The straightening machine changes the straightness by extruding a bar or the like with a straightening roller. There are generally two rows of straightening rollers, varying in number. Relying on the angle change of two rollers (concave in the middle, hyperbola roller) to straighten materials of different diameters. This machine is a special metallurgical equipment for straightening the bending and section ellipse of various pipes (or bars).

Steel pipe cutting machine is widely used in petroleum, chemical industry, electric power, natural gas, metallurgy, shipbuilding, boiler, pharmaceutical, water treatment and other industries, as well as pipeline installation engineering and pipeline maintenance of new projects. Small size, light weight, split body structure, can be clamped and cut in any part of the pipeline, especially suitable for pipeline installation engineering, pipeline maintenance, and field operations.