Smelting process for supersaturated high-nitrogen stainless steel electrode bar

Abstract

The invention discloses a smelting process for a supersaturated high-nitrogen stainless steel electrode bar, and belongs to the technical field of high-nitrogen ferrous metallurgy application. The smelting process comprises the steps of manufacturing foam slag by using coke powder in the primary smelting process, and tapping in a steel and slag remaining mode; performing slagging deoxidation, desulfurization and impurity removal treatment to molten steel flowing into a ladle refining furnace to obtain furnace slag, and meanwhile adding multiple intermediate alloys into the ladle refining furnace; determining whether to add a small amount of Al blocks or not according to the situation that the molten steel deoxidation and the furnace slag deoxidation are good or not in the process; puttingthe refined molten steel into a VD vacuum furnace for vacuum treatment, and blowing argon at the vacuum degree of no higher than 67 Pa; replacing argon with nitrogen for soft blowing and stirring themolten steel when the vacuum degree is higher than 98 Pa; controlling the temperature of the obtained supersaturated high-nitrogen molten steel to be 1525-1535 DEG C, pouring the supersaturated high-nitrogen molten steel into an electrode bar grinding tool, and then cooling and conveying the supersaturated high-nitrogen molten steel; and forging and processing the molten steel to obtain the supersaturated high-nitrogen stainless steel electrode bar.

Description

technical field [0001] The invention belongs to the technical field of high-nitrogen iron and steel metallurgy application, and in particular relates to a supersaturated high-nitrogen stainless steel electrode rod smelting process. Background technique [0002] With the in-depth research on nitrogen-containing stainless steel, humans have a clearer understanding of the positive impact of nitrogen on stainless steel. High-nitrogen steel is far superior to nitrogen-free steel in terms of mechanical and corrosion properties. At present, the research on high-nitrogen steel mainly focuses on austenitic steel or ferritic and martensitic steel; in addition, nitrogen is beneficial to steel types such as pearlitic steel and dual-phase steel. Nitrogen, as an important alloying element in steel, has broad development prospects, and the research and application of high-nitrogen steel has been paid more and more attention. Facing the implementation of global carbon dioxide emission redu...

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Problems solved by technology

Otherwise, it will inevitably result in that although the nitrogen has increased, the silicon and oxygen are unqualified.

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