High strength steel sheet and manufacturing method therefor
A technology of high-strength steel plate and manufacturing method, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of poor low temperature toughness and non-ductile transition temperature characteristics, unsuitable and other problems, and achieve the effect of excellent characteristics
Active Publication Date: 2020-08-21
浦项股份有限公司
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Problems solved by technology
However, although the steel plate in Patent Document 1 has a level of tensile strength that can be used as a steel plate for nuclear reactor containment, it has poor low-temperature toughness and nil-ductility temperature characteristics, and is not suitable as a material for nuclear reactor containment.
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[0092] Below by embodiment, the present invention is described in more detail. However, it should be noted that the following embodiments are only for the purpose of illustrating and further specifying the present invention, and are not intended to limit the scope of rights of the present invention.
[0093] Steel billets prepared with the alloy compositions shown in Table 1 below were produced.
[0094] 【Table 1】
[0095]
[0096]
[0097] Using each billet manufactured with the composition of the invention steel and the comparative steel described above, reheating, recrystallization controlled rolling, austenitizing heat treatment, rapid cooling, and tempering heat treatment were carried out under the conditions shown in Table 2 below, and test pieces were produced. Physical properties such as strength, low-temperature toughness, and nil-ductility transition temperature of each test piece were evaluated, and the results are shown in Table 3 below. In Table 3 below, t...
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Abstract
A high strength steel sheet according to an aspect of the present invention comprises, by weight %, 0.05-0.20% of C, 0.15-0.55% of Si, 0.9-1.75% of Mn, 0.001-0.05% of Al, 0.03% or less of P, 0.03% orless of S, 0.05-0.3% of Cr, 0.05-0.6% of Ni, 0.005-0.35% of Cu, 0.05-0.2% of Mo, 0.005-0.07% of V, 0.005-0.04% of Nb, 0.0005-0.005% of Ca, 0.005-0.025% of Ti, 0.002-0.006% of N, less than 0.0005% of B, the balance of Fe and inevitable impurities, with the proviso of satisfying the relation that Cu + Ni + Cr + Mo: 1.5% or less; Cr + Mo: 0.4% or less; V + Nb: 0.1% or less; and Ca / S: 1.0 or higher and may include a combined structure of tempered martensite and tempered bainite as a microstructure.
Description
technical field [0001] The present invention relates to a high-strength steel plate and a manufacturing method thereof. Specifically, it relates to a high-strength steel plate excellent in tensile strength and impact toughness, especially suitable for use in nuclear reactor containment vessels of nuclear power plants, and a manufacturing method thereof. Background technique [0002] Various materials are used for the materials constituting structures and equipment used in nuclear power plants depending on their type, application, safety, etc. In particular, steel is used as a material for a containment vessel of a nuclear reactor, and A516-70 steel produced by a normalizing heat treatment method using a thick steel plate material is mainly used. [0003] However, A516-70 steel exhibits a somewhat low tensile strength (500MPa level) in ensuring the safety of nuclear power plants, and thus its range of use is extremely limited. That is, because A516-70 steel has a slightly lo...
Claims
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IPC IPC(8): C22C38/42C22C38/44C22C38/46C22C38/48C22C38/00C22C38/50C21D8/02C21D9/46C21D1/18
CPCC21D1/18C21D9/46C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/001C22C38/02C22C38/04C22C38/06C21D8/0226C21D8/0263C21D2211/002C21D2211/008C22C38/002C21D8/0247C21D6/004C21D6/005C21D6/008C21D8/0205C22C38/58
Inventor 洪淳泽
Owner 浦项股份有限公司