求翻译：SS400热轧带钢存在力学性能不合格现象，对力学性能不合格的SS400试样进行化学成分、夹杂物、金相组织分析。结果表明：SS400热轧带钢抗拉强度Rm偏低的主要原因有两个，一是Mn含量偏低；二是厚度较大的热轧带钢轧后冷却时，层流冷却能力不足，卷取温度偏高，导致晶粒粗大，最终造成热轧带钢强度不合格。断后伸长率不合格的原因是金相组织中存在严重的魏氏组织，夹杂物的存在也会降低钢材的综合力学性能，提出了解决问题的措施。是什么意思？

The ss400 hot strip of the failure phenomenon of mechanical properties, chemical composition, mechanical properties failed ss400 sample inclusions, microstructure analysis. The results showed that: ss400 tensile strength of hot rolled strip rm low for two main reasons, one mn at low levels; is the t

There are 400 steel with steel SS mechanics are not qualified, and performance of the mechanical properties are not eligible for SS 400 samples for chemical composition, microstructure, and inclusions. Results show that 400 SS Rm rolled low tensile strength with steel are two main reasons for the co

SS400 phenomena of mechanical properties of hot rolled strip is not qualified, unqualified SS400 samples for chemical composition of mechanical properties, inclusions, microstructure analyses. Results showed that the SS400 Rm tensile strength of hot-rolled steel strip there are two main reasons for