WO2021008299A1 - Polar steel smelting process controlling inclusions - Google Patents

Polar steel smelting process controlling inclusions Download PDF

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WO2021008299A1
WO2021008299A1 PCT/CN2020/096959 CN2020096959W WO2021008299A1 WO 2021008299 A1 WO2021008299 A1 WO 2021008299A1 CN 2020096959 W CN2020096959 W CN 2020096959W WO 2021008299 A1 WO2021008299 A1 WO 2021008299A1
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steel
alloy
deoxidation
polar
content
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Chinese (zh)
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李明
李强
李权辉
靳星
范益
周贺贺
尹雨群
潘路影
赵柏杰
楚觉非
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南京钢铁股份有限公司
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • 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
    • 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

Provided is a polar steel smelting process controlling inclusions. According to the process, MnS are formed and grown on the finely distributed Zr-Ti composite oxide nuclear particles formed early in the solidification stage through Zr-Ti deoxidation high-strength low-alloy steel. Therefore, the formed MnS covers fine spherical oxides and is uniformly dispersed in the steel, and the toughness of the steel is improved through the structure. Meanwhile, a manganese-depleted zone is presented around MnS, formation of acicular ferrite is promoted, and the toughness of the steel is further improved through fine-grained strengthening. In addition, through a large number of fine and evenly-dispersed oxides, the uniform steel structure is facilitated, and the strength is improved. Compared with traditional Al deoxidation, the ductility and toughness of steel plates are correspondingly improved, the corrosion current density is lower than 6mA/cm 2, corrosion active inclusions are reduced by half, the local corrosion rate of the steel plates is lowered, so that the service life of the steel plates is ensured, and the requirements for 36kg grade polar steel are met.

Description

一种控制夹杂物的极地用钢的冶炼方法Method for smelting polar steel for controlling inclusions 技术领域Technical field
本发明属于炼钢技术领域，具体涉及一种控制夹杂物的极地用钢的冶炼方法。The invention belongs to the technical field of steelmaking, and specifically relates to a method for smelting polar steel for controlling inclusions.
背景技术Background technique
目前国内对于极地领域的研究很少，还不具备极地破冰船设计能力，雪龙号船板钢从乌克兰进口，雪龙2号由芬兰设计。极地破冰船服役条件恶劣，要求钢板具有高强韧、高耐蚀、高耐磨、易焊接等特点。尤其在耐海水腐蚀方面有极高要求，这就需要极为苛刻的夹杂物、析出物、组织及微观缺陷等控制措施及能力。钢中夹杂物弥散分布在钢的内部及表面，在破冰船外部涂层破换之后，成为恶劣服役环境中的主要点蚀源头。钢种母材及焊接接头耐海水腐蚀的关键在于钢中腐蚀活性夹杂物的控制技术。钢板局部腐蚀速度取决于钢中腐蚀活性非金属杂质含量，钢中腐蚀活性夹杂物低于2个/mm 2即可有效降低钢板的局部腐蚀速度，从而保证钢板的服役寿命。 At present, there is very little research on the polar field in China, and there is no polar icebreaker design capability. The Xuelong ship plate steel is imported from Ukraine, and Xuelong 2 is designed by Finland. Polar icebreakers have poor service conditions, requiring steel plates with high strength, high corrosion resistance, high wear resistance, and easy welding. In particular, there are extremely high requirements for seawater corrosion resistance, which requires extremely harsh control measures and capabilities such as inclusions, precipitates, structures and micro-defects. The inclusions in the steel are dispersed in the interior and surface of the steel. After the outer coating of the icebreaker is broken, they become the main source of pitting corrosion in the harsh service environment. The key to seawater corrosion resistance of steel base materials and welded joints lies in the control technology of corrosion-active inclusions in steel. The local corrosion rate of the steel plate depends on the content of corrosion-active non-metallic impurities in the steel. The corrosion-active inclusions in the steel less than 2/mm 2 can effectively reduce the local corrosion rate of the steel plate, thereby ensuring the service life of the steel plate.
发明内容Summary of the invention
发明目的：为了克服现有技术的缺陷，本发明提供一种控制夹杂物的极地用钢的冶炼方法，该冶炼方法能够有效控制钢中的腐蚀活性夹杂物，降低钢板的局部腐蚀速度，从而保证钢板的服役寿命，满足极地用36kg级钢的要求。Objective of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a smelting method for controlling inclusions in polar steel. The smelting method can effectively control the corrosion active inclusions in the steel and reduce the local corrosion rate of the steel plate, thereby ensuring The service life of the steel plate meets the requirements of 36kg grade steel used in polar regions.
