EP4249622A1 - Ferritischer edelstahl mit verbesserter festigkeit, bearbeitbarkeit und korrosionsbeständigkeit - Google Patents

Ferritischer edelstahl mit verbesserter festigkeit, bearbeitbarkeit und korrosionsbeständigkeit Download PDF

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Publication number
EP4249622A1
EP4249622A1 EP21894831.3A EP21894831A EP4249622A1 EP 4249622 A1 EP4249622 A1 EP 4249622A1 EP 21894831 A EP21894831 A EP 21894831A EP 4249622 A1 EP4249622 A1 EP 4249622A1
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EP
European Patent Office
Prior art keywords
formula
stainless steel
corrosion resistance
ferritic stainless
content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21894831.3A
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English (en)
French (fr)
Inventor
Jieon PARK
Jong-Su Paek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP4249622A1 publication Critical patent/EP4249622A1/de
Pending legal-status Critical Current

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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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

Definitions

  • the present disclosure relates to a ferritic stainless steel with improved strength, workability, and corrosion resistance.
  • Ferritic stainless steels have been applied in various industrial fields, such as washing machines, refrigerators, and all kinds of electric home appliances due to fine surface quality and lower manufacturing costs compared to austenitic stainless steels.
  • the need for ferritic stainless steels with improved corrosion resistance and strength is increasing.
  • cost reduction has been required, and thus there is a need to develop a steel material to satisfy these requirements.
  • STS 430 steel type as an existing high-strength ferritic stainless steel, has high strength, corrosion resistance is low due to the high contents of C and N and lack of stabilizing elements such as Ti and Nb.
  • attempts have been made to improve corrosion resistance by lowering the contents of C and N and adding Ti or Nb manufacturing costs may increase in the case of adding the high-priced Nb and strength may decrease in the case of adding Ti despite no risk of increasing manufacturing costs, and therefore it is difficult to satisfy strength requirements. Therefore, there is a need to develop a ferritic stainless steel having improved corrosion resistance, strength, and workability with low manufacturing costs.
  • Patent Document 0001 Korean Patent Laid-open Publication No. 10-2010-0075190 (Published on July 2, 2010 )
  • ferritic stainless steel having improved strength, workability, and corrosion resistance with low manufacturing costs.
  • a ferritic stainless steel according to an embodiment of the present disclosure includes, in percent by weight, 0.0005 to 0.02% of C, 0.005 to 0.02% of N, 0.7 to 1.0% of Si, 16.0 to 17.0% of Cr, 0.05 to 0.3% of Ti, and the balance being Fe and inevitable impurities, wherein a value of Formula (1) below satisfies 21 to25, a tensile strength is 470 MPa or more, and an elongation is 27% or more. 7 * Si + Cr
  • Si and Cr represent the contents (wt%) of the respective elements.
  • a value of Formula (2) below may satisfy 20 or more and a pitting potential may be 150 mV or more.
  • a ferritic stainless steel having improves strength, workability, and corrosion resistance with low manufacturing costs may be provided by designing an alloy composition.
  • the manufacturing costs may be reduced by increasing the Si content and the Cr content.
  • a ferritic stainless steel according to an embodiment has a tensile strength of 470 MPa or more and an elongation of 27% or more.
  • corrosion resistance may be improved by using a new composition parameter to adjust the contents of Si, Cr, Ti, C, and N.
  • a ferritic stainless steel according to an embodiment may have a pitting potential of 150 mV or more.
  • a ferritic stainless steel according to an embodiment of the present disclosure may have a tensile strength of 470 MPa or more, an elongation of 27% or more, and a pitting potential of 150 mV or more.
  • a ferritic stainless steel includes, in percent by weight (wt%), 0.0005 to 0.02% of C, 0.005 to 0.02% of N, 0.7 to 1.0% of Si, 16.0 to 17.0% of Cr, 0.05 to 0.3% of Ti, and the balance being Fe and inevitable impurities, wherein a value of Formula (1) below satisfying 21 to25, a tensile strength is 470 MPa or more, and an elongation is 27% or more. 7 * Si + Cr
  • Si and Cr represent the contents (wt%) of the respective elements.
  • STS 430 steel type that has been conventionally used as high-strength ferritic stainless steel for home appliances has problems of low corrosion resistance and an increase in manufacturing costs in the case of adding Nb to improve the corrosion resistance and also has a problem of a decrease in strength in the case of adding Ti.
  • the present inventors have deeply studied methods for improving strength and corrosion resistance while reducing manufacturing costs. As a result, it was confirmed that the above-mentioned problems could be solved by adjusting the contents of alloying elements Si, Cr, Ti, C, and N using an expression of the relation therebetween based on the chemical composition of a ferritic stainless steel containing Ti, thereby completing the present disclosure.
  • a ferritic stainless steel according to an embodiment of the present disclosure may include, in percent by weight (wt%), 0.0005 to 0.02% of C, 0.005 to 0.02% of N, 0.7 to 1.0% of Si, 16.0 to 17.0% of Cr, 0.05 to 0.3% of Ti, and the balance being Fe and inevitable impurities.
  • the content of C may be from 0.0005 to 0.02 wt%.
  • the C content When the C content is less than 0.0005 wt%, refining costs for obtaining high-purity products increase. When the C content exceeds 0.02 wt%, the content of impurities increases, resulting in deterioration of elongation and corrosion resistance. In order to improve elongation and corrosion resistance, the C content may be 0.01 wt% or less.
  • the content of N may be from 0.005 to 0.02 wt%.
  • the N content When the N content is less than 0.005 wt%, an equiaxed crystal ratio of a slab decreases due to reduced TiN crystallization. When the N content exceeds 0.02 wt%, the content of impurities increase, resulting in deterioration of elongation and corrosion resistance. In order to improve elongation and corrosion resistance, the N content may be 0.015 wt% or less.
  • the content of Si may be from 0.7 to 1.0 wt%.
  • conventional STS 430 steel type has a low Si content of 0.3 to 0.6 wt%
  • the Si content is increased to a range of 0.7 to 1.0 wt% in the present disclosure to obtain strength and corrosion resistance.
  • the Si content is less than 0.7 wt%, the amount of solute Si is insufficient to deteriorate tensile strength and corrosion resistance.
