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一九七六年五月,我们接受了一批可锻铸铁扇形齿轮板的生产任务,要求牌号KT35-10,委托单位要求尽快交货。我们综合了国内外的经验,结合生产条件采取了几个方面的措施,使退火周期缩短到10.5～13.5小时,铸件机械性能达到和超过了KT35-10牌号要求。现将采取的措施和试验情况叙述如下: (一)稳定基本元素(C、Si、Mn、S、P、Cr)的含量。并在适当降低含碳量(控制在2.5％左右)的基础上,提高硅的含量(控制在1.5～1.7％)。并注意降低磷、铬的含量和适当的锰硫比值。我厂生产的可锻铸铁原铁水化学成份为:2.4～2.6％C,1.5～1.7％Si,0.4～0.6％Mn,0.10～0.15％S,<0.07％P,<0.05％Cr。根据我们的生产经验和体会,认为可锻铸铁硅的含量主要决定于和碳在
In May 1976, we accepted a batch of malleable cast iron sector gear plate production tasks, requiring grade KT35-10, commissioned by the unit as soon as possible delivery. We have a combination of domestic and foreign experience, combined with the production conditions to take several measures to shorten the annealing cycle 10.5 to 13.5 hours, casting mechanical properties meet and exceed the KT35-10 grade requirements. The measures and experimental conditions to be taken are as follows: (1) The content of stable basic elements (C, Si, Mn, S, P and Cr). And in the appropriate reduction of carbon content (controlled at 2.5%) based on the increase of silicon content (control in 1.5 to 1.7%). And pay attention to reduce phosphorus, chromium content and the appropriate ratio of manganese and sulfur. The chemical compositions of the malleable cast iron from our factory are as follows: 2.4-2.6% C, 1.5-1.7% Si, 0.4-0.6% Mn, 0.10-0.15% S, <0.07% P, <0.05% Cr. According to our production experience and experience that the content of malleable iron is mainly determined by the silicon and carbon in