Production method for improving flaw detection qualified rate of ultra-wide single-weight microalloyed steel plate

A technology of micro-alloying and production methods, applied in the field of metallurgy, can solve problems such as edge flaw detection inconsistencies, and achieve the effects of compact internal quality, broad application prospects, and low cost

Inactive Publication Date: 2020-04-21
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Wuyang Iron and Steel Company has a 4200mm rolling mill, and the rolling width of steel plates with a width of 3900-4000mm has reached the limit width of the rolling mill, which can easily cause flaw detection at the edge. The traditional die-casting production mode cannot meet the above-mentioned ultra-wide single-weight microalloyed steel plate flaw detection requirements. It is necessary to optimize the smelting and rolling process to improve quality and ensure production capacity

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] The present embodiment steel plate is SA516Gr70, and thickness and width are 200mm, and width is 3950mm, and the production method that improves steel plate flaw detection qualification rate comprises the following steps:

[0026] (1) Smelting process: The molten steel is first smelted in the primary smelting furnace, and then sent to the LF refining furnace for refining. The amount of slag is increased and the slag is flowed multiple times. During the refining process, the aluminum wire of 1.6kg / t molten steel and 5m / t Add 1.5kg / t of calcium carbide deoxidizer to the pure Ca wire with a molten steel diameter of 11mm, control the amount of slag at 15.8kg / t of molten steel, add a small amount of slag in multiple batches, keep the white slag atmosphere for 25 minutes, and the Al in the slag 2 o 3 The content of FeO in the slag is 25%, the content of FeO in the slag is 10%, the intensity of argon blowing and stirring in the LF furnace, the flow rate of the large argon gas ...

Embodiment 2

[0034] The present embodiment steel plate is Q345R, and thickness and width are 190mm, and width is 3900mm, and the production method that improves steel plate flaw detection qualification rate comprises the following steps:

[0035](1) Smelting process: The molten steel is first smelted in the primary smelting furnace, and then sent to the LF refining furnace for refining. The amount of slag is increased and the slag is flowed multiple times. During the refining process, the aluminum wire of 1.7kg / t molten steel and 5.5m / t tThe pure Ca wire with a diameter of 11mm in molten steel is added with 1.6kg / t of calcium carbide deoxidizer, the amount of slag is controlled at 16kg / t of molten steel, the slag is added in small quantities in multiple batches, the white slag atmosphere is kept for 28min, and the Al in the slag 2 o 3 The content of FeO in the slag is 23%, the FeO content in the slag is 11%, the intensity of argon blowing and stirring in the LF furnace, the flow rate of th...

Embodiment 3

[0043] The present embodiment steel plate is SA516Gr65, and thickness and width are 210mm, and width is 4000mm, and the production method that improves steel plate flaw detection qualification rate comprises the following steps:

[0044] (1) Smelting process: The molten steel is first smelted in the primary smelting furnace, and then sent to the LF refining furnace for refining. The amount of slag is increased and the slag is flowed multiple times. During the refining process, the aluminum wire of 1.55kg / t molten steel and 6.0m / t tThe pure Ca wire with a molten steel diameter of 11mm is added with 1.8kg / t of calcium carbide deoxidizer, the amount of slag is controlled at 16.1kg / t of molten steel, a small amount of slag is added in multiple batches, the white slag atmosphere is kept for 26 minutes, and the Al in the slag 2 o 3 The FeO content in the slag is 28%, the FeO content in the slag is 12%, the argon blowing and stirring intensity of the LF furnace, the large argon flow ...

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Abstract

The invention discloses a method for improving the flaw detection qualified rate of an ultra-wide single-weight microalloyed steel plate. The production method comprises the following steps: smeltingmolten steel in an electric furnace, refining in an LF refining furnace, carrying out vacuum treatment in a vacuum furnace, carrying out die casting on the molten steel after smelting by adopting a flat steel ingot, carrying out heating, rolling and heat treatment on the steel ingot in a soaking furnace, carrying out flaw detection, and finally obtaining a finished steel plate. According to the method, the process idea of clean steel is adopted, the purity of the molten steel is improved, the sulfur content is reduced, Ca treatment is carried out, the heating and rolling process of the flat steel ingot is optimized, the characteristics of high purity, compact internal quality and the like are achieved, and the width of the obtained ultra-wide single-weight microalloyed steel plate is 3850-4000 mm with a single weight of 15-35t, and the qualified rate of flaw detection is 100%; the averaged transverse impact work of the steel plate at minus 30 DEG C is 180-220J, Z-direction performanceis 55-75%, good comprehensive performance and welding performance are achieved, cost is low, and the application prospects are wide.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method for improving the qualified rate of flaw detection of ultra-wide and large single-weight microalloyed steel plates. Background technique [0002] In recent years, with the rapid development of the national economic construction, the equipment has shown a trend of large-scale, and the demand for improving the pass rate of ultra-wide and single-weight micro-alloyed steel plates has become increasingly prominent. The demand for high efficiency is increasing, and the increase in steel plate width and unit weight will inevitably lead to strict requirements on the internal quality of steel plates. For a long time, due to the lack of necessary production equipment and technical support, and because domestic production of flat ingots has not been used to increase ultra-wide and large unit weight. The mature experience of flaw detection pass rate of alloye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/072C21C7/10C21D8/02C21D1/28B22D37/00B22D27/20B22D27/04
CPCB22D27/04B22D27/20B22D37/00C21C7/0056C21C7/06C21C7/072C21C7/10C21D1/28C21D8/0205C21D8/0221C21D8/0247
Inventor 邓建军李建朝莫德敏李杰龙杰庞辉勇张晨光王九清付东阳董亚楠付振坡赵喜伟袁平赵燕青杨浩张俊凯吴峰茂王少义鲁赛钢
Owner WUYANG IRON & STEEL
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