我厂在镇静钢方面目前所炼的钢种有:3,3,5和螺纹钢数种,其化学成分规定如下:以上各钢种的浇注方法,基本上是相同的。出钢以后,规定镇静时间是3分钟,在一般情况下,实际的镇静时间为3—5分,但有两钟情况:①由于盛钢桶发生漏钢而不能镇静;②由于行车调度发生困难,或其他原因,以使镇静时间延长至5分钟以上,甚至达到8分钟,在镇静时间内,钢水在桶内温度下降 I plant in the static steel currently refining the types of steel are: 3,3,5 and several kinds of rebar, the chemical composition is as follows: The above casting method of steel is basically the same. After the tapping, the provisions of the calm time is 3 minutes, in general, the actual sedation time is 3-5 minutes, but there are two cases: ① due to the steel drum leak and can not be sedated; ② due to traffic control difficulties , Or other reasons, so that the sedation time extended to more than 5 minutes, or even up to 8 minutes, the sedation time, the temperature dropped in the barrel