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WO2020093711A1 - Low-steel-grade pipeline clean steel and smelting process therefor - Google Patents

Low-steel-grade pipeline clean steel and smelting process therefor Download PDF

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Publication number
WO2020093711A1
WO2020093711A1 PCT/CN2019/093663 CN2019093663W WO2020093711A1 WO 2020093711 A1 WO2020093711 A1 WO 2020093711A1 CN 2019093663 W CN2019093663 W CN 2019093663W WO 2020093711 A1 WO2020093711 A1 WO 2020093711A1
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WO
WIPO (PCT)
Prior art keywords
low
steel
desulfurization
grade pipeline
pipeline clean
Prior art date
Application number
PCT/CN2019/093663
Other languages
French (fr)
Chinese (zh)
Inventor
翟冬雨
张媛钰
吴俊平
方磊
姜金星
刘继红
倪卫莹
杜海军
员强鹏
殷杰
刘汝营
刘仁杰
Original Assignee
南京钢铁股份有限公司
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Publication date
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Priority to KR1020217015715A priority Critical patent/KR20210091181A/en
Publication of WO2020093711A1 publication Critical patent/WO2020093711A1/en

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Classifications

    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/02—Use of electric or magnetic effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/10—Handling in a vacuum
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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

Definitions

  • the invention relates to the technical field of metallurgy, in particular to a low-grade pipeline clean steel and smelting process.
  • Pipeline steel is mainly used in petroleum, natural gas and other transportation pipelines.
  • the product performance should meet the extreme cold zone, high-pressure transportation, high-strength ultra-low temperature impact toughness, long-distance transportation must also have good welding performance, once there are a large number of large sizes Inclusions can cause welding cracks and ultrasonic flaw detection to fail, reducing the mechanical properties of the steel plate.
  • the present invention provides a low-grade pipeline clean steel, the chemical composition and mass percentage are as follows: C: 0.04% to 0.07%, Si: 0.10% to 0.35%, Mn: 1.00% to 1.50%, P ⁇ 0.015%, S: 0.0020% ⁇ 0.0050%, Nb: 0.030% ⁇ 0.070%, Ti: 0.006% ⁇ 0.020%, Ni ⁇ 0.30%, Cr ⁇ 0.30%, Cu ⁇ 0.30%, Al: 0.015% ⁇ 0.050 %, The balance is Fe and impurities.
  • the present invention formulates a pipeline clean steel and smelting process by systematically analyzing the generation mechanism of inclusions and combining with the actual production situation, which improves the cleanliness of molten steel and meets the requirements of customers.
  • Low-grade pipeline steel requires low-carbon, low-phosphorus, and low-sulfur. It mainly uses aluminum and lime as the main raw materials. Therefore, a large amount of CaO and Al 2 O 3 series inclusions will be generated, which are analyzed by thermodynamics:
  • Ca in the molten steel first reacts with the inclusions Al 2 O 3 and O and S in the steel to form CaO and CaS, which is combined with the remaining Al 2 O 3 to form CaO-Al 2 O 3 -CaS, then CaO in the inclusion reacts with S in the steel, resulting in a decrease in the content of CaO in the inclusion.
  • CaO reacts with S to a large extent. Therefore, by reducing the molten steel TO The content makes CaO and S in the inclusion react, resulting in a decrease in the CaO content in the inclusion, and eventually CaS-Al 2 O 3 will be formed.
  • the low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.060%, Si: 0.281%, Mn: 1.011%, P: 0.013%, S: 0.0041%, Nb: 0.038% , Ti: 0.013%, Ni: 0.019%, Cr: 0.02%, Cu: 0.019%, Alt: 0.037%, Mo: 0.007%, V: 0.001%, Ca: 0.0019%, Ceq: 0.27%, Pcm: 0.13% .
  • the low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.041%, Si: 0.121%, Mn: 1.191%, P: 0.012%, S: 0.0030%, Nb: 0.066% , Ti: 0.012%, Ni: 0.011%, Cr: 0.03%, Cu: 0.011%, Alt: 0.033%, Mo: 0.008%, V: 0.001%, Ca: 0.0016%, Ceq: 0.28%, Pcm: 0.13% .
  • the low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.050%, Si: 0.181%, Mn: 1.311%, P: 0.012%, S: 0.0031%, Nb: 0.066% , Ti: 0.011%, Ni: 0.019%, Cr: 0.02%, Cu: 0.011%, Alt: 0.036%, Mo: 0.009%, V: 0.001%, Ca: 0.0018%, Ceq: 0.27%, Pcm: 0.13% .
  • the low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.046%, Si: 0.304%, Mn: 1.236%, P: 0.011%, S: 0.0048%, Nb: 0.053% , Ti: 0.013%, Ni: 0.019%, Cr: 0.03%, Cu: 0.011%, Alt: 0.039%, Mo: 0.006%, V: 0.001%, Ca: 0.0019%, Ceq: 0.28%, Pcm: 0.13% .
