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本文针对武钢轧板厂热轧4C造船钢板低温冲击韧性有时达不到标准要求值这一生产实际问题,研究了控制轧制各主要工艺参数对4C船板铁素体晶粒平均直径的影响及其脆性转化温度与轧后铁素体晶粒平均直径d之间的定量关系.钢板的脆性转化温度越低,表征其抗冷脆性(抗冷脆的能力)就越大.实验结果表明:终轧温度及道次压下率是决定4C船板轧后铁素体晶粒平均直径的主要工艺参数;4C船板的脆性转化温度随d~(-1/2) 值增大而降低,其抗冷脆性及低温冲击韧性随d~(-1/2)值增大而提高.
In view of the fact that the low temperature impact toughness of hot-rolled 4C steel plate of WISCO rolling mill can not reach the required standard value sometimes, the influence of the main process parameters of control rolling on the average ferrite grain diameter of 4C shipbuilding is studied. The brittle transition temperature and the ferrite grain diameter after rolling quantitative relationship between d.The brittle transition temperature of the steel sheet is lower, characterizing its cold embrittlement (cold crisp ability) the greater the experimental results show that: the final The rolling temperature and the pass reduction ratio are the main process parameters that determine the average ferrite grain diameter after 4C ship rolling. The brittle transition temperature of 4C ship plate decreases with the increase of d ~ (-1/2) Cold embrittlement and low temperature impact toughness increased with increasing d ~ (-1/2) value.