Effect of normalizing temperature on microstructure and mechanical properties of cryogenic pressure vessel steel plate

doi:10.13251/j.issn.0254-6051.2023.09.019

Abstract

Abstract: Effect of normalizing temperature on microstructure and mechanical properties of a cryogenic pressure vessel P355NL2 steel plate with the thickness of 10 mm was studied. The results show that compared with that of hot-rolled, after normalizing, the ferrite grain is refined, the banded structure is improved, the bainite structure in the core has no obvious change, the strength reduces, the elongation increases, and the impact property at -60 ℃ greatly improves. With the normalizing temperature increases, the ferrite grains become coarsened and equiaxed gradually, and the volume fraction of ferrite decreases, while there is no significant change in strength and elongation, though the low-temperature impact property first increases and then decreases. Taking into account the influence of normalizing temperature on the microstructure and properties, the P355NL2 steel plate can achieve excellent comprehensive mechanical properties by selecting a normalizing temperature of 880-910 ℃.

Key words: cryogenic vessel, P355NL2 steel plate, normalizing temperature, ferrite grain size, low temperature toughness

CLC Number:

TG142.1

Xie Zhanglong, Chen Jiahui, Zhang Bingjun, Chen Feng. Effect of normalizing temperature on microstructure and mechanical properties of cryogenic pressure vessel steel plate[J]. Heat Treatment of Metals, 2023, 48(9): 110-115.

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