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FCD 鑄鐵的金相內最怕有"史帝田鐵 (S) " 出現, 因為此組織的尖銳犄角會提昇應力(stress raiser) , 為潛在的破裂起源點(crack initiation sites). S越多 破裂的機率也就越高. 此物為鐵水含磷(P)所引起, 故FCD鐵水中, P 越低越好. The most undesirable structure in ductile irons is Steadite. Sharp, pointed spikes of Steadite are sites of stress concentration, and thus sites for crack initiation.
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