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球墨铸铁被广泛作为结构零件的应用,必须有可靠的方法测定其总碳量。呈分散夹杂状的球状石墨在试样中的位置是不规则的,当钻取时它们会从钻屑中和试样表面上碎裂出来,因此现代用于普通铸铁的取样方法是不太可靠的。有人建议在直径20毫米的冷铸模中铸取化学分析试样。但是这种方法仅仅对于铸件检查是可行的而对于铸造的预先分析却没有用。
Ductile iron is widely used as a structural component and must have a reliable method of determining its total carbon content. Spherical graphite in the form of discrete inclusions is irregular in the specimen and will disintegrate from the drill cuttings and from the surface of the test specimen when it is drilled, so modern sampling methods for normal cast iron are less reliable of. It has been suggested to cast chemical analysis coupons in 20 mm diameter chilled molds. However, this method is only feasible for the inspection of castings and is not useful for the preliminary analysis of casting.