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我厂自72年7月以来,实行稀土镁球墨铸铁包外孕育新工艺,应用地方生铁作原料,已从试验转入稳定生产,各项机械性能指标提高较为显著。如290柴油机曲轴本体性能从60～70kg/mm~2达到80～90kg/mm~2,延伸率从0.8～2%达到2.5～4%,冲击值从0.7～1.2kg-M/cm~2达到2.5～3.5kg-M/cm~2(最高可达6kg-M/cm~2左右)。
Since July 72, our factory has implemented the new technology of producing rare earth magnesium nodular cast iron outside the package. The application of local pig iron as raw material has been transferred from test to stable production. All the mechanical performance indexes have been improved remarkably. Such as 290 diesel engine crankshaft body performance from 60 ~ 70kg / mm ~ 2 to 80 ~ 90kg / mm ~ 2, the elongation from 0.8 ~ 2% to 2.5 ~ 4%, the impact value from 0.7 ~ 1.2kg-M / cm ~ 2 2.5 ~ 3.5kg-M / cm ~ 2 (up to 6kg-M / cm ~ 2 or so).