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Calcium treatment method for refining molten steel under vacuum

A technology of vacuum refining and calcium treatment, applied in the field of steel refining, can solve the problems of long smelting cycle, high production cost, poor quality of molten steel, etc., to reduce molten steel inclusions, calcium absorption rate and stabilize, shorten the smelting cycle Effect

Inactive Publication Date: 2011-07-27
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Benefits of technology

The technical effect that this inventor has done during production on an offshore platform is adding special alloys called Silicone Calcobalt (C) or Magnesium Iron Aluminide (MgFe2Al2) at very high pressure for better removal of impurities from crude oil products like methane gasoline. This process helps reduce harmful metals such as manganese sulfate while also reducing unwanted substances found inside castings made by these materials.

Problems solved by technology

This technical issue addressed in this patents relates to improving the removal of impurities from molten steels while maintaining good liquidability without causing defective castings caused by excessively generated bauxite (Al203) particles that may get stuck inside the equipment's components like pipes and valves when they become clogged with these materials.

Method used

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Embodiment Construction

[0009] The present invention will be further described below through embodiment.

[0010] In the embodiment, when vacuum refining and smelting ultra-low carbon electrical steel, after aluminum deoxidation, adjust the vacuum degree to 200pa ± 50pa, add silicon-calcium-iron alloy, and the argon circulation flow rate during pure degassing is changed from 120NM 3 Adjust to 72NM after 2 minutes of cycle per hour 3 / hour, continue to circulate for 3 minutes and then finish steelmaking under negative pressure. This not only shortens the smelting cycle, but also increases the calcium content of molten steel, and reacts with inclusions in molten steel to form low-melting calcium-aluminate inclusions, thereby achieving the purpose of improving the quality of molten steel.

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Abstract

The invention relates to a calcium treatment method for refining molten steel under vacuum, aims to reduce inclusions in molten steel, and belongs to the technical field of molten steel refining. The technical scheme is that: a ferro-silicon-calcium alloy is added in the vacuum refining process, wherein the ferro-silicon-calcium alloy comprises the following components in percentage by weight: 69 to 75 percent of silicon, 0.4 to 5 percent of calcium, 18 to 23 percent of iron and less than or equal to 0.1 percent of water; by regulating the calcium content in the ferro-silicon-calcium alloy, the adding amount of the ferro-silicon-calcium alloy and pure degassing time, the calcium content of molten steel is controlled, the inclusions of the molten steel are removed and the normal continuous casting of steel is ensured. The ferro-silicon-calcium alloy is added for calcium treatment under high vacuum in an RH molten steel deoxidation later stage, the calcium absorptivity is high and stable, the inclusions of the molten steel are reduced, the smelting period is shortened, the calcium content of the molten steel is improved, and calcium is reacted with the inclusions in the molten steel to form low melting point calcium-aluminates inclusions to fulfill the aim of improving the quality of the molten steel.

Description

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Claims

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Application Information

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Owner HEBEI IRON AND STEEL
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