IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0134874
(1987-12-18)
|
우선권정보 |
JP-0311959 (1986-12-30); JP-0311960 (1986-12-30); JP-0000100 (1987-01-03) |
발명자
/ 주소 |
- Tanaka Teruo (Yamaguchi JPX) Miyakusu Katsuhisa (Yamaguchi JPX) Fujimoto Hiroshi (Yamaguchi JPX)
|
출원인 / 주소 |
- Nisshin Steel Co., Ltd. (Tokyo JPX 03)
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
0 |
초록
▼
Process for producing steel strip of duplex structure wherein cold rolled strip of chromiun stainless steel comprising, in addition to Fe, 10.0% to 20.0% of Cr, to 0.15% of C, to 0.12% of N, the (C+N) being 0.02% to 0.20%, to 2.0% of Si, to 1.0% of Mn and to 0.6% of Ni, is continuously passed throug
Process for producing steel strip of duplex structure wherein cold rolled strip of chromiun stainless steel comprising, in addition to Fe, 10.0% to 20.0% of Cr, to 0.15% of C, to 0.12% of N, the (C+N) being 0.02% to 0.20%, to 2.0% of Si, to 1.0% of Mn and to 0.6% of Ni, is continuously passed through a heating zone where it is heated to form a two-phase of ferrite and austenite and the heated strip is cooled at a cooling rate sufficient to transform the austenite to martensite. The product has high strength and elongation reduced plane anisotropy and hardness of at least HV 200.
대표청구항
▼
A process for the production of a strip of a chromium stainless steel of a duplex structure, consisting essentially of ferrite and martensite, having high strength and elongation as well as reduced plane anisotropy and having a hardness of at least HV 200, which process comprises: a step of hot roll
A process for the production of a strip of a chromium stainless steel of a duplex structure, consisting essentially of ferrite and martensite, having high strength and elongation as well as reduced plane anisotropy and having a hardness of at least HV 200, which process comprises: a step of hot rolling a slab of a steel to provide a hot rolled strip, said steel consisting essentially of, by weight,: up to 0.10% of C, up to 2.0% of Si, up to 1.0% of Mn, up to 0.040% of P, up to 0.030% of S, up to 0.60% of Ni, from 10.0% to 14.0% of Cr, up to 0.08% of N, the (C+N) being not less than 0.02% but not more than 0.12%, up to 0.02% of O, up to 0.20% of Al, up to 0.0050% of B, up to 2.5% of Mo, up to 0.10% of REM, and up to 0.20% of Y, the balance being Fe and unavoidable impurities; at least two steps of cold rolling the hot rolled strip to provide a cold rolled strip of a desired thickness, including a step of intermediate annealing between the successive two cold rolling steps, said intermediate annealing comprising heating and maintaining the strip at a temperature to form a single phase of ferrite; and a step of continuous final heat treatment in which the cold rolled strip is continuously passed through a heating zone where it is heated to a temperature ranging from the Ac1 point of the steel to 1100°C. to form a two-phase of ferrite and austenite and maintained at that temperature for not longer than 10 minutes, and the heated strip is cooled at a cooling rate sufficient to transform the austenite to martensite.
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