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利用流化床进行钢丝的索氏体化,必须选择适当的流化工艺,使它获得和铅淬火相同的机械性能。本文从钢的索氏体化工艺分析出发,结合钢丝在流化床内冷却的传热特点,得出流化床传热系数和钢丝冷却速度的关系。运用银球试验法测出多种粒子的流化床在不同流化参数下的传热系数,提供生产选用。又实测了钢丝在流化床内的冷却曲线,求得床的传热系数和钢的奥氏体分解温度,其结果与现有资料相符。在半工业性试验炉内对4个钢号11种规格的钢丝进行了生产试验,测定其机械性能和随后拉拨时性能的变化,取得了肯定的结果。
The use of a fluidized bed for the sorbite of wire requires the proper fluidization process to be selected so that it acquires the same mechanical properties as lead quenching. Based on the analysis of the sorbite process, the relationship between the heat transfer coefficient of the fluidized bed and the cooling rate of the steel wire is obtained based on the heat transfer characteristic of the steel wire cooling in the fluidized bed. Silver ball test method is used to measure the heat transfer coefficient of various fluidized bed under different fluidization parameters to provide the production choice. Also measured the cooling curve of the wire in the fluidized bed, get the bed heat transfer coefficient and austenite decomposition temperature, the results consistent with the available data. In a semi-industrial test furnace, four steel grades of eleven kinds of steel wires were subjected to a production test, and their mechanical properties and the subsequent change in pull-out property were measured. Positive results were obtained.