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可锻铸铁退火时间较长,一般应由控制铸铁化学成分、改进孕育处理和铸造工艺、改善退火设备等措施,以缩短周期。我厂生产的KT35-10可锻铸铁扇形齿轮板,按老工艺退火周期66～72小时,我们采取了一系列措施,使退火周期需缩短到10.5～12小时。一、生产工艺 1.控制化学成分适当降低含碳量,提高含硅量,并注意降低磷、铬的含量和合适的锰硫比值。所采用的化学成分为:C 2.4～2.5%、Si 1.5～1.7%、Mn 0.4～0.6%,S 0.10～0.15%、P<0.07%、Cr<0.05%。 2.用稀土合金进行复合孕育处理用稀土-铝-铋复合孕育剂进行处理,以细化初晶组织,加速石墨化过程,并可提高铸件机
Malleable cast iron annealing time longer, generally by controlling the chemical composition of cast iron, to improve the handling and casting process, to improve the annealing equipment and other measures to shorten the cycle. I plant the KT35-10 malleable cast iron sector gear plate, according to the old process annealing cycle 66 to 72 hours, we have taken a series of measures to shorten the annealing cycle to 10.5 to 12 hours. First, the production process 1. Control the chemical composition appropriate to reduce the carbon content, increase the silicon content, and pay attention to reduce the phosphorus and chromium content and the appropriate ratio of manganese and sulfur. The chemical compositions used are: C 2.4-2.5%, Si 1.5-1.7%, Mn 0.4-0.6%, S 0.10-0.15%, P <0.07%, Cr <0.05%. 2. With rare earth alloy compound inoculation treatment Rare earth - aluminum - bismuth compound inoculant for processing, to refine the primary crystal structure, accelerate the graphitization process, and can improve the casting machine