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A method for detecting inclusions in steel

A detection method and a technology for inclusions, applied in the field of iron and steel smelting, can solve the problems of easy cracks, mechanical properties, and reduced life of steel, and achieve the effect of shortening the time and improving the process

Active Publication Date: 2021-12-31
JINGYE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the size of the inclusions in the steel exceeds a specific size, the steel will be prone to cracks, and its mechanical properties and life will be reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for detecting inclusions in steel, the method steps are:

[0029] Step (1): Sampling and sample preparation

[0030] For the continuous casting slab from the surface to the core, take the surface as a reference to intercept a sample with a length of 200mm, a width of 100mm, and a height of 100mm, remove the surface oxide layer of the steel sample, and polish the surface of the steel sample with sandpaper from coarse to fine, When changing the sandpaper of a specification during the grinding process, pay attention to changing the direction perpendicular to the previous one, clean the surface of the steel sample, and coat the resin adhesive layer; drill a hole in the center of one end of the sample to facilitate installation in the electrolytic cell; electrolyte mass fraction group 8% of tetramethylammonium chloride, 10% of acetylacetone, 6% of FeCl2, 4% of FeSO, 5% of ZnCl2, 0.2% of citric acid, and the rest is distilled water; the target composition of the bill...

Embodiment 2

[0041] A method for detecting inclusions in steel, the method steps are:

[0042] Step (1): Sampling and sample preparation

[0043] For the continuous casting slab from the surface to the core, take the surface as a reference to intercept a sample with a length of 200mm, a width of 100mm, and a height of 100mm, remove the surface oxide layer of the steel sample, and polish the surface of the steel sample with sandpaper from coarse to fine, When changing the sandpaper of a specification during the grinding process, pay attention to changing the direction perpendicular to the previous one, clean the surface of the steel sample, and coat the resin adhesive layer; drill a hole in the center of one end of the sample to facilitate installation in the electrolytic cell; electrolyte mass fraction group 9% tetramethylammonium chloride, 12% acetylacetone, 13% FeCl2, 3% FeSO4, 6% ZnCl2, 0.4% citric acid, and the rest is distilled water; the target composition of the slab is C: 0.02-0.04...

Embodiment 3

[0054] A method for detecting inclusions in steel, the method steps are:

[0055] Step (1): Sampling and sample preparation

[0056] For the continuous casting slab from the surface to the core, take the surface as a reference to intercept a sample with a length of 200mm, a width of 100mm, and a height of 100mm, remove the surface oxide layer of the steel sample, and polish the surface of the steel sample with sandpaper from coarse to fine, When changing the sandpaper of a specification during the grinding process, pay attention to changing the direction perpendicular to the previous one, clean the surface of the steel sample, and coat the resin adhesive layer; drill a hole in the center of one end of the sample to facilitate installation in the electrolytic cell; electrolyte mass fraction group Become tetramethylammonium chloride 8-10%, acetylacetone 10-15%, FeCl2 6-15%, FeSO4 2-4%, ZnCl2 5-8%, citric acid 0.2-0.5%, and the rest is distilled water; Target components are C: 0...

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Abstract

A method for detecting inclusions in steel, the method steps of which are: aiming at continuous casting slab sampling, electrolysis, separation and classification, inclusion fixation and detection, result analysis and process, improving the results obtained by scanning electron microscopy and energy spectrum analysis Combined with the actual process parameters of the production site, it is judged whether the inclusions belong to oxides, silicates, calcium aluminates, sulfides or other forms, and the links that may generate inclusions in the production process are reversed, and then the corresponding links are controlled to reduce inclusions Adverse effects of substances on steel products.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for detecting inclusions in steel. Background technique [0002] The inclusions in the steel are detected by means of microscope, electronic probe and imager analysis. If the quality problem is caused by the inclusions, it can be solved by checking the quality of the slab and improving the smelting process. If the size of the inclusions in the steel exceeds a specific size, the steel will be prone to cracks, and its mechanical properties and life will be reduced. However, some steel products, especially high-clean steel products such as wire rods, deep-drawing materials, IF steel, X120, thermal power generation, hydropower generation, and large castings and forgings, have strict restrictions on the particle size of inclusions. It is easy to improve the process, control it within the allowable value range, and produce qualified products. Con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/2251G01N23/2273G01N23/2202
CPCG01N23/2202G01N23/2251G01N23/2273
Inventor 杨海西史二明刘艳飞刘文平
Owner JINGYE STEEL CO LTD