Novel composite modifier for austenitic manganese steel

Abstract

The invention discloses a novel composite modifier for austenitic manganese steel, comprising rare earth alloy, ferrotitanium, calcium silicon and aluminum, wherein the dosage of the Re-containing rare earth alloy accounts for 0.20-0.25 percent of the weight of molten steel; the dosage of the ferrotitanium accounts for 0.02-0.03 percent of the weight of the molten steel; the dosage of the calciumsilicon accounts for 0.20-0.25 percent of the weight of the molten steel; and the dosage of the aluminum accounts for 0.15-0.20 percent of the weight of the molten steel. 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; one third of the rare earth alloy is added to a molten pool, and the aluminum is added before the tapping of the molten steel. Treatment outside the furnace is to add the calcium silicon, two thirds of the rare earth alloy and the ferrotitanium to a steel ladle. The adoption of the Re-Ca-Ti-Al multi-element composite modifier prolongs the effective time of the modification process of the molten steel and guarantees good modification effect.

Description

technical field [0001] The invention relates to a compound modifier 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 of ...

AI Technical Summary

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

Images