The content of [ S ] is 1.0ppm to 2.0ppm]The content of La is in the range of 0.006-0.008%2S3Compared with other lanthanum oxides and lanthanum oxysulfides, the method has production advantages.
Through the embodiment, the yield of rare earth lanthanum in steel is more than 35 percent, and the inclusions are mainly La2S3Mainly, the service life of the steel is prolonged by more than 50 percent compared with the service life of the common carbon steel in the atmosphere corrosion environment.
Comparative example
The method is used for designing and producing the corrosion-resistant steel with the rare earth La content of 0.03 percent, and comprises the following refining control steps:
s1: LF refining is carried out at 1562 ℃ in place, white slag is produced for deoxidation and desulfurization, and [ S ] of molten steel is controlled]In the content of<0.0020％，[Als]The content is in the range of 0.03-0.04%, and the molten steel dissolved oxygen content is [ O ]]<5ppm, adjusting the temperature, keeping the white slag for 22min, and measuring the dissolved oxygen content [ O ] of the molten steel before leaving the station]3.50 ppm. The white slag comprises the following components: 55.45% of SiO2：11.57％，Al2O3: 27.64%, MgO: 7.06%, TFeO: 0.348%, MnO: 0.22% of alkalinity CaO/SiO24.8 and a slag thickness of 116 mm. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm3/(t · min). Chemical compositions for RH refining are shown in Table 1, and LF leaving station temperature 1594 ℃.
S2: and (3) operating the LF furnace to an RH furnace after the LF furnace is refined, wherein the RH refining in-place temperature is 1585 ℃, performing vacuum cycle degassing in the RH furnace with the vacuum degree of 160Pa, and keeping the vacuum degree for 18 min. Control of [ Als ] during vacuum degassing]The content is 0.035%, lanthanum-iron alloy (lanthanum-iron alloy La content is 30%) 0.4% is added 3min before breaking vacuum, after breaking vacuum and before feeding calcium wire, the content of oxygen dissolved in molten steel [ O ] is measured]3.35ppm, control [ Ca ] in molten steel after calcium line feeding]The content is in the range of 0.0002-0.0010%, and is 0.00035% after measurement. Soft blowing argon for 10minThe amount of argon was 0.007Nm3/(t · min). RH leaving station temperature 1562 ℃.
TABLE 1 RH refined chemical composition (wt%) 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 proves that the content of the rare earth lanthanum in the finished product is 312ppm, and the yield of the rare earth lanthanum is 26 percent. The inclusions are CaS and La2O3、La2S3And La2O2S, in La2O3Mainly accounts for more than 80 percent.
The chemical components of the obtained corrosion-resistant steel containing high rare earth lanthanum content are shown in the table 2 according to the weight percentage:
TABLE 2 chemical composition (wt%) of finished rare earth steel of comparative example 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 method is used for designing and producing the corrosion-resistant steel with the rare earth La content of 0.03 percent, and comprises the following refining control steps:
s1: the in-place temperature of LF refining is 1565 ℃, and La is not added into the top slag in the LF refining process2O3Deoxidizing and desulfurizing the white slag and controlling the molten steel]The content is in the range of 0.006-0.008% [ Als%]The content is in the range of 0.04-0.06%, and the content of oxygen dissolved in molten steel is [ O ]]<2.0ppm, adjusting temperature, keeping white slag for 22min, and measuring the dissolved oxygen content [ O ] of the molten steel before leaving the station]1.52 ppm. The white slag comprises the following components: 54% of SiO2：5.4％，Al2O3：30％，La2O3: 0%, MgO: 8%, FeO + MnO: 0.5% of alkalinity CaO/SiO210, the slag thickness was 139 mm. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm3/(t · min). Chemical compositions for RH refining are shown in Table 3, LF leaving station temperature 1592 ℃.
Wherein the [ Als ] content range is calculated and accurately controlled according to the following formula, and the [ Als ] range is as follows: 0.0560-0.0566%.
