Heavy reduction technology for improving center segregation and center porosity of super-thick slabs

A technology of loose center and extra-thick slab, which is applied in the field of continuous casting slab reduction, which can solve the problems of reduced welding performance, difficult welding of steel plates, cracking, etc., and achieve the effect of improving quality

Active Publication Date: 2014-06-04
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, for natural gas pipeline steel, the hydrogen in the transport gas will diffuse to the segregation or porosity of the pipe wall to generate cracks and expand, eventually causing the steel pipe to rupture; for structural steel used in offshore drilling platforms, central segregation or porosity will reduce its welding performance , causing the steel plate to be difficult to weld, or even cracked after welding, thus greatly shortening the service life of the steel

Method used

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  • Heavy reduction technology for improving center segregation and center porosity of super-thick slabs
  • Heavy reduction technology for improving center segregation and center porosity of super-thick slabs
  • Heavy reduction technology for improving center segregation and center porosity of super-thick slabs

Examples

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Effect test

Embodiment 1

[0020] Implementation example 1: Steel grade Q345D, billet thickness 300mm, width 2270mm, detected superheat 35°C, drawing speed 1.0m / min, specific water volume in the secondary cooling zone 0.4L / kg. The implementation of large reduction is the 9th sector 3, the reduction is 5.0mm, the 10th sector 4 and the 11th sector 5 are both 3mm, and the 9th sector 3 cylinder pressure is 1800KN.

[0021] Implementation effect: After low magnification inspection, the center segregation is C1.0, and the center is loose C1.0, and no intermediate cracks appear. See you in low magnification photos image 3 .

Embodiment 2

[0022] Implementation Example 2: Steel grade Q345R, billet thickness 360mm, width 2070mm, detection superheat 25, ℃ pulling speed 0.8m / min, specific water volume of the second cold zone is 0.5L / kg. The implementation of large reduction is the 11th sector 5, the reduction is 9mm, the 9th sector and the 10th sector are both 2.5mm, and the 11th sector cylinder pressure is 2000KN.

[0023] Implementation effect: After low magnification inspection, the center segregation of the cast slab is C0.5, the center is loose C0.5, and no intermediate cracks appear. See you in low magnification photos Figure 4 .

Embodiment 3

[0024] Implementation Example 3: Steel grade EH36, slab thickness 420mm, width 2070mm, detection superheating degree 10℃, drawing speed 0.6m / min, specific water volume of secondary cooling zone 0.6L / kg. Implementation of large reduction is the 10th sector 4, the reduction is 12mm, the 9th sector 3 and the 11th sector 5 are both 2mm, and the 10th sector 4 has a pressure of 2500KN.

[0025] Implementation effect: After low magnification inspection, the center segregation of the cast slab is C0.5, the center is loose C0.5, and no intermediate cracks appear. See you in low magnification photos Figure 5 .

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Abstract

The invention discloses a heavy reduction technology for improving center segregation and center porosity of super-thick slabs. The heavy reduction technology is characterized in that the oil cylinder pressure of hydraulic cylinders on three sectorial sections of solidification tail ends of the continuous casting slabs ranges from 1800KN to 2500KN; and according to the solidification characteristics of steel types, the superheat degree of molten steel is controlled between 10-35 DEG C, the casting speed of a casting machine is controlled between 0.6 meter / minute and 1.0 meter / minute, the specific water flow of a secondary cooling zone is controlled between 0.4 and 0.6 liter / kilogram, large pressure is applied to one sectorial section to achieve the reduction of 5.0-12.0 millimeters, and the other two sectorial sections are slightly pressed to achieve reductions of 2-3 millimeters. The heavy reduction technology can be implemented to improve the quality of the super-thick slabs which further can be used for substituting for static ingots to produce super-thick steel plates with the thickness of 100millimeters and more, and the heavy reduction technology can achieve the high production efficiency and is environment-friendly.

Description

Technical field [0001] The invention relates to a continuous casting slab reduction technology, in particular to a large reduction method for improving the center segregation and center looseness of an extra-thick slab with a thickness of 300-420 mm. Background technique [0002] Since the beginning of the new century, due to scientific and technological progress and economic development, there has been an increasing demand for extra-thick steel plates over 100mm at home and abroad. Some steel companies have successively built or planned to build special thick steel plate production equipment. The main equipment for the production of extra-thick steel plates includes smelting equipment, continuous casting equipment and wide-thick steel plate rolling equipment. The billets used for rolling extra-thick plates are die-cast steel ingots or continuous casting slabs. The thickness of the continuous casting slabs that can be stably produced in our country is basically below 300mm, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/16B22D11/12
Inventor 赵和明廖彬生余小琴赵敏森付军王国文钟巍邹锦忠帅勇谢桂强孙乐飞杨帆
Owner 新余钢铁股份有限公司
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