High-pressure bottom-blowing refining casting device and method for smelting high-nitrogen steel by using same

Abstract

The invention discloses a high-pressure bottom-blowing refining casting device and a method for smelting high-nitrogen steel by using the same. The casting device main body is a lamellar barrel-shaped structure; the structure from the outside to the inside is as follows: a safety flame retardant layer, a water-cooling copper crucible layer and a cutting refractory sheet, wherein an induction coil is spiral and wound on the outer wall of the safety flame retardant layer; the induction coil is connected with an electric control cabinet regulating device; a bottom-blowing system is arranged on a water-cooling movable bottom plate. The method for smelting high-nitrogen steel by using the device comprises the steps of loading, shell-producing, smelting, casting and hoisting. According to the invention, remarkable effects are as follows: refining and casting are completed in a same container, and are quick and convenient. High-nitrogen steel is produced under a high-pressure bottom-blowing condition, and efficiency is high; a cheap nitrogen gas is applied as a nitriding source, so that cost is saved. And steel ingot content is high and solidification quality is good.

Description

technical field [0001] The invention belongs to the application field of high-pressure refining and casting special steel, and in particular relates to a device for refining and casting special steel under high-pressure conditions and a method for smelting high-nitrogen steel. A refining and casting device for efficiently producing high-nitrogen steel by bottom blowing method and a method for smelting high-nitrogen steel with it. Background technique [0002] High nitrogen steel (High Nitrogen Steels, HNS) is a special steel with superior performance, in which nitrogen is a beneficial alloying element, which can stabilize and expand the austenite phase region, increase the strength of steel without reducing plasticity and toughness, and improve Corrosion resistance of steel (including pitting corrosion, crevice corrosion, stress corrosion, etc.). [0003] When the nitrogen content exceeds 0.4%, the beneficial effect of nitrogen can be quickly highlighted. However, adding n...

AI Technical Summary

Problems solved by technology

Among them, nitriding alloys are added during the smelting process to provide nitrogen elements required for high-nitrogen stainless steel. The nitrogen addition method is simple and easy to operate, but the problem is that the yield of nitrogen during alloying is low, and the nitrogen content in the steel is not easy to control. During the smelting process, nitrogen bubbles are easy to form in the high-nitrogen area; ferrochromium nitride and ferromanganese nitride generally have high impurity content, which pollutes molten steel; nitrided alloys are expensive, and high-nitrogen chromium nitride and manganese nitride require multiple steps metallurgical treatment

[0009] From the above analysis, it can be seen that the reaction speed is slow, the smelting process and smelting time are long, and the equipment is huge and complicated, all of which make the production cost high. At present, the research on high nitrogen steel is still immature and there are many problems, which make the industrialization of high nitrogen steel Smelting development is limited

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