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钢丝经过连续炉加热后立即进入铅槽等温淬火,以求获得均勾一致的索氏体组织。长5～7米,温度400～550℃的铅槽表面须覆盖保温材料,其目的是防止热量辐射,隔绝空气和铅液作用,避免铅液氧化。我厂铅槽覆盖料一直是用木炭,在铅槽上覆盖一层100～150mm木炭。连续炉出口处也用木炭封盖。由于接触铅液和900～1000℃钢丝,木炭将很快燃烧,需要经常向木炭层喷水,在喷洒过程中有部分水和铅液接触,铅液温度急剧下降,温度波动影响钢丝等温处理的金相组
Wire through the continuous furnace heated immediately into the lead tank isothermal quenching, in order to obtain uniform hook sorbite. Long 5 to 7 meters, the temperature of 400 ~ 550 ℃ lead trough surface to be covered insulation material, its purpose is to prevent heat radiation, isolated from the air and the role of lead, to avoid lead oxidation. I plant lead tank cover material has been used in charcoal, lead tank covered with a layer of 100 ~ 150mm charcoal. Continuous furnace exit also with charcoal cover. Due to the contact with the lead liquid and 900 ~ 1000 ℃ steel wire, the charcoal will soon burn, you need to spray water regularly to the charcoal layer. Some water and lead liquid come into contact during spraying, the temperature of the lead liquid drops sharply and the temperature fluctuates and affects the isothermal treatment of the steel wire Metallographic group