JPS55109503A - Direct rolling method for hot cast billet - Google Patents

Direct rolling method for hot cast billet

Info

Publication number
JPS55109503A
JPS55109503A JP1606379A JP1606379A JPS55109503A JP S55109503 A JPS55109503 A JP S55109503A JP 1606379 A JP1606379 A JP 1606379A JP 1606379 A JP1606379 A JP 1606379A JP S55109503 A JPS55109503 A JP S55109503A
Authority
JP
Japan
Prior art keywords
embrittlement
release
hot
cast billet
billet
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.)
Granted
Application number
JP1606379A
Other languages
Japanese (ja)
Other versions
JPS5910846B2 (en
Inventor
Takeshi Fujimoto
Kunio Watanabe
Susumu Aida
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 JP1606379A priority Critical patent/JPS5910846B2/en
Publication of JPS55109503A publication Critical patent/JPS55109503A/en
Publication of JPS5910846B2 publication Critical patent/JPS5910846B2/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working

Abstract

PURPOSE:To carry out the stable operation always freely from generation of surface cracks, by rolling just cast hot billet, without reheating, at temperatures lower than the embrittlement release temperature corresponding to various surface cooling speeds, previously obtained for every different grade of steel. CONSTITUTION:The cooling curves 8, 9, 10, starting at the solidification point 11, and the embrittlement release curve 12 obtained by connecting the border points at which the embrittlement is released, that is, the embrittlement release points 11a- 11c, are previously prepared by directly rolling the hot cast billet of the specified grade of steel, like as the illustrated diagram. Next, the hot cast billet, without being reheated, is directly rolled at temperatures lower than above curve 12. That is, if the hot cast billet is cooled to above embrittlement release zone, the restriction on the chemical composition is greatly relaxed. For example, in case of the carbon steel (C<=0.1%) of oxygen content 200ppm or less and Mn/S ratio 7 or more, the surface crack owing to the low melting point non-metallic inclusion, and the austenitic intercrystalline cracks owing to the solid-solution type sulfide to be caused at 1200 deg.C or lower temperatures, can be prevented.
JP1606379A 1979-02-16 1979-02-16 High temperature slab direct rolling method Expired JPS5910846B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1606379A JPS5910846B2 (en) 1979-02-16 1979-02-16 High temperature slab direct rolling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1606379A JPS5910846B2 (en) 1979-02-16 1979-02-16 High temperature slab direct rolling method

Publications (2)

Publication Number Publication Date
JPS55109503A true JPS55109503A (en) 1980-08-23
JPS5910846B2 JPS5910846B2 (en) 1984-03-12

Family

ID=11906109

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1606379A Expired JPS5910846B2 (en) 1979-02-16 1979-02-16 High temperature slab direct rolling method

Country Status (1)

Country Link
JP (1) JPS5910846B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57177864A (en) * 1981-04-24 1982-11-01 Daido Steel Co Ltd Production of case hardening steel
JPS6117301A (en) * 1984-07-02 1986-01-25 Sumitomo Metal Ind Ltd Prevention of surface cracking of billet during hot rolling
JPS61226151A (en) * 1985-03-29 1986-10-08 Nichidoku Jukogyo Kk Continuous casting method for metal and particularly steel
US4809765A (en) * 1984-12-28 1989-03-07 Nippon Steel Corporation Method for controlling solidification segregation of steel
KR20010054878A (en) * 1999-12-08 2001-07-02 이구택 Method for continuously casting to prevent the edge crack default
CN113176292A (en) * 2021-03-23 2021-07-27 中冶南方连铸技术工程有限责任公司 Judgment method for grain boundary embrittlement of casting blank

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62244456A (en) * 1986-04-17 1987-10-24 バブコツク日立株式会社 Mill device for manufacturing solid fuel slurry

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57177864A (en) * 1981-04-24 1982-11-01 Daido Steel Co Ltd Production of case hardening steel
JPS636307B2 (en) * 1981-04-24 1988-02-09 Daido Steel Co Ltd
JPS6117301A (en) * 1984-07-02 1986-01-25 Sumitomo Metal Ind Ltd Prevention of surface cracking of billet during hot rolling
US4809765A (en) * 1984-12-28 1989-03-07 Nippon Steel Corporation Method for controlling solidification segregation of steel
JPS61226151A (en) * 1985-03-29 1986-10-08 Nichidoku Jukogyo Kk Continuous casting method for metal and particularly steel
KR20010054878A (en) * 1999-12-08 2001-07-02 이구택 Method for continuously casting to prevent the edge crack default
CN113176292A (en) * 2021-03-23 2021-07-27 中冶南方连铸技术工程有限责任公司 Judgment method for grain boundary embrittlement of casting blank

Also Published As

Publication number Publication date
JPS5910846B2 (en) 1984-03-12

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