Corrosion and Mechanical Behavior of 300M Ultra-high Strength Steel in Typical Atmospheric Environment

SHE Jialiang; WANG Maochuan; LI Haoyu; XIONG Haolin; XU Long; SHE Zuxin

doi:10.7643/ issn.1672-9242.2025.09.018

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Equipment Environmental Engineering ›› 2025, Vol. 22 ›› Issue (9) : 170-176. DOI: 10.7643/ issn.1672-9242.2025.09.018

Environmental Test and Observation

Corrosion and Mechanical Behavior of 300M Ultra-high Strength Steel in Typical Atmospheric Environment

SHE Jialiang¹, WANG Maochuan², LI Haoyu^2,*, XIONG Haolin², XU Long¹, SHE Zuxin²

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Abstract

The work aims to study the effects of three typical atmospheric environments including hot and humid ocean, cold and low temperature as well as dry and hot desert, on the corrosion behavior of 300M ultra-high strength steel. The outdoor atmospheric exposure tests were carried out in Wanning, Dunhuang and Mohe. The corrosion variation of 300M high strength steel was studied by macroscopic corrosion morphology analysis, metallographic analysis and corrosion weight loss. The effect of corrosion behavior on the mechanical properties of 300M high strength steel was studied by tensile performance analysis and fatigue performance analysis. After one year of exposure test, the corrosion rate of 300M ultra-high strength steel was 115.9 μm/a, and the tensile strength and reduction of area decreased by 10.5% and 34.1%, respectively. The corrosion rates were 7.6 μm/a and 4.0 μm/a, respectively, and the tensile strength retention rates were 96.6% and 98.4%, respectively, in cold and low temperature atmospheric environment and dry and hot desert environment. Corrosion pits induced fatigue crack initiation and reduced fatigue life. After exposure to hot and humid marine atmospheric environment for 0.5 a, the median logarithmic fatigue life curve was S=-51.39×lgN_f+577.57. The corrosion effects of different atmospheric environments on 300M ultra-high strength steel are obviously different, and the corrosion sensitivity of hot and humid marine atmospheric environment is the highest. Corrosion leads to a decrease in the effective bearing area, which in turn reduces its tensile strength. The corrosion pits on the surface greatly affect its fatigue life, so effective corrosion protection measures should be taken during service.

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300M ultra-high strength steel / hot and humid ocean / cold and low temperature / dry and hot desert / corrosion / mechanical property

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SHE Jialiang, WANG Maochuan, LI Haoyu, XIONG Haolin, XU Long, SHE Zuxin. Corrosion and Mechanical Behavior of 300M Ultra-high Strength Steel in Typical Atmospheric Environment[J]. Equipment Environmental Engineering. 2025, 22(9): 170-176 https://doi.org/10.7643/ issn.1672-9242.2025.09.018

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