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在铁道部科学技术委员会和工业局的主持下,LD—300K 离子氮化炉鉴定会于1977年12月19日至23日在北京二七机车车辆工厂召开。北京二七机车车辆工厂和铁道部科学研究院金属及化学研究所从
Under the auspices of the Ministry of Railways Science and Technology Commission and the Industrial Bureau, the identification of LD-300K ion nitriding furnace was held December 19, 1977 to December 23 at the Beijing Erqi rolling stock factory. Beijing Erqi locomotive and rolling stock factory and the Institute of Science and Technology Institute of Metals from