Abstract: The present invention relates to a heating device comprising a heat generating portion composed of a mixture of at least of ferric oxide, cupric oxide and trilead tetroxide powder and powder of silicon and/or silicon-iron alloy, a firing portion disposed contiguous to said heat generating portion and constituted by mixing boron or aluminum powder with at least one of ferric oxide, cupric oxide, barium peroxide and strontium peroxide powder, and an igniting portion situated adjacent to said firing portion and composed of a mixture of red phosphorus and potassium chlorate which is ignited by frictional heat or sparks of a flint. This heating device is capable of quick and easy heating of an object to be heated with no need of using any extraneous heating means. The invention also provides an instantaneous heater utilizing the heating device.

Abstract: A metal extrusion process with high reduction wherein a metal blank is extruded from a container through an opening which is formed by a plurality of work rolls. The metal blank is guided to the opening from the outlet of the container by causing the metal blank to adapt to the shape of the opening by means of a forming die so that the metal blank does not overfill the opening. This extrusion process is capable of forming the metal blank into a product having the desired cross section with high elongation in one pass and also the radius of curvature of the corner portion of the product can be freely adjusted.

Abstract: In a method of producing seamless steel tube from billet having a square or rectangular cross-section by the step of piercing a workpiece and rolling steps following the piercing step, each of such steps being conducted with a plug held by a mandrel toward the center of cross section of the workpiece while the workpiece is rolled by a pair of rolls with axes arranged horizontally.