variable-beam caster(Bethlehem had committed $ 100 million principally to install an electric furnace, a variable-beam caster as well as to upgrade the rolling mill and increase process control. 伯利恒钢公司已拨付 1 亿美元,主要用于建造一座电炉和一台可调尺寸工字梁坯连铸机、对轧机进行升级改造以及提高工艺控制能力。)