Considering of not decreasing the fluidity of steel in production, we can apply low superheat technique to cast steel under protection. This helps to reduce the column crystal area, enlarge the ,that to say, it improves the inner billet quality.

• 在连铸生产过程中尽量在钢水流动性不影响生产的情况下，采用低过热度保护浇铸，这有利于铸坯内部缩小柱状晶区，扩大等轴晶区，这有利于提高铸坯的内部质量。