本文主要研究超低碳钢初期状态对头坯质量的影响。
The paper mainly study effect on head slab quality of ultra-low carbon steel of first state.
首次选取泰勒级数的部分二次项，用一个距原点最近点处拟合的超低维曲面近似极限状态面。
Firstly part of quadratic term of Taylor series is chosen; a low-dimension surface is used to approximate limit state surface; and the modified reliability formula is derived.
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