Is there any anti-dumping when American customers import aluminum plates from China?

For some specifications of aluminum plates, American customers purchase aluminum sheets from China with anti-dumping, such as 1 series aluminum sheet, 3 series aluminum plate, 5 series aluminum sheets, 8 series aluminum sheet alloys and countervailing tax rate 46.48% – 116.49%, anti-dumping 49.85-59.72%, but there is no anti-dumping for the thickness above 6.35mm, and there is no anti-dumping for 6 series aluminum plate.