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Method for measuring nonmetallic inclusion in steel

A technology of non-metallic inclusions and measurement methods, applied in the field of measurement of non-metallic inclusions in steel, can solve problems such as low surface finish, image stability, and inaccurate detection

Inactive Publication Date: 2014-08-27
DONGGUAN KELEE STEEL WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcoming of this prior art is: adopt common metallographic sample, its surface roughness is relatively low, may cause a large amount of inclusions to peel off, or cause serious " trailing " phenomenon and phase boundary unclear, for accurately observing inclusions The distribution, size and shape of the
The disadvantages of this prior art are: 1), the measurement standard adopted is American ASTME768 standard, which is different from the Chinese national standard; 2), because the plasticine is soft and non-rigid, it will have an impact on the stability of the formed image, It is not easy to form a clear and stable image, and it is easy to cause adverse effects such as inaccurate detection; 3). The inclusion analysis software adopts the Inclusion32 inclusion analysis software produced by the American LECO Company, and the microscope adopts the DM4000 semi-automatic microscope produced by the German Leica Company. The object stage adopts the automatic object stage produced by Prior Company in the United Kingdom. The equipment cost is high and cannot meet the needs of most domestic manufacturers; 4) It is only suitable for the detection of inclusions in stainless steel slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The method for measuring non-metallic inclusions in steel of the present invention comprises the following steps: (1) Sampling: intercept the sample along the rolling direction or the stretching direction, so that the polished surface area of ​​the sample is 50mm 2 ;(2) Mounting: Put the intercepted sample flat into the mounting machine, put bakelite powder filler, set the temperature at 130±5°C, close the mounting machine, pressurize and keep warm for 5 minutes to form the sample; (3) Grinding: Grind the inlaid sample on the water-grinding sandpaper of the grinder. The water-grinding sandpaper is ground from coarse (80 mesh) to fine (1500 mesh) water-grinding sandpaper to grind off the deformed layer on the surface of the sample until The surface of the sample is smooth; (4) Polishing: the sample is polished on the polishing cloth of the polishing machine, and the polishing liquid is used for polishing. Make the grinding surface a smooth mirror surface without scratche...

Embodiment 2

[0061] The method for measuring non-metallic inclusions in steel of the present invention comprises the following steps: (1) Sampling: intercept the sample along the rolling direction or the stretching direction, so that the polished surface area of ​​the sample is 54mm 2 ;(2) Mounting: Put the intercepted sample flat into the mounting machine, put bakelite powder filler, set the temperature at 130±5°C, close the mounting machine, pressurize and keep warm for 8 minutes to form the sample; (3) Grinding: Grind the inlaid sample on the water-grinding sandpaper of the grinder. The water-grinding sandpaper is ground from coarse (80 mesh) to fine (1500 mesh) water-grinding sandpaper to grind off the deformed layer on the surface of the sample until The surface of the sample is smooth; (4) Polishing: Polish the sample on the polishing cloth of the polishing machine. Polishing liquid is used for polishing. Make the grinding surface a smooth mirror surface without scratches, and the po...

Embodiment 3

[0063] The method for measuring non-metallic inclusions in steel of the present invention comprises the following steps: (1) Sampling: intercept the sample along the rolling direction or the stretching direction, so that the polished surface area of ​​the sample is 54mm 2 ; (2) Mounting: Put the intercepted sample flat into the mounting machine, put in the electric jade powder filler, set the temperature at 120±5°C, close the mounting machine, pressurize and keep warm for 10 minutes to form the sample; (3 ) Grinding: Grind the inlaid sample on the water-grinding sandpaper of the grinder. The water-grinding sandpaper is ground from coarse (80 mesh) to fine (1500 mesh) water-grinding sandpaper to grind off the deformed layer on the surface of the sample. Until the surface of the sample is smooth; (4) Polishing: Polish the sample on the polishing cloth of the polishing machine, and use polishing liquid for polishing during polishing. , so that the grinding surface becomes a smoot...

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Abstract

The present invention relates to the technical field of measuring non-metallic inclusions, in particular to a method for measuring non-metallic inclusions in steel, comprising the following steps: (1) sampling; (2) inlaying; (3) grinding; (4) polishing; (5) Cleaning; (6) Corrosion; (7) Microscopic metallographic examination. The method for detecting non-metallic inclusions of the present invention has the advantages of simple operation, mature technology and high measurement accuracy of inclusions, and can meet the use requirements of most domestic manufacturers.

Description

technical field [0001] The invention relates to the technical field of measuring non-metallic inclusions, in particular to a method for measuring non-metallic inclusions in steel. Background technique [0002] During the steelmaking process, a small amount of slag, refractory materials and reaction products during smelting may enter molten steel to form non-metallic inclusions. They will reduce the mechanical properties of steel, especially reduce the plasticity, toughness and fatigue limit. In severe cases, they will also cause cracks in the steel during hot working and heat treatment or suddenly brittle fracture during use. Non-metallic inclusions can also promote the formation of hot-processed fibrous and banded structures in steel, making the material anisotropic. In severe cases, the transverse plasticity is only half of the longitudinal plasticity, and the impact toughness of the steel is greatly reduced. Although the content of non-metallic inclusions in steel is sma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88G01N1/28
Inventor 刘金泉
Owner DONGGUAN KELEE STEEL WIRE
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