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Protective casting method for feeding steel strips into crystallizer

A technology for protecting pouring and crystallizer, which is applied in the field of continuous casting, and can solve problems such as easy solidification of mold slag, low sleeve temperature, unfavorable protection pouring, etc.

Active Publication Date: 2015-02-04
SHANDONG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if a sleeve is added around the steel belt, the inner area of ​​the sleeve is continuously fed with the steel belt, causing the temperature in the sleeve to be too low, and the mold slag is easy to solidify, which is not conducive to protective pouring. ACCIDENT

Method used

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  • Protective casting method for feeding steel strips into crystallizer
  • Protective casting method for feeding steel strips into crystallizer

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Embodiment 1

[0028] Such as figure 1 with figure 2 As shown, molten steel 8 is housed in the crystallizer 1, and the baffle plate 3 divides the crystallizer 1 into a rectangular feeding area 6 and an ordinary area 7. Feeding zone 6 uses low melting point slag 4 , and common zone 7 uses common mold slag 2 . Since the low-melting point slag 4 in the feeding area 6 has a low melting point, is easy to melt, and has a low viscosity, when the feeding steel strip 5 is added to the molten steel 8, defects of slag inclusion can be reduced.

[0029] When the steel strip is fed to the mold, ordinary mold slag is added to the common area, and casting slag with a melting point lower than the ordinary mold slag is added to the feeding area. The cast steel type is Q345B, the width of the mold feeding steel strip is 10-20% of the mold width, the thickness is 0.1-1% of the mold length, and the feeding speed is 0.3-0.6m / s. The material of the baffle used is the same as that of the submerged nozzle, both...

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Abstract

The invention discloses a protective casting method for feeding steel strips into a crystallizer. The method comprises the following steps: (1) dividing the liquid surface of the crystallizer into a feeding area and a common area by a baffle; and (2) adding common protective slag into the common area and adding low-melting-point slag with a melting point being lower than that of the common protective slag into the feeding area when the steel strips are fed into the crystallizer. The widths of the steel strips fed into the crystallizer are 10-20% of the width of the crystallizer; the thicknesses of the steel strips fed into the crystallizer are 0.1-1% of the length of the crystallizer; the feeding rate is 0.3-0.6 meter per second. The method is low in cost and is simple and effective.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and in particular relates to a protective pouring method for a crystallizer feeding steel strip. Background technique [0002] Compared with the traditional mold casting process, the continuous casting process is a major technological progress, but inherent product defects such as low equiaxed crystal ratio, center segregation, center looseness and center cracks restrict the quality of continuous casting products. Similar to the wire feeding of the crystallizer, the steel belt feeding is to insert an ordinary carbon steel belt into the mold, and make the steel belt vibrate, and use the melting and heat absorption of the steel belt in the melt to change the temperature field of the melt in the mold. Reducing the superheat and temperature field gradient of the melt in the crystallizer, and at the same time using the mechanical movement of the steel strip to break the dendrite structure, ...

Claims

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Application Information

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IPC IPC(8): B22D11/108B22D11/111
CPCB22D11/108B22D11/111
Inventor 刘成宝刘美张炯韩杰张冠峰许荣昌
Owner SHANDONG IRON & STEEL CO LTD
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