大型氧化物夾雜在鋼錠底部錐中聚積機理的研究

Research on the Mechanism for the Accumulotion of Large Oxide Inclusions in the Bottom of Ingots

摘要: 用NH₄Cl水溶液和塑料粒子模擬了鋼中大型夾雜物在鋼錠底部錐聚積過程,提出了聚積機理,并導出了夾雜聚積量的數學方程:
Q = \fracA\rm\cdotb1 - \alpha (\int_t_1^t_0 (\overline V - U_S) C_0dt + \int_t_0^t + t_s (\overline V - U_S) kC_0dt)
實驗結果在生產中得到了驗證。減少鋼錠底部夾雜物的有效措施是向鋼錠帽部加發熱劑和適當的注溫。加發熱劑時,要注意加入時間和加入方法。

Abstract: The model experiments on the accumlation of large oxide inclusion in the bottom of ingots during pouring were carried out by using NH4C1-water solution and plastic particles.The mechanism for the accumulation of inclusion were proposed. The quantity of inclusions may be indicated by the following equation:
Q = \fracA\rm\cdotb1 - \alpha (\int_t_1^t_0 (\overline V - U_S) C_0dt + \int_t_0^t + t_s (\overline V - U_S) kC_0dt)
It was found that the result of experiments were in good agreement with plant practises.
Accumulation of the large inclusion on the bottom of ingots is effectively inhibited by the application of the heat-generating agent in the ingot cap but the adding time and method is of very important.
For reducing inclusion, it is necessary to cast steel in a suitable temperature.