A method of splitting narrow materials, such as flat bar stock and structural 1-beams and channels to prevent warpage. In this method, the cut is made at several intervals, depending on the width of the material, leaving a series of uncut sections along the line of cut, each about 12 to 25 mm (1/2 to 1 in.) long. These uncut ligaments hold the material in line until cooled, then the material is cut through to separate the pieces.