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A microalloy steel billet corner transverse crack control technology and crystallizer

A technology for crystallizer and casting billet, which is used in the control process of transverse cracks at the corners of microalloyed steel billets and the field of crystallizers, can solve problems such as imperfections and transverse cracks, achieve uniform cooling speed, prevent damage, and improve solidification efficiency Effect

Active Publication Date: 2021-02-05
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the existing problems of transverse cracks in the corners of micro-alloy steel continuous casting slabs and no perfect solutions, the present invention provides a technology for controlling transverse cracks in the corners of micro-alloy steel casting slabs. Continuous casting of microalloy slabs by means of a combination of secondary cooling, uniform weak cooling, and reduction of additional stress on the slab can greatly reduce or even eliminate corner transverse cracks in microalloy steel continuous casting slabs, and greatly improve the microalloy slab. Alloy Steel Continuous Casting Slab Quality and Production Efficiency, Cost Savings

Method used

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  • A microalloy steel billet corner transverse crack control technology and crystallizer
  • A microalloy steel billet corner transverse crack control technology and crystallizer
  • A microalloy steel billet corner transverse crack control technology and crystallizer

Examples

Experimental program
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Effect test

Embodiment 1

[0045] like figure 1 and figure 2 As shown, a crystallizer is mainly used to cool the high-temperature liquid steel coming out of the tundish, so that the molten steel can be quickly solidified into a billet shell with a certain thickness around it, but the incompletely solidified billet is still liquid steel inside, and then successively After passing through the secondary cooling zone and the air cooling zone at the lower mouth of the crystallizer, until it is completely solidified into a billet of a certain shape. The specific structure of the crystallizer is described in detail below.

[0046] The crystallizer mainly includes a frame 1 and a wide water tank 2 and a narrow water tank 3 installed vertically on the frame 1. The wide water tank 2 and the narrow water tank 3 are used to provide cooling water to cool molten steel. Wherein, there are two wide-faced water tanks 2, which are arranged symmetrically inside the crystallizer, and a wide-faced copper plate 4 is insta...

Embodiment 2

[0055] A technology for controlling transverse cracks at the corners of microalloy steel slabs, using a crystallizer in Example 1 to produce continuous casting slabs, the main target is continuous casting slabs with a thickness between 210mm and 250mm, including the following step:

[0056] 1. Strong cooling of crystallizer

[0057] Control the cooling water volume of the wide surface of the crystallizer to 4050-4500L / min, and the water volume of the narrow surface to 430-540L / min. The water volume of the wide surface and the narrow surface is set in conjunction with the improved copper plate structure to carry out strong cooling of the molten steel. , in this parameter range. Production of slabs, especially slabs with a thickness ranging from 210mm to 250mm, can greatly improve the solidification efficiency of molten steel in the crystallizer and the high-temperature mechanical properties of the slab shell.

[0058] The reverse taper value of the control mold is 1% to 1.2%....

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Abstract

The invention discloses a micro-alloy steel billet corner transverse crack control process and crystallizer, belonging to the technical field of slab continuous casting. The crystallizer includes a frame and a wide-faced water tank and a narrow-faced water tank installed on the frame. A wide-faced copper plate is installed on the wide-faced water tank. A narrow-faced copper plate is installed on the described narrow-faced water tank. The wide-faced copper plate There are a plurality of wide surface water grooves extending along the length direction of the wide surface copper plate, and the narrow surface copper plate has a plurality of narrow surface water grooves extending along the length direction of the narrow surface copper plate. By improving the structure of the copper plate, it can effectively Controlling the generation of transverse cracks at the corners of micro-alloy steel continuous casting slabs improves product quality and production efficiency. The process combines the strong cooling of the crystallizer, the uniform weak cooling of the secondary cooling and the reduction of the extra stress on the slab for continuous casting production, which can greatly reduce or even eliminate the transverse cracks at the corners of the microalloy steel continuous casting slab , greatly improving the quality and production efficiency of micro-alloy steel continuous casting slabs, and saving costs.

Description

technical field [0001] The invention belongs to the technical field of continuous casting of slabs, and more specifically relates to a technology for controlling transverse cracks at corners of microalloy steel billets and a crystallizer. Background technique [0002] Microalloyed steel refers to steel with carbon content of 0.06% to 0.25%, manganese content ≥ 1.0%, and added microalloy elements such as Nb, V, Ti, Cu, and P. The existence of these microalloying elements can greatly improve the strength and toughness index of steel through mechanisms such as grain refinement, solid solution strengthening, precipitation strengthening, and dislocation strengthening, so as to realize the lightweight design of steel, which meets the requirements of energy saving, emission reduction, and low-carbon economy. Therefore, in recent years, the development and application of microalloyed steels have been vigorously developed and made great progress. [0003] However, the addition of mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/055B22D11/111B22D11/22B22D11/20
CPCB22D11/055B22D11/111B22D11/20B22D11/22
Inventor 刘启龙朱伦才王志政曹成虎张文全谢欣荣张敏
Owner MAANSHAN IRON & STEEL CO LTD
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