  • the low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.054%, Si: 0.228%, Mn: 1.120%, P: 0.009%, S: 0.0021%, Nb: 0.033% , Ti: 0.011%, Ni: 0.011%, Cr: 0.02%, Cu: 0.011%, Alt: 0.035%, Mo: 0.009%, V: 0.001%, Ca: 0.0016%, Ceq: 0.27%, Pcm: 0.13% .
  • Another object of the present invention is to provide a low-grade pipeline clean steel smelting process, specifically including the following process:
  • the desulfurization station uses liquid calcium oxide and magnesium powder to mix and spray for desulfurization. After the desulfurization, deep slag treatment is carried out.
  • the desulfurization standard of the desulfurization station is ⁇ 0.005%.
  • the converter uses scrap steel to ensure that the sulfur in the steel is ⁇ 0.010%. Add strong aluminum block for strong deoxidation, adding 35kg / 100ppm to prepare for LF desulfurization;
  • S2 and LF are mainly responsible for desulfurization and alloying, and the finished sulfur is set to 0.002% ⁇ 0.005%;
  • the vacuum degree is less than 3MPa
  • the pure vacuum time is more than 18min
  • 150m-200m seamless pure calcium wire is fed for calcium treatment, and the calcium treatment is followed by 12 minutes of static stirring;
  • the superheat is controlled at 30 °C ⁇ 35 °C, with the use of electromagnetic stirring technology, to ensure that the low power rating reaches YB / T 4003 standard C1.0 or B0.5
  • the finished low-grade pipeline steel has fewer alloy elements and a lower alloying pressure, and the finished sulfur is set to 0.002% to 0.005%.
  • the main purpose is to obtain high-sulfur molten steel for the production of high melting point CaS -Al 2 O 3 type solid inclusions provide prerequisites;
  • the low vacuum degree and extended vacuum time of the present invention can minimize the gas content in the molten steel and improve the cleanliness of the molten steel;
  • the superheat degree of the CCM casting process is controlled at 30 °C ⁇ 35 °C, the high superheat degree is conducive to improving the kinetics and thermodynamic conditions of the molten steel in the process of static stirring, transfer, casting, and ensuring that the solid inclusions obtained are fully removed. , Effectively improve the cleanliness of molten steel;
  • the CCM casting process is combined with the use of electromagnetic stirring technology to reduce center segregation and prevent the formation of MnS inclusions.
  • the present invention provides a low-grade pipeline clean steel, the chemical composition and mass percentage are as follows: C: 0.04% ⁇ 0.07%, Si: 0.10% ⁇ 0.35%, Mn: 1.00% ⁇ 1.50%, P ⁇ 0.015%, S : 0.0020% to 0.0050%, Nb: 0.030% to 0.070%, Ti: 0.006% to 0.020%, Ni ⁇ 0.30%, Cr ⁇ 0.30%, Cu ⁇ 0.30%, Al: 0.015% to 0.050%, the balance is Fe And impurities.
  • the smelting process includes the following processes:
  • the desulfurization station uses liquid calcium oxide and magnesium powder to mix and spray for desulfurization. After the desulfurization, deep slag treatment is carried out.
  • the desulfurization standard of the desulfurization station is ⁇ 0.005%.
  • the converter uses scrap steel to ensure that the sulfur in the steel is ⁇ 0.010%. Add strong aluminum block for strong deoxidation, adding 35kg / 100ppm to prepare for LF desulfurization;
  • S2 and LF are mainly responsible for desulfurization and alloying, and the finished sulfur is set to 0.002% ⁇ 0.005%;
  • the vacuum degree is less than 3MPa
  • the pure vacuum time is more than 18min
  • 150m-200m seamless pure calcium wire is fed for calcium treatment, and the calcium treatment is followed by 12 minutes of static stirring;
  • the superheat is controlled at 30 °C ⁇ 35 °C, combined with the use of electromagnetic stirring technology, to ensure that the low power rating reaches YB / T 4003 standard C1.0 or B0.5.
  • Example 1 0.060 1.011 0.013 0.0041 0.281 0.019 0.02 0.019
  • Example 2 0.041 1.191 0.012 0.0030 0.121 0.011 0.03 0.011
  • Example 3 0.050 1.311 0.012 0.0031 0.181 0.019 0.02 0.011
  • Example 4 0.046 1.236 0.011 0.0048 0.304 0.019 0.03 0.011
  • Example 5 0.054 1.120 0.009 0.0021 0.228 0.011 0.02 0.011
  • Example 1 0.037 0.038 0.007 0.001 0.013 0.0019 0.27 0.13
  • Example 2 0.033 0.066 0.008 0.001 0.012 0.0016 0.28 0.13
  • Example 3 0.036 0.060 0.009 0.001 0.011 0.0018 0.27 0.13
  • Example 4 0.039 0.053 0.006 0.001 0.013 0.0019 0.28
  • the invention analyzes the generation mechanism of inclusions in detail, and obtains stable CaS-Al 2 O 3 type solid inclusions through special composition design and calcium treatment technology.