技术方案：本发明所述的一种控制夹杂物的极地用钢的冶炼方法，钢水冶炼的工艺路线包括KR铁水预处理→BOF顶底复吹转炉→LF精炼炉→RH精炼炉；Technical scheme: The method for smelting polar steel for controlling inclusions according to the present invention, the process route of molten steel smelting includes KR hot metal pretreatment→BOF top and bottom combined blowing converter→LF refining furnace→RH refining furnace;
步骤包括：The steps include:
(1)选择铁水中的有色金属的质量百分比含量Sn≤0.010％，Pb≤0.005％，As≤0.020，Sb≤0.010，Zn≤0.010时进行试制；铁水预处理保证入炉铁水S≤0.0020％，渣子扒除90％以上；(1) Select the mass percentage of non-ferrous metals in the molten iron as Sn≤0.010%, Pb≤0.005%, As≤0.020, Sb≤0.010, and Zn≤0.010 for trial production; the molten iron pretreatment ensures that the molten iron S≤0.0020%, Remove more than 90% of slag;
(2)在转炉底吹和炉况良好的情况下进行试制，转炉采用活性石灰进行多次造渣操作，将终点P、S均控制在0.008％以下；出钢自由氧控制在400-600ppm，终点碳的质量百分比含量控制在0.04-0.06％；(2) Trial production is carried out under the conditions of bottom blowing of the converter and good furnace conditions. The converter uses active lime for multiple slagging operations, and the end points P and S are controlled below 0.008%; the free oxygen of tapping is controlled at 400-600ppm, The mass percentage content of end-point carbon is controlled within 0.04-0.06%;
(3)转炉出钢用硅铁与微碳锰铁或者硅铁与锰进行初步脱氧和合金化；(3) Preliminary deoxidation and alloying of ferrosilicon and micro-carbon ferromanganese or ferrosilicon and manganese for converter tapping;
(4)到LF精炼炉后，测定并记录钢种的[O]含量，控制并保持钢水中氧含 量为20-60ppm；然后加入低铝Fe-Ti合金和Fe-Zr合金进行脱氧和合金化；(4) After going to the LF refining furnace, measure and record the [O] content of the steel, control and maintain the oxygen content of the molten steel at 20-60ppm; then add low-aluminum Fe-Ti alloy and Fe-Zr alloy for deoxidation and alloying ；
(5)低铝Fe-Ti合金和Fe-Zr合金进行脱氧和合金化后精炼3min以上；测定并记录钢中的[O]含量，如钢中存在10ppm以上自由氧，则加入10-20kg的Si-Ca-Ba合金进行补充脱氧；(5) Low-aluminum Fe-Ti alloys and Fe-Zr alloys are deoxidized and alloyed and refined for more than 3 minutes; measure and record the [O] content in the steel. If there is more than 10ppm free oxygen in the steel, add 10-20kg Supplementary deoxidation of Si-Ca-Ba alloy;
(6)然后进行脱S工艺操作，在脱S工艺过程中，禁止加铝线；脱S工艺完成后，根据目标成分加入Al线；(6) Then carry out the S removal process operation, during the S removal process, the aluminum wire is prohibited; after the S removal process is completed, the Al wire is added according to the target composition;
(7)RH精炼炉进行夹杂物去除和脱气处理，真空室吹氧，吹氧量50m 3，真空度≤5.0mbar条件下保持时间≥20min；在RH脱气处理完成后，在出站3min前，按照目标成分进行钙处理。 (7) RH refining furnace carries out inclusion removal and degassing treatment, oxygen blowing in the vacuum chamber, the oxygen blowing volume is 50m 3 , and the holding time is ≥20min under the condition of vacuum ≤5.0mbar; after the RH degassing treatment is completed, leave the station for 3min Before, calcium treatment was carried out according to the target ingredients.
其中，在转炉冶炼过程中，选择纯铁水操作或者选择以有色金属成分满足要求的废钢作为入炉料。Among them, in the converter smelting process, pure molten iron is selected for operation or scrap steel with non-ferrous metal components meeting the requirements is selected as the charge.
在所述步骤(3)中，进行初步的脱氧和合金化时，Si按0.10-0.18％配硅铁，Mn按0.93-0.98％配微碳锰铁或者金属锰。In the step (3), during preliminary deoxidation and alloying, Si is mixed with ferrosilicon at 0.10-0.18%, and Mn is mixed with carbon ferromanganese or metallic manganese at 0.93-0.98%.
