先把低碳低矽的鑄鉄水, 倒成"口白鑄鉄". 然後實施"石墨化退火", 將共晶碳化物分解即得可鍛鑄鉄. Malleable iron is cast as White iron----- a metastable carbide (called Cementite) in a pearlitic matrix. Through an annealing heat treatment (high temp + long holding time) the Carbide is transformed: Carbon agglomerates into small aggregates of graphite, leaving a matrix of ferrite + pearlite, according to the exact heat history it goes thru.
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