KR970073762A - Method of manufacturing slab of two phase stainless steel - Google Patents

Method of manufacturing slab of two phase stainless steel Download PDF

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Publication number
KR970073762A
KR970073762A KR1019960017214A KR19960017214A KR970073762A KR 970073762 A KR970073762 A KR 970073762A KR 1019960017214 A KR1019960017214 A KR 1019960017214A KR 19960017214 A KR19960017214 A KR 19960017214A KR 970073762 A KR970073762 A KR 970073762A
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South Korea
Prior art keywords
slab
nieq
creq
stainless steel
phase
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KR1019960017214A
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Korean (ko)
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KR100286643B1 (en
Inventor
이용헌
이용득
김봉운
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김종진
포항종합제철 주식회사
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Priority to KR1019960017214A priority Critical patent/KR100286643B1/en
Priority to US08/776,806 priority patent/US5733387A/en
Priority to PCT/KR1996/000084 priority patent/WO1996039543A2/en
Priority to JP9500320A priority patent/JP3041050B2/en
Priority to EP96917724A priority patent/EP0777756B2/en
Priority to CN96190623A priority patent/CN1070930C/en
Publication of KR970073762A publication Critical patent/KR970073762A/en
Application granted granted Critical
Publication of KR100286643B1 publication Critical patent/KR100286643B1/en

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    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C21D2211/001—Austenite
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

본 발명은 해수설비 등의 소재로 사용되는 폐라이트상과 오스테나이트상으로 이루어진 2상 스테인레스 강 제조용 슬라브를 제조하는 방법에 관한 것으로써, 본 발명은 슬라브 제조시 일정온도구간에서의 냉각속도를 적절히 제어하여 금속간 화합물의 석출을 최소화함으로써, 슬라브 표면 연마시 표면 결함발생을 방지하고자 하는데, 그 목적이 있는 것이다.The present invention relates to a method for producing a slab for the manufacture of two-phase stainless steel comprising a waste light phase and an austenite phase used as materials for seawater facilities and the like, To minimize the precipitation of intermetallic compounds, thereby preventing the occurrence of surface defects during polishing of the slab surface.

본 발명은 중량%로, C : 0.03% 이하, Si : 1.0%이하, Mn : 2.0%이하, P : 0.04이하, S : 0.이하, Cu : 2.0%이하, Ni : 5.0-8.0%이하, Cr : 22-27% MO : 1.0-2.0%, W : 2.0-5.0% 및 N : 0.13-0.27%를 포함하고 ; Nieq = %Ni+30×%C+0.5×%Mn+0.33×%Cu+30×(%N-0.045), Creq = %Cr+%Mo+1.5×%Si+0.73×%W 로 정의되는 니켈당량(Nieq)과 크롬 당량(Creq)의 비(Creq/Nieq)가 2.2-3.0이고 ; 텅스텐과 몰리브덴의 중량비(W/Mo)가 2.6-3.4인 조건을 만족하도록 조성되는 용강을 슬라브 형태로 연속주조한 후 슬라브를 냉각하여 페 라이트상과 오스테나이트상으로 이루어진 2상 스테인레스강 제조용 슬라브를 제조하는 방법에 있어서, 상기 연속주조 및 슬라브 냉각시 1000-800℃온도구간에서 650-700의 온도구간까지의 냉각속도를 3℃/min 이상으로 하여 2상 스테인레스강의 슬라브를 제조하는 방법을 그 요지로 한다.The steel sheet according to the present invention is characterized by containing, by weight%, C: not more than 0.03%, Si: not more than 1.0%, Mn: not more than 2.0%, P: not more than 0.04, S: not more than 0.20, Cu: not more than 2.0% Cr: 22-27% MO: 1.0-2.0%, W: 2.0-5.0% and N: 0.13-0.27%; Nieq =% Ni + 30x% C + 0.5x% Mn + 0.33x% Cu + 30x% N-0.045, Creq =% Cr +% Mo + 1.5x% Si + 0.73x% W (Creq / Nieq) of (Nieq) to chromium equivalent (Creq) is 2.2 to 3.0; Molten steel, which is prepared so as to satisfy the condition that the weight ratio (W / Mo) of tungsten and molybdenum is 2.6-3.4, is continuously cast in the form of a slab, and then the slab is cooled to obtain a slab for manufacturing a duplex stainless steel made of a ferrite phase and an austenite phase A method for producing a slab of a two-phase stainless steel at a cooling rate of 3 ° C / min or more in a temperature range of 650-700 at a temperature range of 1000-800 ° C during continuous casting and slab cooling, .