在所述步骤(4)中，控制并保持钢水中氧含量为20-60ppm所采用的方法是：当钢水中氧含量大于60ppm，根据估算加入硅铁进行脱氧，直到钢水中的氧含量在20-60ppm。In the step (4), the method used to control and maintain the oxygen content in the molten steel at 20-60 ppm is: when the oxygen content in the molten steel is greater than 60 ppm, add ferrosilicon for deoxidation according to estimation, until the oxygen content in the molten steel is 20-60 ppm. -60ppm.
所述步骤(4)中，加入低铝Fe-Ti合金和Fe-Zr合金共计10-70kg进行脱氧和合金化。In the step (4), adding low-aluminum Fe-Ti alloy and Fe-Zr alloy totaling 10-70 kg for deoxidation and alloying.
所述步骤(4)中，低铝Fe-Ti合金和Fe-Zr合金一起加入，两者的加入量根据目标成分和合金含量进行折算，其中Zr含量的折算系数为60％。In the step (4), the low-aluminum Fe-Ti alloy and the Fe-Zr alloy are added together, and the addition amount of the two is converted according to the target composition and the alloy content, wherein the conversion coefficient of the Zr content is 60%.
所述步骤(6)中，在脱硫工艺过程时，在渣面均匀撒入适量Al粉，进行扩散脱氧；加Al粉时，氩气按静搅方式控制。In the step (6), during the desulfurization process, an appropriate amount of Al powder is evenly sprinkled on the slag surface for diffusion deoxidation; when the Al powder is added, the argon is controlled by static stirring.
有益效果：该冶炼方法中，通过Zr-Ti脱氧高强度低合金钢，在凝固阶段会在先形成的细小分布的Zr-Ti复合氧化物核质点上形成和生长MnS。因此，形成的MnS是覆盖在细小的球形氧化物之上的，并在钢中弥散均匀分布，这样的结构提高了钢韧性。同时，MnS是在Zr-Ti氧化物上形成，周围出现了贫锰区，会促进针状铁素体的形成，从而通过细晶强化进一步提高钢的韧性。此外，大量细小、均匀弥散分布的氧化物，有利于钢的组织均匀，强度提高。与传统的Al脱氧相比，Zr-Ti脱氧钢板的延展性和韧性相应得到提高，腐蚀电流密度低于 6mA/cm 2，腐蚀活性夹杂物减少了一半，能够降低钢板的局部腐蚀速度，从而保证钢板的服役寿命，满足极地用36kg级钢的要求。 Beneficial effects: In the smelting method, the high-strength low-alloy steel is deoxidized by Zr-Ti, and MnS is formed and grown on the finely distributed Zr-Ti composite oxide nuclei and particles formed in the solidification stage. Therefore, the formed MnS is covered on the fine spherical oxides and dispersed evenly in the steel. This structure improves the toughness of the steel. At the same time, MnS is formed on Zr-Ti oxide, and a manganese-poor zone appears around it, which will promote the formation of acicular ferrite, thereby further improving the toughness of steel through fine-grain strengthening. In addition, a large number of fine, uniformly dispersed oxides are conducive to the uniform structure of the steel and the increase in strength. Compared with the traditional Al deoxidation, the ductility and toughness of the Zr-Ti deoxidized steel sheet are correspondingly improved. The corrosion current density is lower than 6mA/cm 2 , and the corrosion active inclusions are reduced by half, which can reduce the local corrosion rate of the steel sheet, thereby ensuring The service life of the steel plate meets the requirements of 36kg grade steel used in polar regions.
附图说明Description of the drawings
图1是夹杂物形貌图；Figure 1 is the topography of inclusions;
图2是夹杂物尺寸分布图；Figure 2 is the size distribution diagram of inclusions;
图3是实施例夹杂物成分能谱分析图。Figure 3 is an energy spectrum analysis diagram of the inclusions in the embodiment.
具体实施方式Detailed ways
下面，以采用本发明所述的方法生产的一种特殊船板为例，对本发明做进一步详细说明。Hereinafter, taking a special ship board produced by the method of the present invention as an example, the present invention will be described in further detail.
生产该特殊船板的工艺流程包括KR铁水预处理→BOF顶底复吹转炉→LF精炼炉→RH精炼炉→连铸机。The technological process of producing this special ship plate includes KR hot metal pretreatment→BOF top and bottom combined blowing converter→LF refining furnace→RH refining furnace→continuous casting machine.