  • the reasonable 30-35 degree high superheat control ensures the inclusions
  • the objects are lifted and removed to obtain clean molten steel with higher purity of molten steel, which effectively improves the quality of molten steel and meets customer requirements. After the process is improved, the cleanliness of the molten steel is effectively improved, the harm of the large-size inclusions on the performance of the steel plate is reduced, and the welding performance after pipe making is improved, and the economic benefit is remarkable
  • the present invention may have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Disclosed is a low-steel-grade pipeline clean steel, relating to the technical field of metallurgy. The low-steel-grade pipeline clean steel has the following chemical ingredients and mass percentages thereof: C: 0.04-0.07％, Si: 0.10-0.35％, Mn: 1.00-1.50％, P≤0.015％, S: 0.0020-0.0050％, Nb: 0.030-0.070％, Ti: 0.006-0.020％, Ni≤0.30％, Cr≤0.30％, Cu≤0.30％, Al: 0.015-0.050％, and the balance being Fe and impurities. In the invention, an accurate system analysis is carried out on a formation control mechanism of inclusions, a reasonable component design is adopted, a calcium treatment process is carried out after an RH vacuum treatment, and the degree of superheating is reasonably controlled, such that the purpose of improving the purity of the molten steel is achieved, the internal quality of the steel is improved, and the economic benefits are improved.

Description

一种低钢级管线洁净钢及冶炼工艺Low-grade pipeline clean steel and smelting process 技术领域Technical field
本发明涉及冶金技术领域，特别是涉及一种低钢级管线洁净钢及冶炼工艺。The invention relates to the technical field of metallurgy, in particular to a low-grade pipeline clean steel and smelting process.
背景技术Background technique
随着世界经济能源需求的不断增加，对石油、天然气的管道输送依赖越来越大，输送管道的服役环境要求越来越苛刻，输送管道的安全可靠离不开钢材质量保障，具有较高洁净度、较好低温韧性的钢板才能占据市场。管线钢主要用于石油、天然气等输送管道，产品性能应满足极寒地带、高压输送，高强度超低温冲击韧性，长距离输送还必须具有良好的焊接性能，一旦管线钢板母材存在大量的大尺寸夹杂物，会导致焊接裂纹及超声波探伤不合格，降低钢板力学性能。With the increasing demand for energy in the world economy, the dependence on pipeline transportation of oil and natural gas is becoming greater and greater, and the service environment requirements of the pipeline are becoming more and more demanding. The safety and reliability of the pipeline are inseparable from the quality assurance of the steel, and they have high clean Steel plate with good temperature and good low temperature toughness can occupy the market. Pipeline steel is mainly used in petroleum, natural gas and other transportation pipelines. The product performance should meet the extreme cold zone, high-pressure transportation, high-strength ultra-low temperature impact toughness, long-distance transportation must also have good welding performance, once there are a large number of large sizes Inclusions can cause welding cracks and ultrasonic flaw detection to fail, reducing the mechanical properties of the steel plate.
发明内容Summary of the invention
为了解决以上技术问题，本发明提供一种低钢级管线洁净钢，其化学成分及质量百分比如下：C:0.04％～0.07％，Si:0.10％～0.35％，Mn:1.00％～1.50％，P≤0.015％，S:0.0020％～0.0050％，Nb:0.030％～0.070％，Ti:0.006％～0.020％，Ni≤0.30％，Cr≤0.30％，Cu≤0.30％，Al:0.015％～0.050％，余量为Fe和杂质。In order to solve the above technical problems, the present invention provides a low-grade pipeline clean steel, the chemical composition and mass percentage are as follows: C: 0.04% to 0.07%, Si: 0.10% to 0.35%, Mn: 1.00% to 1.50%, P ≤ 0.015%, S: 0.0020% ~ 0.0050%, Nb: 0.030% ~ 0.070%, Ti: 0.006% ~ 0.020%, Ni ≤ 0.30%, Cr ≤ 0.30%, Cu ≤ 0.30%, Al: 0.015% ～ 0.050 %, The balance is Fe and impurities.
