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美国Nucor－Berkeley钢厂从１９９８年１２月开始，轧制各种型材均能达到一次成型。一次成型的特种轧钢机是由意大利达涅利公司提供的。利用该轧机能够生产等边工字钢宽为１５０mm×１５０mm和不等边工字钢３５０mm×１２５mm宽、中间梁高从７５～２５０mm。全套设备的自动控制
Since December 1998, the Nucor-Berkeley steel mill in the United States has been able to achieve a single pass by rolling various profiles. A once-molded special mill is supplied by Danieli, Italy. With this mill, it is possible to produce isobaric I-beams with a width of 150 mm × 150 mm and an unequal-length I-beam of 350 mm × 125 mm and a middle beam height of 75 to 250 mm. Full set of equipment for automatic control