- 期刊
高矽電磁鋼的鋼胚寬度控制方法
The Width Control of Hi-Silicon Electric Steel Slabs
摘要
高矽電磁鋼在凝固過程中的相變態與一般碳鋼不同，會有α相變態的ferrite析出，其鋼胚凝殼的強度極弱。凝殼出銅模後，容易受鋼液靜壓而變形，造成鋼胚超寬，因此產出的鋼胚寬度極難控制。藉由統計手法，分析相同的模寬產出不同寬度的鋼胚與電磁鋼成分中的矽當量〔Si+3Al〕關係，將高矽電磁鋼區分三種不同相變態鋼種群，建立〔Si+3Al〕＜ 1.85%為單一γ相變態，〔Si+3Al〕= 1.85%～2.15%為α+γ？相變態，〔Si+3Al〕＞ 2.15%為單一α相變態的理念。最後，找出各個不同鋼種群的鋼胚寬度變化率與連鑄操作的相關因素，利用正確的鋼胚寬度變化率來作不同的模寬設定基準。藉此原則，目前已可穩定的控制高矽電磁鋼的鋼胚寬度命中率達到90%以上。
並列摘要
The phase transformation of high silicon electric steel during sodification process is called α - phase which is different from that of carbon steel. In α-phase ferrite crystal precipitates, and results in extremely weak shell. As soon as this kind of solidified shell comes out from the mold, due to the ferrostatic pressure to the narrow face, slab easily becomes oversized; so it is hard to control the width of hi-silicon electric steel slabs. Based on the same mold width setting, through statistics and analysis of the relationship between slab width variation and silicon equivalent of [Si+3Al] in high silicon electric steel ; this kind of steel can be categorized into three groups, the first group has unitary γ phase with [Si+3Al] ＜ 1.85%, the second one has α +γ dual phase with [Si+3Al] between 1.85% and 2.15%, the other one has unitary a phase with [Si+3Al] ＞ 2.15%. Finally, We find out the relationship of slab shrinkage ratio and the casting condition in each group respectively, and set the mold width accordingly. Now, we can meet the required slab width of high silicon electric steel with a probability well over 90%.