HIGH-TENSILE STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS

A high tensile strength steel plate has a chemical composition including, by mass%: C: 0.08% to 0.15%; Mn: 0.80% to 1.60%; Ni: 3.00% to 4.50%; Cr: 0.50% to 1.00%; Mo: 0.50% to 1.00%; Al: 0.020% to 0.085%; N: 0.0020% to 0.0070%; and B: 0.0005% to 0.0020%, in which a plate thickness t mm is more than...

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Bibliographische Detailangaben
Hauptverfasser:	SAITOH Naoki, SAWAMURA Mitsuru, KAWABATA Norimasa, NAMBA Toshiaki, TAKAMINE Fumitoshi
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A high tensile strength steel plate has a chemical composition including, by mass%: C: 0.08% to 0.15%; Mn: 0.80% to 1.60%; Ni: 3.00% to 4.50%; Cr: 0.50% to 1.00%; Mo: 0.50% to 1.00%; Al: 0.020% to 0.085%; N: 0.0020% to 0.0070%; and B: 0.0005% to 0.0020%, in which a plate thickness t mm is more than 200 mm and not more than 300 mm, in the chemical composition, Ts is 380 to 430, Ceq is 0.80 to 1.05, Ac1 is 580 to 647, and x is 46 to 90, a total amount of martensite and bainite is 99% to 100% by area%, a tensile strength is 780 MPa to 930 MPa, and an absorbed energy of a thickness middle portion obtained by a charpy impact test at -60°C is 69 J or more.