[Als]＝9.77×10-8/[O]3/2+(0.13～0.15)[La]-(0.0062～0.0064)(La2O3)1/2。
S2: and (3) operating the LF furnace to an RH furnace after the LF furnace is refined, wherein the RH refining in-place temperature is 1582 ℃, performing vacuum cycle degassing in the RH furnace with the vacuum degree of 160Pa, and keeping the vacuum degree for 18 min. Control of [ Als ] during vacuum degassing]0.0563%, adding 0.25% lanthanum-iron alloy (lanthanum-iron alloy La content 30%) 3min before breaking vacuum, measuring molten steel dissolved oxygen content [ O ] after breaking vacuum and before feeding calcium wire]1.35ppm, control [ 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 10min, and the soft argon blowing amount is 0.007Nm3/(t · min). RH leaving station 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 inventive example 1
Figure BDA0003543548320000121
Detection shows that the content of rare earth lanthanum in the finished product is 291ppm, and the yield of the rare earth lanthanum is 38.8%. The inclusions are CaS and La2S3And La2O2S, in La2S3Mainly, it accounts for more than 70%.
The chemical components of the obtained corrosion-resistant steel containing high rare earth lanthanum content are shown in the table 4 according to the weight percentage:
TABLE 4 chemical composition (wt%) of the finished rare earth steel of inventive example 1
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
Designing and producing the corrosion-resistant steel with the rare earth La content of 0.08 percent, wherein the refining control steps are as follows:
s1: the LF refining is carried out at the in-place temperature of 1563 ℃, and La is added into the top slag in the LF refining process2O3Making La in the slag2O35 percent of white slag is produced for deoxidation and desulfurization, and the [ S ] of molten steel is controlled]The content is in the range of 0.006-0.008% [ Als%]The content is in the range of 0.06-0.09%, and the content of oxygen dissolved in molten steel is [ O ]]<2.0ppm, adjusting temperature, keeping white slag for 25min, and measuring the dissolved oxygen content [ O ] of the molten steel before leaving the station]1.31 ppm. The white slag comprises the following components: 56% of SiO2：7％，Al2O3：25％，La2O3: 5%, MgO: 5%, FeO + MnO: 0.3% of alkalinity CaO/SiO28, and the slag thickness is 132 mm. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm3/(t · min). The chemical composition for RH refining is shown in Table 5, LF leaving station temperature 1592 ℃.
Wherein the [ Als ] content range is calculated and accurately controlled according to the following formula, and the [ Als ] range is as follows: 0.0765-0.0785%.
[Als]＝9.77×10-8/[O]3/2+(0.32～0.34)[La]-(0.0124～0.0128)(La2O3)1/2。
S2: and (3) operating the LF furnace to an RH furnace after the LF furnace is refined, wherein the RH refining in-place temperature is 1589 ℃, performing vacuum cycle degassing in the RH furnace with the vacuum degree of 160Pa, and keeping the vacuum degree for 18 min. Control of [ Als ] during vacuum degassing]The content is 0.078%, lanthanum-iron alloy (with La content of 30%) 0.667% is added 4min before breaking vacuum, and the content of oxygen dissolved in molten steel [ O ] is measured after breaking vacuum and before feeding calcium line]1.10ppm, control [ 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 10min, and the soft argon blowing amount is 0.007Nm3/(t · min). RH leaving station temperature 1565 ℃.
Wherein the [ Ca ] content range is calculated and precisely controlled according to the following formula: 0.0023-0.0070%, after measurement, 0.0043%.
[Ca]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La]2/3。
TABLE 5 RH refined chemical composition (wt%) in inventive example 2
Figure BDA0003543548320000131
Detection shows that the content of the rare earth lanthanum in the finished product is 791ppm, and the yield of the rare earth lanthanum is 39.55%. The inclusions are CaS and La2S3And La2O2S, in La2S3Mainly accounts for more than 70 percent.