具体的步骤如下：The specific steps are as follows:
(1)选择铁水中的有色金属Sn，Pb，As，Bi，Sb，Zn的质量百分比含量交底时进行试制，其中，Sn≤0.010％，Pb≤0.005％，As≤0.020，Sb≤0.010，Zn≤0.010；铁水预处理保证入炉铁水S≤0.0020％，渣子扒除90％以上。(1) Select the non-ferrous metals Sn, Pb, As, Bi, Sb, and Zn in the molten iron for trial production. Among them, Sn≤0.010%, Pb≤0.005%, As≤0.020, Sb≤0.010, Zn ≤0.010; Hot metal pretreatment ensures that the molten iron S ≤0.0020% when entering the furnace, and more than 90% of slag is removed.
(2)为了降低原料中的各种杂质元素，选择纯铁水操作，或者选择以有色金属成分满足要求的优质废钢作为入炉料。在转炉底吹和炉况良好的情况下进行试制，转炉采用活性石灰进行多次造渣操作，将终点P、S均控制在0.008％以下；出钢自由氧控制在400-600ppm，终点碳的质量百分比含量控制在0.04-0.06％。(2) In order to reduce the various impurity elements in the raw materials, select pure molten iron operation, or select high-quality scrap steel with non-ferrous metal components that meet the requirements as the charge. Trial production is carried out under the condition of bottom blowing of the converter and good furnace conditions. The converter uses active lime for multiple slagging operations, and the end points P and S are controlled below 0.008%; the free oxygen of tapping is controlled at 400-600ppm, and the end point is carbon The mass percentage content is controlled within 0.04-0.06%.
(3)转炉出钢用硅铁与微碳锰铁或者硅铁与锰进行初步脱氧和合金化；Si按0.10-0.18％配硅铁，Mn按0.93-0.98％配微碳锰铁或者金属锰。并且不采用含Al材料进行脱氧与合金化。(3) Ferrosilicon and micro-carbon ferromanganese or ferrosilicon and manganese are used for initial deoxidation and alloying of converter steel; Si is 0.10-0.18% for ferrosilicon, and Mn is 0.93-0.98% for micro-carbon ferromanganese or metallic manganese. . And do not use Al-containing materials for deoxidation and alloying.
(4)到LF精炼炉后，用快速定氧探头测定并记录钢种的[O]含量，控制并保持钢水中氧含量为20-60ppm，当钢水中氧含量大于60ppm，根据估算加入硅铁进行脱氧，直到钢水中的氧含量在20-60ppm。然后加入低铝Fe-Ti合金和Fe-Zr合金10-70kg进行脱氧和合金化；低铝Fe-Ti合金和Fe-Zr合金一起加入，两者的加入量根据目标成分和合金含量进行折算，其中Zr含量的折算系数为60％。(4) After going to the LF refining furnace, use a fast oxygen probe to measure and record the [O] content of the steel grade, control and maintain the oxygen content in the molten steel at 20-60ppm, when the oxygen content in the molten steel is greater than 60ppm, add ferrosilicon according to estimation Perform deoxidation until the oxygen content in the molten steel is 20-60 ppm. Then add 10-70kg low-aluminum Fe-Ti alloy and Fe-Zr alloy for deoxidation and alloying; add low-aluminum Fe-Ti alloy and Fe-Zr alloy together, and the amount of both added is converted according to the target composition and alloy content. The conversion coefficient of Zr content is 60%.
(5)低铝Fe-Ti合金和Fe-Zr合金进行脱氧和合金化后精炼3min以上；用快速定氧探头测定并记录钢中的[O]含量，如钢中存在10ppm以上自由氧，则加 入10-20kg的Si-Ca-Ba合金进行补充脱氧。(5) Low-aluminum Fe-Ti alloy and Fe-Zr alloy are deoxidized and alloyed and refined for more than 3 minutes; use a rapid oxygen probe to measure and record the [O] content in the steel. If there is more than 10 ppm free oxygen in the steel, then Add 10-20kg of Si-Ca-Ba alloy for supplemental deoxidation.
