Smelting method for directly turning non-quenched and tempered steel

• Main Authors: WEI SHIKUN, LIU YI, HU ZHIYONG, CHEN PENGTAO, LI LIN, LI TIANXUE, LU CHUAN
• Format: Patent
• Language: Chinese; English
• Published: 16.11.2021
• Subjects: CHEMISTRY; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS

The invention discloses a smelting method for directly turning non-quenched and tempered steel. The smelting method belongs to the field of mechanical part production, and specifically comprises the following steps: (1), converter metallurgy; (2) converter tapping; (3) deoxidizing and alloying; (4) LF treatment; (5) RH treatment; and (6) continuous casting: finally smelting to generate the directly turned non-quenched and tempered steel. The non-quenched and tempered steel smelted through the method is high in strength and toughness, and the service life is prolonged. According to the non-quenched and tempered steel provided by the invention, the total oxygen content can be stably controlled to be 15 ppm or below, the H content is 1.5 ppm or below, the N content is 100 ppm or above, the H content and the O content in the steel are effectively reduced, the N content is controlled, the product quality is improved, the high strength and the high toughness of the produced non-quenched and tempered steel are guara