The chemical components of the obtained corrosion-resistant steel containing high rare earth lanthanum content are shown in the table 6 according to the weight percentage:
TABLE 6 chemical composition (wt%) of the finished rare earth steel of inventive example 2
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
Designing and producing the corrosion-resistant steel with the rare earth La content of 0.13%, wherein the refining control steps are as follows:
s1: the LF refining is carried out at the in-place temperature of 1569 ℃, and La is not added into top slag in the LF refining process2O3Making white slag, deoxidizing, desulfurizing and controlling molten steel S]The content is in the range of 0.006-0.008% [ Als%]The content is in the range of 0.09-0.15%, and the content of oxygen dissolved in molten steel is [ O ]]<2.0ppm, adjusting the temperature, keeping the white slag for 23min, and measuring the dissolved oxygen content [ O ] of the molten steel before leaving the station]1.13 ppm. The white slag comprises the following components: 60% of SiO2：6.7％，Al2O3：26％，La2O3: 0%, MgO: 5%, FeO + MnO: 0.2% of alkalinity CaO/SiO29, the slag thickness is 138 mm. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm3/(t · min). The chemical composition for RH refining is shown in Table 7, LF leaving station temperature 1594 ℃.
Wherein the [ Als ] content range is calculated and accurately controlled according to the following formula, and the [ Als ] range is as follows: 0.1229-0.1255%
[Als]＝9.77×10-8/[O]3/2+(0.47～0.49)[La]-(0.0156～0.0160)(La2O3)1/2。
S2: and (3) operating the LF furnace to an RH furnace after the LF furnace is refined, wherein the RH refining in-place temperature is 1585 ℃, performing vacuum cycle degassing in the RH furnace with the vacuum degree of 160Pa, and keeping the vacuum degree for 18 min. Controlling [ Als ] during vacuum degassing]0.1240%, adding 1.083% lanthanum-iron alloy (lanthanum-iron alloy La content 30%) 5min before breaking vacuum, and measuring the dissolved oxygen content [ O ] of molten steel before feeding calcium line]1.05ppm, [ Ca ] in molten steel was controlled after calcium wire feeding]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 0.007Nm3/(t · min). RH leaving station temperature 1565 ℃.
Wherein the [ Ca ] content range is calculated and precisely controlled according to the following formula: 0.0034-0.0098%, and 0.0067% after measurement.
[Ca]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La]2/3。
TABLE 7 RH refined chemical composition (wt%) in inventive example 3
Figure BDA0003543548320000141
The detection proves that the content of the rare earth lanthanum in the finished product is 1200ppm, and the yield of the rare earth lanthanum is 36.9%. The inclusions are CaS and La2S3And La2O2S, in La2S3Mainly, it accounts for more than 70%.
The chemical components of the obtained corrosion-resistant steel containing high rare earth lanthanum content are shown in the table 8 according to the weight percentage:
table 8 chemical composition (wt%) of rare earth steel of final product of inventive example 3
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 method is used for designing and producing the corrosion-resistant steel with the rare earth La content of 0.18 percent, and comprises the following refining control steps:
s1: the LF refining is carried out at the in-situ temperature of 1561 ℃, and La is added into the top slag in the LF refining process2O3To make La in the slag2O3The content is 10 percent, the white slag is deoxidized and desulfurized, and the molten steel [ S ] is controlled]The content is in the range of 0.006-0.008% [ Als%]The content is in the range of 0.09-0.15%, and the content of oxygen dissolved in molten steel is [ O ]]<2.0ppm, adjusting the temperature, keeping the white slag for 22min, and measuring the dissolved oxygen content [ O ] of the molten steel before leaving the station]. The white slag comprises the following components: 50% of SiO2：5％，Al2O3：25％，La2O3: 10%, MgO: 8%, FeO + MnO: 0.1% of alkalinity CaO/SiO210, the slag thickness is 136 mm. The soft argon blowing time is 6min, and the soft argon blowing amount is 0.008Nm3/(t · min). The chemical composition for RH refining is shown in Table 9, LF leaving station temperature 1593 ℃.
Wherein the content range of [ Als ] is calculated and accurately controlled according to the following formula, and the range of [ Als ] is as follows: 0.0910-0.0930%.
