We investigated several steels containing up to 5% chromium (Cr) with respect to their carbon dioxide ((C02) corrosion resistance in oil and gas environments. Steels containing 3% or more Cr showed improved corrosion performance compared to Cr free steels in a wet CO2 environment. This phenomenon was made clear by immersion tests, field tests and loop tests. Furthermore, we have developed a 3% Cr Electric Resistance Weld (ERW) linepipe steel with good Heat Affected Zone (HAZ) toughness in a simulated field weld using laboratory methods.
Keywords - carbon dioxide corrosion, 3% Cr linepipe steel, ERW, GTAW