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前言三十年代带钢的退火是在罩式炉中处理的。根据材质、规格和设备水平,热处理周期约需几十至上百小时。由于罩式炉存在着退火质量差、产量低、成本高和操作繁重等一系列缺点,因此到四十年代初就有带钢连续退火炉出现。连续退火的主要优点是:退火时间短(仅以分钟计算),自动化程度高,温度控制精确,可提高产品质量,简化工艺,减少厂房面积和降低生产费用。目前国外较成熟的连续退火炉是塔式炉和卧式炉两种,它们的退火量占镀锡带钢总产量的半数以上。塔式炉和卧式炉虽然具有很大优越性,但也带来一些问题,譬如占据车间空间较大、设备复杂、一次投资大和维护检修困难
Preface The strip annealing in the thirties was done in a hood furnace. According to the material, specifications and equipment levels, heat treatment cycle takes about tens to hundreds of hours. Due to the existence of annealing furnace hood poor quality, low output, high cost and heavy operation and a series of shortcomings, so by the early 1940s there strip continuous annealing furnace. The main advantages of continuous annealing are: a short annealing time (only in minutes), high degree of automation, precise temperature control can improve product quality, simplify processes, reduce plant area and reduce production costs. At present, the more mature continuous annealing furnace abroad is the tower furnace and horizontal furnace two, their annealing accounted for more than half of the total output of tin strip. Although tower furnace and horizontal furnace have great advantages, but also bring some problems, such as occupying a large workshop space, complex equipment, a large investment and maintenance difficulties