11073 Compare the Corrosion Resistance of 3% CR Steel with API X65 Pipeline Steel

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Product Number: 51300-11073-SG

ISBN: 11073 2011 CP

Author: Lihua Hu, Lei Zhang, Wei Chang, Minxu Lu and Lining Xu

Publication Date: 2011

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Corrosion immersion tests of 3%Cr steel and API X65 pipeline steel were carried out in the high-pressure high-temperature autoclave, in order to simulate the typical corrosion environment of oil and gas transported pipeline. The effects of temperature and CO₂ partial pressure on corrosion behaviors were investigated, and the purpose of this paper was to compare the corrosion resistance of 3%Cr steel with API X65 pipeline steels in CO₂ corrosion environment.

The results show that, the corrosion of both 3%Cr steel and API X65 pipeline steel were slight in mild corrosion environment, so we could choose API X65 steel in these environment. With temperature or CO2 partial pressure increasing, the corrosion resistance of 3%Cr steel was superior to API X65 pipeline steel. The analysis of composition and morphology revealed that the corrosion product film of 3%Cr steel was composed of FeCO3, Cr(OH)3 and Cr2O3. An amorphous scale without grain boundaries and pores was formed on the surface of 3%Cr steel due to the Cr element enrichment, which offered considerable resistance to corrosive medium, therefore the corrosion rate was decreased and local corrosion was inhibited.

Keywords: 3%Cr steel, API X65 pipeline steel, temperature, CO₂ partial pressure, corrosion rate, corrosion product film