Most of the steel for line pipe is made by open-hearth, electric furnace, and basic-oxygen processes.
大部分建管道用管子的钢材由平炉、电炉和碱性顶吹转炉生产。
2
The fuel burner of an openhearthfurnace is water cool, as is the valve that regulate the flow of air and waste gases.
平炉的燃料燃烧室是用水冷却的，控制空气和废气的阀也是水冷的。
3
The tube bloom made by this method has given out the same physical and chemical test results as that made by basic open-hearthfurnace + vacuum degassing process + ESR process.