seamless pipes are made of 10, 20, 30, 35, 45 high-quality carbon steel, 16Mn, 5MnV low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steels, hot-rolled or cold-rolled.
seamless pipes must ensure strength and flattening tests. Hot-rolled steel pipes are delivered in hot-rolled or heat-treated states; cold-rolled steel pipes are delivered in hot-rolled or heat-treated states.