2010年1月21日,美商务部网站公布,应美国内产业和工会组织申请,美国商务部决定对进口自中国的钻管发起“双反”调查。调查涉及的产品包括钻管及钻铤。涉案产品美国进出口商品编码(HTSUS)为:7304.22.0030,7304.22.0045.7304.22.0060,7304.23.3000,7304.23.6030,7304.23.6045,7304.23.6060,8431.43.8040,同时涉案产品也可能以如下编码进入美国:8431.43.8060,8431.43.4000,7304.39.0028,7304.39.0032,7304.39.0036,7304.39.0040,7304.39.0044,7304.39.0048,7304.39.0052,7304.39.0056,7304.49.0015,7304.49.0060,7304.59.8020,7304.59.8025,7304.59.8030,7304.59.8035,7304.59.8040,7304.59.8045,7304.59.8050和7304.59.8055。申请方主张的倾销幅度为429.53%-496.93%,补贴幅度超过微量