Thick steel plate having excellent low-temperature strain-aging impact properties and manufacturing method thereof

Abstract

The present invention relates to a thick steel plate excellent in low-temperature strain-aging impact properties and a manufacturing method thereof, and more particularly to a thick steel plate useful as a material in shipbuilding, marine structures, etc. and having excellent low-temperature strain-aging impact properties and a manufacturing method thereof. One embodiment of the present invention provides a thick steel plate having excellent low-temperature strain aging impact characteristics, and a method of manufacturing the same, the steel plate comprising by weight: 0.04% to 0.1% of C; 0.05% to 0.4% of Si; 1.0% 0.01% or less P; 0.003% or less S; 0.015% to 0.04% Al; 0.005% to 0.02% Ti; 0.35% or less (excluding 0) Cu 0.05% to 0.8% Ni; 0.003% to 0.03% Nb; 0.002% to 0.008% N; 0.0002% to 0.0050% Ca; 0.009% or less Cr; 0.0009% or less Mo; The balance is Fe and other unavoidable impurities, and its microstructure contains 95 area% or more of ferrite with an average grain size of 10 μm or less.

Description

Thick steel plate with excellent low temperature strain aging impact properties and method for producing the same technical field [0001] The present disclosure relates to a thick steel plate having excellent low temperature strain aging impact properties and a method of making the same, and more particularly It is additionally concerned with thick steels having excellent low temperature strain ageing impact properties which can be used as materials in shipbuilding, marine structures etc. Plate and method of making the same. Background technique [0002] Recently, mining areas have gradually moved to deep sea areas or cold areas due to the depletion of terrestrial or offshore energy resources. As a result, drilling, mining and storage facilities have become increasingly complex due to expansion, integration, etc. of facilities. steel used in Excellent low temperature toughness is required to ensure the stability of the structure, in particular, it is The decrease in ...

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 environment decreases to the level of the Arctic Ocean

Therefore, it is difficult to effectively prevent the decrease in toughness due to strain aging of steel by conventional methods

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