A method for smelting high-alloy steel with 8.0% mn content

Abstract

The invention discloses a smelting method of high-alloy steel with the content of Mn being 8.0%. The high-alloy steel comprises the chemical components of, by mass percent, 0.95-1.05 of C, 0.40 or less of Si, 7.00-9.00 of Mn, 0.020 or less of P, 0.020 or less of S, 1.20-1.70 of Cr, 0.30-0.40 of Mo, 0.15-0.25 of V, and the balance being iron and inevitable impurities. The smelting process includes the paths of pretreatment of molten iron, steelmaking through a converter and an intermediate frequency furnace, refining through an LF furnace, refining through an RH furnace and conduction through a continuous casting machine, wherein molten iron is used in the whole smelting process of the converter, and the tapping temperature of the converter is 1630 DEG C or higher. Chemical components of tapping molten iron of the converter comprise, by mass percent, 0.10 or more of C, 0.005 or less of P, 0.015 or less of S, and the balance being iron and inevitable impurities. The high-alloy steel with the content of Mn being 8.0% is low in cost, compared with high-alloy steel with the content of Mn being 8.0% and smelted through a stainless steel line, the cost of the high-alloy steel with the content of Mn being 8.0% smelted through the method can be reduced by 690 yuan per ton.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for smelting high-alloy steel with an Mn content of 8.0%. Background technique [0002] Steel with high wear resistance, because of its good mechanical properties at low temperature, it is widely used in railroad turnouts, point switches, jaw plates, lining plates of stone crushers, bulletproof plates, safe steel plates and Track shoes of tractors, tanks, etc. With the increasing market demand for high wear resistance products, the production of high wear resistance steel grades has become a development trend in the metallurgical industry. [0003] However, due to the very high alloy content of this type of steel, the traditional carbon steel smelting process has no refining facilities such as VOD, so it can only add a large amount of alloy after the converter furnace or the LF furnace refining process, but both will cause the molten steel temperature to drop too m...

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Problems solved by technology

[0003] However, due to the very high alloy content of this type of steel, the traditional carbon steel smelting process has no refining facilities such as VOD, so it can only add a large amount of alloy after the converter furnace or the LF furnace refining process, but both will cause the molten steel temperature to drop too much. The melting time of the alloy in the steel is long, which makes it difficult to adjust the composition of the steel and cannot meet the production rhythm, so continuous casting production cannot be realized

Therefore, at present, such high-alloy steel types cannot adopt the traditional carbon steel smelting process to produce continuous casting slabs, and are generally produced by stainless steel smelting process, which leads to an increase in the production cost of steel types, occupies stainless steel production resources, and affects stainless steel production capacity.

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