High strength low alloy steel

Metal treatment – Stock – Ferrous

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148328, 420 92, 420 91, C22C 3842

Patent

active

053523040

ABSTRACT:
A high strength low alloy steel having a yield strength of at least 100 ksi and a Charpy V-notch impact strength of at least 35 ft-lbs. at minus 84.degree. C. (minus 120.degree. F.) at thickness of up to 6 inches is provided wherein the steel consists essentially of an effective amount up to 0.036% carbon, for low temperature toughness up to 5% manganese, up to 1% silicon, up to 0.015% sulfur, 2 to 4% nickel, up to 2% copper, up to 0.1% niobium, and up to 0.1% aluminum, up to 4.% molybdenum, up to 4% chromium and the balance iron and incidental impurities and is characterized by low carbon bainite microstructure in the as-quenched condition.

REFERENCES:
patent: 2199804 (1940-05-01), Matthes
patent: 3692514 (1972-09-01), Hurley
patent: 4534805 (1985-08-01), Jesseman
"High Strength Low Alloy Steels in Naval Construction", Montemarano et al, Journal of Ship Production, vol. 2, No. 3, Aug. 1986, pp. 145-162.
"Cold Cracking in welds in HSLA Steels", Graville, Welding of HSLA Steels, ASM, Metal Park, Ohio, 1978.
"Structure, Hardenability and Toughness of Low-Carbon High-Strength Steels", McEvily et al, Transformation and Hardenability in Steels Sym., Feb. 27-28, 1967.
"Development of Controlled Rolled Ultra Low Carbon Bainite Steel for Large Diameter Linepipe", Nakasugi et al, Alloys for the Eighties, May 1980.
Proceedings Accelerated Cooling on Rolled Steel, Haze et al, Canadian Inst. Mining and Metallurgy, Pergammon, 1988, pp. 235-248.
"High Strength Low Alloy Steels: A Decade of Progress", Pickering, Microalloying 75, 1977, p. 9.

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