[Als]＝9.77×10-8/[O]3/2+(0.47～0.49)[La]-(0.0156～0.0160)(La2O3)1/2。
S2: and (3) after the LF furnace is refined and discharged, operating the LF furnace to an RH furnace, wherein the RH refining in-place temperature is 1585 ℃, performing vacuum cycle degassing in the RH furnace with the vacuum degree of 160Pa, and keeping the vacuum degree for 18 min. Controlling [ 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 breaking vacuum, and the content of oxygen dissolved in molten steel [ O ] is measured after breaking vacuum and before feeding calcium wire]In ppm, control [ 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 10min, and the soft argon blowing amount is 0.007Nm3/(t · min). RH off-station temperature 1570 ℃.
Wherein the [ Ca ] content range is calculated and precisely controlled according to the following formula: 0.0031-0.0083%, after the determination, 0.0062%.
[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 the rare earth lanthanum in the finished product is 1800ppm, and the yield of the rare earth lanthanum is 40%. The inclusion is La2S3And La2O2S, in La2S3Mainly, it accounts for more than 70%.
The chemical components of the obtained corrosion-resistant steel containing high rare earth lanthanum content are shown in the table 10 according to the weight percentage:
TABLE 10 chemical composition (wt%) of the finished rare earth steel of inventive example 4
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
Aiming at the rare earth steel of the comparative example and the four examples, a soaking corrosion test is carried out, and a corrosive solution NaHSO3And the time is 75h, the relative corrosion rate of the comparative example is 70% compared with that of straight carbon steel Q355B, and the relative corrosion rates of the examples are all below 65%.

Claims (10)

1. The corrosion-resistant steel containing high rare earth lanthanum is characterized by comprising 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, Ni: 0.12-0.65%, Cr: 0.30 to 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 to 0.2 percent, and the balance of Fe and inevitable impurities; the compound of rare earth lanthanum is mainly present in the form of lanthanum sulfide in the steel.
2. The corrosion resistant steel containing a high rare earth lanthanum content of claim 1, wherein the corrosion resistant steel containing a high rare earth lanthanum content is a steel for containers and railway vehicles.
3. A refining control method for corrosion-resistant steel containing a high rare earth lanthanum content, for producing the corrosion-resistant steel of claim 1 or 2, comprising the steps of:
step 1, after tapping of a converter or an electric furnace, white slag operation in LF furnace refining is carried out, the slag thickness is controlled to be 130-160 mm, the white slag duration is longer than 20min, the [ S ] content of molten steel is controlled to be within the range of 0.006-0.008%, the [ Als ] content is controlled to be within the range of 0.04-0.15%, argon is softly blown before the molten steel is discharged, and [ O ] in the molten steel is controlled to be less than 2.0ppm before the molten steel is discharged;
and 2, after the LF furnace is refined and taken out of the station, performing vacuum circulation degassing in an RH furnace, controlling the content of [ Als ] within the range of 0.04-0.15%, adding rare earth lanthanum alloy 2-5 min before vacuum breaking, controlling [ O ] in the molten steel to be less than 2.0ppm after vacuum breaking, simultaneously feeding a calcium wire and soft argon blowing, and controlling the content of [ Ca ] in the molten steel within the range of 0.002-0.010% after feeding the calcium wire.
4. The method for refining and controlling the corrosion-resistant steel with the high content of the rare earth lanthanum according to claim 3, wherein in the step 1, the mass percentage of the white slag is as follows: CaO: 50-65% of SiO2：5～7％，Al2O3：25～30％，La2O3: 0 to 10%, MgO: 5-8%, FeO + MnO less than 0.5%, and alkalinity CaO/SiO2Is 8 to 10.
5. The method for controlling refining of corrosion-resistant steel with high content of lanthanum in claim 3, wherein in the step 2, the degree of vacuum of the RH furnace is within 200Pa, and the vacuum cycle degassing maintaining time is more than 15 min.
