Alloys or metallic compositions – Ferrous – Chromium containing – but less than 9 percent
Patent
1988-12-12
1990-09-18
Yee, Deborah
Alloys or metallic compositions
Ferrous
Chromium containing, but less than 9 percent
420106, 420110, 420111, C22C 3832
Patent
active
049577026
ABSTRACT:
Air-hardenable steels of duplex bainite/martensite microstructure consisting essentially of 0.10 to 0.7% C, 0.1 to 2% Si, 2.1 to 3.5% Mn, 0.0005 to 0.005% B, up to 3.5% Cr and preferably containing Cr in amount of at least 0.1%, balance Fe except for incidental impurities. Optional elements are up to 1.5% W, 1.0% Mo, 0.15% V, 0.2% S, 0.1% Ca, 0.1% Pb, 0.1% Ti and 0.2% total rare earths. At least 1.0% Cr is especially preferred and if below such amount, total Mn and Si is at least 3% and in such case, if C is under 0.47%, at least 0.6% Si is present. The steels are hardenable to R.sub.c 20 to R.sub.c 58 and have a hardenable diameter in the range between 35 mm and 80 to 100 mm by air-cooling only, together with good strength, toughness and fatigue- and wear-resistance.
REFERENCES:
patent: 2861908 (1958-11-01), Michelson et al.
patent: 4544406 (1985-10-01), Yamamoto et al.
patent: 4812182 (1989-03-01), Fang et al.
Fang et al, Acta Metall Sin. (China) A283-A-288, 1986.
Fang et al., "The Strength and Toughness of the Air-Cooled Microstructure of Medium Carbon Bainite/Martensite Dual Phase", Trans. Met. Treat. (China) (1) 10-18, 1986.
Fang et al, "Heat Treat. Met." (China) (9) 3-8, Sep. 1985.
Bai et al, "Transformation of Granula Bainite in Low-Carbon Alloy Steels", Trans. Met. Heat Treat. (China) 5, (2), 15-34, Dec. 1984.
Chen Donghao
Chen Xiuyun
Fang Hongsheng
Zhao Rufa
Zheng Yankang
Pegan John R.
Qinghua University
Yee Deborah
LandOfFree
Air-cooling duplex bainite-martensite steels does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Air-cooling duplex bainite-martensite steels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Air-cooling duplex bainite-martensite steels will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1571463