High-strength steel material having excellent low-temperature strain aging impact properties and method for manufacturing same
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A technology of strain aging and impact characteristics, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of increased cold deformation, reduced use ambient temperature, reduced toughness and toughness, and achieved excellent low temperature strain aging impact characteristics.
Active Publication Date: 2018-08-03
浦项股份有限公司
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[0006] However, as structures etc. continue to become larger and more complex, the amount of cold deformation required for steel materials increases, and the temperature of the use environment decreases to that of the Arctic Ocean
Therefore, it is difficult to effectively prevent the decrease in toughness caused by strain aging of steel materials by conventional methods.
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[0079] Hereinafter, the present disclosure will be specifically described through the following examples. However, it should be noted that the following embodiments are only for describing the present disclosure in detail by way of illustration, and are not intended to limit the scope of rights of the present disclosure. The reason is that the scope of rights of the present disclosure is determined by the subject matter described in the claims and reasonably inferred therefrom.
[0080] (Example)
[0081] Steel slabs having the composition shown in Table 1 below were subjected to reheating, hot rolling, and normalizing heat treatment under the conditions shown in Table 2 below, thereby producing hot-rolled steel sheets having a final thickness of 6 mm or more.
[0082] The microstructural fraction, size and carbonitride fraction of each fabricated hot-rolled steel sheet were measured. In addition, the Charpy impact transition temperature, which can represent the strength (te...
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Abstract
The present invention relates to a steel material for pressure vessels, offshore structures and the like and, more specifically, to a high-strength steel material having excellent low-temperature strain aging impact properties and a method for manufacturing same, the high-strength steel material comprising 0.04-0.14 wt% of carbon (C), 0.05-0.60 wt% of silicon (Si), 0.6-1.8 wt% of manganese (Mn), 0.005-0.06 wt% of soluble aluminum (sol. Al), 0.005-0.05 wt% of niobium (Nb), 0.01 wt% or less (not including 0 wt%) of vanadium (V), 0.001-0.015 wt% of titanium (Ti), 0.01-0.4 wt% of copper (Cu), 0.01-0.6 wt% of nickel (Ni), 0.01-0.2 wt% of chromium (Cr), 0.001-0.3 wt% of molybdenum (Mo), 0.0002-0.0040 wt% of calcium (Ca), 0.001-0.006 wt% of nitrogen (N), 0.02 wt% or less of phosphorus (P) (not including 0 wt%), and 0.003 wt% or less of sulfur (S) (not including 0 wt%), with a balance of Fe and other inevitable impurities, and comprising a mixed structure of ferrite, pearlite, bainite and a martensite-austenite (MA) composite as a microstructure, wherein the fraction of the MA composite is 3.5% or less (not including 0%).
Description
technical field [0001] The present disclosure relates to steel materials used as materials for pressure vessels, offshore structures, and the like, and more particularly, to high-strength steel materials having excellent low-temperature strain-aging impact properties and methods of manufacturing the same. Background technique [0002] Recently, due to the depletion of energy sources, mining areas have moved to deep sea areas or arctic areas, and thus, mining and storage facilities have become larger and more complex. Steel materials used therein are required to have excellent low-temperature toughness to secure high strength and equipment stability to reduce weight. [0003] Meanwhile, since cold deformation often occurs in the process of manufacturing steel with strength and toughness as described above to form steel pipes or other complex structures, the steel is required to significantly avoid toughness reduction due to strain aging caused by cold deformation. [0004] T...
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