Steel sheet and method for manufacturing the same
The method for manufacturing steel sheet comprises the steps of: rough-rolling to form a sheet bar; finish-rolling the sheet bar to form a steel strip; applying primary cooling and secondary cooling to the finish-rolled steel strip; and coiling the secondary-cooled steel strip. The primary cooling is conducted at cooling speeds of 120&deg; C./sec or more down to the temperatures of from 500 to 800&deg; C. The secondary cooling is conducted at cooling speeds of less than 60&deg; C./sec.
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Sadanori Yasuhide Yoichi Toru Tadashi Hiroyasu
Imada Ishiguro Motoyashiki Inazumi Inoue Kikuchi