3. Features of mandrel bar and push bench
　　Features of mandrel bar

　　1. Adopts the pre-perforation technology, thus shorten the period time of the rolling mill when rolling the 210 pass size.

　　2. Adopts the mandrel bar cooling tunnel, which cools the surface of conveying mandrel at high speed.

　　3. Adopts advanced QAS (Quality Assurance System) to conduct the online monitor of the temperature of cooled mandrel bar.

　　4. Employs chains to convey the lubricated mandrel bar in prevention of fall-off of the lubrication layer.

　　Features of push bench
　　1. Adopts the three-stand and three-roll extracting method. The numbers of stands are small and the equipment is light.

　　2. The entrance speed is automatically matched with the exit speed of the rolling mill, thus the pierced billet is to be extracted from the mandrel online.

　　3. Adopts the fast-changing roll system with short roll-changing time.