| 摘要 |
PURPOSE: Provided is a method of manufacturing non-quenched-and-tempered high tensile strength steel (tensile strength: 100kg/mm¬2) for the application to forge components. CONSTITUTION: The non-quenched-and-tempered high tensile strength steel is manufactured by hot rolling a steel comprising C 0.04-0.15wt.%, Si 0.10-0.70wt.%, Mn 0.8-2.0wt.%, Cr 0.30-1.5wt.%, Ni 0.10-0.50wt.%, W 0.2-2.0wt.%, Ti 0.01-0.04wt.%, B 0.0008-0.0040wt.%, P 0.030wt.% or less, a balance of Fe, and other inevitable impurities; forging after reheating in the temperature range of 1200 to 1300deg.C; finish forging at over 1000deg.C; and then quenching to ambient temperatures in a cooling rate of 200°C /min.
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