IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0913920
(2001-08-17)
|
우선권정보 |
JP-0039529 (1999-02-18) |
국제출원번호 |
PCT/JP99/07084
(1999-12-16)
|
국제공개번호 |
WO00/49190
(2000-08-24)
|
발명자
/ 주소 |
- Takano, Koji
- Matsui, Takayoshi
- Yoshimura, Koichi
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
6 |
초록
▼
The present invention makes the best use of a low-cost chemical composition in providing a high strength and high corrosion resistance stainless steel, which has improved delayed fracture resistance and toughness in particular, for building and construction uses, and as, for example, a stainless ste
The present invention makes the best use of a low-cost chemical composition in providing a high strength and high corrosion resistance stainless steel, which has improved delayed fracture resistance and toughness in particular, for building and construction uses, and as, for example, a stainless steel tapping screw. The present invention is, specifically, a stainless steel and a stainless steel screw with high strength and high toughness and excellent in delayed fracture resistance, characterized by: comprising, by mass, 0.01 to 0.25% of C, 0.05 to 1.0% of Si, 0.1 to 2.0% of Mn, 0.1 to 3.0% of Ni, 11.0 to 16.0% of Cr, 0.01 to 0.15% of N, and 0.01 to 3.0% of Mo; containing, optionally, 0.001 to 0.005% of B and/or one or more of 0.05 to 0.5% of Ti, 0.05 to 0.5% of Nb, and 0.05 to 0.5% of W; having less than 10% of ferrite in the center portion of the material; and having a mixed structure of martensite and 3 to 30% of austenite in the surface layer from the outermost surface to the depth of at least 1 μm, and a method to produce the same.
대표청구항
▼
1. A stainless steel excellent in delayed fracture resistance characterized in that the stainless steel consists essentially of, by mass %, 0.06 to 0.25%. of C, 0.05 to 1.0% of Si, 0.1 to 2.0% of Mn, 0.1 to 3.0% of Ni, 11.0 to 16.0% of Cr, 0.01 to 0.15% of N, and 0.01 to 3.0% of Mo, with the balance
1. A stainless steel excellent in delayed fracture resistance characterized in that the stainless steel consists essentially of, by mass %, 0.06 to 0.25%. of C, 0.05 to 1.0% of Si, 0.1 to 2.0% of Mn, 0.1 to 3.0% of Ni, 11.0 to 16.0% of Cr, 0.01 to 0.15% of N, and 0.01 to 3.0% of Mo, with the balance Fe and unavoidable impurities; said stainless steel having a surface layer consisting of a dual structure of martensite and 3 to 30% of austenite in the surface layer from an outermost surface to a depth of at least 1 μm and a center portion consisting of less than 10% of ferrite with the center portion balance consisting of a martensite phase free from austenite phase. 2. A stainless steel excellent in delayed fracture resistance characterized in that said stainless steel consists essentially of, by mass %, 0.01 or more but less than 0.06% of C, 0.05 to 1.0% of Si, 0.1 to 2.0% of Mn, 0.1 to 3.0% of Ni, 11.0 to 16.0% of Cr, 0.01 to 0.15% of N, and 0.01 to 3.0% of Mo, with the balance Fe and unavoidable impurities, said stainless steel having a surface layer consisting of a dual structure of martensite and 3 to 30% of austenite in the surface layer from an outermost surface to a depth of at least 1 μm and a center portion consisting of 10 to 80% of ferrite with the center portion balance consisting of a martensite phase free from austenite phase. 3. A stainless steel excellent in delayed fracture resistance according to claim 1 or 2, characterized by further containing 0.001 to 0.005 mass % of B. 4. A stainless steel excellent in delayed fracture resistance according to claim 1 or 2, characterized by further containing, by mass %, 0.5% or less in total of one or more of 0.05 to 0.5% of Ti, 0.05 to 0.5% of Nb, and 0.05 to 0.5% of W. 5. A stainless steel excellent in delayed fracture resistance according to claim 1 or 2, characterized by further containing 0.4 to 2.0 mass % of Cu.
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