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A method for controlling hydrogen in steelmaking

A technology for molten steel and tons of steel, which is used in the improvement of process efficiency, manufacturing converters, etc., and can solve problems such as bubbles, small cracks, and white spots on steel plates.

Inactive Publication Date: 2018-04-06
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high hydrogen content of molten steel without vacuum treatment, it is easy to cause defects such as white spots, hydrogen embrittlement, bubbles and small cracks on the steel plate. In severe cases, it may cause serious quality problems such as delamination of the steel plate, which seriously affects the qualification of the steel plate for flaw detection. Rate

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for controlling hydrogen in steelmaking, comprising the following steps:

[0032] 1) Dry steel scrap, control the water content of the scrap steel to be less than 5%; dry the auxiliary additives required for steelmaking, control the water content of the auxiliary additives to be less than 5%;

[0033] 2) To control the process temperature of converter smelting, the sub-gun TSC measurement temperature is required to be 1590°C to avoid excessive process temperature. After the TSC measurement is completed, no ore is added to cool down, and the CO bubbles generated by the C-O reaction in the later stage of blowing promote the molten steel. Hydrogen discharge;

[0034] Increase the carbon at the end point of the converter to 0.11% to avoid the increase of hydrogen content in molten steel due to end point peroxidation, and at the same time reduce the amount of recarburizer added in the tapping process to avoid hydrogenation of molten steel due to recarburizer;

[00...

Embodiment 2

[0043] 1) Dry steel scrap, control the water content of the scrap steel to be less than 5%; dry the auxiliary additives required for steelmaking, control the water content of the auxiliary additives to be less than 5%;

[0044] 2) To control the process temperature of converter smelting, it is required to measure the temperature of the sub-gun TSC at 1610°C to avoid excessive process temperature. After the TSC measurement is completed, no ore is added to cool down, and the CO bubbles generated by the C-O reaction in the later stage of blowing promote the molten steel. Hydrogen discharge;

[0045] Increase the carbon at the end point of the converter to 0.09% to avoid the increase of hydrogen content in molten steel due to end point peroxidation, and at the same time reduce the amount of recarburizer added in the tapping process to avoid hydrogenation of molten steel due to recarburizer;

[0046] 3) Optimize the amount and sequence of addition of alloy and top slag during tapping...

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Abstract

The invention provides a steelmaking hydrogen control method. Through much test and data analysis, the hydrogen content of molten steel produced in each procedure is detected and analyzed, and the various factors which may increase hydrogen in the steelmaking process are summarized. By optimizing the quality and proportion of furnace charge of a converter, improving the endpoint carbon content of the converter, reducing use of water-containing materials, strictly controlling water leakage of a flue and an oxygen lance, carrying out alloy and protective slag baking, prolonging the slow cooling time of casting blanks and the like, the average hydrogen content in the steel is lowered by 2.04 ppm and becomes 4-6 ppm. The quality of the casting blanks is remarkably improved, the crack and flaw detection defects of the steel grade not subjected to vacuum treatment are greatly reduced, and the flow defection percent of pass of steel plates is improved to 99.3% from original 98.5%.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for controlling hydrogen in steelmaking. Background technique [0002] In the iron and steel metallurgy industry, because some enterprises adopt the production organization mode of double furnace and double machine, but only one RH vacuum treatment equipment, it will inevitably lead to the failure of vacuum treatment for some furnaces of molten steel, resulting in high content of gas inclusions in steel types, among which Hydrogen content has the most obvious influence on the quality of molten steel. Under normal process, the hydrogen content of molten steel without vacuum treatment can reach 7ppm-8ppm, while the hydrogen content of molten steel after vacuum treatment is only 1ppm-2ppm. Due to the high hydrogen content of molten steel that has not been vacuum treated, it is easy to cause defects such as white spots, hydrogen embrittlement, bubbles and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C7/076C21C7/072
CPCC21C5/28C21C7/072C21C7/076Y02P10/20
Inventor 马宝宝于海燕马海涛刘雪丽刘飞许维康闫孝伟
Owner SHANDONG IRON & STEEL CO LTD
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