Posco

Kee-Cheol Park

Kyoo-Young Lee

Gyo-Sung Kim

Chang-Hoon Lee

Han-Chul Shin

Jea-Chun Jeon

Jae-Chun Jeon

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&#xd7;48/14&#xd7;[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 &#x3bc;m; and an average grain size of ferrite is less than or equal to 5 &#x3bc;m.

Manufacturing method of carbon steel sheet superior in formability

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&#xd7;48/14&#xd7;[N]% when the condition of B(atomic %)/N(atomic %)&#x3e;1 is satisfied or by 0.5&#xd7;48/14&#xd7;[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 &#x3bc;m; and an average grain size of ferrite is less than or equal to 5 &#x3bc;m.

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Pohang, South Korea

Kee-Cheol Park