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Vacuum medium-frequency induction furnace smelting method for high-purity low-carbon steel

A smelting method and technology of purity, applied in the smelting field of high-purity low carbon steel vacuum intermediate frequency induction furnace, can solve the problems of insufficient oxidation of molten steel, and achieve the effect of high purity of molten steel

Inactive Publication Date: 2021-02-19
BAOTOU IRON & STEEL GRP
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for smelting high-purity low-carbon steel in a vacuum intermediate-frequency induction furnace to overcome the problem of insufficient oxidation of molten steel caused by non-vacuum smelting of low-carbon steel in an intermediate-frequency induction furnace

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Embodiment Construction

[0022] A method for smelting high-purity low-carbon steel in a vacuum intermediate frequency induction furnace, the chemical composition of the alloy is: carbon 0.12%-0.20%, silicon ≤ 0.30%, manganese 0.30%-0.70%, sulfur ≤ 0.045%, phosphorus ≤ 0.045%; Using pure iron as the smelting raw material, the pure iron is subjected to shot blasting treatment to remove the oxide scale on the surface of the pure iron and improve the purity of the smelting raw material; the vacuum is started before the raw material is heated, and it is always in a vacuum state before the raw material is heated and melted, reducing the smelting raw material and Furnace ambient gas content. Stop vacuuming when the raw material starts to melt, and fill with argon as a protective gas until the smelting and pouring is completed. Specifically include:

[0023] 1) Shot blasting is performed on pure iron in the smelting raw material industry to remove the oxide scale on the surface of the pure iron and improve t...

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Abstract

The invention discloses a vacuum medium-frequency induction furnace smelting method for high-purity low-carbon steel. Pure iron is adopted as a smelting raw material, shot blasting treatment is carried out on the pure iron to remove oxidized scales on the surface of the pure iron and improve the purity of the smelting raw material; vacuumizing is started before the raw material is heated, the rawmaterial is in a vacuumizing state all the time before being heated and melted, and the gas content of the smelting raw material and the gas content of the furnace body environment are reduced; and after the raw material begins to melt, vacuumizing is stopped, and argon is introduced to serve as protective gas till smelting and pouring are finished. According to the vacuum medium-frequency induction furnace smelting method for the high-purity low-carbon steel, the problem that molten steel is oxidized insufficiently due to non-vacuum smelting of a low-carbon steel medium-frequency induction furnace is solved.

Description

technical field [0001] The invention relates to a method for smelting high-purity low-carbon steel in a vacuum intermediate frequency induction furnace. Background technique [0002] Low carbon steel is carbon steel with a carbon content of less than 0.25%. It is also called mild steel because of its low strength, low hardness and softness. It includes most ordinary carbon structural steels and some high-quality carbon structural steels, most of which are used for engineering structural parts without heat treatment, and some are used for mechanical parts requiring wear resistance after carburizing and other heat treatments. [0003] Vacuum induction melting is to generate eddy current in the process of electromagnetic induction to melt the metal. This manufacturing process can be used to extract high-purity metals and alloys. It mainly includes vacuum induction furnace melting, suspension melting and cold crucible melting. Because smelting under vacuum is easy to remove n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C22C33/06C22C38/02C22C38/04C22C38/60
CPCC21C5/5241C22C33/06C22C38/02C22C38/04C22C38/60
Inventor 史超张立通
Owner BAOTOU IRON & STEEL GRP
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