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LSD钢锭(LSD是法文Lingot á Solidification Dirigèe的缩写,意为“定向凝固钢锭”)与普通钢锭不同之处,在于:高径比小;没有冒口。克鲁索-卢瓦尔工业公司(Creusot-Loire Industrie)用这种钢锭为法马通原子能公司(Framatome)制造了1300MW和1450MW四环道压水堆压力壳封头。这种钢锭有一些优点:1)内部无缺陷性得到了改善;2)成品的化学成分、组织和机械性能的均匀性较好;3)锻造过程得到了简化。这些优点都已经为实验性锻件所验证。本文还对随后工业性生产30个锻件的结果作了分析。
LSD steel ingot (LSD is the abbreviation for the French Lingotá Solidification Dirigèe, meaning “directional solidification steel ingot”) is different from ordinary steel ingot in that: the aspect ratio is small; there is no riser. Creusot-Loire Industrie used this ingot to manufacture 1,300 MW and 1,450 MW four-ring PWR pressure vessel heads for Framatome. This ingot has several advantages: 1) improved internal defect-free properties; 2) better chemical composition, texture and mechanical properties of finished products; and 3) simplified forging process. These advantages have been verified by experimental forgings. The article also analyzes the results of the subsequent industrial production of 30 forgings.