Vanadium-containing microalloyed steel, cored wire containing niobium-iron alloy and fluorite, application of cored wire, molten steel and preparation method of molten steel

• Main Authors: LUO KAIJIN, ZHANG GUOCAI, DENG TONGWU, LI ZHENGRONG, LIU MING
• Format: Patent
• Language: Chinese; English
• Published: 17.09.2014
• 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 provides a cored wire containing a niobium-iron alloy and fluorite and an application thereof. The cored wire comprises a core and an outer layer wrapping the core, wherein the core is a mixture containing a vanadium-iron alloy, silicon-manganese nitride, the niobium-iron alloy and fluorite. The invention provides molten steel and a preparation method thereof. The method comprises the step of feeding the cored wire into the molten steel to be subjected to vanadium-nitrogen alloying to carry out vanadium-nitrogen alloying. The invention provides vanadium-containing microalloyed steel. The cored wire is used for achieving vanadium-nitrogen alloying of the molten steel, can effectively increase the nitrogen content according to the requirements, without affecting the vanadium content, and can produce vanadium-containing steel with higher nitrogen content according to the requirement of the molten steel. The vanadium-nitrogen microalloyed steel obtained after casting the vanadium-nitrogen alloyed mo