天津第一炼钢厂在炉底面积为23米~2和29米~2,超装至85～90吨,单上升道,重油为燃料,全部冶炼镇静钢的平炉上使用细颗粒镁砂炼炉,每次炼炉时间约须二小时,炉底寿命一般可达三十炉左右。比较稳定,很少出现翻坑和浮起等现象,因而基本上可做到按计划炼炉。74年全年平均炼炉率为1.69%,比73年下降0.42%。 The first steelmaking plant in Tianjin has an area of ​​23m ~ 2m and 29m ~ 2 at the bottom of the furnace. It is super-mounted to 85-90t. It is only used for ascending the road and heavy oil as fuel, and all fine sand magnesia Furnace, each furnace time about two hours, the furnace bottom life of up to about thirty furnaces. Relatively stable, there is little turbulence and floats and other phenomena, which can basically be done according to the plan furnace. The average annual melting furnace rate in 1974 was 1.69%, down 0.42% over the previous year.