Novel composite inoculant for austenitic manganese steel

Abstract

The invention discloses a novel composite inoculant for austenitic manganese steel, comprising V slag, Ti and Zn with the dosage respectively accounting for 2.0-2.5, 0.02-0.03 and 0.006-0.008 percent of the weight of molten steel, wherein the Ti element is added in the form of ferrotitanium; treatment inside a furnace is carried out in the alloying adjustment stage for the composition of the molten steel after ferromanganese is added for the fine adjustment of the manganese content of the molten steel, and the V slag is added to a molten pool; treatment outside the furnace is to add the ferrotitanium and the Zn to a steel ladle. The adoption of multiple elements for inoculation has the advantages of obviously increasing the crystallization nuclei of carbide, ensuring that the crystallization nuclei of carbide are distributed more uniformly on austenitic grains and grain boundaries, reducing the carbide, strengthening the tendency of generating granular aggregate and improving the performance of manganese steel.

Description

technical field [0001] The invention relates to a composite inoculant for austenitic steel. Background technique [0002] Traditional austenitic manganese steel (medium manganese steel, high manganese steel, ultra-high manganese steel) production process mainly has two types: one is based on the traditional smelting process after the basic composition of austenitic manganese steel is determined Smelting, since smelting according to the traditional smelting process usually does not carry out modification treatment and inoculation treatment, the carbides in the as-cast structure of the austenitic steel produced by this process are distributed in a network along the grain boundary, and when the carbon content is high This kind of network carbide is more developed, and the mesh is thicker, which makes the material very brittle. Secondly, the non-metallic inclusions in molten steel are usually distributed in a network shape. These characteristics not only cause the brittleness o...

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Problems solved by technology

Chinese patent CN1219103C discloses a manufacturing method of manganese steel, in which rare earth alloy and ferrovanadium are used for composite inoculation treatment during tapping, which can improve the toughness of manganese steel. Effective deoxidation makes rare earth metamorphism unstable; although rare earth alloys and ferrovanadium have a more obvious effect on the metamorphism effect, the morphology of pro-eutectoid austenite is lack of control due to the lack of grading treatment inside and outside the furnace; The ton price is as high as 150,000 yuan or more, which greatly increases the cost

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