技术效果：本发明通过对夹杂物产生机理进行系统分析，结合生产实际情况，制定了一种管线洁净钢及冶炼工艺，提高了钢水的洁净度，满足了客户要求。低钢级管线钢要求低碳、低磷、低硫，主要采用铝、石灰为主要原料，因此，会产生大量的CaO、Al 2O 3系列夹杂物，通过热力学进行分析： Technical effect: The present invention formulates a pipeline clean steel and smelting process by systematically analyzing the generation mechanism of inclusions and combining with the actual production situation, which improves the cleanliness of molten steel and meets the requirements of customers. Low-grade pipeline steel requires low-carbon, low-phosphorus, and low-sulfur. It mainly uses aluminum and lime as the main raw materials. Therefore, a large amount of CaO and Al 2 O 3 series inclusions will be generated, which are analyzed by thermodynamics:
[Ca]+1/3(Al 2O 3)→(CaO)+2/3[Al] [Ca] +1/3 (Al 2 O 3 ) → (CaO) +2/3 [Al]
ΔG 0＝-356297.7+71.8T ΔG 0 = -356297.7 + 71.8T
[Ca]+[O]→(CaO)[Ca] + [O] → (CaO)
ΔG 0＝-645421+146T ΔG 0 = -645421 + 146T
[Ca]+[S]→(CaS)[Ca] + [S] → (CaS)
ΔG 0＝-530900+116.2T ΔG 0 = -530900 + 116.2T
(CaO)+[S]→(CaS)+[O](CaO) + [S] → (CaS) + [O]
ΔG 0＝114521-29.8T ΔG 0 = 114521-29.8T
当RH真空结束后进行钙处理，按热力学分析可知，钢液中Ca先与夹杂物Al 2O 3以及钢中的O、S反应，生成CaO及CaS，并与剩余的Al 2O 3结合形成CaO-Al 2O 3-CaS，然后夹杂物中CaO与钢中S发生反应，导致夹杂物中CaO含量降低，由于在低的T.O含量下，CaO与S反应程度大，因此，通过降低钢水T.O含量，使夹杂物中CaO与S发生反应，导致夹杂物中CaO含量降低，最终就会形成CaS-Al 2O 3。 After the RH vacuum is finished, calcium treatment is carried out. According to thermodynamic analysis, Ca in the molten steel first reacts with the inclusions Al 2 O 3 and O and S in the steel to form CaO and CaS, which is combined with the remaining Al 2 O 3 to form CaO-Al 2 O 3 -CaS, then CaO in the inclusion reacts with S in the steel, resulting in a decrease in the content of CaO in the inclusion. At a low TO content, CaO reacts with S to a large extent. Therefore, by reducing the molten steel TO The content makes CaO and S in the inclusion react, resulting in a decrease in the CaO content in the inclusion, and eventually CaS-Al 2 O 3 will be formed.
本发明进一步限定的技术方案是：The technical solution further defined by the present invention is:
前所述的一种低钢级管线洁净钢，其化学成分及质量百分比如下：C:0.060％，Si:0.281％，Mn:1.011％，P:0.013％，S:0.0041％，Nb:0.038％，Ti:0.013％，Ni:0.019％，Cr:0.02％，Cu:0.019％，Alt:0.037％，Mo:0.007％，V:0.001％，Ca:0.0019％，Ceq:0.27％，Pcm:0.13％。The low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.060%, Si: 0.281%, Mn: 1.011%, P: 0.013%, S: 0.0041%, Nb: 0.038% , Ti: 0.013%, Ni: 0.019%, Cr: 0.02%, Cu: 0.019%, Alt: 0.037%, Mo: 0.007%, V: 0.001%, Ca: 0.0019%, Ceq: 0.27%, Pcm: 0.13% .
前所述的一种低钢级管线洁净钢，其化学成分及质量百分比如下：C:0.041％，Si:0.121％，Mn:1.191％，P:0.012％，S:0.0030％，Nb:0.066％，Ti:0.012％，Ni:0.011％，Cr:0.03％，Cu:0.011％，Alt:0.033％，Mo:0.008％，V:0.001％，Ca:0.0016％，Ceq:0.28％，Pcm:0.13％。The low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.041%, Si: 0.121%, Mn: 1.191%, P: 0.012%, S: 0.0030%, Nb: 0.066% , Ti: 0.012%, Ni: 0.011%, Cr: 0.03%, Cu: 0.011%, Alt: 0.033%, Mo: 0.008%, V: 0.001%, Ca: 0.0016%, Ceq: 0.28%, Pcm: 0.13% .
前所述的一种低钢级管线洁净钢，其化学成分及质量百分比如下：C:0.050％，Si:0.181％，Mn:1.311％，P:0.012％，S:0.0031％，Nb:0.066％，Ti:0.011％，Ni:0.019％，Cr:0.02％，Cu:0.011％，Alt:0.036％，Mo:0.009％，V:0.001％，Ca:0.0018％，Ceq:0.27％，Pcm:0.13％。The low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.050%, Si: 0.181%, Mn: 1.311%, P: 0.012%, S: 0.0031%, Nb: 0.066% , Ti: 0.011%, Ni: 0.019%, Cr: 0.02%, Cu: 0.011%, Alt: 0.036%, Mo: 0.009%, V: 0.001%, Ca: 0.0018%, Ceq: 0.27%, Pcm: 0.13% .
