Metal treatment – Compositions – Heat treating
Patent
1983-09-26
1985-08-13
Skiff, Peter K.
Metal treatment
Compositions
Heat treating
148 12F, 148 124, 148 36, C21D 802
Patent
active
045348057
ABSTRACT:
Low alloy steel shape of at least 3/16 inch thickness is produced by providing a steel consisting essentially of from about 0.02% to 0.07% carbon, 1.2% to 2.0% manganese, 0.020% maximum sulfur, up to 0.5% silicon, 0.1% to 0.4% molybdenum, 0.01% to 0.1% columbium, about 0.01% to 0.10% acid soluble aluminum, about 0.8% to 2.0% copper, about 0.4% to 2.0% nickel, residual chromium, and balance iron; hot reducing the steel to a desired final thickness with a total reduction in thickness of at least 30% while within the temperature range of about 1400.degree. to 1700.degree. F. whereby to avoid substantial recrystallization of austenite and to obtain a predominant heavily deformed austenite phase; and cooling at a rate which transforms the austenite phase to a predominantly fine acicular ferrite and lower-bainite phase. The steel may also be precipitation hardened, or may be hot reduced either by the above-described controlled hot reduction or by conventional hot reduction, austenitized, quenched, and precipitation hardened. The product has high strength, improved low temperature toughness and excellent weldability.
REFERENCES:
patent: 3539404 (1970-11-01), DeRetana
patent: 3692514 (1972-09-01), Hydrean
patent: 3726723 (1973-04-01), Coldren et al.
patent: 4184898 (1980-01-01), Ouchi et al.
patent: 4388123 (1983-06-01), Murayama
Hamre, "Properties of Acicular-Ferrite Steel for Large-Diameter Line Pipe", Micro Alloying 75, Conf. Wash., D.C., Session 2B, Oct. 1975, pp. 21-27.
Civallero, "Production of Large-Diameter High-Strength, Low Alloy Pipe in Italy", Micro Alloying 75, Conf. Wash., D.C., Session 2B, Oct. 1975, pp. 81, 93-95.
Morcinek, "Structural Steels with Acicular Ferrite", Micro Alloying 75, Conf. Wash., D.C., Oct. 1975, Session 2A, pp. 41-47.
Armco Inc.
Skiff Peter K.
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