通过对有黑线的中厚钢板进行相关的检验和分析，弄清中厚钢板剪切端面黑线的形成原因。并就黑线对钢板力学性能，焊接性能的影响做了综合分析和评估。
By means of the examination and the analysis on the medium heavy plates with black line,the origin of black line at the cutting end of the medium heavy steel plates are found out. Comprehensive analysis and evaluation of the influence of black line on the mechanical properties and weldablity were carried out.
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