Double- modification method for advanced austenitic manganese steel

Abstract

The invention discloses an advanced double-modification method for austenitic manganese steel. The method comprises the following steps that: after ferromanganese is added to molten steel for the fine adjustment of manganese content, Re-containing rare earth alloy accounting for 0.067-0.081 percent of the weight of the molten steel and vanadium slag accounting for 2.0-2.5 percent of the weight of the molten steel are orderly added to a molten pool; aluminum accounting for 0.15-0.20 percent of the weight of the molten steel is added in before the tapping of the molten steel; calcium silicon accounting for 0.04-0.06 percent of the weight of the molten steel, Re-containing rare earth alloy accounting for 0.133-0.169 percent of the weight of the molten steel, ferrotitanium accounting for 0.02-0.03 percent of the weight of the molten steel, as well as zinc accounting for 0.006-0.008 percent of the weight of the molten steel are added to a steel ladle outside a furnace. The comprehensive mechanical property and wear resistance of austenitic manganese steel are improved through double modification.

Description

technical field [0001] The invention relates to a modification treatment method for austenitic manganese 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, because the smelting is carried out according to the traditional smelting process, usually no modification treatment and inoculation treatment are performed. The carbides in the as-cast structure of the austenitic steel produced by this process are distributed in a network along the grain boundaries. When the carbon content is high, the network carbides are more developed and the network is thicker, resulting in a very brittle material. Second, the non-metallic inclusions in molten steel are usually distributed in a network shape. These characteristics n...

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Problems solved by technology

Chinese patent CN1219103C discloses a manufacturing method of manganese steel, which uses rare earth alloy and ferrovanadium to carry out compound modification 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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