KR970033258A - How to prevent pinholes in titanium cast stainless steel castings - Google Patents

How to prevent pinholes in titanium cast stainless steel castings Download PDF

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Publication number
KR970033258A
KR970033258A KR1019950053572A KR19950053572A KR970033258A KR 970033258 A KR970033258 A KR 970033258A KR 1019950053572 A KR1019950053572 A KR 1019950053572A KR 19950053572 A KR19950053572 A KR 19950053572A KR 970033258 A KR970033258 A KR 970033258A
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South Korea
Prior art keywords
mold powder
stainless steel
equilibrium
oxide
iron oxide
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KR1019950053572A
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Korean (ko)
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KR100244634B1 (en
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김종완
김선구
이은석
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김종진
포항종합제철주식회사
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Priority to KR1019950053572A priority Critical patent/KR100244634B1/en
Publication of KR970033258A publication Critical patent/KR970033258A/en
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Publication of KR100244634B1 publication Critical patent/KR100244634B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/002—Stainless steels
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Continuous Casting (AREA)

Abstract

본 발명은 Ti 첨가 스테인레스강 연주주편의 핀홀(pin hole)발생방지 방법에 관한 것이며, 그 목적은 강성분 조절 및 온도 조절없이도 용이하게 Ti첨가 스테인레스 강주편에서 발생되는 핀홀발생을 저감함에 있다.The present invention relates to a method for preventing pin hole generation of Ti-containing stainless steel cast pieces, and an object thereof is to reduce pin hole generation easily generated in a Ti-added stainless steel cast without controlling steel components and temperature.

본 발명은 몰드파우더를 투입하면서 Ti 첨가 스테인레스강을 연속주조하는 방법에 있어서, 상기 몰드 파우더의 염기도 (CaO/SiO2)를 0.9-1.0으로 조절하는 단계; 몰드 파우더내의 산화철(FeO)과 용강중의 TiN 사이의 평형반응으로부터 열역학적 평형정수(K)를 구하는 단계; 상기 몰드 파우더내에 함유된 산화철의 실제 농도를 분석하는 단계; 분석된 몰드 파우더내의 산화철의 함량에 대응하는 Ti 산화물 (Ti2O3)의 평형농도를 상기 평형정수를 이용하여 구하는 단계; 및 몰드 파우더내에 Ti 산화물의 그 평형농도 이상으로 첨가하는 단계를 포함하여 구성되는 Ti 첨가 스테인레스강 연주주편의 핀홀 발생방지방법에 관한 것을 그 기술적 요지로 한다.The present invention provides a method for continuously casting a Ti-added stainless steel while injecting a mold powder, the method comprising: adjusting the basicity (CaO / SiO 2 ) of the mold powder to 0.9-1.0; Obtaining a thermodynamic equilibrium constant (K) from an equilibrium reaction between iron oxide (FeO) in the mold powder and TiN in molten steel; Analyzing the actual concentration of iron oxide contained in the mold powder; Obtaining an equilibrium concentration of Ti oxide (Ti 2 O 3 ) corresponding to the content of iron oxide in the analyzed mold powder using the equilibrium constant; And a method for preventing pinhole generation of a Ti-added stainless steel casting cast comprising the step of adding the TiO oxide in an amount equal to or greater than the equilibrium concentration of the Ti oxide.

Description

티타늄 첨가 스테인레스강 연주주편의 핀홀 발생 방지방법How to prevent pinholes in titanium cast stainless steel castings

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 티타늄(Ti) 첨가 스테인레스강의 연속주조시 연주주편의 핀홀 발생기구를 나타내는 모식도.1 is a schematic diagram showing the pinhole generating mechanism of the cast steel during continuous casting of titanium (Ti) -added stainless steel.

제2도는 열역학 평형계산을 통한 핀홀 발생방지를 위한 몰드 슬래그중의 FeO와 Ti2O3농도의 관계를 나타내는 그래프.2 is a graph showing the relationship between the concentration of FeO and Ti 2 O 3 in the mold slag for preventing pinhole generation through thermodynamic equilibrium calculation.

제3도는 CaO-SiO2-TiO2상태도와 고융점의 CaO-T2정출영역을 나타내는 그래프.3 is a graph showing CaO-SiO 2 -TiO 2 state and CaO-T 2 crystallization region of high melting point.

제4도는 TiN과 몰드슬래그와의 반응에 의한 질소가스 형성을 조사하는 실험장치를 도시적으로 나타내는 그래프.4 is a graph showing an experimental apparatus for investigating nitrogen gas formation by reaction between TiN and mold slag.

Claims (1)

몰드파우더를 투입하면서 Ti 첨가 스테인레스강을 연속주조하는 방법에 있어서, 상기 몰드 파우더의 염기도 (CaO/SiO2)를 0.9-1.0으로 조절하는 단계; 몰드 파우더내의 산화철(FeO)과 용강중의 TiN 사이의 평형반응으로부터 열역학적 평형정수(K)를 구하는 단계; 상기 몰드 파우더내에 함유된 산화철의 실제 농도를 분석하는 단계; 분석된 몰드 파우더내의 산화철의 함량에 대응하는 Ti 산화물 (Ti2O3)의 평형농도를 상기 평형정수를 이용하여 구하는 단계 및 몰드 파우더내에 Ti 산화물의 그 평형농도 이상으로 첨가하는 단계를 포함하여 구성됨을 특징으로 하는 Ti 첨가 스테인레스강 연주주편의 핀홀 발생방지 방법.A method of continuously casting Ti-added stainless steel while injecting a mold powder, the method comprising: adjusting the basicity (CaO / SiO 2 ) of the mold powder to 0.9-1.0; Obtaining a thermodynamic equilibrium constant (K) from an equilibrium reaction between iron oxide (FeO) in the mold powder and TiN in molten steel; Analyzing the actual concentration of iron oxide contained in the mold powder; Calculating the equilibrium concentration of Ti oxide (Ti 2 O 3 ) corresponding to the content of iron oxide in the analyzed mold powder using the equilibrium constant and adding the equilibrium concentration of Ti oxide above the equilibrium concentration or more. Pinhole generation prevention method of the titanium-containing stainless steel cast steel characterized in that ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950053572A 1995-12-21 1995-12-21 Prevention method fof pin hole of continuous casting KR100244634B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950053572A KR100244634B1 (en) 1995-12-21 1995-12-21 Prevention method fof pin hole of continuous casting

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Application Number Priority Date Filing Date Title
KR1019950053572A KR100244634B1 (en) 1995-12-21 1995-12-21 Prevention method fof pin hole of continuous casting

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KR970033258A true KR970033258A (en) 1997-07-22
KR100244634B1 KR100244634B1 (en) 2000-03-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101461574B1 (en) * 2012-11-30 2014-11-20 주식회사 포스코 Feeding apparatus for mold flux and the continuous casting method using it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101461574B1 (en) * 2012-11-30 2014-11-20 주식회사 포스코 Feeding apparatus for mold flux and the continuous casting method using it

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