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炼钢时铝是作脱氧用的,而且也是控制晶粒大小的一种合金元素。脱氧的目的是要求钢洁净并防止钢锭形成气泡和表面裂纹。晶粒大小的控制对于所要求的机械性能是极为重要的。用很少量的铝就可影响机械性能。如果铝含量被控制在特别窄的范围内,就可获得优质钢。图1所示是几种向钢液里加铝的常规方法。可是,由于铝和钢液之间的比重差别很大,用这些方法很难使铝深入钢水熔池,其中有一部分铝会返回到钢水熔池表面并很容易被空气和炉渣新氧化。因此铝的回收率降
Aluminum is used for deoxidation during steelmaking, but it is also an alloying element that controls the grain size. The purpose of deoxidation is to require clean steel and to prevent ingot formation of air bubbles and surface cracks. The control of grain size is extremely important for the required mechanical properties. With a small amount of aluminum can affect the mechanical properties. If the aluminum content is controlled within a particularly narrow range, you can get high-quality steel. Figure 1 shows several conventional methods for adding aluminum to molten steel. However, because of the large differences in the specific gravity between aluminum and molten steel, it is very difficult to get aluminum into the molten steel pool with these methods. Some of the aluminum will return to the surface of the molten steel pool and will easily be newly oxidized by air and slag. Therefore, the recovery rate of aluminum is reduced