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引言1955年6月至10月,我们曾先后在不同的73个熔炼炉号中,分别截取相当于钢锭头部及尾部的试样(即第一根钢轨的头部及第八根钢轨的尾部).作宏观组织检验.结果,因宏观检验不合格者,总数竞达26.75%.其中头部的缺陷占6.00%系严重偏析、缩孔、皮下夹杂,尾部的主要缺陷是皮下气孔占20.75%无疑地,这些缺陷的存在都破坏了钢的连续性.消除这些缺陷,改善重轨钢的宏观组织,是目前重要任务之一.
INTRODUCTION From June to October 1955, we successively cut samples of the head and tail of the ingot in the different 73 melting furnace numbers (ie, the head of the first rail and the tail of the eighth rail ) .The results of macro examination, the total number of competing 26.75% .Among them the head defects accounted for 6.00% serious segregation, shrinkage, subcutaneous inclusions, the main defect is the tail of the subcutaneous stomata accounted for 20.75% Undoubtedly, the existence of these defects undermines the continuity of steel.It is one of the most important tasks to eliminate these defects and improve the macro-organization of heavy rail steel.