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Manufacturing method of large-thickness steel plate for ensuring lamellar tearing resistance of core part by continuous casting billet production

A technology of anti-lamellar tearing and manufacturing method, which is applied in the field of metallurgy, can solve problems such as large thickness of steel plates, and achieve the effect of good anti-lamellar tearing performance

Active Publication Date: 2019-06-18
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) The thickness of the steel plate is large, reaching > 80mm ~ 150mm;

Method used

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  • Manufacturing method of large-thickness steel plate for ensuring lamellar tearing resistance of core part by continuous casting billet production
  • Manufacturing method of large-thickness steel plate for ensuring lamellar tearing resistance of core part by continuous casting billet production
  • Manufacturing method of large-thickness steel plate for ensuring lamellar tearing resistance of core part by continuous casting billet production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Steel plate thickness 85mm, width 3200mm, steel type Q500D-Z35.

[0034] In the first step, the thickness of the continuous casting slab is selected to be 370mm.

[0035] The second step is primary smelting. The molten iron is pretreated by KR, and the S content is removed to 0.012%. ] 0.04%, after the molten steel temperature is 1650°C, the steel is tapped into the ladle to enter the molten steel refining process. During the tapping process, 3.2kg / t steel pre-deoxidizer is added to the molten steel, and argon gas is blown in to stir the molten steel.

[0036]The third step is refining, in which white slag is produced in the LF refining process, the total amount of refining agent used is 22kg / t steel, the aluminum wire is fed for precipitation deoxidation, the whole process is sampled to detect the content of molten steel [AL] at 0.012-0.045%, and the total refining time of LF is 52min , after the molten steel temperature is 1660°C, enter the RH vacuum refining process...

Embodiment 2

[0044] The thickness of the steel plate is 102mm, the width is 3200mm, and the steel type is Q500D-Z35.

[0045] In the first step, the thickness of the continuous casting slab is selected to be 450mm.

[0046] The second step is primary smelting. After the molten iron is pretreated by KR and the S content is removed to 0.013%, it enters the 150t BOF top-bottom double-blowing converter for primary smelting. The initial smelting controls the molten steel [P] content to 0.011%, and controls the blowing to stop [C ] 0.05%, after the molten steel temperature is 1670°C, the steel is tapped into the ladle to enter the molten steel refining process. During the tapping process, 3.3kg / t steel pre-deoxidizer is added to the molten steel, and argon gas is blown in to stir the molten steel.

[0047] The third step is refining, in which white slag is produced in the LF refining process, the total amount of refining agent used is 23kg / t steel, the aluminum wire is fed for precipitation deox...

Embodiment 3

[0057] Steel plate thickness 150mm, width 2900mm, steel type Q345D-Z35.

[0058] In the first step, the thickness of the continuous casting slab is selected to be 450mm.

[0059] The second step is primary smelting. The molten iron is pretreated by KR, and the S content is removed to 0.010%. ] 0.04%, after the molten steel temperature is 1660°C, the steel is tapped into the ladle to enter the molten steel refining process. During the tapping process, 3.3kg / t steel pre-deoxidizer is added to the molten steel, and argon gas is blown in to stir the molten steel.

[0060] The third step is refining, in which white slag is produced in the LF refining process, the total amount of refining agent used is 24kg / t steel, the aluminum wire is fed for precipitation deoxidation, the whole process is sampled to detect the content of molten steel [AL] at 0.016-0.052%, and the total refining time of LF is 59min , after the molten steel temperature is 1680°C, enter the RH vacuum refining proce...

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Abstract

The invention relates to a manufacturing method of a large-thickness steel plate for ensuring the lamellar tearing resistance of a core part by continuous casting billet production. The manufacturingmethod comprises the following steps of selecting a continuous casting blank according to the thickness of the steel plate and the grade of the steel type; after the primary smelting of the converter,LF refining and RH vacuum refining processes are strictly controlled to produce high-cleanliness molten steel, then the high-cleanliness molten steel is controlled through a special continuous cast steel process to obtain the continuous casting slab with central loose and center segregation meeting requirements, the steel plate with good anti-lamellar tearing performance is produced through controlled rolling and cooling of the continuous casting slab, and finally the final performance is achieved through heat treatment. The thickness of the steel plate is larger than 80 mm-150 mm, the anti-lamellar tearing performance is excellent, the shrinkage rate of the Z direction (thickness direction) stretching section at a half of thickness is larger than 35%, the steel plate can be widely applied to construction of steel structures such as large bridges and high-rise buildings.

Description

technical field [0001] The invention relates to a method for continuously casting slabs to produce large-thickness steel plates that ensure the lamellar tear resistance of the core. It belongs to the field of metallurgy technology. Background technique [0002] With the increase in the size of steel structures such as high-rise buildings, bridges, hydropower, and ships, the strength and thickness of the steel plates used are getting higher and higher. At the same time, due to the force in the Z direction (thickness direction), the resistance to the steel plates Lamellar tear performance puts forward higher and higher requirements, not only to ensure the Z-direction (thickness direction) tensile section shrinkage at one-quarter of the thickness, but also to ensure the Z-direction (thickness direction) at one-half of the thickness ) The tensile section shrinkage rate should reach >35%. Due to the metallurgical characteristics of the steel itself, for thick steel plates, it...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C5/35C21C7/10C21C7/06C21C7/064B22D11/16C21D1/28C21D1/18B21B1/46
Inventor 李红文白云苗丕峰吴小林叶建军诸建阳马菁
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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