前所述的一种低钢级管线洁净钢，其化学成分及质量百分比如下：C:0.046％，Si:0.304％，Mn:1.236％，P:0.011％，S:0.0048％，Nb:0.053％，Ti:0.013％，Ni:0.019％，Cr:0.03％，Cu:0.011％，Alt:0.039％，Mo:0.006％，V:0.001％，Ca:0.0019％，Ceq:0.28％，Pcm:0.13％。The low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.046%, Si: 0.304%, Mn: 1.236%, P: 0.011%, S: 0.0048%, Nb: 0.053% , Ti: 0.013%, Ni: 0.019%, Cr: 0.03%, Cu: 0.011%, Alt: 0.039%, Mo: 0.006%, V: 0.001%, Ca: 0.0019%, Ceq: 0.28%, Pcm: 0.13% .
前所述的一种低钢级管线洁净钢，其化学成分及质量百分比如下：C:0.054％，Si:0.228％，Mn:1.120％，P:0.009％，S:0.0021％，Nb:0.033％，Ti:0.011％，Ni:0.011％，Cr:0.02％，Cu:0.011％，Alt:0.035％，Mo:0.009％，V:0.001％，Ca:0.0016％，Ceq:0.27％，Pcm:0.13％。The low-grade pipeline clean steel mentioned above has the following chemical composition and mass percentage: C: 0.054%, Si: 0.228%, Mn: 1.120%, P: 0.009%, S: 0.0021%, Nb: 0.033% , Ti: 0.011%, Ni: 0.011%, Cr: 0.02%, Cu: 0.011%, Alt: 0.035%, Mo: 0.009%, V: 0.001%, Ca: 0.0016%, Ceq: 0.27%, Pcm: 0.13% .
本发明的另一目的在于提供一种低钢级管线洁净钢冶炼工艺，具体包括以下流程：Another object of the present invention is to provide a low-grade pipeline clean steel smelting process, specifically including the following process:
S1、脱硫站采用液态氧化钙与镁粉混合喷吹的方式进行脱硫，脱硫结束后进行深扒渣处理，脱硫站脱硫标准≤0.005％，转炉使用废钢，确保出钢硫达到≤0.010％，转炉出钢加铝块进行强脱氧，加入量为35kg/100ppm，为LF脱硫做好准备；S1. The desulfurization station uses liquid calcium oxide and magnesium powder to mix and spray for desulfurization. After the desulfurization, deep slag treatment is carried out. The desulfurization standard of the desulfurization station is ≤0.005%. The converter uses scrap steel to ensure that the sulfur in the steel is ≤0.010%. Add strong aluminum block for strong deoxidation, adding 35kg / 100ppm to prepare for LF desulfurization;
S2、LF主要负责脱硫及合金化，成品硫设定为0.002％～0.005％；S2 and LF are mainly responsible for desulfurization and alloying, and the finished sulfur is set to 0.002% ～ 0.005%;
S3、RH真空处理，真空度小于3MPa，纯真空时间18min以上，RH真空结束后喂入150m～200m无缝纯钙线进行钙处理，钙处理后进行12分钟静搅；S3, RH vacuum treatment, the vacuum degree is less than 3MPa, the pure vacuum time is more than 18min, after the RH vacuum is completed, 150m-200m seamless pure calcium wire is fed for calcium treatment, and the calcium treatment is followed by 12 minutes of static stirring;
S4、CCM浇注过程中过热度控制在30℃～35℃，配合使用电磁搅拌技术，确保低倍评级达到YB/T 4003标准C1.0或B0.5以内。S4, CCM during the casting process, the superheat is controlled at 30 ℃ ~ 35 ℃, with the use of electromagnetic stirring technology, to ensure that the low power rating reaches YB / T 4003 standard C1.0 or B0.5
本发明的有益效果是：The beneficial effects of the present invention are:
(1)本发明中低钢级管线钢成品合金元素较少，合金化压力较小，将成品硫设定为0.002％～0.005％，其目的主要是得到高硫钢水，为生产高熔点的CaS-Al 2O 3类型固态夹杂物提供前提条件； (1) In the present invention, the finished low-grade pipeline steel has fewer alloy elements and a lower alloying pressure, and the finished sulfur is set to 0.002% to 0.005%. The main purpose is to obtain high-sulfur molten steel for the production of high melting point CaS -Al 2 O 3 type solid inclusions provide prerequisites;
(2)本发明中低真空度延长真空时间可以最大限度减少钢水中的气体含量，提高钢水的洁净度；(2) The low vacuum degree and extended vacuum time of the present invention can minimize the gas content in the molten steel and improve the cleanliness of the molten steel;
(3)本发明中RH真空结束后进行钙处理，此时钢水环境处于高硫低氧的环境，有利于形成CaS-Al 2O 3类型的固态夹杂物，钙处理后静搅，保证了钢水中的夹杂物能够充分上浮； (3) In the present invention, calcium treatment is performed after the RH vacuum is completed. At this time, the molten steel environment is in a high sulfur and low oxygen environment, which is beneficial to the formation of CaS-Al 2 O 3 type solid inclusions. Inclusions in the water can fully float up;
(4)本发明中CCM浇注过程过热度控制在30℃～35℃，高过热度有利于提高钢水在静搅、转运、浇注过程中动力学、热力学条件，保证得到的固态夹杂物充分上浮去除，有效提高钢水洁净度；(4) In the present invention, the superheat degree of the CCM casting process is controlled at 30 ℃ ~ 35 ℃, the high superheat degree is conducive to improving the kinetics and thermodynamic conditions of the molten steel in the process of static stirring, transfer, casting, and ensuring that the solid inclusions obtained are fully removed. , Effectively improve the cleanliness of molten steel;
(5)本发明中CCM浇注过程配合使用电磁搅拌技术，减少中心偏析，防止MnS夹杂的生成。(5) In the present invention, the CCM casting process is combined with the use of electromagnetic stirring technology to reduce center segregation and prevent the formation of MnS inclusions.
