Accumulated debris shall be removed by vacuum, blowing with oil-free air, or wiping with clean rags.
打磨杂物用吸尘器吸走，或使用无油气体吹掉，用干布擦净。
2
It is shown that, for the refining of extra-low oxygen steel under low vacuum, blowing argon through porous plug into molten steel can effectively remove oxide inclusions from molten steel.