在150吨顶吹氧气转炉上试验了4炉A3b半镇静钢。试验钢锭表面质量得到了改善,钢坯的处理量降到10％以下,可不经表面清理直接加热、轧制,废品量显著下降,气泡废品基本消除,成材率有很大提高,达到和超过了A3的水平。 Four A3b semi-killed steels were tested on a 150-ton top-blowing oxygen converter. The surface quality of the test ingot has been improved, the handling capacity of the billet is reduced to less than 10%, direct heating and rolling can be carried out without surface cleaning, the amount of the scrap products is significantly reduced, the bubble scrap is basically eliminated and the finished product rate is greatly improved, reaching and exceeding A3 s level.