An anatomical inspection method for quality, structure and performance of 70t to 600t steel ingots

An inspection method and technology of inspection methods, which are applied in the field of performance anatomy inspection, 70-ton to 600-ton steel ingot quality and organization, can solve the problems of large demand for corrosive liquid, large capital investment, and product scrapping, etc., and improve the solidification structure. , Improve the quality of ingots and eliminate casting defects

Active Publication Date: 2011-12-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Higher requirements are put forward for the subsequent forging process and press capacity. Shrinkage cavities are difficult to forge, inclusions exceed the standard, and cracks lead to product scrapping, and the product qualification rate is low.
[0004] In China, in recent years, no company has conducted a complete anatomical analysis of large as-cast steel ingots. Some iron and steel companies only conduct anatomical analysis of the risers and nozzles cut from the forged steel ingots, which cannot accurately capture the parts that seriously affect the quality of the final forging. internal defects
The main reasons for failing to conduct a complete anatomical analysis of large as-cast steel ingots can be summarized as follows: 1) Hundred-ton steel ingots require large capital investment and a long dissection cycle; 2) Hot acid etching low-magnification inspection methods were often used in the past , although the roughness requirements of the inspection surface are low, but the amount of corrosive liquid is large and the corrosion environment is harsh, it is difficult to use it on hundreds of tons of steel ingots; According to the results, it is difficult to store the overall corrosion effect of the 100-ton large inspection surface in this way.
In addition, there were few anatomical analyzes of steel ingots in the past, and the reasons for quality defects inside large steel ingots could not be fully revealed

Method used

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  • An anatomical inspection method for quality, structure and performance of 70t to 600t steel ingots
  • An anatomical inspection method for quality, structure and performance of 70t to 600t steel ingots
  • An anatomical inspection method for quality, structure and performance of 70t to 600t steel ingots

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Experimental program
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Effect test

Embodiment 1

[0046] Anatomical inspection and analysis of 75 tons of steel ingots, the material of the steel ingot is 12Cr2Mo, and the size of the inspection surface is as follows figure 1 As shown, the bottom of the 75t steel ingot is mainly studied, and the specific operation procedures are as follows:

[0047] (1) After the ingot is cast, the surface temperature of the ingot body is demoulded at 880℃. After the ingot is demolded, use The oxygen blowing tube dissected the steel ingot in a height direction. The thickness of the final steel ingot sample is 450mm, which is the central part of the steel ingot. The bottom of the steel ingot is mainly taken. figure 1 Shown. The dissection process ensures that the flatness of the anatomical surface of the steel ingot is 80mm, while ensuring that the cutting heat affected area is less than 70mm, and the surface temperature of the steel ingot is 310°C when the ingot dissection is completed.

[0048] (2) The dissected sample is sent to the heat treatm...

Embodiment 2

[0056] Anatomical inspection and analysis of 120 tons of steel ingots, the material of the steel ingot is 30Cr2Ni4, and the size of the inspection surface is as follows Figure 4 , The specific procedures of the operation are as follows:

[0057] (1) The surface temperature of the ingot body is 900 ℃ when the steel ingot is demolded. The oxygen blowing tube dissected the steel ingot in a height direction. The final thickness of the steel ingot sample is 400mm, which is the central part of the steel ingot. The part of the ingot body with the riser of the steel ingot down 500mm is retained. Figure 4 Shown. The dissection process ensures that the flatness of the anatomical surface of the steel ingot is 60mm, and the cutting heat affected area is less than 50mm. The surface temperature of the steel ingot is 350℃ when the dissection of the steel ingot is completed.

[0058] (2) The dissected sample is sent to the heat treatment furnace at 300°C within 20 minutes, and kept at 300°C fo...

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Abstract

The invention relates to a technology of anatomical analysis and research on a steel ingot of higher than 100-ton grade, particularly to a method for anatomical inspection on the quality, structure and performance of a steel ingot of 70-ton grade to 600-ton grade. The method mainly comprises the steps of: the key position and method for steel ingot anatomy, the heat treatment process for a steel ingot test sample, the surface treatment method for a steel ingot detection area, the high-precision analysis and detection method for sulfur distribution, oxygen distribution and phosphorus distribution, the analysis and inspection method for key area chemical constituents, the method for corroding at different concentrations by different corrosive liquids in different stages according to different types of steel, the post-treatment method for the images and results in the analysis and detection area, the analysis method for macrostructures and metallographic images, etc. With the method disclosed by the invention, the detection area surface of the steel ingot can be enabled to satisfy a cold-acid corrosion inspection demand, the solidification structure and macro-casting defects of a large steel ingot can be observed clearly, and the distribution positions of sulfides, oxides and phosphides as well as the segregation distribution condition of sulfur, phosphorus and carbon elements can be accurately determined, thus providing an advantageous basis for improving the solidification structure and eliminating the casting defects.

Description

Technical field [0001] The invention relates to an anatomical analysis and research technology for steel ingots of 100 tons or more, in particular to an anatomical inspection method for the quality, structure and performance of steel ingots of 70 tons (t) to 600 tons (t). Background technique [0002] Large-scale steel ingots have casting defects such as segregation, cracks, porosity, shrinkage cavities, pores, and non-metallic inclusions, which will seriously affect the quality of the final forgings. The internal structure and casting defects of large steel ingots are studied through anatomical analysis, which has great guiding significance for guiding steelmaking, steel ingot mold design, pouring process parameter optimization, etc. At the same time, it can modify and guide steel ingot thermal field model and casting defect criterion And solute segregation model, thereby significantly improving the internal quality of steel ingots. [0003] In recent years, with the continuous u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/00C21D9/00G01N1/28G01N1/44
CPCC23F1/28
Inventor 刘宏伟盖秀颖傅排先夏立军康秀红李殿中李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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