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Unsealed steel types with ultra-high strength and excellent toughness at cryogenic temperatures, as well as methods for producing and increasing crack propagation resistance of such
Unsealed steel types with ultra-high strength and excellent toughness at cryogenic temperatures, as well as methods for producing and increasing crack propagation resistance of such
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机译：在低温下具有超高强度和优异韧性的未密封钢种，以及生产和提高这种钢的抗裂纹扩展性的方法
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摘要
An ultra-high strength, weldable, low alloy steel with excellent cryogenic temperature toughness in the base plate and in the heat affected zone (HAZE) when welded, having a tensile strength greater than 830 MAP (120 KS) and a micro-laminate microstructure comprising austenite film layers and fine-grained marten site/lower bainite laths, is prepared by heating a steel slab comprising iron and specified weight percentages of some or all of the additives carbon, manganese, nickel, nitrogen, copper, chromium, molybdenum, silicon, niobium, vanadium, titanium, aluminum, and boron; reducing the slab to form plate in one or more passes in a temperature range in which austenite recrystallizes; finish rolling the plate in one or more passes in a temperature range below the austenite recrystallization temperature and above the Ar3 transformation temperature; quenching the finish rolled plate to a suitable Quench Stop Temperature (QST); stopping the quenching; and either, for a period of time, holding the plate substantially isothermally at the QST or slow-cooling the plate before air cooling, or simply air cooling the plate to ambient temperature.
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