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1985年苏联卡拉干达钢铁公司已采用在罩式炉中将3个25t重的带卷进行再结晶退火的工艺,所制订的两段式加热规程能够生产出硬度达到13345—78“A”级的镀锡原板。但是,在执行新标准13345—85后,原达到的硬度值已不符合新标准规定,因此,必须提高沿带钢长度的硬度均匀性。实际测定表明,退火过程中卷在带卷中心的20～30％长度,即温度最低的部分的硬度最高。试验研究确定,卡拉干达钢铁公司生产
In 1985, Karaganda Steel Company of the Soviet Union has adopted the process of recrystallizing three 25t heavy coils in a hood furnace. The developed two-stage heating procedure can produce a hardness of 13345-78 “A” The original tin plate. However, after the implementation of the new standard 13345-85, the hardness values originally reached have not met the new standard requirements. Therefore, it is necessary to increase the hardness uniformity along the strip length. The actual measurements show that the annealing process in the center of the coil 20 to 30% of the length, the lowest temperature part of the highest hardness. Experimental studies have identified the production of Karaganda Steel Company