Metal treatment – Stock – Ferrous
Patent
1987-07-31
1989-03-14
Roy, Upendra
Metal treatment
Stock
Ferrous
148 12F, 148337, C22C 3814
Patent
active
048121827
ABSTRACT:
Steel articles have a granular bainite microstructure on continuous air cooling, from hot working temperature, of a low cost, tough, high strength, low alloy (HSLA) steel having a composition which, in broadest scope, scope, consists essentially, by weight percent, of 0.08 to 0.25% carbon, 0.30 to 1.5% silicon, 2.0 to 3.2% manganese and 0.005 to 0.005% boron. The steel composition preferably contains, in one aspect of the invention: 0.08 to 0.18% carbon, 0.3 to 1.2% silicon, 2.1% to 2.5% manganese and 0.005 to 0.004% boron; and in another aspect: 0.08 to 0.18% carbon 0.7 to 1.2% silicon, 2.7 to 3.1% manganese, and 0.0005 to 0.004% boron. The steel optionally may contain, by weight percent: up to 0.10 calcium and up to.0.20%, preferably less than 0.01%, sulfur, or up to 0.10% lead; up to 0.10%, especially 0.04 to 0.10%, vanadium, and up to 1.5% chromium. The steel is substantially free of molybdenum, tungsten and other alloying elements, except for residual amounts.
REFERENCES:
patent: 2280283 (1942-04-01), Crafts
Fang et al, Acta Metall Sin. (China) A283-A288, 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 Granular Bainite in Low-Carbon Alloy Steels, Trans. Met. Heat Treat. (China), 5, (2), 15-34, Dec. 1984.
Chen Ziuyun
Fang Hongsheng
Gu Jiaoyou
He Guangchu
Tong Keging
Pegan John R.
Roy Upendra
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