PRODUCTION OF BAINITIC HIGH TENSILE HOT ROLLED STEEL STRIP

Japanese Patent JP3716639

B2

PROBLEM TO BE SOLVED: To provide a method for producing a bainitic high tensile hot rolled steel strip capable of obtaining uniform characteristics in the steel strip.
SOLUTION: This method is provided with a process in which a rough bar or a thin slab of steel contg., by weight, 0.02 to 0.15% C, 0.3 to 2.5% Si, 0.5 to 2.5% Mn, ≤0.1% P, ≤0.01% S, 0.005 to 0.08% solAl and ≤0.008% N is produced, a process in which the rough bar or thin slab is heated, a process in which the heated rough bar or thin slab is finish-rolled at the finishing temp. equal to or above the Ar3 transformation point at a fixed rolling rate in the range of 100 to 850 mpm and a process in which the steel strip after the finish rolling is cooled to ≤700°C at a cooling rate of ≥10°C/s and is thereafter coiled within the temp. range of 300 to 550°C. Moreover, the fluctuation of the finishing temp. in the steel strip is controlled to ≤50°C by heating the rough bar or thin slab.

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Satoshi Kobayashi
Toshiaki Urabe
Tetsuo Yamamoto
Akimasa Kido

JP25702098A

November 16, 2005

September 10, 1998

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jfe Steel Corporation

B21B3/00; C21D1/42; C21D9/46; C22C38/00; C22C38/06; C22C38/58; (IPC1-7): C21D9/46; B21B3/00; C21D1/42; C22C38/00; C22C38/06; C22C38/58

JP9225517A
JP4325657A
JP3146640A
JP2179847A
JP9235624A
JP10053836A
JP60184630A

Yasumitsu Nakahama

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