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A D2 tool steel ingot slightly forged sold to tool makers by a Mr. Smart who thought he could make much more profit than selling a steel that was sufficiently forged. It looks like an act of cheating.
以暗視場照明攝, 白變黑. 黑色部份為共晶碳化物, 為凝固組織, 未被打散. 韌性會很差. 只能用在負載不大 只要耐磨的地方.例如 木工機機台面.
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