具体实施方式detailed description
本发明提供一种低钢级管线洁净钢，其化学成分及质量百分比如下：C:0.04％～0.07％，Si:0.10％～0.35％，Mn:1.00％～1.50％，P≤0.015％，S:0.0020％～0.0050％，Nb:0.030％～0.070％，Ti:0.006％～0.020％，Ni≤0.30％，Cr≤0.30％，Cu≤0.30％，Al:0.015％～0.050％，余量为Fe和杂质。The present invention provides a low-grade pipeline clean steel, the chemical composition and mass percentage are as follows: C: 0.04% ~ 0.07%, Si: 0.10% ~ 0.35%, Mn: 1.00% ~ 1.50%, P ≤ 0.015%, S : 0.0020% to 0.0050%, Nb: 0.030% to 0.070%, Ti: 0.006% to 0.020%, Ni ≤ 0.30%, Cr ≤ 0.30%, Cu ≤ 0.30%, Al: 0.015% to 0.050%, the balance is Fe And impurities.
冶炼工艺包括以下流程：The smelting process includes the following processes:
S1、脱硫站采用液态氧化钙与镁粉混合喷吹的方式进行脱硫，脱硫结束后进行深扒渣处理，脱硫站脱硫标准≤0.005％，转炉使用废钢，确保出钢硫达到≤0.010％，转炉出钢加铝块进行强脱氧，加入量为35kg/100ppm，为LF脱硫做好准备；S1. The desulfurization station uses liquid calcium oxide and magnesium powder to mix and spray for desulfurization. After the desulfurization, deep slag treatment is carried out. The desulfurization standard of the desulfurization station is ≤0.005%. The converter uses scrap steel to ensure that the sulfur in the steel is ≤0.010%. Add strong aluminum block for strong deoxidation, adding 35kg / 100ppm to prepare for LF desulfurization;
S2、LF主要负责脱硫及合金化，成品硫设定为0.002％～0.005％；S2 and LF are mainly responsible for desulfurization and alloying, and the finished sulfur is set to 0.002% ～ 0.005%;
S3、RH真空处理，真空度小于3MPa，纯真空时间18min以上，RH真空结束后喂入150m～200m无缝纯钙线进行钙处理，钙处理后进行12分钟静搅；S3, RH vacuum treatment, the vacuum degree is less than 3MPa, the pure vacuum time is more than 18min, after the RH vacuum is completed, 150m-200m seamless pure calcium wire is fed for calcium treatment, and the calcium treatment is followed by 12 minutes of static stirring;
S4、CCM浇注过程中过热度控制在30℃～35℃，配合使用电磁搅拌技术，确保低倍评级达到YB/T 4003标准C1.0或B0.5以内。S4, CCM during the casting process, the superheat is controlled at 30 ℃ ~ 35 ℃, combined with the use of electromagnetic stirring technology, to ensure that the low power rating reaches YB / T 4003 standard C1.0 or B0.5.
实施例1-5提供的一种低钢级管线洁净钢，其化学成分及质量百分比如表1所示，其冶炼过程具体工艺参数如表2所示。The low-grade pipeline clean steel provided in Examples 1-5, the chemical composition and mass percentage are shown in Table 1, and the specific process parameters of the smelting process are shown in Table 2.
