METHOD FOR HEAT TREATMENT OF STAINLESS MEMBER AND METHOD FOR PRODUCING FORGED STAINLESS PRODUCT

• Main Authors: HATANO KOHEI, KUROKI SHUHEI, OYAMA HIROHARU, MATSUNAMI YASUO, MATSUMURA TAKUMI, UMEZU NAOYUKI, MACHIDA MOTONARI, HARAGUCHI HIDETAKA
• Format: Patent
• Language: English; Korean
• Published: 22.11.2017
• Subjects: BLASTING; CHEMISTRY; ENGINE PLANTS IN GENERAL; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; HEATING; INDEXING SCHEME FOR ASPECTS RELATING TONON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES ORJET-PROPULSION PLANTS; INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04; LIGHTING; MACHINES OR ENGINES IN GENERAL; MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL ENGINEERING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; PERFORMING OPERATIONS; PUNCHING METAL; STEAM ENGINES; TRANSPORTING; WEAPONS

스테인리스 부재를 상변태하는 가열 시 상변태 온도 영역(Ar) 이상의 온도에까지 가열하는 가열 공정과, 가열 공정에서 가열된 스테인리스 부재를 상변태하는 냉각 시 상변태 온도 영역(Mr) 미만의 온도에까지 냉각하는 냉각 공정을 실행한다. 냉각 공정에서는, 냉각 시 상변태 온도 영역(Mr)을 포함하는 제어 온도 영역에서의 스테인리스 부재의 냉각을 억제한다. A heating step, in which a stainless member is heated to a temperature within or above a heating phase-transformation temperature range (Ar) in which the stainless member is phase-transformed, is executed. A cooling step in which the stainless member heated in the heating step is cooled to a temperature below a cooling phase-transformation temperature range (Mr) in which the stainless member is phase-transformed, is executed. In the cooling step, cooling of the stainless member is suppressed in a control temperature range including the cooling phase-transformation temperature range (Mr).