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A kind of molten steel smelting method

A technology for molten steel smelting and molten steel, which is applied in electric furnaces, furnaces, and the improvement of process efficiency, can solve problems such as alloy waste and chromium loss, and achieve the effects of avoiding waste, reducing smelting costs, and avoiding loss of metal elements.

Active Publication Date: 2018-05-18
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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Problems solved by technology

[0002] The smelting of our company's refined molten steel adopts the traditional electric arc furnace-refining furnace production process. The oxidation time is long, so a large amount of metal elements such as chromium, silicon, manganese, etc. are almost completely lost. In order to make the molten steel obtained in the final smelting meet the standard, it is necessary to add various alloys in the furnace during smelting in the refining furnace, resulting in double waste of alloys.

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  • A kind of molten steel smelting method
  • A kind of molten steel smelting method

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Embodiment 1

[0035] Taking the smelting of DJDQ material electrode ingots as an example, the chemical composition requirements are:

[0036]

[0037] step 1:

[0038] 5.12t of ordinary steel scrap (0.4% silicon, 0.5% manganese, 0.07% chromium), 6.01t waste rollers of the same material (0.8% silicon, 1.0% manganese, 1.0% chromium), and 10.05t returned steel scrap-D1 scrap (0.6 silicon %, manganese 0.20%, chromium 4.0%), return steel cutting-Q2 chips 11.02t (silicon 1.85%, manganese 0.9%, chromium 0.30%), return forging head-5# head 6.98t (silicon 0.6%, manganese 0.5%, chromium 3.0%), and 7.05t of cast steel injection (0.5% silicon, 0.6% manganese, 0.8% chromium) are sent to the electric arc furnace for preliminary refining of molten steel. During the melting period, oxygen is blown to help the melting. When the charge is basically melted to form a liquid, oxygen is mainly blown into the molten steel, the oxygen pressure is controlled at 0.4MPa, and slag is formed in advance at the end o...

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Abstract

The invention discloses a molten steel smelting method, and belongs to the technical field of smelting. The molten steel smelting method comprises the following special steps: step 1, furnace burden needed by molten steel are sorted, the sorted furnace burden is respectively sent in an electric arc furnace and a medium frequency furnace to be smelted, furnace burden needed by molten steel with higher content of Cr, Si and Mn alloying elements enters the medium frequency furnace to be smelted, and furnace burden needed by the rest of molten steel enters the electric arc furnace to be used for preliminary molten steel smelting; step 2, the molten steel obtained through smelting in the step 1 enters an LF refining furnace to be smelted; and step 3, the molten steel obtained through smelting in the step 2 enters a VD refining furnace to be smelted. The molten steel smelting method has the advantages that the alloying elements in the furnace burden can be recovered into the molten steel well, the addition of the alloys in the refining process is reduced, the smelting cost is lowered, and the molten steel smelting quality is improved.

Description

technical field [0001] The invention relates to a smelting method, in particular to a molten steel smelting method, which belongs to the technical field of smelting. Background technique [0002] The smelting of our company's refined molten steel adopts the traditional electric arc furnace-refining furnace production process. Oxidation time is long, so a large amount of metal elements such as chromium, silicon, manganese, etc. are almost completely lost. In order to make the molten steel obtained from the final smelting meet the standard, various alloys need to be added to the furnace during smelting in the refining furnace, resulting in double waste of alloys. Contents of the invention [0003] The technical problem to be solved in the present invention is to provide a molten steel smelting method, which can better recover the alloy elements in the charge to molten steel, reduce the amount of alloy added in the refining process, reduce smelting costs, and improve the qual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 刘振宇王洪祥
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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