Method for reducing smelting cost of Q460C-2 low alloy steel

Abstract

The embodiment of the invention provides a method for reducing the smelting cost of Q460C-2 low-alloy steel. The method comprises the steps that final slag obtained after slag splashing treatment in a furnace is completely left in the furnace for smelting of the furnace, and 30-35 tons of waste steel and 170-180 tons of molten iron are added into the furnace for smelting, wherein the target of the final slag is that the alkalinity is 3.0-3.5, the TFe content is 18-25%, and the MgO content is 7-9%. Through the two aspects of early-stage dephosphorization and later-stage dephosphorization, the purpose of efficient dephosphorization is achieved through early-stage low temperature and large slag amount and later-stage high oxidability, high alkalinity and large slag amount, and a guarantee is provided for further replacing metal manganese with silicon-manganese alloy and further reducing the smelting cost.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for reducing the smelting cost of Q460C-2 low-alloy steel. Background technique [0002] With the development of industry, the cost is very important for iron and steel enterprises. Q460C-2 belongs to low-alloy high-strength steel, but due to the characteristics of steel grades, low P control is required. In practice, silicon-manganese alloys and metal-manganese alloys are usually used. Normally, One ton of manganese metal needs to be added to each furnace. However, due to the high price of manganese metal, the cost per ton of steel has risen sharply, which is not conducive to market price competition. Therefore, based on the perspective of smelting technology, the cost control of Q460C-2 low alloy steel is realized. become an urgent problem to be solved. Contents of the invention [0003] The embodiment of the present invention provides a method for reducing the s...

AI Technical Summary

Problems solved by technology

[0002] With the development of industry, the cost is very important for iron and steel enterprises. Q460C-2 belongs to low-alloy high-strength steel, but due to the characteristics of steel grades, low P control is required. In practice, silicon-manganese alloys and metal-manganese alloys are usually used. Normally, One ton of manganese metal needs to be added to each furnace. However, due to the high price of manganese metal, the cost per ton of steel has risen sharply, which is not conducive to market price competition. Therefore, based on the perspective of smelting technology, the cost control of Q460C-2 low alloy steel is realized. become an urgent problem to be solved