JPS54155114A - Surface cracking prevention method for nb and v-containing steel ingot - Google Patents

Surface cracking prevention method for nb and v-containing steel ingot

Info

Publication number
JPS54155114A
JPS54155114A JP6411078A JP6411078A JPS54155114A JP S54155114 A JPS54155114 A JP S54155114A JP 6411078 A JP6411078 A JP 6411078A JP 6411078 A JP6411078 A JP 6411078A JP S54155114 A JPS54155114 A JP S54155114A
Authority
JP
Japan
Prior art keywords
continuous
ingot
contg
steel
cast
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
JP6411078A
Other languages
Japanese (ja)
Inventor
Hiroo Suzuki
Shinichi Iguchi
Shigehiro Yamaguchi
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP6411078A priority Critical patent/JPS54155114A/en
Publication of JPS54155114A publication Critical patent/JPS54155114A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C21C5/005—Manufacture of stainless steel

Landscapes

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

Abstract

PURPOSE:To reduce the surface cracking sensibility of a continuous-cast ingot and to prevent the ingot yield from lowering, in continuous casting of Nb and V-contg. steel, by controlling the N content of the molten steel to below 0.005%. CONSTITUTION:The N content of Nb and V-contg. steel contg. 0.02-0.20% of Nb and/or V is regulated to below 0.005% by minimizing N pickup in refining or by degassing. Thus, dissolved N precipitatable at 1000-750 deg.C is controlled to a very slight amt. When this molten steel is continuous-cast, precipitation of Nb(CN) and V(CN) on the austenite grain boundaries is controlled in the below 10 mm thick surface layer of the resulting ingot. At the same time, precipitation of film-like proeutectoid ferrite on the austenite grain boundaries is prevented in gamma-alpha transformation in the temp. range of the Ar3 transformation point +150 deg.C-the Ar3 - 100 deg.C, a continuous-cast ingot with no surface crack is obtd., and an yield lowering due to surface cracks is minimized.
JP6411078A 1978-05-29 1978-05-29 Surface cracking prevention method for nb and v-containing steel ingot Pending JPS54155114A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6411078A JPS54155114A (en) 1978-05-29 1978-05-29 Surface cracking prevention method for nb and v-containing steel ingot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6411078A JPS54155114A (en) 1978-05-29 1978-05-29 Surface cracking prevention method for nb and v-containing steel ingot

Publications (1)

Publication Number Publication Date
JPS54155114A true JPS54155114A (en) 1979-12-06

Family

ID=13248597

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6411078A Pending JPS54155114A (en) 1978-05-29 1978-05-29 Surface cracking prevention method for nb and v-containing steel ingot

Country Status (1)

Country Link
JP (1) JPS54155114A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5696013A (en) * 1979-12-29 1981-08-03 Sumitomo Metal Ind Ltd Production of carbonitride dispersed steel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51104425A (en) * 1975-03-12 1976-09-16 Nippon Steel Corp RENZOKUCHUZONYORUKAKOSEI OYOBI HYOMENSEI JONOSUGURETAUSUKOHAN
JPS51119613A (en) * 1975-04-14 1976-10-20 Nippon Steel Corp A process for producing a cold rolled steel plate by continuous castin g and annealing
JPS5219111A (en) * 1975-08-05 1977-02-14 Sumitomo Metal Ind Ltd Heat treated high tensile steel plate cont. b
JPS52111817A (en) * 1976-03-17 1977-09-19 Sumitomo Metal Ind Ltd Thermal strain brittleness resisting low alloy steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51104425A (en) * 1975-03-12 1976-09-16 Nippon Steel Corp RENZOKUCHUZONYORUKAKOSEI OYOBI HYOMENSEI JONOSUGURETAUSUKOHAN
JPS51119613A (en) * 1975-04-14 1976-10-20 Nippon Steel Corp A process for producing a cold rolled steel plate by continuous castin g and annealing
JPS5219111A (en) * 1975-08-05 1977-02-14 Sumitomo Metal Ind Ltd Heat treated high tensile steel plate cont. b
JPS52111817A (en) * 1976-03-17 1977-09-19 Sumitomo Metal Ind Ltd Thermal strain brittleness resisting low alloy steel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5696013A (en) * 1979-12-29 1981-08-03 Sumitomo Metal Ind Ltd Production of carbonitride dispersed steel
JPS5725606B2 (en) * 1979-12-29 1982-05-31

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