某厂生产的10B21钢防滑链产品抗拉载荷不合格。通过宏观检验、化学成分分析、金相检验、硬度试验和扫描电镜分析等方法对防滑链抗拉载荷不合格原因进行了分析。结果表明：该防滑链含有一定量的硼元素，淬火冷却介质温度偏高使其淬火时冷却速率不足，生成贝氏体组织，最终造成了防滑链抗拉载荷的大幅下降。

Some tire chain products with material of 10B21 steel in a factory failed to pass the tensile test, and the unqualified reasons were analyzed by a series of testing methods including macroscopic examination, chemical composition analysis, metallographic examination, hardness test and SEM analysis. The results show that the tire chains contained a certain amount of boron element. So, if the quench cooling rate was insufficient due to the high temperature of the cooling medium, bainite structures would generate. These bainite structures would lead to a great decline in tensile load of the tire chains.