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前言第一、二炼钢厂在浇铸镇静钢时,模(帽)内钢液曾不时出现程度不同的沸腾现象。一炼钢厂1972年2月制定的《优质钢验收制度》规定“浇铸过程中,在模内、帽内有明显沸腾现象者改为普通钢种,沸腾严重者作废”。1977年10月公司对这一判废条款又作了说明:“模内沸腾严重将保护渣卷入作废”。执行这些规宅以来,1972～1978年期间,一炼钢厂每年平均报废钢锭达1357吨(其中帽内沸腾废1008吨,模内沸腾废349吨),二炼钢厂近年来也时有报废。判废的钢锭,就锭型言,有上大下小带
Preface The first and second steel mills in the casting of cast steel, mold (cap) liquid steel from time to time there have been different degrees of boiling phenomenon. A steel mill in February 1972 developed the “quality steel acceptance system” provides that “in the casting process, in the mold, the cap has obvious boiling phenomenon to ordinary steel, serious boiling were invalid.” In October 1977, the company made a further explanation on the clause of sentence making and washauling: “In-mold boiling severely involved the powder residue.” In the period from 1972 to 1978, a steelmaking mill averaged 1,357 tons of scrap steel per annum (including 1008 tons of boiling boiling cap and 349 tons of in-mold boiling waste) during the period from 1972 to 1978. The second-batch steelmaking plants have also been scrapped in recent years . Obsolete slaughter of ingot-type words, there are big under the small belt