Preparation method of low-carbon low-oxygen-position sulfur free-cutting steel

• Main Authors: XU XUDONG, WEI SHIKUN, HU ZHIYONG, CHEN PENGTAO, TANG QIANJIN, LI LIN, ZHOU YANG, LU CHUAN
• Format: Patent
• Language: Chinese; English
• Published: 12.11.2021
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a preparation method of low-carbon low-oxygen-position sulfur free-cutting steel, and belongs to the field of metallurgical manufacturing. The method comprises the operation steps: (1) converter smelting; (2) converter tapping; (3) deoxidizing and alloying; (4) LF treatment; and (5) continuous casting, wherein the low-carbon low-oxygen-position sulfur free-cutting steel is finally generated. The free-cutting steel prepared through the method has few surface pores, the product quality is improved, the continuous drawing heats of molten steel are increased, the quantity of waste blanks is reduced, and the production cost is reduced. The oxygen content of a molten steel crane ladle is accurately controlled, the appropriate range is controlled, the molten steel flowability is guaranteed, and surface pores of casting blanks are reduced; and in addition, the free-cutting steel can stably control total oxygen to be within 20-60 ppm, the surface pores of the casting blanks are effectively redu