Abstract: Cold rolled, recrystallization annealed, high strength steel for porcelain enameling. The steel consists essentially of at least 0.005 wt. % niobium, at least 0.02 wt. % carbon, at least 0.10 wt. % manganese, at least 0.01 wt. % aluminum, nitrogen as an impurity, the ratio of acid sol. aluminum to total nitrogen being at least 2:1, all percentages by weight and the balance being iron and unavoidable impurities, whereby the annealed steel has a yield strength of at least 21 kg/mm.sup.2 after being strained at least 8% and when heated to at least 815.degree. C. The steel is produced by hot rolling a slab to a sheet having a finishing temperature at least A.sub.r3, coiling the hot rolled sheet at a temperature at least 677.degree. C. to precipitate residual nitrogen as aluminum nitride, removing scale from the hot rolled sheet, cold rolling the descaled sheet, annealing the cold rolled sheet without decarburization at a temperature less than 721.degree. C.

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.