PRODUCTION OF HIGH TENSILE STRENGTH STEEL EXCELLENT IN WELDABILITY

PROBLEM TO BE SOLVED: To inexpensively produce a high tensile strength thick steel plate excellent in weldability by subjecting a low carbon slab contg. a specified trace amt. of B to rolling under specified conditions. SOLUTION: A slab contg., by weight, 0.02 to 0.20% C, 0.02 to 0.80% Si, 0.50 to 2...

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Bibliographische Detailangaben
Hauptverfasser:	KAWABATA FUMIMARU, MISHIRO SUKETSUGU, AMANO KENICHI, ITAKURA NORITSUGU
Format:	Patent
Sprache:	eng
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:	PROBLEM TO BE SOLVED: To inexpensively produce a high tensile strength thick steel plate excellent in weldability by subjecting a low carbon slab contg. a specified trace amt. of B to rolling under specified conditions. SOLUTION: A slab contg., by weight, 0.02 to 0.20% C, 0.02 to 0.80% Si, 0.50 to 2.50% Mn, 0.005 to 0.06% Al, 0.003 to 0.020% Ti, = two kinds among Cu, Ni, Cr, Mo, Nb, V, rare earth metals and Ca is heated at 1000 to 1300 deg.C to prevent the coarsening of austenite, and carbon nitride forming elements such as Nb and V are sufficiently allowed to enter into solid solution. Subsequently, it is rolled at 40% cumulative draft at