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众所周知,球墨铸铁添加铝(1.0～1.6％Si和0.5～0.9％Al)可以显著提高其冲击韧性、延伸率、耐急冷急热性和抗氧化性。苏联北方管材厂,铸造了重量为1140公斤的上小下无底方形钢锭模(下部尺寸323×323mm)、模壁厚75mm。铸铁中含1.02-1.9％Si和0.44-0.9％Ai。生铁经化铁炉熔化而进行浇注,追加的铝块在出铁过程中加入铁水包中,并同时加入金属镁,铝的回收率达到80-90％。由于加铝使铁水温度平均下降20℃,浇注时铁水温度为1200
As we all know, ductile iron added aluminum (1.0 ~ 1.6% Si and 0.5 ~ 0.9% Al) can significantly improve its impact toughness, elongation, resistance to rapid cooling and oxidation resistance. Northern Soviet Union pipe factory, casting a weight of 1140 kg upper and lower bottomless square steel ingot mold (lower size 323 × 323mm), wall thickness 75mm. Cast iron contains 1.02-1.9% Si and 0.44-0.9% Ai. The pig iron is melted and poured into the iron furnace. The additional aluminum block is added into the ladle in the tapping process, and at the same time the metal magnesium is added and the aluminum recovery rate reaches 80-90%. As Alcan makes the average temperature of hot metal drop 20 ℃, pouring molten iron temperature is 1200