我所于1951年底,开始进行纯镁加入方法制造球墨铸铁的研究,在1952年1月初,曾作实地试验:制造的方法是用两端封闭的直径75公厘的石墨管,下端钻有3公厘的小孔4~6个,管内装12．5~15．0公厘大小的镁块,压入铁水内,经三次试验后,发现因管壁过厚,管内发生的镁蒸汽压力小于铁水的压力,所以镁蒸汽不能进入铁水,若将管壁减薄,则强度不够。 At the end of 1951, I started to study the method of adding pure magnesium to make ductile iron. In early January 1952, I conducted a field test. The manufacturing method was to use a 75-centimeter-diameter graphite tube closed at both ends and a 3 4 to 6 mm holes, the tube containing 12.5 to 15.0 mm size magnesium block, pressed into the molten iron, after three tests, found that due to the tube wall is too thick, the magnesium vapor pressure in the tube is less than Hot metal pressure, so magnesium steam can not enter the hot metal, if the wall thinning, the strength is not enough.