This machine is used for the straightening of H-beam flange plate after welding and distortion. It has mechanical and hydraulic two series. Mechanical straightening machine (DTJ-600,DTJ-800)，has simple structure and easy operated. Hydraulic straightening machine (DTYJ-60A\DTYJ-60B) has big straightening ability, wide range and high automatic standard. Wheel and roller adopt high quality alloy steel, can be used for a long term.