HIGH STRENGTH THICK STEEL PLATE EXCELLENT IN CTOD(CRACK TIP OPENING DISPLACEMENT) CHARACTERISTIC, AND ITS MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a high strength thick steel plate of >=1 inch thick, having >=700 MPa tensile strength and a critical CTOD value of >=0.25 mm in heat affected zone as well as >=0.5 mm in base material at -30 deg.C, and provide its production method. SOLUTION: This high s...

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1. Verfasser: OKAGUCHI HIDEJI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a high strength thick steel plate of >=1 inch thick, having >=700 MPa tensile strength and a critical CTOD value of >=0.25 mm in heat affected zone as well as >=0.5 mm in base material at -30 deg.C, and provide its production method. SOLUTION: This high strength thick steel plate has a composition containing 0.01-0.04% C, 0.50-2.00% Mn, 0.70-1.75% Cu, 0.50-3.50% Ni, 0.004-0.02% Ti, 0.0005-0.0015% B,