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| Study on Relationship Between Precipitated Phases Containing Ti and Properties of High Strength Hot Strip |
| LI Xinge1，ZHAO Zhiyi1，XUE Rundong1，YANG Xiaozhen2，XIE Jianxin1 |
| 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Baoshan Iron and Steel Co., Ltd., Shanghai 200941, China |
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Abstract The relationship between precipitation of Ti and mechanical properties of hot rolled high strength steel was studied by means of qualitative and quantitative tests, such as tensile test,SEM,TEM and chemical phase analysis. It was found that the strength of the coil middle part is higher than that of the outer part by about 89 MPa. The results of chemical phase analysis indicate that the percentage of precipitated Ti and the proportion of the fine carbonitride precipitates in the coil middle part are higher than that of outer part.For example, the mass percentage of fine precipitates(＜60 nm) is 1.42 times higher than that of outer part. The contribution of carbonitride of Ti smaller than 10 nm to precipitation strengthing in the coil middle part is higher than that of outer part by about 38 MPa. It comes to a conclusion that the unequal Ti precipitation in different parts is the major reason that causes property nonuniformity of steel coil.
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Received: 01 January 1900
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2008, Vol. 43 