6. The refining control method of the corrosion-resistant steel containing high rare earth lanthanum according to claim 3, wherein in the step 1, the soft argon blowing time is 5-8 min, and the soft argon blowing amount is 0.005-0.01 Nm3V (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 Nm3/(t·min)。
7. The refining control method of the corrosion-resistant steel with high rare earth lanthanum content according to claim 3, characterized in that when the La content of the corrosion-resistant steel with high rare earth lanthanum content is [ 0.01-0.05% ], Als in molten steel is controlled to be in a range of 0.04-0.06%;
when the La content of the corrosion-resistant steel containing high rare earth lanthanum is (0.05-0.1%), controlling [ 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 is 0.1-0.2%, controlling Als in molten steel to be 0.09-0.15%.
8. The method for refining and controlling the corrosion-resistant steel containing the high content of the rare earth lanthanum according to claim 3, wherein in the step 1, the mass percentage of the white slag is as follows: CaO: 50-65% of SiO2：5～7％，Al2O3：25～30％，La2O3: 0-10%, MgO: 5-8%, FeO + MnO less than 0.5%, and alkalinity CaO/SiO28 to 10;
when the La content of the corrosion-resistant steel containing high rare earth lanthanum is 0.01-0.05%, controlling Als in molten steel to be 0.04-0.06%;
when the La content of the corrosion-resistant steel containing high rare earth lanthanum is (0.05-0.1%), controlling [ 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 is 0.1-0.2%, controlling Als in molten steel to be 0.09-0.15%.
The La content of the high rare earth lanthanum-containing corrosion-resistant steel is 0.01-0.05%]When the white slag contains La2O3Is (5-10%)]While controlling the molten steel [ Als ]]More than or equal to 0.04 percent; when the white slag contains La2O3In the case of [ 0-5%), controlling molten steel [ Als ]]＝0.05～0.06％；
When the La content of the corrosion-resistant steel containing high rare earth lanthanum is (0.05-0.1%), La is contained in white slag2O3Is (5-10%)]While controlling the molten steel [ Als ]]Not less than 0.06%; when the white slag contains La2O3In the case of [ 0-5%), controlling molten steel [ Als ]]＝0.07～0.09％；
Corrosion resistance containing high rare earth lanthanum contentThe La content of the steel is 0.1-0.2%]When the white slag contains La2O3Is (5-10%)]While controlling the molten steel [ Als ]]0.09-0.10%; when the white slag contains La2O3When the content is (1-5%), controlling molten steel [ Als ]]0.10 to 0.12 percent; when La in white slag2O3Is (0-1%)]While controlling the molten steel [ Als ]]＝0.11～0.15％。
9. The method for refining and controlling corrosion-resistant steel containing high content of rare earth lanthanum as claimed in claim 8, wherein La content of the corrosion-resistant steel containing high content of rare earth lanthanum is [ 0.01-0.05% ]]In steel, [ Als ]]、[O]、[La]Content and (La) in white slag2O3) The contents have the following relationship: [ Als ]]＝9.77×10-8/[O]3/2+(0.13～0.15)[La]-(0.0062～0.0064)(La2O3)1/2In steel, [ Ca ]]、[Als]、[La]The contents have the following relationship: [ 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 is (0.05-0.1%), the [ Als ] in the steel]、[O]、[La]Content and (La) in white slag2O3) The contents have the following relationship: [ Als ]]＝9.77×10-8/[O]3/2+(0.32～0.34)[La]-(0.0124～0.0128)(La2O3)1/2In steel [ Ca ]]、[Als]、[La]The contents have the following relationship: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La]2/3；
The La content of the high rare earth lanthanum-containing corrosion-resistant steel is 0.1-0.2%]In steel, [ Als ]]、[O]、[La]Content and (La) in white slag2O3) The contents have the following relationship: [ Als ]]＝9.77×10-8/[O]3/2+(0.47～0.49)[La]-(0.0156～0.0160)(La2O3)1/2In steel [ Ca ]]、[Als]、[La]The contents have the following relationship: [ Ca ]]＝(0.017～0.075)[Als]+(0.0060～0.0120)[La]2/3。
10. The method of controlling refining of a corrosion-resistant steel containing a high content of rare earth lanthanum as claimed in any one of claims 3 to 9,la as lanthanum inclusion in corrosion-resistant steel2S3Mainly, it accounts for more than 70%.
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