THICK STEEL PLATE EXCELLENT IN BRITTLE-CRACK PROPAGATION STOP PROPERTY, AND PRODUCING METHOD THEREOF

Title:

THICK STEEL PLATE EXCELLENT IN BRITTLE-CRACK PROPAGATION STOP PROPERTY, AND PRODUCING METHOD THEREOF

Document Type and Number:

Japanese Patent JP2010001520

Kind Code:

A

Abstract:

To provide: a thick steel plate excellent in brittle-crack propagation stop property by mainly containing a bainitic structure and also, achieving the fining of crystal granular diameter in a prescribed position in the plate thickness direction; and a useful method for producing such thick steel plate.

The steel plate contains the chemical components, such as C and the balance iron with inevitable impurities and its structure is composed mainly of the bainite, and at the position of the depth t/8-t/4 (t shows the plate thickness) from the surface, when the range surrounded with large angle granular boundary having 15 orientation difference of two crystals is made as a crystal grain, the average circle diameter corresponding diameter of these crystal grains is 8 m.

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Inventors:

YAMAGUCHI TETSUO
TAMURA EIICHI

Application Number:

JP2008160617A

Publication Date:

January 07, 2010

Filing Date:

June 19, 2008

Export Citation:

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