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一、前言近年来,随着机械加工工业向高速化、精密化和自动化方向发展,对钢材的切削性能要求愈来愈高,易切削钢正是为了适应这种形势发展的需要而出现的新钢种。它是发展农业机械、机器制造和国防工业的重要材料,特别是在拖拉机、汽车制造方面得到广泛的应用。过去由于刘少奇、林彪反革命修正主义路线的干扰,我国的易切削钢生产和科研工作长期不被重视,产量品种不能自给,大量依靠进口。无产阶级文化大革命以来,我国工人、干部和技术人员彻底批判了“洋奴哲学”、“爬行主义”、排除了干扰,发扬了“独立自主、自力更生、艰苦奋斗”的革命精神,使易切削钢的生产和科研工作得到了迅速发展,试制了
I. Introduction In recent years, with the machining industry to the high-speed, precision and automation direction, cutting performance requirements of steel getting higher and higher, free cutting steel is to meet the needs of this situation and the emergence of new Steel species. It is an important material for the development of agricultural machinery, machine building and defense industries. It is widely used in tractors and automobile manufacturing in particular. Due to the interference of Liu Shao-chi and Lin Piao in the course of counter-revolutionary revisionism in the past, the production and scientific research of free-cutting steel in our country has long been neglected. The output of varieties can not be self-sufficient and relies heavily on imports. Since the Great Proletarian Cultural Revolution, our workers, cadres and technicians have thoroughly criticized the “slave-slave philosophy” and “repressionism”, removed the interference and carried forward the revolutionary spirit of “independence, self-reliance and hard work” so that the production of free-cutting steel And scientific research has been rapid development, trial production