| 摘要 |
The invention relates to metallurgical lances. Normally such lances are formed by a heavy metal tube encased in a refractory sleeve and because of their relatively long length such lances flex in use thereby propogating cracks in the refractory and encouraging the growth of cracks that are otherwise formed during shock loading of the lance as it enters the bath of metal and because of differential expansion that occurs between the refractory and the tube. The object of the invention is to provide a lance of high rigidity and reduced tendancy to cracking and spalling which objective is met by a metallurgical lance having a tubular member for the passage of gas or the mixture of gases and solids, said member being encased in a sleeve of an appropriate refractory, there being arranged around the periphery of the tubular member, and spaced therefrom, a number of longitudinal reinforcing members also encased in the refractory sleeve.
|
