LANCE FOR BUBBLING PROCESS OF MOLTEN STEEL AND METHOD FOR SUPPRESSING PICK-UP OF NITROGEN

• Main Authors: SHIN, DONG YEOP, KEUM, CHANG HUN
• Format: Patent
• Language: English; Korean
• Published: 23.05.2013
• Subjects: BLASTING; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; FURNACES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; KILNS; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; OVENS; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; RETORTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; WEAPONS

PURPOSE: A lance for a bubbling process of molten steel and a method for suppressing a pick-up of nitrogen are provided to minimize a pick-up of nitrogen by preventing direct contact to the atmosphere in a naked molten metal site by having a structure where the lance supplies argon gas to an upper side of molten steel in a bubbling process of molten steel. CONSTITUTION: A lance for a bubbling process of molten steel comprises a main lance(12) and a sub lance(15). The main lance dips in the molten steel and a main gas supply route(13) where argon gas passes inside is formed. The sub lance is equipped in a top of the main lance. A sub gas supply route(18) for supplying argon gas to a surface of the molten steel is formed between the sub lance and the main lance. The sub lance has a bigger inside diameter than the main lance.