发明名称 |
A METHOD OF PRODUCING A ROLLED H-SHAPED STEEL HAVING UNIFORM MICROSTRUCTURE AND UNIFORM MECHANICAL PROPERTIES |
摘要 |
<p>The present invention relates to an H-section used as a member for building structures, and in particular, is a rolled H-section having uniform microstructures and uniform mechanical properties, and a method of producing the same, characterized in that: the microstructures satisfy any one or more of the following conditions on the basis of a 1/4 flange portion in a cross section of said H-section: 1) the deviations of the average grain sizes of ferrite in the microstructures of a 1/2 flange portion and a fillet portion from that of the 1/4 flange portion are within +/- 15% thereof, 2) the deviation of the average grain size of ferrite in the microstructure of a 1/2 web portion from that of the 1/4 flange portion is within +/- 15% thereof, 3) the deviations of the average rates of pearlite in the microstructures of a 1/2 flange portion and the fillet portion from that of the 1/4 flange portion are within +/- 8% thereof, and 4) the deviation of the average rate of pearlite in the microstructure of a 1/2 web portion from that of the 1/4 flange portion is within +/- 8% thereof. <IMAGE></p> |
申请公布号 |
EP1281777(A1) |
申请公布日期 |
2003.02.05 |
申请号 |
EP20010919779 |
申请日期 |
2001.04.04 |
申请人 |
NIPPON STEEL CORPORATION |
发明人 |
YOSHIDA, SUGURU;SATOH, HIRONORI;YAMAMOTO, TAKESHI;SAIKI, EIJI;KUROKAWA, MASAO |
分类号 |
B21B1/08;C21D8/00;C21D9/00;C22C38/12;(IPC1-7):C21D8/00;C22C38/00 |
主分类号 |
B21B1/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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