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| Analysis of Flange Crack on Hot-Rolled H Section Steel of SS400 |
| WANG Ke-feng1,SONG Jie-zhong2,LI Ming-xian1,HE Li-guo1，ZHAO Rui2 |
1. Quality Division, Rizhao Steel Co., Ltd.， Rizhao 276806, Shandong, China
2. Technology Center, Rizhao Steel Co., Ltd.， Rizhao 276806, Shandong, China |
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Abstract Based on 842 heats of SS400, the flange crack of hot-rolled H section steel of SS400 was analyzed by using optical microscope, scanning electron microscopy and other methods .The results indicated that the blister, edge crack, surface inclusion and skin blowhole are the main factors causing the flange crack defect. The measures for improving H section steel quality were put forward such as controlling chemical compositions and stirring time, increasing the ratio of manganese and sulphur, decreasing inclusions and ensuring adequate tundish baking time, reforming the mould powder, decreasing overheat of tundish, adjusting the process parameters and optimizing the secondary cooling.
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Received: 02 December 2010
Published: 09 October 2011
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2011, Vol. 46 
