H型钢裂纹成因分析

来源期刊：钢铁钒钛2011年第1期

论文作者：王硕明 丁志军 于恒 张彩军

文章页码：89 - 92

关键词：H型钢； 裂纹； 夹杂物； 数学模拟

Key words：H beam steel； crack； inclusion； mathematical simulation

摘    要：研究了某H型钢厂采用半敞开方式浇注的H型钢腹板裂纹产生的原因。在该厂选取了26块有代表性裂纹的试样进行了细致的研究,研究认为:H型钢腹板裂纹主要是由钢中夹杂物因素造成,通过对钢中T[O]的研究发现,中间包T[O]量平均为94×10^-6,铸坯中T[O]平均为60.8×10^-6,同时对比1流铸坯和2流铸坯的T[O]量变化可以发现,中间包流场分布不合理。对该厂现有的中间包进行FLUENT模拟后发现,中间包稳流器矮坝较低,不能完全消除短路流,尤其在浇注后期,矮坝损耗殆尽,基本不起作用,短路流严重,应加以优化。

Abstract: Formation reasons of cracks in H beam steel produced by semi-open way in a large H beam steel factory of Hebei were researched.26 specimens of representative crack in the plant were selected.The study shows that: the crack of stomach plank are mainly caused by inclusions in steel,and T[O] in steel is studied to find that the average T[O] in tundish is 94×10^-6 and the average T[O] in slab is 60.8×10^-6.Meanwhile,in contrast with the T[O] in 1 and 2 strem flow slab,it can be found that flow field distribution of the tundish is not reasonable.The existing tundish in the plant was simulated by FLUENT soft and it was found that the short dam of stabilized is lower in tundish,cannot completely eliminate short circuit flow,especially in the late stage of casting,short dam was used up not to work,and serious short circuit flow should be optimized.