  • the Si content exceeds 1.0 wt%, the strength of a material excessively increases to cause a problem of deterioration in elongation.
  • the Si content may be controlled to a range of 0.8 to 1.0 wt%. In this case, a target content of Si may be 0.9 wt%.
  • a stainless steel according to the present disclosure has improved corrosion resistance compared to conventional STS 430 steel type by increasing the Si content.
  • a pitting potential of the STS 430 steel type is 145 mV or less
  • the ferritic stainless steel according to the present disclosure has a pitting potential of 150 mV or more and may also have a pitting potential of 160 mV or more.
  • the content of Cr may be from 16.0 to 17.0 wt%.
  • a preferable Cr content may be from 16.0 to 16.5 wt%. More preferably, the Cr content may be from 16.1 to 16.3 wt%.
  • the Ti content may be from 0.05 to 0.3 wt%.
  • the Ti content for the purpose of improving corrosion resistance may be from 0.18 to 0.25 wt%.
  • the remaining component of the composition of the present disclosure is iron (Fe).
  • the composition may include unintended impurities inevitably incorporated from raw materials or surrounding environments, and thus addition of other alloying elements is not excluded.
  • the impurities are not specifically mentioned in the present disclosure, as they are known to any person skilled in the art of manufacturing.
  • Si and Cr are elements closely related to corrosion resistance, strength, and workability of a ferritic stainless steel.
  • Si and Cr are elements that strengthen a passivated layer of a ferritic stainless steel to improve corrosion resistance and also are incorporated into a matrix structure to improve strength.
  • Si and Cr are elements deteriorating workability, it is necessary to derive optimal components by identifying the relationship between each of the elements and the material.
  • the present inventors have studied the relationship among the alloying elements in the above-described alloy composition to improve tensile strength and elongation and found that a tensile strength of 470 MPa or more and an elongation of 27% or more may be obtained in the case where a value of Formula (1) below satisfies a range of 21 to 25. 7 * Si + Cr
  • Si and Cr represent the contents (wt%) of the respective elements.
  • the present inventors have studied the relationship between the contents of Ti, C, and N, as well as the contents of Si and Cr, and corrosion resistance to improve corrosion resistance. Since C forms a Cr carbide at grain boundaries of a region thermally affected by heat treatment, and Cr concentration reduction and Cr depletion occurring around the Cr carbide may cause grain boundary corrosion. Because Ti fixes C and N to form a Ti(C,N) carbonitride that is stabler than the Cr carbide, Cr precipitation may be inhibited, thereby improving corrosion resistance.
  • the present inventors have studied the relationship among the alloying elements in the above-described the alloy composition to improve corrosion resistance and found that a pitting potential of 150 mV or more may be obtained in the case where a value of Formula (2) below satisfies 20 or more.
  • a pitting potential of 150 mV or more may be obtained in the case where a value of Formula (2) below satisfies 20 or more.
  • values of Formulae (1) and (2) are values obtained by substituting the compositions of Table 1 into Formulae (1) and (2).
  • Samples of the prepared cold-rolled products were processed according to the JIS13B standards at a right angle (90°) to a rolling direction and tensile strength (MPa) and elongation (%) of the samples were measured, and pitting potential (E pit , mV) thereof was measured in a 3.5% NaCl solution at room temperature after polishing the surfaces of the samples with a #600 paper.
  • the measurement results are shown in Table 2 below.
  • the inventive examples had tensile strengths of 470 MPa or more since the chemical composition defined in the present disclosure was satisfied and the values of Formula (1) were 21 or more. Elongations of 27% or more were obtained since the values of Formula (1) were 25 or less. In addition, pitting potentials of 150 or more were obtained since the values of Formula (2) were 20 or more. Also, when the value of Formula (1) was in the range of 21 to 25 and the value of Formula (2) was 20 or more, all of the tensile strength of 470 MPa or more, the elongation of 27% or more, and the pitting potential of 150 mV or more were satisfied.
  • the Cr content was below the lower limit of 16.0 wt% defined in the present disclosure, and the value of Formula (1) was below 21, and the value of Formula (2) was below 20.
  • the tensile strength was below 470 MPa and the pitting potential was below 150 mV.
  • the Si content was greater than the upper limit of 1.0 defined in the present disclosure and the values of Formula (1) exceeded 25.
  • the tensile strengths were greater than 470 MPa, the elongations were less than 27%.
  • the Ti content was below the lower limit of 0.05 wt% defined in the present disclosure and the value of Formula (2) was below 20.
  • the tensile strength was greater than 470 MPa and the elongation was greater than 27%, the pitting potential was below 150 mV.
  • FIGS. 1 , 2 , and 3 provided herein are graphs visualizing the above-described results.
  • FIG. 1 is a graph illustrating tensile strengths of embodiments with respect to values of Formula (1). Referring to FIG. 1 , when the value of Formula (1) is 21 or more, a tensile strength of 470 MPa or more may be obtained. However, referring to FIG. 2 , Steel Types D and E according to the comparative example having tensile strengths of 470 or more due to the value of Formula (1) of 21 or more had elongations below 27T because the value of Formula (1) exceeded 25.
  • FIG. 3 is a graph illustrating pitting potentials of the embodiments with respect to the values of Formula (2). Referring to FIG. 3 , it may be confirmed that a pitting potential of 150 mV or more may be obtained when the value of Formula (2) is 20 or more.
  • a ferritic stainless steel having reduced manufacturing costs may be provided by adjusting the contents of Si and Cr. Also, according to an embodiment of the present disclosure, a ferritic stainless steel having improved strength, workability, and corrosion resistance may be obtained by composition-related parameters. Therefore, the ferritic stainless steel may be applied to various industrial fields.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Secondary Cells (AREA)
EP21894831.3A 2020-11-19 2021-08-26 Ferritischer edelstahl mit verbesserter festigkeit, bearbeitbarkeit und korrosionsbeständigkeit Pending EP4249622A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020200155838A KR102424980B1 (ko) 2020-11-19 2020-11-19 강도, 가공성 및 내식성이 향상된 페라이트계 스테인리스강
PCT/KR2021/011466 WO2022108058A1 (ko) 2020-11-19 2021-08-26 강도, 가공성 및 내식성이 향상된 페라이트계 스테인리스강