(6)然后进行脱S工艺操作，在脱S工艺过程中，禁止加铝线，可以在渣面均匀撒入适量Al粉，进行扩散脱氧；加Al粉时，氩气按静搅方式控制。脱S工艺完成后，根据目标成分加入Al线。(6) Then carry out the S removal process. During the S removal process, the aluminum wire is forbidden, and an appropriate amount of Al powder can be evenly sprinkled on the slag surface for diffusion deoxidation; when adding Al powder, argon is controlled by static stirring. After the S removal process is completed, the Al wire is added according to the target composition.
(7)RH精炼炉进行夹杂物去除和脱气处理，真空室吹氧，吹氧量50m 3，真空度≤5.0mbar条件下保持时间≥20min；在RH脱气处理完成后，在出站3min前，按照目标成分进行钙处理。 (7) RH refining furnace carries out inclusion removal and degassing treatment, oxygen blowing in the vacuum chamber, the oxygen blowing volume is 50m 3 , and the holding time is ≥20min under the condition of vacuum ≤5.0mbar; after the RH degassing treatment is completed, leave the station for 3min Before, calcium treatment was carried out according to the target ingredients.
钢板冲击性能看，工艺改善后，钢板冲击性能明显改善，-120度钢板冲击≥200J，钢板平均抗拉强度605Mpa，富余量较大，钢板抗拉要求490-620Mpa，抗拉强度靠近上限。In terms of the impact performance of the steel plate, after the process is improved, the impact performance of the steel plate is obviously improved. The impact of the -120 degree steel plate is ≥200J, the average tensile strength of the steel plate is 605Mpa, and the margin is large.
一并结合结合图1-3，钢中腐蚀活性夹杂物1.87个/mm 2，平均电流密度5.78mA/cm 2，有效降低钢板的局部腐蚀速度，从而保证钢板的服役寿命。 Combined with Figure 1-3, the corrosion-active inclusions in the steel are 1.87/mm 2 and the average current density is 5.78mA/cm 2 , which effectively reduces the local corrosion rate of the steel plate, thereby ensuring the service life of the steel plate.

Claims (7)

  1. 一种控制夹杂物的极地用钢的冶炼方法，其特征在于，钢水冶炼的工艺路线包括KR铁水预处理→BOF顶底复吹转炉→LF精炼炉→RH精炼炉；A smelting method of polar steel for controlling inclusions, characterized in that the process route of molten steel smelting includes KR hot metal pretreatment→BOF top and bottom combined blowing converter→LF refining furnace→RH refining furnace;
    步骤包括：The steps include:
    (1)选择铁水中的有色金属的质量百分比含量Sn≤0.010％，Pb≤0.005％，As≤0.020，Sb≤0.010，Zn≤0.010时进行试制；铁水预处理保证入炉铁水S≤0.0020％，渣子扒除90％以上；(1) Select the mass percentage of non-ferrous metals in the molten iron as Sn≤0.010%, Pb≤0.005%, As≤0.020, Sb≤0.010, and Zn≤0.010 for trial production; the molten iron pretreatment ensures that the molten iron S≤0.0020%, Remove more than 90% of slag;
    (2)在转炉底吹和炉况良好的情况下进行试制，转炉采用活性石灰进行多次造渣操作，将终点P、S均控制在0.008％以下；出钢自由氧控制在400-600ppm，终点碳的质量百分比含量控制在0.04-0.06％；(2) Trial production is carried out under the conditions of bottom blowing of the converter and good furnace conditions. The converter uses active lime for multiple slagging operations, and the end points P and S are controlled below 0.008%; the free oxygen of tapping is controlled at 400-600ppm, The mass percentage content of end-point carbon is controlled within 0.04-0.06%;
    (3)转炉出钢用硅铁与微碳锰铁或者硅铁与锰进行初步脱氧和合金化；(3) Preliminary deoxidation and alloying of ferrosilicon and micro-carbon ferromanganese or ferrosilicon and manganese for converter tapping;
    (4)到LF精炼炉后，测定并记录钢种的[O]含量，控制并保持钢水中氧含量为20-60ppm；然后加入低铝Fe-Ti合金和Fe-Zr合金进行脱氧和合金化；(4) After going to the LF refining furnace, measure and record the [O] content of the steel, control and maintain the oxygen content of the molten steel at 20-60ppm; then add low-aluminum Fe-Ti alloy and Fe-Zr alloy for deoxidation and alloying ；
    (5)低铝Fe-Ti合金和Fe-Zr合金进行脱氧和合金化后精炼3min以上；测定并记录钢中的[O]含量，如钢中存在10ppm以上自由氧，则加入10-20kg的Si-Ca-Ba合金进行补充脱氧；(5) Low-aluminum Fe-Ti alloys and Fe-Zr alloys are deoxidized and alloyed and refined for more than 3 minutes; measure and record the [O] content in the steel. If there is more than 10ppm free oxygen in the steel, add 10-20kg Supplementary deoxidation of Si-Ca-Ba alloy;
    (6)然后进行脱S工艺操作，在脱S工艺过程中，禁止加铝线；脱S工艺完成后，根据目标成分加入Al线；(6) Then carry out the S removal process operation, during the S removal process, the aluminum wire is prohibited; after the S removal process is completed, the Al wire is added according to the target composition;
    (7)RH精炼炉进行夹杂物去除和脱气处理，真空室吹氧，吹氧量50m 3，真空度≤5.0mbar条件下保持时间≥20min；在RH脱气处理完成后，在出站3min前，按照目标成分进行钙处理。 (7) RH refining furnace carries out inclusion removal and degassing treatment, oxygen blowing in the vacuum chamber, the oxygen blowing volume is 50m 3 , and the holding time is ≥20min under the condition of vacuum ≤5.0mbar; after the RH degassing treatment is completed, leave the station for 3min Before, calcium treatment was carried out according to the target ingredients.
