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Solidification Method of Bottom-cast Steel Ingot

A bottom pouring and steel ingot technology, which is applied in the field of solidification of bottom pouring cast steel ingots, can solve the problems of segregation of large and high-quality steel ingots, poor solidification quality, and easy to cause waste products, etc., to improve production efficiency, improve solidification quality, and improve elements. The effect of the degree of segregation

Active Publication Date: 2017-09-29
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, among the steel ingots produced by bottom pouring method, due to the limitation of the production method of bottom pouring steel ingots, the bottom pouring steel ingots are solidified, cooled, and demolded under natural conditions after the bottom pouring casting, and element segregation is prone to occur during the solidification process, and the solidification quality is also poor. , especially large and high-quality steel ingots are severely segregated, which is easy to cause waste

Method used

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  • Solidification Method of Bottom-cast Steel Ingot
  • Solidification Method of Bottom-cast Steel Ingot
  • Solidification Method of Bottom-cast Steel Ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The Cr5 steel ingot 1 with a diameter of 220cm is blown and cooled, and λ is 0.7. After the pouring of the steel ingot 1 is started, six fans with a set speed of 3000r / min are used to blow the steel ingot 1 of the bottom pouring type to accelerate cooling. The fan 2. The distance from the outer wall of the steel ingot 1 is kept 50cm and evenly arranged around the steel ingot 1. The fan 2 blows and cools the steel ingot 1 in a circular way for 9.4 hours.

[0050] After the steel ingot 1 was solidified, the low-magnification inspection of the slices was taken, and the product grade of the steel ingot 1 was 0.5; the flaw detection of the steel ingot 1 was carried out, and the conclusion was qualified.

Embodiment 2

[0052] The Cr5 steel ingot 1 with a diameter of 200 cm is blown and cooled, and λ is 0.6. After the pouring of the steel ingot 1 is started, six fans with a set speed of 3000r / min are used to blow the steel ingot 1 of the bottom pouring type to accelerate cooling. The fan The vertical distance between 2 and the steel ingot 1 is kept 70cm and evenly arranged around the steel ingot 1, and the fan 2 adopts a circular cutting method to blow and cool the steel ingot 1 for 9.3h.

[0053] After the steel ingot 1 was solidified, the low-magnification inspection of the slices was taken, and the product grade of the steel ingot 1 was 0.5; the flaw detection of the steel ingot 1 was carried out, and the conclusion was qualified.

Embodiment 3

[0055] The Cr5 steel ingot 1 with a diameter of 180 cm is blown and cooled, and λ is 0.5. After the casting of the steel ingot 1 is started, six blowers with a set speed of 3000r / min are used to blow and cool the bottom poured steel ingot 1 to accelerate cooling. 2. The vertical distance from the steel ingot 1 is kept at 90cm and evenly arranged around the steel ingot 1. The fan 2 blows and cools the steel ingot 1 in a tangential way for 8 hours.

[0056] After the steel ingot 1 was solidified, the low-magnification inspection of the slices was taken, and the product grade of the steel ingot 1 was 0.5; the flaw detection of the steel ingot 1 was carried out, and the conclusion was qualified.

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Abstract

The invention discloses a solidifying method for a bottom pouring type poured steel ingot and belongs to the field of steel ingot manufacturing and metallurgical engineering. The solidifying method for the bottom pouring type poured steel ingot comprises the process of blowing air towards the steel ingot through ventilators to accelerate the cooling process of the steel ingot. The solidifying method is characterized in that the cooling speed of the steel ingot is adjusted by changing the distance between the ventilators and the outer wall of the steel ingot and the rotating speed of the ventilators, and the solidifying time of the steel ingot is made to be shortest according to the formula T=lambda*D2*L / V / 60, wherein T represents the solidifying time of the steel ingot and the unit is h, D represents the average diameter of the steel ingot and the unit is cm, L represents the distance between the ventilators and the outer wall of the steel ingot and the unit is cm, V represents the rotating speed of the ventilators and the unit is r / min, and the value range of lambda is between 0.1-0.7. According to the solidifying method for the bottom pouring type poured steel ingot, solidifying of the steel ingot is accelerated by adjusting the distance for air blowing and cooling of the steel ingot and adjusting the rotating speed of the ventilators, solidifying of the steel ingot is accelerated, the problem of element segregation of the steel ingot is effectively solved, and the solidifying quality of the steel ingot is improved.

Description

technical field [0001] The invention relates to the fields of steel ingot manufacture and metallurgical engineering, in particular to a method for solidifying a bottom poured steel ingot, which is used for improving the element segregation degree in the solidification process of the steel ingot. Background technique [0002] The internal defects of large forging ingots mainly include segregation, slag inclusions, shrinkage cavities and porosity, etc. The formation of these defects is closely related to the process of smelting, pouring and solidification; during the solidification process of large forging ingots, due to layer-by-layer solidification shrinkage, The central axis of the steel ingot solidifies last, resulting in shrinkage porosity at the axis of the steel ingot. Due to the separation and crystallization during the continuous casting process, the central position solidifies later, so the content of carbon, phosphorus, sulfur, manganese and other elements in the cen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/00
CPCB22D23/00
Inventor 郭华楼田兴飞
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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