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~ DC53, 但另加 0.70%?Al (鋁), 熔煉管控不好時, 鋼鉄基地內 會有許多灰色的 AlN 氮化鋁 (陶瓷,不導電)顆粒 , EDM線割時如果遇到此顆粒, 線會轉彎(尺寸失準)或扯斷, 所以要線割的模具, 選料時要考慮此點. Below: AlN particles (grey) is ceramic, electrically non-conductive, acts as blocking stone in the path of wire EDM, causing wire to de-tour. 
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