  2. 根据权利要求1所述的控制夹杂物的极地用钢的冶炼方法，其特征在于，在转炉冶炼过程中，选择纯铁水操作或者选择以有色金属成分满足要求的废钢作为入炉料。The smelting method of polar steel for controlling inclusions according to claim 1, characterized in that, in the converter smelting process, pure molten iron is selected for operation or scrap steel with non-ferrous metal composition meeting requirements is selected as the charging material.
  3. 根据权利要求1所述的控制夹杂物的极地用钢的冶炼方法，其特征在于，在所述步骤(3)中，进行初步的脱氧和合金化时，Si按0.10-0.18％配硅铁，Mn按0.93-0.98％配微碳锰铁或者金属锰。The smelting method of polar steel for controlling inclusions according to claim 1, characterized in that, in the step (3), during the preliminary deoxidation and alloying, Si is mixed with ferrosilicon by 0.10-0.18%, Mn is mixed with micro-carbon ferromanganese or metallic manganese at 0.93-0.98%.
  4. 根据权利要求1所述的控制夹杂物的极地用钢的冶炼方法，其特征在于，在所述步骤(4)中，控制并保持钢水中氧含量为20-60ppm所采用的方法是：当钢水中氧含量大于60ppm，根据估算加入硅铁进行脱氧，直到钢水中的氧含量 在20-60ppm。The method for smelting polar steel for controlling inclusions according to claim 1, characterized in that, in the step (4), the method used to control and maintain the oxygen content of the molten steel at 20-60 ppm is: If the oxygen content in the water is greater than 60ppm, it is estimated to add ferrosilicon for deoxidation until the oxygen content in the molten steel is 20-60ppm.
  5. 根据权利要求4所述的控制夹杂物的极地用钢的冶炼方法，其特征在于，所述步骤(4)中，加入低铝Fe-Ti合金和Fe-Zr合金共计10-70kg进行脱氧和合金化。The smelting method of polar steel for controlling inclusions according to claim 4, characterized in that, in the step (4), adding low-aluminum Fe-Ti alloy and Fe-Zr alloy totaling 10-70kg for deoxidation and alloying化.
  6. 根据权利要求5所述的控制夹杂物的极地用钢的冶炼方法，其特征在于，所述步骤(4)中，低铝Fe-Ti合金和Fe-Zr合金一起加入，两者的加入量根据目标成分和合金含量进行折算，其中Zr含量的折算系数为60％。The smelting method of polar steel for controlling inclusions according to claim 5, characterized in that, in the step (4), the low-aluminum Fe-Ti alloy and the Fe-Zr alloy are added together, and the amount of both added is based on The target composition and alloy content are converted, and the conversion coefficient of Zr content is 60%.
  7. 根据权利要求1所述的控制夹杂物的极地用钢的冶炼方法，其特征在于，所述步骤(6)中，在脱硫工艺过程时，在渣面均匀撒入适量Al粉，进行扩散脱氧；加Al粉时，氩气按静搅方式控制。The smelting method of polar steel for controlling inclusions according to claim 1, characterized in that, in the step (6), during the desulfurization process, a proper amount of Al powder is evenly sprinkled on the slag surface to perform diffusion deoxidation; When adding Al powder, argon is controlled by static stirring.
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