在毛主席“独立自主,自力更生”的伟大方针指引下,在无产阶级文化大革命运动的推动下,我厂广大工人、干部和技术人员,坚持为农业服务的社会主义方向,根据兄弟单位的介绍,采用含硼铸铁汽缸套,提高其耐磨性收效良好。从1975年开始,对硼铸铁汽缸套作了工艺试验,9月作了台架试验,初步结果证明: Guided by the great principle of “independence and self-reliance” by Chairman Mao and driven by the Great Proletarian Cultural Revolution, the vast majority of workers, cadres and technicians in our factory adhere to the socialist direction of serving agriculture and, according to the introduction of our fraternal units, Boron-based cast iron cylinder liner to improve its wear resistance with good results. From 1975 onwards, the boron cast iron cylinder liner made a technical test, made a bench test in September, the preliminary results show that: