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Solidifying method for bottom pouring type poured steel ingot

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

Active Publication Date: 2016-03-09
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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  • Solidifying method for bottom pouring type poured steel ingot
  • Solidifying method for bottom pouring type poured steel ingot
  • Solidifying method for bottom pouring type poured steel ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Cool the Cr5 steel ingot 1 with a diameter of 220cm and take λ as 0.7. After the casting of the steel ingot 1 starts, six fans with a set speed of 3000r / min are used to blow air to the bottom cast steel ingot 1 to accelerate the cooling. 2 The distance from the outer wall of the steel ingot 1 is maintained at 50 cm and is evenly arranged around the steel ingot 1. The ventilator 2 adopts a tangential circular method to blow and cool the steel ingot 1 for 9.4 hours.

[0050] After the ingot 1 is solidified, a low-magnification inspection is carried out, and it is concluded that the product grade of the ingot 1 is 0.5; the flaw detection is carried out on the ingot 1, and the conclusion is qualified.

Embodiment 2

[0052] Air cooling is performed on the Cr5 steel ingot 1 with a diameter of 200cm, and λ is 0.6. After the casting of the steel ingot 1 starts, six fans with a set speed of 3000r / min are used to blow air to the bottom cast steel ingot 1 to accelerate the cooling. 2 Maintain a vertical distance of 70cm from the steel ingot 1 and evenly arrange it around the steel ingot 1. The ventilator 2 adopts a tangential circular method to blow and cool the steel ingot 1 for 9.3h.

[0053] After the ingot 1 is solidified, a low-magnification inspection is carried out, and it is concluded that the product grade of the ingot 1 is 0.5; the flaw detection is carried out on the ingot 1, and the conclusion is qualified.

Embodiment 3

[0055] Air cooling is performed on Cr5 steel ingot 1 with a diameter of 180cm, and λ is 0.5. After the casting of steel ingot 1 starts, six fans with a set speed of 3000r / min are used to blow air to the bottom casting steel ingot 1 to accelerate cooling. 2 Maintain a vertical distance of 90cm from the steel ingot 1 and evenly arrange it around the steel ingot 1. The ventilator 2 adopts a tangential circular method to blow and cool the steel ingot 1 for 8 hours.

[0056] After the ingot 1 is solidified, a low-magnification inspection is carried out, and it is concluded that the product grade of the ingot 1 is 0.5; the flaw detection is carried out on the ingot 1, and the conclusion is 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 field of steel ingot manufacturing and metallurgical engineering, in particular to a solidification method for bottom casting type cast steel ingots, which is used to improve the degree of element segregation during the solidification of steel ingots. Background technique [0002] The internal defects of large forging steel ingots mainly include segregation, slag inclusions, shrinkage and porosity. The formation of these defects is closely related to the smelting, pouring and solidification process; during the solidification process of large forging ingots, due to the layer-by-layer solidification and shrinkage, The central axis of the steel ingot solidified finally, resulting in shrinkage porosity at the axis of the steel ingot. Due to the selective crystallization in the continuous casting process, the central position is solidified, so the central area has a high content of carbon, phosphorus, sulfur, manganese and other eleme...

Claims

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Application Information

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Patent Type & Authority Applications(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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