一、国内淬火油现状第二次世界大战以后,工业发达国家开始着手对矿物油制品的研究。试图用矿物油来代替以前的动植物油淬火。一般来说,到60年代都已完成这项工作。在我国第一个五年计划期间,苏联在援建我国156项重点 First, the status quo of domestic quenching oil After the Second World War, industrialized countries started to study the mineral oil products. Try to use mineral oil instead of the previous animal and vegetable oil quenching. In general, this work has been completed by the 1960s. During the first five-year plan of our country, the Soviet Union assisted in setting up 156 key points in our country