這是用廢矽鋼片 生產的 FCD, 史帝田鐵 這麼多, 延伸率不會超過2%. 史帝田鉄的尖角 是延伸率低劣的主因. Steadite is a toughness killer in FCD ductile iron. Its pointed spikes are stress riser and therefore it greatly reduces toughness of ductile iron. How to reduce the amount of steadite? ----Just keep Phosphorus as low as you can and you will avoid this problem.
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