냉간 가공성이 우수한 고경도·고내식성 용도의 마르텐사이트계 스테인리스강 및 그 제조 방법

• Main Authors: TOHJOH MASAYUKI, FUDANOKI FUMIO, TANAKA KISUKE, TAKANO KOHJI
• Format: Patent
• Language: Korean
• Published: 08.07.2022
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

냉간 가공성이 우수한 고경도·고내식성 마르텐사이트계 스테인리스강의 연화 어닐링재는, 질량％로, C: 0.15 내지 0.70％, Si: 2.0％ 이하, Mn: 1.5％ 이하, S: 0.01％ 미만, P: 0.05％ 이하, Ni: 1.5％ 이하, Cr: 10.5 내지 16.0％, Mo: 0.9 내지 3.0％, N: 0.14％ 이하, Al: 0.008 내지 1.0을 함유하고, O: 0.001 내지 0.008％ 이하를 함유하고, 잔부 Fe 및 불순물을 포함하는 화학 성분을 갖고, C+N/2: 0.14 내지 0.70％이며, 또한 1㎛ 이상의 탄질화물이 1600㎛2 중에 10개 이상이고, 산화물의 평균 직경 사이즈가 1 내지 5㎛이고, Hv 경도≤(60C+170)이다. A soft-annealed material of a high-hardness and high-corrosion resistance martensitic steel that has excellent cold workability. The soft-annealed material has a chemical composition that contains, by mass%, 0.15%-0.70% of C, no more than 2.0% of Si, no more than 1.5% of Mn, less than 0.01% of S, no more than 0.05% of P, no more than 1.5% of Ni, 10.5%-16.0% of Cr, 0.9%-3.0% of Mo, no more than 0.14% of N, 0.008%-1.0% of Al, and 0.001%-0.008% of O, the remainder being Fe and impurities, and C+N/2 being 0.14%-0.70%. There are at least 10 carbonitride particles of at least 1 μm per 1600 μm2, the average oxide particle diameter is 1-5 μm, and the Hv hardness is no more than (60C+170).