Description

2상 스테인레스강의 슬라브 제조방법.Method for manufacturing slabs of two phase stainless steel.

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

Claims (6)

중량%로, C : 0.03% 이하, Si : 1.0%이하, Mn : 2.0%이하, P : 0.04이하, S : 0.004%이하, Cu : 2.0%이하, Ni : 5.0-8.0%이하, Cr : 22-23% MO : 1.0-2.0%, W : 2.0-5.0% 및 N : 0.13-0.27%를 포함하고 ; Nieq = %Ni+30×%C+0.5×%Mn+0.33×%Cu+30×(%N-0.045), Creq = %Cr+%Mo+1.5×%Si+0.73×%W 로 정의되는 니켈당량(Nieq)과 크롬당량(Creq)의 비(Creq/Nieq)가 2.2-3.0이고 ; 텅스텐과 몰리브덴의 중량비(W/Mo)가 2.6-3.4인 조건을 만족하도록 조성되는 용강을 슬라브 형태로 연속주조한 후 슬라브를 냉각하여 페라이트상과 오스테나이트상으로 이루어진 2상 스테인레스강 제조용 슬라브를 제조하는 방법에 있어서, 상기 연속주조 및 슬라브 냉각시 950-800℃ 온도구간에서 650-700℃의 온도구간까지의 냉각속도가 3℃/min 이상인 것을 특징으로 하는 2상 스테인레스강의 슬라브 제조방법.Si: not more than 0.03%, Mn: not more than 0.04%, P: not more than 0.04%, S: not more than 0.004%, Cu: not more than 2.0%, Ni: not more than 5.0-8.0% -23% MO: 1.0-2.0%, W: 2.0-5.0% and N: 0.13-0.27%; Nieq =% Ni + 30x% C + 0.5x% Mn + 0.33x% Cu + 30x% N-0.045, Creq =% Cr +% Mo + 1.5x% Si + 0.73x% W (Creq / Nieq) of (Nieq) to chromium equivalent (Creq) is 2.2 to 3.0; Molten steel which is formed so as to satisfy the condition that the weight ratio (W / Mo) of tungsten and molybdenum is 2.6-3.4 is continuously cast in a slab form, and then the slab is cooled to manufacture a slab for the manufacture of a duplex stainless steel comprising a ferrite phase and an austenite phase Wherein the cooling rate of the continuous casting and slab cooling to a temperature range of 650-700 ° C at a temperature interval of 950-800 ° C is 3 ° C / min or more. 제 1항에 있어서, 용강이 중량%로 Ca : 0.03% 이하, Ce : 0.1% 이하, B : 0.005% 이하 및 Ti : 0.5% 이하로 이루어지는 그룹중에서 선택된 1종 또는 2종 이상을 추가로 함유하고 있는 것을 특징으로 하는 2상 스테인레스강의 슬라브 제조방법.The steel according to claim 1, wherein the molten steel further contains at least one selected from the group consisting of 0.03% or less of Ca, 0.1% or less of Ce, 0.005% or less of B, and 0.5% or less of Ti in weight percent Wherein the slab is formed of a stainless steel. 제 1항 또는 제 2항에 있어서, 상기 연속주조 및 슬라브 냉각시 950-700℃ 온도구간에서의 냉각속도가 3-60℃/min인 것을 특징으로 하는 2상 스테인레스강의 슬라브 제조방법.The method of claim 1 or 2, wherein the cooling rate in the temperature range of 950-700 ° C during the continuous casting and slab cooling is 3-60 ° C / min. 중량%로, C : 0.03% 이하, Si : 1.0%이하, Mn : 2.0%이하, P : 0.04이하, S : 0.004%이하, Cu : 2.0%이하, Ni : 5.0-8.0%이하, Cr : 22-27% MO : 1.0-2.0%, W : 2.0-5.0% 및 N : 0.13-0.27%를 포함하고 ; Nieq-%Ni+30×%C+0.5×%Mn+0.33×%Cu+30×(%N-0.045), Creq = %Cr+%Mo+1.5×%Si+0.73×%W 로 정의되는 니켈당량(Nieq)과 크롬당량(Creq)의 비(Creq/Nieq)가 2.2-3.0이고 ; 텅스텐과 몰리브덴의 중량비(W/Mo)가 2.6-3.4인 조건을 만족하도록 조성되는 용강을 슬라브 형태로 연속주조한 후 슬라브를 냉각하여 페라이트상과 오스테나이트상으로 이루어진 2상 스테인레스강 제조용 슬라브를 제조하는 방법에 있어서, 상기 연속주조 및 슬라브 냉각 시 1000-800℃의 온도구간에서 650-700℃의 온도구간까지의 냉각 속도가 5℃/min 이상인 것을 특징으로 하는 2상 스테인레스강의 슬라브 제조방법.Si: not more than 0.03%, Mn: not more than 0.04%, P: not more than 0.04%, S: not more than 0.004%, Cu: not more than 2.0%, Ni: not more than 5.0-8.0% -27% MO: 1.0-2.0%, W: 2.0-5.0% and N: 0.13-0.27%; Nieq-% Ni + 30 x% C + 0.5 x Mn + 0.33 x% Cu + 30 x% N-0.045, Creq =% Cr +% Mo + 1.5 x Si + 0.73 x% (Creq / Nieq) of (Nieq) to chromium equivalent (Creq) is 2.2 to 3.0; Molten steel which is formed so as to satisfy the condition that the weight ratio (W / Mo) of tungsten and molybdenum is 2.6-3.4 is continuously cast in a slab form, and then the slab is cooled to manufacture a slab for the manufacture of a duplex stainless steel comprising a ferrite phase and an austenite phase Wherein the cooling rate of the continuous casting and slab cooling to a temperature range of 650-700 占 폚 at a temperature range of 1000-800 占 폚 is 5 占 폚 / min or more. 