2021年6月7日，美国商务部对来自中国的无缝碳钢和合金钢标准的管线管和高压管(Seamless Carbon and Alloy Steel Standard, Line and Pressure Pipe)发布反倾销第二次日落复审终裁结果，裁定若取消该产品的反倾销令将会导致美国的相关产业继续受到重大损害。因此，继续执行该产品的反倾销令。该产品的海关税则号为：7304.19.1020, 7304.19.1030, 7304.19.1045, 7304.19.1060, 7304.19.5020, 7304.19.5050, 7304.31.6050, 7304.39.0016, 7304.39.0020, 7304.39.0024, 7304.39.0028, 7304.39.0032, 7304.39.0036, 7304.39.0040, 7304.39.0044, 7304.39.0048, 7304.39.0052, 7304.39.0056, 7304.39.0062, 7304.39.0068, 7304.39.0072, 7304.51.5005, 7304.51.5060, 7304.59.6000, 7304.59.8010, 7304.59.8015, 7304.59.8020, 7304.59.8025, 7304.59.8030, 7304.59.8035, 7304.59.8040, 7304.59.8045, 7304.59.8050, 7304.59.8055, 7304.59.8060, 7304.59.8065, 7304.59.8070。