Thick steel plate having excellent low-temperature strain aging impact property and manufacturing method therefor

A technology of strain aging and impact characteristics, applied in the field of thick steel plate and its manufacturing, which can solve the problems of reduced toughness, increased cold deformation, and reduced use environment temperature, and achieves excellent yield strength and excellent low temperature strain aging. The effect of impact characteristics

Active Publication Date: 2020-06-02
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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

Method used

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  • Thick steel plate having excellent low-temperature strain aging impact property and manufacturing method therefor
  • Thick steel plate having excellent low-temperature strain aging impact property and manufacturing method therefor
  • Thick steel plate having excellent low-temperature strain aging impact property and manufacturing method therefor

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Embodiment approach

[0063] Hereinafter, the present disclosure will be described more specifically through examples. However, the following examples should be considered in a descriptive sense only and not for purposes of limitation. The scope of the invention is defined by the appended claims, and modifications and changes may be reasonably inferred therefrom.

[0064] (Example)

[0065] After preparing molten steel having the alloy composition shown in Table 1, a continuous casting operation was used to produce billets. The billets were reheated, hot rolled and cooled under the conditions shown in Table 2 to produce thick steel plates. After measuring the microstructure and mechanical properties of the thick steel plates thus prepared, the results are shown in Table 3 below.

[0066] [Table 1]

[0067]

[0068] [Table 2]

[0069]

[0070] [table 3]

[0071]

[0072] As can be seen from Tables 1 to 3, in the case of Examples 1 to 5 of the present invention satisfying the alloy com...

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Abstract

The present invention relates to a thick steel plate superior in low-temperature strain aging impact properties and a manufacturing method therefor and, more particularly, to a thick steel plate thatis usable as a material in ship building, marine structures, and the like and which has excellent low-temperature strain aging impact properties and a method for manufacturing the same. An embodimentof the present invention provides a thick steel plate having excellent low-temperature strain aging impact properties, the steel plate comprising, by weight: 0.04-0.1% of C; 0.05-0.4% of Si; 1.0-2.0%of Mn; 0.01% or less of P; 0.003% or less of S; 0.015-0.04% of Al; 0.005-0.02% of Ti; 0.35% or less (0 exclusive) of Cu; 0.05-0.8% of Ni; 0.003-0.03% of Nb; 0.002-0.008% of N; 0.0002-0.0050% of Ca; 0.009% or less of Cr; 0.0009% or less of Mo; and a balance of Fe and other inevitable impurities, with the microstructure thereof including 95% by area or greater of ferrite 10 um or less in average grain size, and a manufacturing method therefor.

Description

technical field [0001] The present disclosure relates to a thick steel plate having excellent low-temperature strain-aging impact properties and a method of manufacturing the same, and more particularly to a thick steel plate having excellent low-temperature strain-aging impact properties that can be used as a material in shipbuilding, marine structures, etc., and manufacturing thereof method. Background technique [0002] Recently, due to the depletion of land or offshore energy resources, mining areas have gradually moved to deep sea areas or cold areas. Consequently, drilling, mining, and storage facilities are becoming increasingly complex due to facility expansion, integration, and the like. Steel materials used therein need to have excellent low-temperature toughness to ensure structural stability, and in particular, need to minimize a decrease in toughness due to strain aging phenomenon or the like due to cold working during the fabrication of the structure. [0003...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/14C22C38/16C22C38/08C22C38/58
CPCC21D8/02C22C38/02C22C38/04C22C38/08C22C38/14C22C38/16C22C38/58C22C38/06C21D8/0226C22C38/001C21D8/0221C21D8/0273
Inventor 金佑谦严庆根房基铉
Owner 浦项股份有限公司
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