제 4항에 있어서, 용강이, 중량%로 Ca : 0.03% 이하, Ce : 0.1% 이하, B : 0.005% 이하 및 Ti : 0.5% 이하로 이루어지는 그룹 중에서 선택된 1종 또는 2종 이상을 추가로 함유하고 있는 것을 특징으로 하는 2상 스테인레스강의 슬라브 제조방법.The steel according to claim 4, wherein the molten steel further contains one or more selected from the group consisting of 0.03% or less of Ca, 0.1% or less of Ce, 0.005% or less of B, and 0.5% or less of Ti in weight% Wherein the slab is made of stainless steel. 제 4항 또는 제 5항에 있어서, 상기 연속주조 및 슬라브 냉각시 1000-700℃ 온도구간에서의 냉각 속도가 5-180℃/min 인 것을 특징으로 하는 2상 스테인레스강의 슬라브 제조방법.The method according to claim 4 or 5, wherein the cooling rate in the temperature range of 1000-700 ° C during the continuous casting and slab cooling is 5-180 ° C / min. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960017214A 1995-06-05 1996-05-21 Method for manufacturing dual phase stainless steel slab KR100286643B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1019960017214A KR100286643B1 (en) 1996-05-21 1996-05-21 Method for manufacturing dual phase stainless steel slab
US08/776,806 US5733387A (en) 1995-06-05 1996-06-05 Duplex stainless steel, and its manufacturing method
PCT/KR1996/000084 WO1996039543A2 (en) 1995-06-05 1996-06-05 Duplex stainless steel, and its manufacturing method
JP9500320A JP3041050B2 (en) 1995-06-05 1996-06-05 Duplex stainless steel and its manufacturing method
EP96917724A EP0777756B2 (en) 1995-06-05 1996-06-05 Method for manufacturing duplex stainless steel
CN96190623A CN1070930C (en) 1995-06-05 1996-06-05 Duplex stainless steel, and its manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960017214A KR100286643B1 (en) 1996-05-21 1996-05-21 Method for manufacturing dual phase stainless steel slab

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KR970073762A true KR970073762A (en) 1997-12-10
KR100286643B1 KR100286643B1 (en) 2001-04-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100605678B1 (en) * 1999-11-08 2006-07-31 주식회사 포스코 A heat resistant stainless steel having good heat resistant strength

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101239560B1 (en) 2010-12-28 2013-03-05 주식회사 포스코 Duplex stainless steel and method for manufacturing the same with good surface quality
KR101239517B1 (en) 2010-12-28 2013-03-05 주식회사 포스코 Duplex stainless steel and method for manufacturing the same with good surface quality
KR101697091B1 (en) * 2015-11-30 2017-01-18 주식회사 포스코 Ferritic stainless steel sheet with improved surface quality and method of manufacturing the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63216924A (en) * 1987-03-03 1988-09-09 Nippon Steel Corp Manufacture of cr-ni stainless steel having high resistance to rust formation and excellent in polishability

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100605678B1 (en) * 1999-11-08 2006-07-31 주식회사 포스코 A heat resistant stainless steel having good heat resistant strength

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