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1.前言45优质结构钢和碳素铸件钢传统的冶炼工艺一直是遵循熔化——氧化——还原“老三段”进行操作。虽然近几年来国内不少厂家在普碳钢,碳素铸件钢的冶炼工艺方面进行了一些改进(单渣法、缩短还原期等),但很少作为一种常规操作推广到45优质结构钢的生产中。即使普碳钢和铸件钢是用单渣法冶炼,仍然着重强调氧化期的脱碳量,以致确保钢的质量。我们制定的新工艺经过1983～1985年三年时间的摸索试验和推广应用,
1. INTRODUCTION 45 High-quality structural steel and carbon cast steel Traditional smelting processes have always followed the “third-stage melting-oxidation-reduction” operation. Although in recent years many domestic manufacturers in the carbon steel, carbon steel casting smelting process carried out some improvements (single slag method, shorten the reduction period, etc.), but rarely as a general operation to 45 high-quality structural steel In the production. Even though plain carbon steel and cast steel are smelted by the single-slag method, the amount of decarburization in the oxidation stage is still emphasized, so that the quality of the steel is ensured. We have developed a new process after 1983-1985 three years of exploration and trial application and promotion,