HIGH TENSION STEEL SUPERIOR IN RESISTANCE TO STRESS AGING, AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide high tension steel superior in resistance to stress aging, with a tensile strength of 600 MPa or more. SOLUTION: The steel comprises including 0.01-0.10% C, 0.30% or less Si, 1.00-2.50% Mn, 0.005% or less S, 0.010% or less P, 0.005-0.06% Nb, 0.004-0.025% Ti, 0.05% or...

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Bibliographische Detailangaben
1. Verfasser:	OKAGUCHI HIDEJI
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 MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide high tension steel superior in resistance to stress aging, with a tensile strength of 600 MPa or more. SOLUTION: The steel comprises including 0.01-0.10% C, 0.30% or less Si, 1.00-2.50% Mn, 0.005% or less S, 0.010% or less P, 0.005-0.06% Nb, 0.004-0.025% Ti, 0.05% or less sol.Al, 0.0050% or less N, 0.003% or less O, 0-1.5% Cu, 0-2.5% Ni, 0-0.80% Mo, 0-1.0% Cr, 0-0.1% V 0-0.03% Zr, 0-0.0030% Ca, and 0-0.002% B, and having a value A defined in an expression 'A=50N+C+0.3Si+10(P+O)' of 0.44 or less, and a value B defined in an expression 'B=(50N+C+100)/(4Nb+10Ti+2sol.Al)' of 1.6 or less.