为减轻20CrMoH齿轮钢带状组织,进行了Φ80 mm棒材在精轧区的3种穿水冷却试验.结果表明:精轧前穿水冷却,轧制温度处在两相区轧制,带状组织级别为2.5~3.0级;精轧后以及精轧前、后进行穿水冷却,轧制温度处在奥氏体区轧制,带状组织级别为1.0~2.0级,尤其在奥氏体未再结晶区轧制时,带状组织级别为1.0~1.5级.
In order to reduce banded structure of gear steel 20CrMoH,three kinds of through-water cooling experiments on Φ80 mm bars were carried out in finish rolling.The results showed that in the process of through-water cooling before finish rolling,the finish rolling was in the two phase zone,with the banded structure level 2.5-3.0,while in the process of through-water cooling after finish rolling and the process of through-water cooling both before and after finish rolling,the finish rolling was in austenite phase zone,with the banded structure level 1.5-2.0.Especially when finish rolling was in austenite non-recrystallized zone,the banded structure level was 1.0-1.5.
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