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A kind of production method of large thickness large single weight high clean steel

A production method and large unit weight technology, applied in the field of metallurgy, to achieve the effects of optimizing heating and rolling conditions, lower cost, and reducing sulfur content

Active Publication Date: 2018-09-07
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional die-casting production mode is not enough to meet the above-mentioned super-capacity, large-thickness, and single-weight steel plate flaw detection requirements, and it is necessary to optimize the smelting process to improve quality assurance capabilities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The embodiment of the high-clean steel with large thickness and single weight is 220mm thick S550Q steel plate for hydropower units. Slag amount and multiple flow slag, slag amount is 1600kg, slag material is added in small quantities in multiple batches, white slag atmosphere is maintained for 25 minutes, Al in slag 2 o 3 The content of FeO in the slag is 25%, the content of (FeO) in the slag is 10%, the amount of slag remaining at the end of refining is 1000kg, the argon blowing and stirring intensity of the LF furnace is large, the argon flow is large in the first 15 minutes, and the argon flow is appropriately reduced in the next 10 minutes, and the ladle temperature is 1590 Vacuum treatment in the hanging bag VD furnace at ℃, feeding aluminum wire 1.6kg / t molten steel and Si-Ca wire 5.5m / t molten steel into the molten steel during the refining process, and then adding 1.5kg / t steel hydrocarbide deoxidizer, vacuum treatment The hourly vacuum degree is 66Pa, and the...

Embodiment 2

[0033] The embodiment of the high-clean steel with large thickness and single weight is 300mm thick S355J2+N-Z35 steel plate for hydropower units. Its production method includes the following steps: (1) Smelting process: molten steel is first smelted in the primary smelting furnace, and then sent to the LF refining furnace Refining, using increased slag amount and multiple slag flow, slag amount 1600kg, small amount of slag material added in multiple batches, white slag atmosphere kept for 25 minutes, Al in slag 2 o 3 The content of FeO in the slag is 23%, the content of (FeO) in the slag is 11%, the amount of slag remaining at the end of refining is 1000kg, the argon blowing and stirring intensity of the LF furnace is high, the argon flow is large in the first 15 minutes, and the argon flow is appropriately reduced in the next 10 minutes, and the ladle temperature is 1590 Vacuum treatment in the hanging bag VD furnace at ℃, feeding aluminum wire 1.6kg / t molten steel and Si-Ca...

Embodiment 3

[0040] The embodiment of the high-clean steel with large thickness and large unit weight is 360mm thick S355J2+N steel plate for hydropower units. Its production method includes the following steps: (1) Smelting process: molten steel is first smelted in the primary smelting furnace, then sent to the LF refining furnace for refining, Increase the amount of slag and flow slag multiple times, the amount of slag is 1600kg, the slag material is added in small quantities in multiple batches, the white slag atmosphere is kept 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 amount of slag remaining at the end of refining is 1000kg, the argon blowing and stirring intensity of the LF furnace is large, the argon flow is large in the first 15 minutes, and the argon flow is appropriately reduced in the next 10 minutes, and the ladle temperature is 1590 Vacuum treatment in the hanging bag VD furnace at ℃, feedi...

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Abstract

The invention discloses a production method for large-thickness and high-piece-weight high clean steel. The production method comprises a smelting procedure, a casting procedure, a heating procedure, a rolling procedure and a heat treatment procedure. The production method is characterized in that the smelting procedure comprises electric furnace steel making, LF furnace refining and VD furnace vacuum treatment procedure. A steel plate produced by the production method disclosed by the invention has the characteristics of being high in purity, compact in internal structure and the like, and is capable of meeting the requirement of large-thickness and high-piece-weight development of the steel plate, high in comprehensive performance and welding performance, low in cost, and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of high-clean steel with large thickness and single weight. Background technique [0002] In recent years, with the rapid development of the national economic construction, the equipment has shown a trend of large-scale, the demand for high-clean steel with large thickness and single weight has become increasingly prominent, and the market demand for high-clean steel with large thickness and single weight is increasing. The increase in the thickness of a single steel plate will inevitably lead to strict requirements on the internal quality of the steel plate. For a long time, due to the lack of necessary production equipment and technical support, and because there is no domestic mature experience in producing large thickness, large single weight and high clean steel with flat ingots, all of them use electroslag. The cost of ingot production remai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21C7/10C21C7/00C21C7/06
CPCC21C7/0006C21C7/0056C21C7/06C21C7/10C21D8/0226C21D8/0263
Inventor 莫德敏赵文忠邓建军赵红康
Owner WUYANG IRON & STEEL
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