表1：实施例冶炼化学成份(％)Table 1: Examples of smelting chemical composition (%)
 A C％C% Mn％Mn% P％P% S％S% Si％Si% Ni％Ni% Cr％Cr% Cu％Cu%
实施例1Example 1 0.0600.060 1.0111.011 0.0130.013 0.00410.0041 0.2810.281 0.0190.019 0.020.02 0.0190.019
实施例2Example 2 0.0410.041 1.1911.191 0.0120.012 0.00300.0030 0.1210.121 0.0110.011 0.030.03 0.0110.011
实施例3Example 3 0.0500.050 1.3111.311 0.0120.012 0.00310.0031 0.1810.181 0.0190.019 0.020.02 0.0110.011
实施例4Example 4 0.0460.046 1.2361.236 0.0110.011 0.00480.0048 0.3040.304 0.0190.019 0.030.03 0.0110.011
实施例5Example 5 0.0540.054 1.1201.120 0.0090.009 0.00210.0021 0.2280.228 0.0110.011 0.020.02 0.0110.011
 A Alt％Alt% Nb％Nb% Mo％Mo% V％V% Ti％Ti% Ca％Ca% Ceq％Ceq% Pcm％Pcm%
实施例1Example 1 0.0370.037 0.0380.038 0.0070.007 0.0010.001 0.0130.013 0.00190.0019 0.270.27 0.130.13
实施例2Example 2 0.0330.033 0.0660.066 0.0080.008 0.0010.001 0.0120.012 0.00160.0016 0.280.28 0.130.13
实施例3Example 3 0.0360.036 0.0600.060 0.0090.009 0.0010.001 0.0110.011 0.00180.0018 0.270.27 0.130.13
实施例4Example 4 0.0390.039 0.0530.053 0.0060.006 0.0010.001 0.0130.013 0.00190.0019 0.280.28 0.130.13
实施例5Example 5 0.0350.035 0.0330.033 0.0090.009 0.0010.001 0.0110.011 0.00160.0016 0.270.27 0.130.13
表2冶炼及夹杂物检测情况Table 2 Smelting and inclusion detection
Figure PCTCN2019093663-appb-000001
Figure PCTCN2019093663-appb-000001
本发明对夹杂物产生机理进行了详尽分析，通过特殊的成份设计结合钙处理技术得到稳定的CaS-Al 2O 3类型的固态夹杂物，通过合理的30～35度高过热度控制，保证夹杂物上浮去除，从而得到钢水纯净度更高的洁净钢水，有效提高了钢水质量，满足客户要求。工艺改进后有效改善了钢水洁净度，减少了大尺寸夹杂物的对钢板性能的危害，提高了制管后的焊接性能，经济效益显著 The invention analyzes the generation mechanism of inclusions in detail, and obtains stable CaS-Al 2 O 3 type solid inclusions through special composition design and calcium treatment technology. The reasonable 30-35 degree high superheat control ensures the inclusions The objects are lifted and removed to obtain clean molten steel with higher purity of molten steel, which effectively improves the quality of molten steel and meets customer requirements. After the process is improved, the cleanliness of the molten steel is effectively improved, the harm of the large-size inclusions on the performance of the steel plate is reduced, and the welding performance after pipe making is improved, and the economic benefit is remarkable
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims (7)

  1. 一种低钢级管线洁净钢，其特征在于，其化学成分及质量百分比如下：C:0.04％～0.07％，Si:0.10％～0.35％，Mn:1.00％～1.50％，P≤0.015％，S:0.0020％～0.0050％，Nb:0.030％～0.070％，Ti:0.006％～0.020％，Ni≤0.30％，Cr≤0.30％，Cu≤0.30％，Al:0.015％～0.050％，余量为Fe和杂质。A low-grade pipeline clean steel, characterized in that its chemical composition and mass percentage are as follows: C: 0.04% to 0.07%, Si: 0.10% to 0.35%, Mn: 1.00% to 1.50%, P ≤ 0.015%, S: 0.0020% to 0.0050%, Nb: 0.030% to 0.070%, Ti: 0.006% to 0.020%, Ni ≤ 0.30%, Cr ≤ 0.30%, Cu ≤ 0.30%, Al: 0.015% to 0.050%, the balance is Fe and impurities.
  2. 根据权利要求1所述的一种低钢级管线洁净钢，其特征在于，其化学成分及质量百分比如下：C:0.060％，Si:0.281％，Mn:1.011％，P:0.013％，S:0.0041％，Nb:0.038％，Ti:0.013％，Ni:0.019％，Cr:0.02％，Cu:0.019％，Alt:0.037％，Mo:0.007％，V:0.001％，Ca:0.0019％，Ceq:0.27％，Pcm:0.13％。The low-grade pipeline clean steel according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.060%, Si: 0.281%, Mn: 1.011%, P: 0.013%, S: 0.0041%, Nb: 0.038%, Ti: 0.013%, Ni: 0.019%, Cr: 0.02%, Cu: 0.019%, Alt: 0.037%, Mo: 0.007%, V: 0.001%, Ca: 0.0019%, Ceq: 0.27%, Pcm: 0.13%.
  3. 根据权利要求1所述的一种低钢级管线洁净钢，其特征在于，其化学成分及质量百分比如下：C:0.041％，Si:0.121％，Mn:1.191％，P:0.012％，S:0.0030％，Nb:0.066％，Ti:0.012％，Ni:0.011％，Cr:0.03％，Cu:0.011％，Alt:0.033％，Mo:0.008％，V:0.001％，Ca:0.0016％，Ceq:0.28％，Pcm:0.13％。The low-grade pipeline clean steel according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.041%, Si: 0.121%, Mn: 1.191%, P: 0.012%, S: 0.0030%, Nb: 0.066%, Ti: 0.012%, Ni: 0.011%, Cr: 0.03%, Cu: 0.011%, Alt: 0.033%, Mo: 0.008%, V: 0.001%, Ca: 0.0016%, Ceq: 0.28%, Pcm: 0.13%.
