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根据稀土中锰铁球在冶金矿山生产与使用调查,随机取铁球样品851件,金相分析结果废品率36.4％。其中未球化占9.1％,碳化物量大于20％或形态成条网状占13.9％,索氏体量大于40％占11.9％,奥氏体量大于50％占1.5％,表面质量宏观检查废品率39.4％,以气孔、夹渣、缩孔为主。由此可见,稀土中锰铁球质量控制是一个值得重视的问题。在调查中发现,铁球金相分析废品率,有的单位63.5％,有的单位小于10％,表面质量检查废品率,有的单位77％,有的单位15％,现将废品率低的单位控制质量卓有成效的措施介绍给大家供交流参考。一、未球化或球化不良,解决这个问题主要经验有四点。
According to the investigation of the production and use of rare earth ferromanganese balls in the metallurgical mines, 851 iron ball samples were taken randomly and the rejection rate of the metallographic analysis was 36.4%. Among them, 9.1% of non-spheroidization, more than 20% of carbide or 13.9% of reticular formation, 11.9% of sorbite in more than 40% and 1.5% of austenite in more than 50% Rate of 39.4% to stomatal, slag, shrinkage-based. Thus, the quality control of rare earth manganese iron ball is a problem worth attention. Found in the survey, iron ball metallographic analysis rejection rate, some units 63.5%, and some units less than 10%, the surface quality inspection of scrap, and some units 77%, and some units 15%, now the rate of scrap Unit control measures of effective quality introduced to everyone for reference. First, the non-ball or bad ball, the main experience to solve this problem has four points.