CV 黑鉛鑄鐵의 製造에 관한 基礎硏究

Abstract

본 연구에서는 구상흑연주철용 용탕보다 S 및 Mn의 함량이 다소 높은 灰鑄鐵用 熔湯(GC-10規格)을 사용하여 黑鉛球狀化劑의 少量첨가법에 의한 CV黑鉛鑄鐵을 제조하는데 필요한 基礎資料를 얻고자 시도하였다.

특히 본 연구에서는 흑연구상화제의 첨가량에 따른 잔류화학성분의 변화 및 흑연조직의 변화에 관하여 중점적으로 고찰하였다.

그 결과 Mg回收率은 Fe-Si-Mg첨가량이 적을수록 높으며, CV黑鉛組織은 Mg當量/S의 값에 따란 변화하며 fading 효과는 CV黑鉛鑄鐵의 경우가 구상흑연주철의 경우보다 매우 완만함을 알 수 있었다.

A method for the production of Compacted-Vermicular graphite cast iron with GC-10 melt by means of additions of Ge-Si-Mg alloy gas been studied.

The variations of both the residual alloying compositions and the structure of as-cast iron with the amount of Fe-Si-Mg additive have been investigated, and following results were obtained; the ratio of residual Mg content in the as-cast iron to the initial amount of additive has been decreased with increasing amount of Fe-Si-Mg additive. The graphite structure of the as-cast iron gas been found to vary with the ratio of Mg equbalent/S, and fading phenomena with holding time in Compacted-Vermicular graphite cast iron has been found to occur more slowly than in spheroidal graphite cast iron.

A method for the production of Compacted-Vermicular graphite cast iron with GC-10 melt by means of additions of Ge-Si-Mg alloy gas been studied.

The variations of both the residual alloying compositions and the structure of as-cast iron with the amount of Fe-Si-Mg additive have been investigated, and following results were obtained; the ratio of residual Mg content in the as-cast iron to the initial amount of additive has been decreased with increasing amount of Fe-Si-Mg additive. The graphite structure of the as-cast iron gas been found to vary with the ratio of Mg equbalent/S, and fading phenomena with holding time in Compacted-Vermicular graphite cast iron has been found to occur more slowly than in spheroidal graphite cast iron.