Preparation method of manganese-based MnAlSiTi alloy with high titanate content

Abstract

The invention discloses a manganese-based MnAlSiTi alloy with high titanate content. The MnAlSiTi alloy contains the following chemical components in percent by mass: 40-55% of Mn, 12-18% of Al, 13-22% of Si, 1-2% of Ti and the balance of Fe and impurity elements. The preparation method comprises the following steps of: weighing aluminium scraps, ferrotitanium, pure aluminium, a silicon manganese alloy and a slag former according to the requirement of simple substance elements, sequentially adding the aluminium scrap, the ferrotitanium, the pure aluminium, the silicon manganese alloy and the slag former into an induction furnace to be smelted; and solidifying by adopting a slow-fast-slow way. The alloy prepared by the invention has high manganese content and high titanate content, the range of charging content of raw material carbon and other impurity elements can be widened, and the cost is low; and the prepared alloy can be stored under various weather conditions with stable structure and without pulverization. The alloy has the advantages of high deoxidizing capacity, high impurity removing rate, good alloying effect, high fatigue resistance and high earthquake resistance.

Description

technical field [0001] The invention relates to the technical field of master alloys for steelmaking, in particular to a manganese-based MnAlSiTi alloy with high titanium content and a preparation method thereof. The alloy can be used for deoxidation and alloying of molten steel such as shock-resistant steel, stainless steel, and titanium-containing steel. Background technique [0002] As an essential raw material in steelmaking, manganese-based master alloys are closely related to the development of the steel industry. In the context of the rapid development of my country's steel industry, the demand for manganese-based master alloys has increased sharply. However, under the influence of the global financial crisis in 2008, my country's iron and steel industry faced major development issues such as overcapacity, energy conservation and emission reduction, and industrial restructuring. Iron and steel enterprises began to focus on low-carbon, green, environmental protection, ...

AI Technical Summary

Problems solved by technology

When the content of titanium in the alloy is low, most of the titanium elements in the alloy will form high-temperature stable compounds, so that the effective control of alloy elements will be lost during steelmaking, and the alloying effect of the composite deoxidizer will be greatly reduced

The Chinese patent CN1908195A uses the carbon content in the alloy to be less than or equal to 0.08% to prevent alloy powdering, but in the actual preparation process, controlling too low carbon content will increase the cost of manufacturing

Chinese patent CN101191172 measures to prevent alloy pulverization by controlling the carbon content <0.3%, and directly using metal manganese to replace high-carbon ferromanganese or medium-carbon ferromanganese. Although the carbon content requirement is lower than that of patent CN1908195A, direct use of metal manganese will greatly increase production cost

The technical solution to the problem of alloy pulverization proposed by the above-mentioned patents does not really solve the problem of alloy pulverization. The new point of view is that a small amount of Al 3 C 4 CH produced by hydrolysis 4 The gas can only increase the local stress of the alloy and cause cracks in the alloy, but it cannot cause the overall structure of the alloy to fail and be pulverized; the real reason for the pulverization is that there are a large number of alumina particles produced by the large amount of oxidation of Al at high temperature, and they are distributed at the same time. Because the interior of the alloy matrix and the grain boundary are not immediately removed, the interaction between the alumina inclusions and the alloy phase during the solidification process of the alloy leads to pulverization; at the same time, there are high costs, no obvious advantages in the diversification of alloy elements, and weak deoxidation ability. question

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