The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2012
Filed:
Dec. 26, 2006
Kyoo-young Lee, Gwangju, KR;
Gyo-sung Kim, Pohang-shi, KR;
Han-chul Shin, Pohang-shi, KR;
Chang-hoon Lee, Kyungsan-shi, KR;
Kee-cheol Park, Pohang-shi, KR;
Jae-chun Jeon, Pohang-shi, KR;
Kyoo-Young Lee, Gwangju, KR;
Gyo-Sung Kim, Pohang-shi, KR;
Han-Chul Shin, Pohang-shi, KR;
Chang-Hoon Lee, Kyungsan-shi, KR;
Kee-Cheol Park, Pohang-shi, KR;
Jae-Chun Jeon, Pohang-shi, KR;
Posco, Pohang, KR;
Abstract
A carbon steel sheet having high formability due to a microscopic and uniform carbide distribution and having a good characteristic of final heat treatment, and a manufacturing method thereof. The carbon steel sheet having excellent formability, includes, in wt %, C at 0.2-0.5%, Mn at 0.1-1.2%, Si at less than or equal to 0.4%, Cr at less than or equal to 0.5%, Al at 0.01-0.1%, S at less than or equal to 0.012%, Ti at less than or equal to 0.5×48/14×[N]% when the condition of B(atomic %)/N(atomic %)>1 is satisfied or by 0.5×48/14×[N]% to 0.03% when the condition of B and N is not satisfied, B at 0.0005-0.0080%, N at less than or equal to 0.006%, Fe, and extra inevitable elements; an average size of carbide is less than or equal to 1 μm; and an average grain size of ferrite is less than or equal to 5 μm.