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Process for preparing a steel plate, steel plate, and processes to increase the resistance of the propagation of crack of a steel plate.And to control the average ratio of length to thickness of pancake pancake during processing of a steel plate
Process for preparing a steel plate, steel plate, and processes to increase the resistance of the propagation of crack of a steel plate.And to control the average ratio of length to thickness of pancake pancake during processing of a steel plate
Process for preparing a steel plate, steel plate, and processes to increase the resistance of the propagation of crack of a steel plate.And to control the average ratio of length to thickness of pancake pancake during processing of a steel plate.A low alloy steel, weld on, ultra high strength, excellent toughness at cryogenic temperature in the base plate and the heat affected zone (HAZ) when welded.Having a tensile strength greater than about 830 MPa and a microstructure that includes (I) lower bainite predominantly of fine grain, martensita blade of fine grain.Finely granular bainite (FGB), or mixtures thereof, and (II) to about 10% by volume of retained austenite.It is prepared by heating a steel plate which includes iron and percentages of weight specified to some or all of the additives carbon, manganese, nickel, nitrogen, copper, chromium, molybdenum, silicon,Niobium, vanadium, titanium, aluminium,Boron; reducing the plate to form the plate in one or more passes in a temperature range in which austenite is recristaliza; laminar for finishing the plate in one or more passes in a range of 'Mperatura below the temperature of recrystallization of austenite and above the temperature of the processing air 3; cold rolled sheet finished quickly to a temperature to stop cooling ade.The cod end (QST); stopping the cooling fast, and for a period of time, to keep the plate substantially isothermal to QST or cool slowly the plate before cooling in the air.Or simply chill in the air the plate to room temperature.
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