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Method for reducing increased nitrogen amount of high-strength steel in converter ladle

A technology for high-strength steel and converter steel, applied in the field of reducing the amount of nitrogen added to high-strength steel in the converter ladle, it can solve the problems of large amount of nitrogen added, reduce the amount of nitrogen added, improve the quality and performance of finished steel, and reduce the nitrogen content of finished products Effect

Inactive Publication Date: 2018-12-21
HANDAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this context, it is necessary to invent an effective method for suppressing the amount of nitrogen added to molten steel in the ladle, so as to solve the shortcomings of high-strength steel smelting in the ladle of the converter process, which has the advantages of low cost and effective control of high-strength steel. Characteristics of Nitrogen Addition in Steel Ladle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1: The method for reducing the nitrogen addition amount of high-strength steel in the converter ladle adopts the following process.

[0010] When smelting high-strength steel 700L steel, take the production data of a pouring 6 heats of steel; the pouring ladle acid melting aluminum is 186ppm, and the ladle temperature is 1580°C; only ferromanganese and aluminum blocks are used for alloying, and used in the alloying process The amount of alloy is 1t electrolytic manganese and 1t medium carbon manganese ferroalloy. The nitrogen content at the end of blowing is 19ppm, the nitrogen content of the ladle sample is 24ppm, and the nitrogen content of the refining incoming sample is 26ppm; it can be seen that the amount of nitrogen added to the molten steel in the ladle is 7ppm.

[0011] Comparative experiment: For the same steel type, the production data of 6 furnaces of steel were taken. The acid-melted aluminum of this pouring ladle was 332ppm, the ladle temperatur...

Embodiment 2

[0012] Embodiment 2: The method for reducing the nitrogen addition amount of high-strength steel in the converter ladle adopts the following process.

[0013] When smelting high-strength steel 980DP, the acid-melted aluminum in the 3 furnaces after pouring is 151ppm, and the temperature of the ladle is 1582°C; only ferromanganese and aluminum blocks are used for alloying, and the amount of alloy used in the alloying process is 2.4t electrolytic manganese and 2.4t Medium carbon ferromanganese alloy. The nitrogen content at the end of blowing is 19.8ppm, the nitrogen content of the ladle sample is 26.3ppm, and the nitrogen content of the refining incoming sample is 27.5ppm; it can be seen that the amount of nitrogen added to the molten steel in the ladle is 7.7ppm.

[0014] Comparative experiment: When smelting high-strength steel 980DP, take a production data of 6 furnaces of steel; the average value of acid-melted aluminum in the 3 furnaces of the first pouring time is 287ppm,...

Embodiment 3

[0015] Embodiment 3: The method for reducing the nitrogen addition amount of high-strength steel in the converter ladle adopts the following process.

[0016] When smelting high-strength steel 600XT, the acid-melted aluminum in the 3 furnaces after pouring is 105ppm, and the temperature of the ladle is 1578.6°C; only ferromanganese and aluminum blocks are used for alloying, and the amount of alloy used in the alloying process is 1.5t electrolytic manganese and 1.5t Medium carbon ferromanganese alloy. The nitrogen content at the end of blowing is 21.5ppm, the nitrogen content of the ladle sample is 25.3ppm, and the nitrogen content of the refining incoming sample is 27.2ppm; it can be seen that the amount of nitrogen added to the molten steel in the ladle is 5.7ppm.

[0017] Comparative experiment: When smelting high-strength steel 600XT, take a production data of 6 furnaces of steel; the average value of acid-melted aluminum in the 3 furnaces of the first pouring time is 359pp...

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Abstract

The invention discloses a method for reducing an increased nitrogen amount of high-strength steel in a converter ladle. The method comprises the steps of: controlling the acid-soluble aluminum of themolten steel in the ladle to 50-200 ppm; controlling the temperature of the molten steel entering the ladle to be 1585+ / -10 DEG C; alloying manganese with medium carbon ferromanganese and electrolyticmanganese. The method reduces the nitrogen content of the high-strength steel product by controlling the acid molten aluminum content of the ladle, the temperature of the ladle and the use amount ofalloy used for replacing or reducing the high nitrogen content, and the quality of the steel is improved while the increased nitrogen amount of the molten steel in the ladle of the converter process is suppressed. The method can effectively reduce the increased nitrogen amount of the molten steel in the ladle of the high-strength steel of the converter process, from the original 15+ / -3ppm to 5+ / -2ppm, thereby improving the quality and performance of the finished steel.

Description

technical field [0001] The invention relates to a tapping alloying method, in particular to a method for reducing the nitrogen addition amount of high-strength steel in a converter ladle. Background technique [0002] With the development of industrial technology, the quality requirements for steel are becoming more and more stringent, especially for the purity of steel. Nitrogen is regarded as an impurity element in most steels. High nitrogen content can cause aging embrittlement of the steel, reduce the impact toughness and weldability of the steel, reduce fatigue resistance, and even deteriorate the surface quality of the product. Advanced pipeline steel X80 High-strength steel such as high-strength automobile girder 700L, high-strength wheel steel HZ540Cl, railway vehicle weathering steel Q450NQR1, and petroleum casing requires that the nitrogen mass fraction be lower than 45×10-6, and measures should be taken to control it in each process of steelmaking. Due to the spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/00
CPCC21C5/28C21C7/0006Y02P10/134
Inventor 朱坦华潘树敏李任春陈军利唐笑宇代红星董进强孟凡雷安世敏
Owner HANDAN IRON & STEEL GROUP
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