一、攻关前合结钢晶粒度存在的突出问题除本质晶粒度合格率低外,晶粒分布不均以及晶粒粗化温度偏低也是个很突出的问题。我们常发现同一炉钢有的钢棒晶粒度合格,有的钢棒不合格,或初取不合格,重取又合格了。为了查明原因以及较全面地了解 First, the tackle before the junction of the outstanding grain size of the outstanding problems In addition to the nature of grain pass rate is low, the uneven distribution of grain and grain coarsening temperature is also a very prominent issue. We often find that some of the same furnace steel ingot grain size of qualified, and some unqualified steel bars, or unqualified, re-take and passed. In order to find out the reasons and understand more fully