General seamless steel pipe: is made of 10, 20, 30, 35, 45 and other high quality carbon bond steel 16Mn, 5MnV and other low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot rolled or cold rolled.10, 20 and other low carbon steel seamless pipe is mainly used for fluid delivery pipeline.45, 40Cr and other medium carbon steel made of seamless pipe for the manufacture of mechanical parts, such as cars, tractors stress parts.The general use of seamless steel pipe to ensure the strength and flattening test.Hot rolled steel pipes are delivered in hot rolled or heat treated state;Cold rolled delivery in heat treated condition.