Alloy adding method for medium-manganese or high-manganese alloy steel in smelting with converters

Abstract

The invention relates to an alloy adding method for medium-manganese or high-manganese alloy steel in smelting with converters. As for the medium-manganese alloy steel, dual smelting with the converters is conducted, the content of tapping P is smaller than or equal to 0.005%, the tapping temperature is higher than or equal to 1640 DEG C, and the content of tapping C is larger than or equal to 0.05%; alloying is conducted behind the converters, manganese-iron alloy is added in a large tank according to the proportion of 60 kg per ton of steel, and remaining manganese-iron alloy is added in the alloy process; argon blowing is conducted after tapping; and manganese-iron alloy is supplemented through a ladle furnace (LF) according to the proportion of 1-10 kg per ton of steel. As for the high-manganese alloy steel, dual smelting with the converters is conducted; alloying is conducted in the converters, in the semisteel state after smelting, when the content of C is equal to 0.04%, the content of P is smaller than or equal to 0.005% and the temperature is 1680+ / -10 DEG C, mixed alloy of manganese-iron alloy and aluminium particles is added, oxygen is used for point blowing for 40-60 s, the lance height is 1.5-1.8 m, and the oxygen pressure is 0.8-0.9 MPa; alloying is conducted behind the converters, and manganese-iron alloy is supplemented according to the tapping manganese component; argon blowing is conducted for 2-5 min after tapping; and RH vacuum decarburization is conducted. Through the alloy adding method, the problem that the high-manganese alloy steel cannot be produced by common steel plants can be solved effectively, the high-manganese alloy steel is produced in a converter oxidization mode, the yield of the alloy is high, and the production cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of steelmaking technology, in particular to a ferromanganese alloy adding method for converter smelting medium manganese (3.0%≥Mn≥6.0%) and high manganese (Mn>6.0%) alloy steels. Background technique [0002] With the development of the world economic situation, the competition among the iron and steel industries is becoming more and more fierce. The production of high-value-added high-alloy steel grades is not only the goal pursued by special steel mills, but also the research direction of ordinary steel mills. The ultimate goal It is to pursue the maximum profit for the enterprise. How to add a large amount of Mn alloy to the converter and ensure its stable and high yield is particularly important for the production of high-value-added high-Mn alloy steel and its cost control. [0003] At present, the smelting of high manganese alloy steel is generally produced by electric furnace. Domestic steel mills only have...

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Problems solved by technology

[0004] The invention provides a kind of medium and high manganese alloy steel produced by using a converter instead of an electric furnace. Its purpose is to solve the problem that ordinary steel plants cannot produce medium and high manganese alloy steel. By adopting different alloy addition methods, different Mn contents in the produced steel can be achieved. Alloy steel, so as to improve the alloy yield and effectively reduce production costs