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2012年7月19日,衡阳华菱钢管有限公司Φ720mm周期轧管机组首次成功轧制出45钢Φ740mm×75mm无缝钢管,成功突破该机组生产极限规格。
On July 19, 2012, the Φ720mm periodic tube rolling mill of Hengyang Valin Steel Pipe Co., Ltd. succeeded in rolling out 45 steel Φ740mm × 75mm seamless steel tubes for the first time and successfully broke through the production limit specifications of this unit.