JPS57152430A - Cooling method for obtaining steel plate of reduced hardness irregularity in thickness direction - Google Patents

Cooling method for obtaining steel plate of reduced hardness irregularity in thickness direction

Info

Publication number
JPS57152430A
JPS57152430A JP3659481A JP3659481A JPS57152430A JP S57152430 A JPS57152430 A JP S57152430A JP 3659481 A JP3659481 A JP 3659481A JP 3659481 A JP3659481 A JP 3659481A JP S57152430 A JPS57152430 A JP S57152430A
Authority
JP
Japan
Prior art keywords
steel plate
water flow
density
temp
hardness
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
JP3659481A
Other languages
Japanese (ja)
Inventor
Hiroe Nakajima
Yasumitsu Onoe
Ryo Tamuki
Fukuo Katsuta
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 JP3659481A priority Critical patent/JPS57152430A/en
Publication of JPS57152430A publication Critical patent/JPS57152430A/en
Pending 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling

Abstract

PURPOSE:To make the hardness in the central part of a steel plate almost the same as the hardness of the surface by dividing the temp. region from the end temp. of the rolling and finishing up to ordinary temp. to two stages, and cooling the steel plate weakly in the fore stage and strongly in the post stage. CONSTITUTION:After a steel plate is cooled to Ac3-1,250 deg.C, it is completed of rolling at >=Ar3, Next, this rolled steel plate is cooled at the density of the water flow at which the desired hardness of the steel plate surface is obtained, for example, at about 0.3-0.7m<3>/min.m<2> density of the water flow. When the temp. of the steel plate surface attains the temp. to determine the final hardness of the steel plate surface, the steel plate is cooled at the density of the water flow higher than the above-described density of the water flow, for example, at >=1m<3>/min.m<2> density of the water flow.
JP3659481A 1981-03-16 1981-03-16 Cooling method for obtaining steel plate of reduced hardness irregularity in thickness direction Pending JPS57152430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3659481A JPS57152430A (en) 1981-03-16 1981-03-16 Cooling method for obtaining steel plate of reduced hardness irregularity in thickness direction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3659481A JPS57152430A (en) 1981-03-16 1981-03-16 Cooling method for obtaining steel plate of reduced hardness irregularity in thickness direction

Publications (1)

Publication Number Publication Date
JPS57152430A true JPS57152430A (en) 1982-09-20

Family

ID=12474100

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3659481A Pending JPS57152430A (en) 1981-03-16 1981-03-16 Cooling method for obtaining steel plate of reduced hardness irregularity in thickness direction

Country Status (1)

Country Link
JP (1) JPS57152430A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864320A (en) * 1981-10-14 1983-04-16 Kobe Steel Ltd Cooling equipment for thick steel plate
JPS59173216A (en) * 1982-11-24 1984-10-01 フオルクスアイグナ−・ベトリ−プ・スタ−ル−ウント・ヴアルツヴエルク゛ヴイルヘルムフロ−リン゛ Rolled steel straightness improvement
JPS6087914A (en) * 1983-10-19 1985-05-17 Nippon Steel Corp On-line cooling method of hot steel plate
JPH0559458A (en) * 1991-09-02 1993-03-09 Kobe Steel Ltd Production of controlledly cooled steel plate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864320A (en) * 1981-10-14 1983-04-16 Kobe Steel Ltd Cooling equipment for thick steel plate
JPS6241294B2 (en) * 1981-10-14 1987-09-02 Kobe Steel Ltd
JPS59173216A (en) * 1982-11-24 1984-10-01 フオルクスアイグナ−・ベトリ−プ・スタ−ル−ウント・ヴアルツヴエルク゛ヴイルヘルムフロ−リン゛ Rolled steel straightness improvement
JPS6087914A (en) * 1983-10-19 1985-05-17 Nippon Steel Corp On-line cooling method of hot steel plate
JPH0534093B2 (en) * 1983-10-19 1993-05-21 Nippon Steel Corp
JPH0559458A (en) * 1991-09-02 1993-03-09 Kobe Steel Ltd Production of controlledly cooled steel plate

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