METHOD OF MANUFACTURING STEEL MATERIAL

• Main Authors: MIYAMOTO NORITAKA, OKUMIYA MASAHIRO, YOSHIDA MASASHI, HARA TAMIO, ICHIKI RYUSUKE, TSUNEKAWA YOSHIKI
• Format: Patent
• Language: English
• Published: 09.09.2010
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PROBLEM TO BE SOLVED: To provide a method of manufacturing steel material which permits inexpensive treatment without a severe temperature control for steel material, improves mechanical strength and, at the same time, hardly brings about the deterioration of toughness. SOLUTION: Nitriding gas is turned into plasma by introducing electron beams which are drawn from discharge plasma and are accelerated into the environment of the nitriding gas, and a low-carbon steel material is caused to be brought into contact with the nitriding gas which is turned into the plasma to perform the solid solution of nitrogen atoms of the nitriding gas from the surface into the internal part of the low-carbon steel material. COPYRIGHT: (C)2010,JPO&INPIT