Examination method for determining position of subsurface inclusion defect of continuous casting billet
A technology of defect location and inspection method, which is applied to determine the position of subcutaneous inclusion defects in continuous casting slabs in the low-magnification structure of casting slabs. In the field of material inspection, it can solve the problem of inability to determine the relationship between defects and solidification structures, and the inability to accurately locate subcutaneous inclusion defects. and other issues to achieve the effect of fast inspection speed, low pollution, and energy saving
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Embodiment 1
[0021] Example 1, test and determine the position of the subcutaneous inclusion defect of the continuous casting slab whose chemical composition is C 0.14wt%; Si 0.5wt%; Mn 0.9wt%; P 0.035wt%; S 0.035wt%; Al 0.015wt%.
[0022] Take the cross-sectional sample of continuous casting billet of this composition, first face mill and grind the sample to achieve a surface finish of Ra≤0.1μm, and then mechanically polish until the surface finish reaches Ra≤0.025μm.
[0023] With the slab sample facing up, use the cold acid etching reagent involved in the present invention to corrode the sample surface for about 0.5-1 minute, and when the surface of the slab sample is observed with the naked eye to show a solidified crystalline structure, Pour hot water above 80°C on the corrosion test surface for 0.5 minutes, and dry it with high-pressure air. At this time, subcutaneous inclusion defects are faintly displayed.
[0024] Heat the 1:1 hydrochloric acid aqueous solution to 60-70°C, place ...
Embodiment 2
[0025] Example 2, the chemical composition is determined to be the position of the subcutaneous inclusion defect of the continuous casting slab containing C 0.17wt%; Si 0.48wt%; Mn 0.8wt%; P 0.029wt%; S 0.035wt%; Al 0.015wt%.
[0026] Take the cross-sectional sample of continuous casting billet of this composition, first face mill and grind the sample to achieve a surface finish of Ra≤0.1μm, and then mechanically polish until the surface finish reaches Ra≤0.025μm.
[0027] With the slab sample facing up, use the cold acid etching reagent involved in the present invention to corrode the sample surface for about 0.5-1 minute, and when the surface of the slab sample is observed with the naked eye to show a solidified crystalline structure, Pour hot water above 80°C on the corrosion test surface for 0.5 minutes, and dry it with high-pressure air. At this time, subcutaneous inclusion defects are faintly displayed.
[0028] Heat the 1:1 hydrochloric acid aqueous solution to 60-70°C...
Embodiment 3
[0030] The inspection determined that the chemical composition was the position of the subcutaneous inclusion defect of the continuous casting slab containing C 0.18wt%; Si 0.41wt%; Mn 0.85wt%; P 0.033wt%; 0.036wt%; Al 0.016wt%.
[0031] Take the cross-sectional sample of continuous casting billet of this composition, first face mill and grind the sample to achieve a surface finish of Ra≤0.1μm, and then mechanically polish until the surface finish reaches Ra≤0.025μm.
[0032]With the slab sample facing up, use the cold acid etching reagent involved in the present invention to corrode the sample surface for about 0.5-1 minute, and when the surface of the slab sample is observed with the naked eye to show a solidified crystalline structure, Pour hot water above 80°C on the corrosion test surface for 0.5 minutes, and dry it with high-pressure air. At this time, subcutaneous inclusion defects are faintly displayed.
[0033] Heat the 1:1 hydrochloric acid aqueous solution to 60-70...
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