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EP4249622A1 true EP4249622A1 (de) 2023-09-27

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EP21894831.3A Pending EP4249622A1 (de) 2020-11-19 2021-08-26 Ferritischer edelstahl mit verbesserter festigkeit, bearbeitbarkeit und korrosionsbeständigkeit

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US (1) US20230416885A1 (de)
EP (1) EP4249622A1 (de)
JP (1) JP2023550410A (de)
KR (1) KR102424980B1 (de)
CN (1) CN116490628A (de)
WO (1) WO2022108058A1 (de)

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Publication number Priority date Publication date Assignee Title
JPH08176750A (ja) * 1994-12-28 1996-07-09 Nippon Steel Corp ベローズ加工用フェライト系ステンレス鋼
JP4428550B2 (ja) * 2001-03-21 2010-03-10 日新製鋼株式会社 耐リジング性および深絞り性に優れたフェライト系ステンレス鋼板およびその製造方法
KR100963109B1 (ko) * 2007-11-22 2010-06-14 주식회사 포스코 고크롬 페라이트계 스테인리스강
KR101086326B1 (ko) 2008-12-24 2011-11-24 주식회사 포스코 표면 품질이 우수한 페라이트계 스테인레스 강판의 제조방법
CN104250708B (zh) * 2013-06-25 2018-03-23 宝钢不锈钢有限公司 一种食品接触用铁素体不锈钢及其制备方法
KR102047401B1 (ko) * 2015-12-21 2019-11-25 주식회사 포스코 내공식성 및 내응축수 부식성이 개선된 자동차 배기계용 페라이트계 스테인리스강 및 이의 제조 방법
KR102020511B1 (ko) * 2017-12-14 2019-09-10 주식회사 포스코 충격 인성이 우수한 페라이트계 스테인리스강 및 그 제조방법

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CN116490628A (zh) 2023-07-25
KR20220068743A (ko) 2022-05-26
KR102424980B1 (ko) 2022-07-25
JP2023550410A (ja) 2023-12-01
US20230416885A1 (en) 2023-12-28
WO2022108058A1 (ko) 2022-05-27

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