METHOD FOR MANUFACTURING ROUGH-SHAPED PRODUCT MADE OF HIGH STRENGTH STEEL

PROBLEM TO BE SOLVED: To provide a method for manufacturing a rough-shaped product made of a high strength steel at a low cost. SOLUTION: The steel having chemical composition composed of, by mass%, 0.4-0.9% C, 0.1-1.5% Si, 0.5-2.0% Mn, 0.3-0.9% V, ≤0.10% P, 0.005-0.2% S, 0.01-0.05% Al, 0.003-0.020%...

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Bibliographische Detailangaben
1. Verfasser:	OFUJI YOSHIHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS FORGE FURNACES FORGING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HAMMERING 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 PRESSING METAL PUNCHING METAL RIVETING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing a rough-shaped product made of a high strength steel at a low cost. SOLUTION: The steel having chemical composition composed of, by mass%, 0.4-0.9% C, 0.1-1.5% Si, 0.5-2.0% Mn, 0.3-0.9% V, ≤0.10% P, 0.005-0.2% S, 0.01-0.05% Al, 0.003-0.020% N and the balance Fe with impurities and as impurity, ≤0.0015% O, is subjected to heating to 1,100-1,300°C and then, to hot-forging with the finish-temperature made to be ≥900°C. After completing the hot-forging, a part of the forged material is cooled to 480-600°C at cooling rate of 3-100°C/second and thereafter, this material is air-cooled. COPYRIGHT: (C)2011,JPO&INPIT