Title:
PRODUCTION OF STEEL BAR FOR LOW TEMPERATURE USE
Document Type and Number:
Japanese Patent JPS6213523
Kind Code:
A
Abstract:
PURPOSE: To produce a steel bar having superior toughness at low temp. by regulating the components of a steel and subjecting the steel to hot rolling, rapid cooling and reheating under specified conditions.
CONSTITUTION: The composition of a steel is composed of, by weight, 0.05W0.3% C, ≤0.4% Si, 0.5W3% Mn, 0.5W2% Ni, 0.01W0.09% acid-sol. Al, ≤0.1% Nb and/or ≤0.1% Ti and the balance Fe with inevitable impurities. The steel is heated to ≤1,100°C, hot rolled at 700W850°C finishing temp., rapidly cooled at once to ≤300°C surface temp. and reheated to 400W550°C surface temp.
Inventors:
UENO TAKASHI
OBA TETSUYA
SAKAGUCHI SATOSHI
HARADA TAKEO
IORI FUMITAKA
TAKAHASHI TAKESHI
OBA TETSUYA
SAKAGUCHI SATOSHI
HARADA TAKEO
IORI FUMITAKA
TAKAHASHI TAKESHI
Application Number:
JP15060585A
Publication Date:
January 22, 1987
Filing Date:
July 09, 1985
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
C21D8/08; C21D8/06; C22C38/00; C22C38/14; (IPC1-7): C21D8/06; C22C38/14
Attorney, Agent or Firm:
Akizawa Masamitsu
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