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一、前言目前国内生产的化学分析标样均是由冶炼、铸锭、切削加工的方法制成。但在用铸锭法制取高碳铸铁标样时,铁水中的碳往往以石墨形态游离于铁基体中,造成化学成份严重偏析。尽管采取各种措施,铸锭仍会不可避免地出现不均匀性,而且在切削加工过程中,这些游离碳不免会有散落,因此,造成随筛选粒度大小不同,铸铁的含碳量出入很大,即使根据粒
First, the preface At present, the domestic production of chemical analysis standard samples are made by smelting, ingot, cutting method. However, in the preparation of high-carbon cast ingot casting standard sample, the molten iron in carbon graphite often free form in the iron matrix, resulting in serious segregation of chemical composition. In spite of various measures, the ingot inevitably appears uneven, and in the cutting process, these free carbon will inevitably have scattered, resulting in the size of the selected particle size, cast iron carbon content of a great deal Even according to the grain