Technology to Reducing the Oxygen Content in Coupler Castings

摘要

It is very important to produce coupler steel castings with low oxygen content and the exact aluminum residuals. Low and inconsistent aluminum elemental recovery problems are often encountered when adding aluminum strips or lumps into the baths of 25MnCrNiMo steel. This is the case because aluminum presents some of the following characteristics: low melting point, lower density much more than the molten steel, low solubility in the liquid steel, high affinity due to oxygen. These circumstances lead to difficulties or risks, such as: poor or erratic recovery of alloying aluminum element, oxygen content in casting out of range, violent and dangerous splashing. To counter these problems existed in conventional method, aluminum wire injection process was introduced in this work, and the effects of aluminum wire feeding are investigated. The results show when using the aluminum wire injection, stable cleaner steel melt is obtained, i.e. oxygen content and the aluminum residuals are under control accurately, and what's more, the recovery of the aluminum is 95%. The treatment time was about 1 minute, and the melting period was shortened. Favorable metallurgical achievements and economical benefits were gained.