  4. 根据权利要求1所述的一种低钢级管线洁净钢，其特征在于，其化学成分及质量百分比如下：C:0.050％，Si:0.181％，Mn:1.311％，P:0.012％，S:0.0031％，Nb:0.066％，Ti:0.011％，Ni:0.019％，Cr:0.02％，Cu:0.011％，Alt:0.036％，Mo:0.009％，V:0.001％，Ca:0.0018％，Ceq:0.27％，Pcm:0.13％。The low-grade pipeline clean steel according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.050%, Si: 0.181%, Mn: 1.311%, P: 0.012%, S: 0.0031%, Nb: 0.066%, Ti: 0.011%, Ni: 0.019%, Cr: 0.02%, Cu: 0.011%, Alt: 0.036%, Mo: 0.009%, V: 0.001%, Ca: 0.0018%, Ceq: 0.27%, Pcm: 0.13%.
  5. 根据权利要求1所述的一种低钢级管线洁净钢，其特征在于，其化学成分及质量百分比如下：C:0.046％，Si:0.304％，Mn:1.236％，P:0.011％，S:0.0048％，Nb:0.053％，Ti:0.013％，Ni:0.019％，Cr:0.03％，Cu:0.011％，Alt:0.039％，Mo:0.006％，V:0.001％，Ca:0.0019％，Ceq:0.28％，Pcm:0.13％。The low-grade pipeline clean steel according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.046%, Si: 0.304%, Mn: 1.236%, P: 0.011%, S: 0.0048%, Nb: 0.053%, Ti: 0.013%, Ni: 0.019%, Cr: 0.03%, Cu: 0.011%, Alt: 0.039%, Mo: 0.006%, V: 0.001%, Ca: 0.0019%, Ceq: 0.28%, Pcm: 0.13%.
  6. 根据权利要求1所述的一种低钢级管线洁净钢，其特征在于，其化学成分及质量百分比如下：C:0.054％，Si:0.228％，Mn:1.120％，P:0.009％，S:0.0021％，Nb:0.033％，Ti:0.011％，Ni:0.011％，Cr:0.02％，Cu:0.011％，Alt:0.035％，Mo:0.009％，V:0.001％，Ca:0.0016％，Ceq:0.27％，Pcm:0.13％。The low-grade pipeline clean steel according to claim 1, characterized in that its chemical composition and mass percentage are as follows: C: 0.054%, Si: 0.228%, Mn: 1.120%, P: 0.009%, S: 0.0021%, Nb: 0.033%, Ti: 0.011%, Ni: 0.011%, Cr: 0.02%, Cu: 0.011%, Alt: 0.035%, Mo: 0.009%, V: 0.001%, Ca: 0.0016%, Ceq: 0.27%, Pcm: 0.13%.
  7. 一种低钢级管线洁净钢冶炼工艺，其特征在于，具体包括以下流程：A low-grade pipeline clean steel smelting process, characterized by specifically including the following process:
    S1、脱硫站采用液态氧化钙与镁粉混合喷吹的方式进行脱硫，脱硫结束后进行深扒渣处理，脱硫站脱硫标准≤0.005％，转炉使用废钢，确保出钢硫达到≤0.010％，转炉出钢加铝块进行强脱氧，加入量为35kg/100ppm，为LF脱硫做好准备；S1. The desulfurization station uses liquid calcium oxide and magnesium powder to mix and spray for desulfurization. After the desulfurization, deep slag treatment is carried out. The desulfurization standard of the desulfurization station is ≤0.005%. The converter uses scrap steel to ensure that the sulfur in the steel is ≤0.010%. Add strong aluminum block for strong deoxidation, adding 35kg / 100ppm to prepare for LF desulfurization;
    S2、LF主要负责脱硫及合金化，成品硫设定为0.002％～0.005％；S2 and LF are mainly responsible for desulfurization and alloying, and the finished sulfur is set to 0.002% ～ 0.005%;
    S3、RH真空处理，真空度小于3MPa，纯真空时间18min以上，RH真空结束后喂入150m～200m无缝纯钙线进行钙处理，钙处理后进行12分钟静搅；S3, RH vacuum treatment, the vacuum degree is less than 3MPa, the pure vacuum time is more than 18min, after the RH vacuum is completed, 150m-200m seamless pure calcium wire is fed for calcium treatment, and the calcium treatment is followed by 12 minutes of static stirring;
    S4、CCM浇注过程中过热度控制在30℃～35℃，配合使用电磁搅拌技术，确保低倍评级达到YB/T 4003标准C1.0或B0.5以内。S4, CCM during the casting process, the superheat is controlled at 30 ℃ ~ 35 ℃, combined with the use of electromagnetic stirring technology, to ensure that the low power rating reaches YB / T 4003 standard C1.0 or B0.5.
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