Based on the quantitative data of internal crack by image recognition system of sulfur print and in the light of internal crack mechanism a statistical analysis for internal crack is made .

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By means of analysis on fissure feature of solvent regeneration tower in sulfur removal and sulfur manufacturing unit of refinery recognized that : this type of fissure was the results of hydrogen induced crack ( HIC ) under wet hydrogen sulfide environment combined with sulfur corrosion .

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According to the character of continuous casting slab and sulfur print examination on the produced slab this paper analyse the formation of the triangle zone crack .

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Because of containing more sulfur and phosphorus in the steel and more carbon high hardness in material of surfacing welding the pinch roller often turns up hot crack .

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Using temperature mold level mold powder steel grades and carbon content sulfur content and phosphorus content of liquid steel it predicts the surface crack of the casting slab .

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