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Low-basicity synthetic slag for external refining

A technology of out-of-furnace refining and low alkalinity, which is applied in the field of synthetic slag in the field of metallurgy, can solve the problems of easy corrosion of ladles and agglomeration, and achieve the effects of inhibiting ladle erosion, superior cold drawing performance, and good control level

Active Publication Date: 2013-05-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a low-alkalinity slag used in the out-of-furnace refining of spring steel and cord steel that is easy to corrode and agglomerate in the production process. Synthetic slag can effectively inhibit ladle erosion while realizing plasticization of inclusions

Method used

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  • Low-basicity synthetic slag for external refining

Examples

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Embodiment 1

[0015] The low-basicity synthetic slag used for refining outside the furnace in this embodiment consists of the following components by weight percentage: CaO: 37.27%, SiO 2 : 41.64%, Al 2 o 3 : 3.81%, MgO: 8.86%, CaF 2 : 6.78%, FeO: 0.89%, and the balance is other unavoidable impurities.

Embodiment 2

[0017] The low-basicity synthetic slag used for refining outside the furnace in this embodiment consists of the following components by weight percentage: CaO: 39.33%, SiO 2 : 36.71%, Al 2 o 3 : 3.78%, MgO: 10.53%, CaF 2 : 7.62%, FeO: 1.16%, and the balance is other unavoidable impurities.

Embodiment 3

[0019] The low-basicity synthetic slag used for refining outside the furnace in this embodiment consists of the following components by weight percentage: CaO: 30.52%, SiO 2 : 44.97%, Al 2 o 3 : 5.00%, MgO: 9.10%, CaF 2 : 9.03%, FeO: 1.36%, and the balance is other unavoidable impurities.

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Abstract

The invention relates to a synthetic slag in the metallurgy field, in particular to a low-basicity synthetic slag for external refining. The low-basicity synthetic slag for external refining consists of the following components according to weight percentage: 30 to 40 percent of CaO, 35 to 45 percent of SiO, lower than or equal to 5 percent of Al2O3, 8 to 15 percent of MgO, 6 to 15 percent of CaF2, lower than or equal to 2 percent of FeO, the rest of the components is unavoidable impurities, and the sum of all the components is 100 percent. Due to the low-basicity synthetic slag for external refining disclosed by the invention, steel ladles can be effectively inhibited from corrosion while the impurities are plasticized, the control levels of the impurities of the manufactured spring steels and core thread wire rods steel are good, the cold drawing property is excellent, the widths of the impurities of the wire rods are stabilized below 10um, and most of the widths of the impurities of the wire rods are less than 5um.

Description

technical field [0001] The invention relates to a synthetic slag in the field of metallurgy, specifically a low-alkalinity synthetic slag for refining outside the furnace, especially suitable for smelting spring steel, cord steel and other steel types that require extremely high plasticization of inclusions. Low alkalinity synthetic slag containing fluorine and magnesium for external refining. Background technique [0002] In recent years, with the rapid development of China's automobile industry, the market demand for spring steel and cord steel is increasing. According to statistics, the domestic supply and demand for spring steel will be more than 1.5 million tons in 2010, and the demand for cord steel will be more than 1.5 million tons. The supply and demand will be more than 600,000 tons. The important parts of the automobile engine, the valve spring, the suspension spring of the shock absorber system, the clutch spring and the steel cord for the automobile tire, etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/076
CPCY02P10/242Y02P10/20
Inventor 沈朴恒王德炯
Owner NANJING IRON & STEEL CO LTD
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