The reasons of tumbler index decreasing of Shui-Steel sinter since 2007 were analyzed.And the correspond countermeasures were adopted to ensure the sinter strength.

• 从原料结构、操作制度和设备工艺等方面分析水钢2007年以来4号、5号烧结机烧结矿转鼓强度下降的的原因,并介绍了确保烧结矿强度所采取的对策和措施。