2015年11月17日,衡阳华菱钢管有限公司(简称华菱衡钢)首次批量生产的X46N钢级、Φ559 mm×15.88 mm规格被覆管线管已顺利入库3 000余吨,其实物性能、尺寸精度和被覆质量良好。被覆管线管对母管的表面质量和尺寸精度要求很严格,其生产难度大、表面质量和尺寸精度难以控制。华菱衡钢通过优 November 17, 2015, Hengyang Valin Steel Pipe Co., Ltd. (referred to as Valin Heng Steel) for the first time mass production of X46N steel grade, Φ559 mm × 15.88 mm coated pipe specifications have been successfully deposited more than 3,000 tons of physical properties, Dimensional accuracy and coating quality is good. The quality of the surface quality and dimensional accuracy of the pipe covered by the coated pipe is very strict, its production is difficult, and the surface quality and dimensional accuracy are difficult to control. Valin Hengyang through excellent